PT8A2707 PERICOM | Alldatasheet
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Charger Controller with Fuel-Guage & LCD/LED Display 12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Product Features 2-3 cells, NiCd or NiMH battery fast-charger controller for battery-embedded devices Precise 7-bit fuel-gauge-counter measures charging and discharging current through battery pack. Make it possible to accurately indicate battery capacity through LCD (PT8A2707-09/2717-19) or LEDs (PT8A2710-12). Integrated with a DC/DC step-down controller make it possible for customers to manufacture just one PCB module that can: Cover different product models that requires different charging current/speed by changing only one resistor; Work with different kinds of AC/DC adapters with wide input voltage ranges. Motor also can work in both corded or cordless conditions. When motor is used in cord-mode, the charging current to battery is regulated at a maximum value of 1/10 of the fast-charging current. The battery is just like being slowly-charged and prevented from being exposed to a prolonged high-current charging profile. Provide excellent charge and discharge protections. Available with different parts to cover products employing slide switch (PT8A2707/10/17), tact switch (PT8A2708/09/11/12/18/19) input to control motor ON/OFF. Two-step motor-speed control (70%, 100%) is also available in PT8A2708/2711/2718. Very low standby current of typical 20A. Products could typically work in standby-mode for a few months, depends on battery capacity. Technology Highlights Employing 5 major charging states: cool-down / pre-charge / fast charge / trickle charge / stop charge, taking the best care for different battery conditions, especially for aged or dry batteries Excellent battery protection and full-charge detection schemes Negative delta voltage detection (-ΔV) with precision of +/-1mV step Maximum battery voltage detection to turn to maintenance Rate of change of temperature detection (dT/dt) best for NiMH batteries full-charge termination (use with NTC) Abnormal high battery temperature (55C) detection to stop charging (use with NTC) Flexible fast charge time-out setting (30mins/60mins/90mins/150mins) Fuel-gauge counter takes into account the battery self-discharge compensation based on time. Provide excellent battery over-discharge protection through auto-stop motor at once (<0.2s) when discharging current is higher than preset limit value for 3sec (3 limit values selectable externally) battery pack voltage is lower than No-Power value (adjustable externally) NTC measures battery pack temperature higher than preset high-temp value(adjustable externally) Key delay to reject multiple inputs at Tact switch (about 0.125s ignorance). Internal voltage regulator provides better rejection to interference. Integrated DC/DC step-down controller to regulate constant charging currents at different charging Available with 24-pin SOIC and SSOP lead-free package
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display
Description
The PT8A2707 -12/2717-19 integrates charger controller and fuel -gauge into a single -chip. It detects full -charge through -V, dT/dt, safety -timer and maximum battery voltage, and learns the battery capacity from each charging/discharging cycle. Since PT8A2707-12/2717-19 measures charge/discharge current to account for the battery capacity in/out respectively, the battery capacity can be accurately recorded and displayed in 6 -level (10%/20%/40%/60%/80%/100%) LED or LCD pattern. The continuous-learning capability enables the devices to take care of battery aging effect so that the capacity level is always accurately displayed throughout the life -span of the battery pack. In the charging control, a DC/DC controller is regulated to regulate constant currents for pre-charge, fast- charge and trickle-charge conditions. The charging current is determined by the value of a current -sense resistor such that it is tunable upo n different applications requirements. When motor is turned on during charging, the charge current to battery pack is regulated at 1/10 of the fast -charge current so that motor can draw current from the adapter while battery is charged in a safe and under -controlled condition. The PT8A2707-12/2717-19 employs NTC as the means to measure the batter y pack temperature. When a high temperature is measured during charging, the charging current will be cut off. The devices also detect NTC short/open at which all activities will be disabled if any one of these conditions is observed. Function comparison table Family members TACT Switch (ON/OFF) SLIDE Switch (ON/OFF) DSTACT Switch (ON(70%)/100% /OFF) LCD LED Motor Speed (70% PWM) LCD/LED display in idle mode PT8A2707 PT8A2708 PT8A2709 PT8A2710 PT8A2711 PT8A2712 PT8A2717 PT8A2718 PT8A2719
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Flow Chart IDLE PRE CHARGE MOTOR FAST CHARGE FULL CHARGE STOP CHARGE > 55C cord on/off motor on/off (2)(3)(4) Full Bat. (6) cord on/off (7) POWER UP (1) Notes: 1) The system goes to idle when it is power-up. The system is waked up when cord is plugged, motor is turned on or both. 2) Motor is turned on/off by tact switch or slide switch. 3) Motor will be turned off automatically when: a) the voltage of the battery pack is lower than 1.8V or (adjustable externally); b) the motor is drawing current more than the preset limit or (adjustable externally); c) the battery pack temperature is higher than 55C (adjustable externally) 4) During charging when motor is turned on, the charging current is regulated at 1/10 of the fast-charging current. When motor is turned off, the system will determine to go back to pre-charge/fast-charge/full-charge according to the battery usage condition (more details could be obtained in the operation description). 5) Enter fast-charging when a) battery temperature is less than 45C b) battery voltage is higher than 2V or after pre-charging for 3 minutes 6) Enter full-charge state when one of the following full-charge criteria is reached: a) safety timer timeout (4 external selections) b) max. voltage 3.4V (adjustable externally) c) -∆V d) dT/dt (adjustable by component selections) 7) If the battery pack is previously fully-charged without any usage or self-discharged enough, the charger goes directly to maintenance (trickle charge) when cord is plugged again. 8) Charger stops charging current when battery temperature is higher than 55C but resume for charging when battery temperature falls below 45C fast chg (5) 45C > 55C > 55C (8) (8) (8) motor on/off (2)(3)(4) motor on/off (2)(3) motor on/off (2)(3)(4) motor on/off (2)(3) 45C cord off cord off
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Pin Assignment and Description PT8A2707/17 pins assignment PT8A2708/18 pins assignment PT8A2709/19 pins assignment Table 1: PT8A2707-2709 and PT8A2717-2719 LCD Pattern Pin Description PIN I/O Name Descriptions
1 O CHARGE PWM DC/DC controller output for constant current regulation
2 I CORD External DC supply existence detection
3 I TEST Quick test mode
4 O BP BP for LCD back plane driver
5 O L100 Fuel gauge output (Remaining 100% capacity, full charge indication)
6 O L80 Fuel gauge output (Remaining 80% capacity)
7 O L60 Fuel gauge output (Remaining 60% capacity)
8 O L40 Fuel gauge output (Remaining 40% capacity)
9 O L20 Fuel gauge output (Remaining 20% capacity)
10 O BLI Battery-low output (Remaining <10% capacity)
12 I/O MOTOR Motor driver control
SLIDE Slide switch (PT8A2707/17) input to control motor running DSTACT Tact switch (PT8A2708/18) input to control motor running with dual speeds TACT Tact switch (PT8A2709/19) input to control motor running
14 I VB Charging battery voltage sense input
15 I VBLOW Low-battery voltage sense input
16 I VT Temperature sensor (NTC) input
17 O VEE Regulated output voltage
18 O TIMER Charging protection timer
20 I/O CC Compensation capacitor for DC/DC converter
21 I ISENCOM Current sense reference plane
22 I ISENFG Fuel gauge current sense input
23 I ISENDC DC/DC controller current sense input
24 I VMSTOP Motor stop current limit value
GND 4.2x charging current 0.6-1.0V 5x charging current VDD 3x charging current CHARGE BLI L20 L100 TEST L80 VBLOW ISENDC BP CORD PT8A2709/19 TIMER VEE 1 24 ISENCOM VDD L60 L40 ISENFG VMSTOP VT VB CC
13 TACT MOTOR
13 DSTACT MOTOR
13 SLIDE MOTOR
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display PT8A2710 pins assignment PT8A2711 pins assignment PT8A2712 pins assignment Table 2: PT8A2710-2712 LED Pattern Pin Description PIN I/O Name Descriptions
4 O L100 Fuel gauge output (Remaining 100% capacity, full charge indication)
5 O L80 Fuel gauge output (Remaining 80% capacity)
6 O L60 Fuel gauge output (Remaining 60% capacity)
7 O L40 Fuel gauge output (Remaining 40% capacity)
8 O L20 Fuel gauge output (Remaining 20% capacity)
9 O NA NA for PT8A2710/12
LTURBO Motor “Turbo-Mode” Indicator (PT8A2711)[Normal speed, OFF] SLIDE Slide switch (PT8A2710) input to control motor running DSTACT Tact switch (PT8A2711) input to control motor running with dual speeds TACT Tact switch (PT8A2712) input to control motor running 18 O TIMER Charging protection timer (1hr/1.5hrs/2.5hrs/4hrs) 19 - VDD Supply voltage GND 4.2x charging current 0.6-1.0V 5x charging current VDD 3x charging current CHARGE BLI NA L80 TEST L60 VBLOW ISENDC L100 CORD PT8A2710 TIMER VEE 1 24 ISENCOM VDD L40 L20 ISENFG VMSTOP VT VB CC
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Function description (refer to Flow Chart) 1. Battery Voltage Definitions: Table 3: Battery Voltage Definition Item General Setting Suggested Value Remark No-Power value 0.9V-1.0V/cell 1.8-2V for 2cells battery pack Adjustable externally, please refer to „application instruction‟ Battery-Low value 1.0V-1.1V/cell 2.0-2.2V for 2cells battery pack Max VB 1.65V-1.7V/cell 3.3-3.4V for 2cells battery pack 2. Charging Mechanism (cord is connected but motor is off) When a cord is detected, pre -charge begins. If the battery voltage is higher than Battery-Low threshold (usually set between 0.95V-1.1V/cell) and the battery pack temperature is less than 45 C, fast-charge starts. Otherwise, the battery will be kept in pre-charge status until its voltage is higher than the preset Battery-Low value or a 3 minutes time-out is reached to enter fast- charge mode. If battery temperature is found increasing to 55 C during pre-charge state, battery charging is stopped (DC/DC cuts power) to enter cool down state . Nevertheless, pre -charge will continue in any case until the battery temperatur e is cooled down below 45C. When entering fast -charge mode, if the battery voltage is below a preset voltage level (usually set at about 1.3V-1.4V/cell, measured with charging current ), a start -up timer is effective to avoid false triggering of -ΔV and d T/dt to have early fast - charge termination. During the start -up time, -ΔV and dT/dt detections are ignored but maximum temperature of 55 C will always be observed to stop fast -charge. The start -up timer is dependent to the external fast -charge time r setting as tabled below. The dT/dt data is valid for battery temperature in range of 35C to 55C. Table 4: Start-up Time Timer Tmax (User programmable externally) Start-up timer for inhibiting negative V and dT/dt measurement tmax/20 tmax (min) Start-up time (s) 30 90 60 180 90 270 150 450 Fast charge mode is terminated when any one of the following conditions meet: 1) Minus-delta-V Detection ( -V): The battery pack voltage is sampled by high precision A/D converter every 10s, with 0.5s sampling time. For each sampling interval (0.5s), the charging current is cut down. Averaging is performed on the collected data and the result is stored into registers after passing through high-order digital filter. The minus-delta-V is qualified when a voltage drop of about 5mV/cell from the maximum voltage recorded . The second minus -delta-V is qualified when a voltage drop of about 5mV/cell after the first minus -delta-V has been qualified. Every minus-delta-V happened, fuel-gauge increased one level up, and so and so until fuel-gauge is full. Table 5: Sample Description Bypass Start-up timer VB > 2.6V (measured by sampling) VB sampling period (tp) 10s VB sampling time 0.5s (fast-charging inhibition) BT sampling period (tp) 10s (time-multiplexing with VB sampling) 2) Maximum Battery Voltage Detection: When the averaged battery pack voltage reaches a preset maximum voltage limit (usually set about 1.6V-1.7V/cell) during the charging interval, fast-charge in terminated. 3) Battery Temperature Detection (Max. Temp and dT/dt): The PT8A2707-12/2717-19 employs thermistor(NTC) as battery temperature sensor. When the battery temperature reaches 55C, fast-charge is terminated and the battery will then go to cool down mode; or the rate of temperature change (dT/dt) reaches preset value, fast-charge is terminated and the battery will then be under trickle-charge mode at a rate of 1/10 of the fast -charge current. If NTC is not employed, the pin “VT” should be biased at an equivalent voltage as for 10C-20C or else the PT8A2707 -12/2717-19 determines the NTC is opened and will stop all charging activity forever. VB measurement BT measurement tp=0.5s
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 4) Fast-Charge Timer Cut -Off: The PT8A2707-12/2717-19 comes with 4 timer setting s (30mins/60mins/90mins /150mins) selectable externally throug h resistor divider. The fast -charge timer works as the last protection to prevent over -charging the battery if none of the above 3 terminations takes effect. In general, the timer is chosen according to the required time to fully- charge an empty battery wi th about 20 -30% margins . The timer can be easily calculated at a given charging current and battery capacity. 5) NTC Open or Short During battery charging, the PT8A2707-12/2717-19 always detects NTC status by measure VT voltage value. If NTC open/short is detected, all charging activities will be stopped and go to stop-charging mode. After fast-charge, the battery is charged at a rate of 1/10C to compensate for the self -discharge rate so as to maintain the battery capacity always at full as long as the cord is still connected. If the battery temperature continues to rise to 55C during maintenance, the PT8A2707-12/2717-19 will cut-off the charge current until the battery temperature reduces to below 5 5C to resume. After full-charge is detected, the PT8A2707-12/2717-19 will restore the full-charge status until it measures its capacity drops 5% of charge due to self -discharge (cord was removed) of battery or motor is turned on. During the time the PT8A2707-12/2717-19 keeps the full -charge status internally, if user detaches motor and plugs -in cord to charge the shaver again, the PT8A2707- 12/2717-19 will go to trickle-charge mode. 3. Discharging Mechanism (Motor is On while Cord is Not Connected) SLIDE, TACT and DSTACT are motor running control switch inputs. 1) SLIDE Switch Mode: PT8A2707/17/10 uses a pull high slide switch to control motor running through SLIDE pin. When slide switch is closed, the SLIDE pin is pulled high, and the motor is always turned on at 100% speed (full speed), else if slide switch is open, the motor is always turned off to stop motor running. 2) TACT Switch Mode: PT8A2709/19/12 uses a pull high tact switch to control motor running through TACT pin. With 1st pressing of TACT switch, the motor is always turned on at 100% speed (full speed), and with 2nd pressing of TACT switch, the motor is always turned off to stop motor running. When using TACT switch mode, the key delay for tact switches to reject multiple inputs are typically about 0.125s. 3) DSTACT Switch Mode: PT8A2708/18/11 uses a pull high tac t switch to control motor running with Dual Speed through DSTACT pin. With 1st pressing tact switch, the motor is turned on at 70% speed, with 2nd pressing of tact switch, the motor is turned to 100% speed (full speed) , and motor is turn off to stop runnin g with 3 rd pressing of tact switch. When using DSTACT switch mode, the key delay for tact switches to reject multiple inputs are typically about 0.125s. In above 3 models, battery over-discharge protection is available through auto-stop motor at once (<0.2s) when Battery discharging current is higher than preset current limit for 3sec (there are three limit values selectable refer to „motor- over-current protection settings‟) Battery pack voltage is lower than the preset No-Power limit value (typically about 0.9-1.0V per cell). NTC measures battery pack temperature higher than the preset limit (usually about 55-60C) The motor can be resumed when any of the above criteria is cleared. But for SLIDE switch model, user needs to turn off and turn on SLIDE switch to start motor again; for TACT and DSTACT switch models, the user needs to press the tact switch once to start motor. 4) Battery Low Alarm: The PT8A2707 -12/2717-19 detects battery capacity through output voltage level by VBLOW pin. When battery voltage is down to Battery-Low value (battery capacity is below 10%), Battery-Low alarm is alert, and controls Battery-Low LCD screen or LED (which is connected to BLI pin10) to remind user that battery is under low capacity condition. If battery voltage continues go d own and decreases to No -Power value, the motor will self shut down to protect battery be over discharged. The Battery-Low LCD segment and LED indications as below table. Table 6: Battery Alarm Conditions Item Condition Battery-Low LED Battery-Low LCD No cord Motor on on on Motor off blinking 5s on Cord is on Motor on on Motor off on 4. Cord is Connected While Motor is On When cord is connected while motor is on, or vice versa, there are two scenarios: 1) The motor is turned on and draws more current than the AC/DC adapter can supply: In all cases, the PT8A2707- 12/2717-19 will enable the external PMOSFET to fully turn on to supply maximum current to the motor. There are three sub - cases to observe:
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display a) If the motor is turned on during the pre -charge state, obviously there is no charging current to battery. The PT8A2707- 12/2717-19 will return to discharging mode while fuel -gauge is continuing to count the discharge amount. The discharging is stopped at the same criteria described in the Discharging Mechanism section. b) If the motor is turned on during the fast -charge state, the fast -charge safety timer is held. If the motor is turned on less than 5% of the battery maximum capacity , fast -charge resumes with fast -charge timer continu e to count (but start -up timer starts from beginning). However, when the motor is accumulatively turned on over 5% of the battery maximum capacity while cord is still connected, the fast -charge timer is cleared and the battery pack will be recharged from pre - charge state again once motor is off. c) If the motor is turned on during the trickle -charge state, if the motor is turned on to accumulatively consume less than 5% (not necessarily in single operation) of the battery maximum capacity , the PT8A2707-12/2717-19 resumes trickle- charge state. However, when the motor is turned on over 5% of the battery maximum capacity during the trickle-charge state, the battery pack will be recharged from pre-charge state again after motor is off. Besides, at any time when the battery pack voltage is lower th an the No-Power value or discharging current is higher than the preset limit levels for 3sec, the motor will be stopped and the devices return to charging status. 2) The motor is turned on but draws less current than the AC/DC adapter can supply: In all cases, when the battery is not discharged, the PT8A2707-12/2717-19 regulates a charging current of 1/10 of the fast -charge current to battery pack. In this case, the battery pack is under slow charging. Similarly, there are three more situations to observe: a) If the motor is turned on during the pre -charge state, once motor is turned off, the PT8A2707-12/2717-19 will resume back to the pre-charge state. b) If the motor is turned on during the fast -charge state, the fast -charge timer is held until motor is turned off to resume fast-charging. c) If the motor is turned on during the trikle-charge state, once motor is turned off, the PT8A2707-12/2717-19 will resume back to the maintenance state. In any charging states, if the battery temperature is measured higher than 55 C, the motor is stopped and the 0.1C charging current is cut off. The LED/LCD still displays as in “Charging Mode ”. The motor will draw current from battery pack until the battery temperature is below 55 C to resume 0.1C charging current. However, no matter whether it is in fast -charging or trickle-charging modes, when the motor is turned on to consume over 5% (accumulatively, not necessarily in single operation) of the battery maximum capacity during battery is over -temperature, the battery pack will be rec harged from pre-charge state again after motor is off. 5. Fuel-Gauge Counter 1) Charge Counting: Charge activity is detected based on positive voltage difference (VFUEL) between the pins ISENFG and ISENCOM. When voltage of I SENFG is higher than the voltage of I SENCOM, the PT8A2707 -12/2717-19 increments its fuel-gauge counter at a rate proportional to V FUEL. V FUEL is sampled and converted into digital data through high - precision A/D converter. When the fuel-gauge counter accumulates up to 99% level but none of th e full-charge criteria (-V, dT/dt, safety timer, maximum battery voltage) is detected, the fuel -gauge will wait at 99% level. Right after the battery is fully-charged, the PT8A2707-12/2717-19 displays full-charge and learns the capacity of the battery pac k such that the display will be more and more accurate in both charging and discharging cycles later. 2) Discharge Counting: Discharge activity is detected based on a negative voltage difference (V FUEL) between the pins ISENFG and ISENCOM. When voltage of I SENFG is lower than the voltage of I SENCOM, the PT8A2707 -12/2717-19 decrements its fuel -gauge counter at a rate proportional to V FUEL. V FUEL is sampled and converted into digital data through high -precision A/D converter. In case the fuel -gauge counter roll s to zero count while the battery voltage is still higher than the preset No -Power level, the Battery -Low LED is still flashing while user can still use motor. Motor will be stopped when battery voltage is below the No-Power level. The maximum fuel value is not updated, but will be updated when necessary for next time the battery is fully charged. The fuel value will be adjusted to 10% if the battery voltage gradually falls below Battery-Low threshold. 6. Idle Mode 1) Standby: When cord is not connected and mot or is off, the PT8A2707 -12/2717-19 turn to idle state to save power. Some internal circuits are shut-down to keep the standby power at about 20A. 2) Background Offset Cancellation: when the PT8A2707-12/2717-19 is waked up by user, an offset cancellation is p erformed for the internal precise A/D converter before entering cord or motor modes. It normally take s 0.2~0.3s. The PT8A2707 - 12/2717-19 returns to idle state after use.
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 7. First-Time Power-Up Initial Fuel Count & First -Time Charging: Upon power -up, the PT8A2707-12/2717-19 resets for all internal memory and resumes all default settings, the fuel -gauge counter will be initialized as zero count. The initialization may take a few seconds before PT8A2707-12/2717-19 boots up to operate normally. For the first-time charging, the fuel-gauge counter counts up to a default internal maximum fuel value (which is determined by the fast-charge timer selected externally. E.g. a 90mins timer means roughly it is a 1 -hour charger, the initial maximum fuel value is assumed for 1hr for 1C charging current. Similarly, a 150min timer is assumed for a 120mins for 0.5C charging current, etc.) measured by the external current sense resistor. Fuel -gauge LCD segments or LEDs are light up according to the initial maximum fuel valu e. The 100% fuel L CD segment (or LED) keeps on flashing even though the fuel -gauge count reaches the default maximum value. In this moment, the fuel -gauge counter learns the battery capacity by continuing to roll up its counter until fast - charging is completed. This new battery capacity is therefore memorized and used as the maximum value for next charging cycles. Similarly, if full -charge is detected earlier than the counter reaches its initial maximum fuel value, the maximum fuel value is updated but progressively. 8. Fuel-Gauge Display The PT8A2707/08/09/17/18/19 use LCD screen for the fuel gauge display and PT8A2710/11/ 12 use LEDs for fuel gauge display . For both LCD screen and LED models, there are 3 different display modes: Charging Mode, Discharging Mode and Idle Mode, as described in LED/LCD pattern section in pages 12-13. 1) Charging Mode: a) Cord Mode with Motor off: When cord is connected, the fuel gauge display is turned on to “Charging Mode ”. As soon as cord is removed, the fuel -gauge LED display continues to display the fuel gauge level according to the “Discharging Mode” for 5s. b) Motor-On Mode with Cord: When motor is turned on while cord is plugged in, or vice versa, the PT8A2707-12/2717-19 displays fuel-gauge with accordance to the actual charge or di scharge amount. The fuel -gauge always displays in the “Charging Mode” no matter whether there is net current charging into the battery or not. If the motor is drawing less current than the adapter can supply, the DC/DC converter will regulate the battery c harging current at a slow -rate (1/10 of the fast charge current). The high-precision ADC in PT8A2707-12/2717-19 is still to calculate this small charging current to add into the fuel-gauge counter. 2) Discharging Mode: a) Motor-On Mode without Cord: When motor is turned on while no cord is connected, the fuel gauge is displayed continuously in the “Discharging Mode”. After motor is turned off, the fuel-gauge display will still continue to display for 5 seconds. b) Motor-On Mode with Cord: The fuel-gauge always displays in the "Charging Mode" no matter whether there is net current charging into the battery or not. If the motor is drawing more current than the adapter can supply, there will be some amount of current being drawn from the battery pack. The high-precision ADC in PT8A2707 -12/2717-19 is still capable to calculate this small discharging current to subtract from the fuel-gauge counter. 3) Idle Mode: LED display will be OFF in idle state. For LCD mode, the display of PT8A2707/ 08/ 09 will be continued on until bat tery has no power; but the display of PT8A2717/18/19 will be off.
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display LCD output specification Table 7: LCD Specifications Pin Signal Format BP 64Hz 50% Duty Cycle Square-wave Output Signal Generated from the 32kHz Master Clock L100, L80, L60, L40 OFF: In-phase with Back Plane Signal ON: 180 Out-of-phase with Back Plane Signal 2Hz-FLASH: Blinking at 2Hz During Charging Mode. Switch between In -phase and Out-of-Phase Output Signal at 2Hz L20 OFF: In-phase with Back Plane Signal ON: 180 Out-of-phase with Back Plane Signal 2Hz-FLASH: Blinking at 2Hz During Charging Mode. Switch between In -phase and Out-of-Phase Output Signal at 2Hz 1Hz-FLASH: Blinking at 1Hz During Discharging Mode. Switch between In -phase and Out-of-Phase Output Signal at 1Hz BLI OFF: In-phase with Back Plane Signal ON: 180 Out-of-phase with Back Plane Signal Figure 1: LCD Signal Phase vs BP Signal Phase for all states BP SIGNAL ON OFF FLASH
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display LED/LCD Patterns Summary Figure 2: LCD and LED Display (100) (80) (60) (40) (20) (BLI) 100-99 100-98 LED monitor display LCD and LED Display Indication LED is OFF LED is ON LED is flashing at 2 Hz Percentage of battery charge Charge mode Percentage of battery charge Discharge mode BLI LCD is ON, blinking at 2 Hz during charging LCD is ON Blinking at 1Hz during discharging BLI 0-10 11-20 21-40 41-60 61-80 100 81-98 100
100 Percentage of Battery Charge
Percentage of Battery Charge Discharge mode BLI BLI BLI BLI BLI BLI (100) (80) (60) (40) (20) (BLI) 99-100 (100) (80) (60) (40) (20) (BLI) 81-98 (100) (80) (60) (40) (20) (BLI) 61-80 (100) (80) (60) (40) (20) (BLI) 41-60 (100) (80) (60) (40) (20) (BLI) 21-40 (100) (80) (60) (40) (20) (BLI) 11-20 (100) (80) (60) (40) (20) (BLI) 0-10 (100) (80) (60) (40) (20) (BLI) 60-41 (100) (80) (60) (40) (20) (BLI) 80-61 (100) (80) (60) (40) (20) (BLI) 40-21 (100) (80) (60) (40) (20) (BLI) 20-11 (100) (80) (60) (40) (20) (BLI) 10-0 (100) (80) (60) (40) (20) (BLI) 98-81
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Test Mode Specification VT = 0.75V (25oC) Table 8: for Test Mode INPUT Explanation Output State Timer VT Duration For tester test charge BLI L100 motor 0 62.5msec 1 0V 0.75V 62.5msec (Isendc-Isencom) regulate 7mV 1 1 1 0 2 0V 0.75V 62.5msec (Isendc-Isencom) regulate 70mV 1 1 1 0 3 0V 0.75V 62.5msec All LEDs turn on 0 0 0 0 4 0V 0.75V 62.5msec MOTOR outputs 100Hz 50% duty cycle 0 1 1 50% PWM @ 100Hz 5 0V 0.75V 62.5msec BLI turns on if NTC short or open; otherwise L100 turns on 0 1 0 0 6 0V 0.75V 62.5msec L100, BLI output refer to timer setting 0 1 1 0 7 62.5msec 0 1sec For manual test 1 0V 0.75V 1sec (Isendc-Isencom) regulate 7mV 1 1 1 0 2 0V 0.75V 1sec (Isendc-Isencom) regulate 70mV 1 1 1 0 3 0V 0.75V 1sec All LEDs turn on 0 0 0 0 4 0V 0.75V 1sec MOTOR outputs 100Hz 50% duty cycle 0 1 1 50% PWM @ 100Hz 5 0V 0.75V 1sec BLI turns on if NTC short or open; otherwise L100 turns on 0 1 0 0 6 0V 0.75V 1sec L100, BLI output refer to timer setting 0 1 1 0 7 1sec
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Maximum Ratings Recommended operation conditions Symbol Description Min Type Max Unit VCC Operating Voltage 1.8 3.0 5.5 V VIH “H” Input Voltage 0.7VCC - - V VIL “L” Input Voltage - - 0.3VCC V TA Operating temperature -10 25 70 °C
Electrical Characteristics
(Unless otherwise noted, TA = -10~70° C, VCC=3.0V) Symbol Parameter Test Conditions Min Typ Max Unit VEE Regulator Output Voltage IOUT = 1mA 1.6 1.65 1.7 V VEE Line regulation 1.8VCC5.5V, No load - 40 50 mV VLDR VEE Load regulation 0mA IL1mA - 3 10 mV VIL Input Low Threshold for all digital input - - - 0.90 V VIH Input High Threshold for all digital input - 2.1 - - V IIH Input leakage current for SLIDE TACT and Turbo pins - 20 30 100 A IIL - - - -1 IADC ADC Input Current (VB, VT) - -1 - 1 A CTMAX Fast-Charge Timer Input voltage Range 90mins - - 0 0.165 V 60mins - 0.36 - 0.46 30mins - 1.19 - 1.29 150mins - 1.70 - VCHARGE Internal reference for DC-DC output current Pre-charge mode and trickle charge mode (1/10CC) - 4 7 9 mV Fast charge mode (1CC) - 50 70 90 VDISMAX Internal reference for discharging protection VVMSTOP= GND -240 -300 -360 VVMSTOP=0.6-1.0V -280 -350 -420 VVMSTOP= VCC -168 -210 -252 DMOTOR Duty cycle of Motor driver output for controlling motor speed High speed - - 100% - - Low speed - 78% 80% 82% FT Motor frequency for TE trimming - 90 100 110 Hz FMOTOR PWM signal frequency for motor driver output - 90 100 140 Hz tDLY TACT and DSTACT tact switches delay time to active - - 125 150 ms IOL1 Output Sink Current (L100, L80, L60, L40, L20, BLI or LMON or LTURBO) VCC =2.4V ,VOL1=0.4V 6 8 - mA To be continued. Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other condi - tions above those indicated in the o perational sec - tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Continued. Symbol Parameter Test Conditions Min Typ Max Unit IOH2 Output Source Current (MOTOR) VCC =1.8V , VOH2=1.2V -10 -13 mA VCC =3.0V , VOH2=1.2V -13 -18 IOL2 Output Sink Current (MOTOR) VCC =3.0V ,VOL2=0.3V 0.5 2.5 - mA IOH3 Output Source Current (CHARGE) VCC =2.4V , VOH3=1.2V -5 -10 - mA VCC =3.0V , VOH2=1.2V -5 -15 IOL3 Output Sink Current (CHARGE) VCC =3.0V ,VOL3=0.3V 2 4 - mA IOH4 Output Source Current (CC pin) VCC =3.0V , VOH4=2.7V -10 -25 -50 A IOL4 Output Sink Current (CC pin) VCC =3.0V ,VOL4=0.3V 0.5 0.8 2 A IOH5 Output Source Current for BP VCC=3.0V, VOH5=2.7V 200 500 - A IOL5 Output Sink Current for BP VCC=3.0V, VOL5=0.3V 200 550 - A ICCQ Operation Current VCC=3.0V - 2.6 5 mA IS Standby Current Cord=0, Motor=0 - - 30 A -V Minus Delta Voltage to Terminate Fast- Charge detected by VB pin (per cell) - 4 5 7 mV VBMAX Internal reference voltage for Maximum Battery Voltage Protection - 1.95 2.00 2.08 V VBLOW Internal reference voltage for Low Battery - 1.6 1.65 1.7 V VBSTOP Internal reference voltage for No Power to Stop Motor - 1.40 1.45 1.50 V VCORD Threshold voltage for Cord on /off - 0.55 0.60 0.65 V FOSC Frequency of Internal Oscillator - 29 32 35 kHz ΔVT VT voltage change value for dT/dt protection CTMAX=90mins, Measure 90s 13.5 15 16.5 mV CTMAX=60mins, Measure 60s CTMAX=30mins, Measure 30s CTMAX=150mins, Measure 150s VTMAX VT voltage for Maximum Battery Temperature 55C or NTC short - 0.355 0.375 0.395 V VTNTCO VT voltage for NTC open - 1.05 1.10 1.15 V
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Application Circuit 1) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2707/ 17 (SLIDE Switch Model with LCD display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8
1 N58 1 7
7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C
1 N41 4 8
1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F VB LO W VB R1 5 1 00 K VB VB LO W VB AT VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) LC D DIS PLAY CHARGE1 CORD2 TEST3 BP4 L1005 L806 L607 L408 L209 BLI10 GND11 MOTOR12 SLIDE 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 VM STOP 24 IC 1 PT 8A2 70 7 /2 71 7 C 1 1 0 .1 u F C 1 2 0 .1 u F VB AT D5 1 N58 1 7 No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 3: PT8A2707/17 LCD Display SLIDE Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 2) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2708/18 (DSTACT Switch Model with LCD display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8 7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C 1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F R1 5 1 00 K VB VB LO W VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) LC D DIS PLAY C 1 1 0 .1 u F VB AT D5 1 N58 1 7 VB LO W VB VB AT VM STOP 24CHARGE1 CORD2 TEST3 BP4 L1005 L806 L607 L408 L209 BLI10 GND11 MOTOR12 DSTACT 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 IC 1 PT 8A2 70 8 /2 71 8 C 1 2 0 .1 u F No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 4: PT8A2708/18 LCD Display Dual-speed DSTACT Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 3) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2709/19 (TACT Switch Model with LCD display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8 7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C 1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F R1 5 1 00 K VB VB LO W VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) LC D DIS PLAY C 1 1 0 .1 u F VB AT D5 1 N58 1 7 VB LO W VB VB AT CHARGE1 CORD2 TEST3 BP4 L1005 L806 L607 L408 L209 BLI10 GND11 MOTOR12 TACT 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 VM STOP 24 IC 1 PT 8A2 70 9 /2 71 9 C 1 2 0 .1 u F No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 5: PT8A2709/19 LCD Display TACT Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 4) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2710 (SLIDE Switch Model with LED display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8 7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C 1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F VB LO W VB R1 5 1 00 K VB VB LO W VB AT VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) C 1 1 0 .1 u F VB AT D5 1 N58 1 7 LED2 8 0% LED4 4 0% LED5 2 0% LED6 Mo to r o n LED1 1 00 % LED3 6 0% LED7 B LI CHARGE1 CORD2 TEST3 L1004 L805 L606 L407 L208 LMON9 BLI10 GND11 MOTOR12 SLIDE 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 VM STOP 24 IC 1 PT 8A2 71 0 VDC C 1 2 0 .1 u F No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 6: PT8A2710 LED Display SLIDE Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 5) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2711 (DSTACT Switch Model LED display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8 7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C 1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F VB LO W VB R1 5 1 00 K VB VB LO W VB AT VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) C 1 1 0 .1 u F VB AT D5 1 N58 1 7 LED2 8 0% LED4 4 0% LED5 2 0% LED6 Mo to r o n LED1 1 00 % LED3 6 0% LED7 B LI VDC CHARGE1 CORD2 TEST3 L1004 L805 L606 L407 L208 LTURBO9 BLI10 GND11 MOTOR12 DSTACT 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 VM STOP 24 IC 1 PT 8A2 71 1 C 1 2 0 .1 u F No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 7: PT8A2711 LED Display Dual-speed DSTACT Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 6) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2712 (TACT Switch Model with LED display) AC/DC Adapter: 4V 650mA, Battery Capacity: 650-730mAh, Safety charge timer: 1.5hrs AC/DC Adapter 4V 650mA 1 00 u F DC GND 2 0k 2 40 R6 68 B 7 72 D1 1 N41 4 8 7 .5 K 0.1Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K 1 0u F R1 2 1 80 K 1 u F B a ttery R1 6NT C 1 00 K @ 2 5℃ 2 .4 V, 65 0 m AH 1 0u F M MB T 2 2 2 2 A VB AT R1 3 3 3K R1 4 3 6K 1 u F VB LO W VB R1 5 1 00 K VB VB LO W VB AT VB AT VDC 3 30 1 u F D4 1 N4 1 48 R1 7 1 00 R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u fa ctu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.69 V (fo r B atte ry-Low VB AT =2 .1 V) S e t VB LO W =1.45 V (fo r No-Powe r VB AT=1 .8V) C 1 1 0 .1 u F VB AT D5 1 N58 1 7 LED2 8 0% LED4 4 0% LED5 2 0% LED6 Mo to r o n LED1 1 00 % LED3 6 0% LED7 B LI VDC CHARGE1 CORD2 TEST3 L1004 L805 L606 L407 L208 LMON9 BLI10 GND11 MOTOR12 TACT 13 VB 14 VBLOW 15 VT 16 VEE 17 TIM ER 18 VDD 19 CC 20 ISENCOM 21 ISENFG 22 ISENDC 23 VM STOP 24 IC 1 PT 8A2 71 2 C 1 2 0 .1 u F No te : C 1 1 an d C 1 2 a re u se d fo r i m pro vin g s ys te m sta bi li ty ,n ot i nte gra n t fo r who l e sy s te m Figure 8: PT8A2712 LED Display TACT Switch Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display 7) Typical 2-Cell 1-hr 1.4A Fast-Charge Application Circuit for PT8A2711 (DSTACT Switch Model LED display) AC/DC Adapter: 4.5V 1500mA, Battery Capacity: 1300mAh, Safety charge timer: 1.5hrs AC /DC Adapter 4 .5 V 1 0 0 0m A 1 00 u F DC GND 2 0k 4 30 R6 6 8o h m D1 1 N41 4 8 4 7u H/1 .5 AR1 2 4K 7 .5 K 0.068Ω,1%,1/8W 3 3k 3 3k 1 u F 1 u F C7 1 u F R1 1 7 5K C6 1 0u F R1 2 1 80 K 1 u F B attery R1 6NT C
1 N40 0 7
1 00 K@ 2 5℃ 2 .4 V, 13 0 0m AH 1 0u F M MB T22 2 2 A VB AT R1 3 4 3K R1 4 2 2K 1 u F VB LO W VB R1 5 1 00 K VB VB LO W VB AT VB AT VDC 3 30 1 u F R1 8 2 20 K 2J1 R1 9 4 7K VB AT Pu ll -u p to VB AT to en ter m an u factu rin g te s t m o de S e t VB =2 .0 V(fo r Ma x VB AT =3 .4 V) S e t VB LO W =1.6 9V (fo r B atte ry-Lo w VB AT=2 .1 V) S e t VB LO W =1.4 5V (fo r No-Powe r VB AT=1.8V) LED2 8 0% LED4 4 0% LED5 2 0% LED6 Du al Sp eed LED1 1 00 % LED3 6 0% LED7 B LI CHARGE1 CORD2 T EST3 L 1004 L 805 L 606 L 407 L 208 L TURBO9 BL I10 GND11 MOTOR12 DSTACT 13 VB 14 VBLOW 15 VT 16 VE E 17 T IM ER 18 VDD 19 CC 20 ISE NCOM 21 ISE NFG 22 ISE NDC 23 VM ST OP 24 IC 1 PT 8A2 71 1 VDC Q1 AO 6 4 09 R2 0 8 20 D5 1 N58 1 7 AO 3 4 16 R1 0 1 0K C 1 1 0 .1 u F C 1 2 0 .1 u F Figure 9: PT8A2711 1.4A fast-charge Application Circuit
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Application instruction 1. Self-Discharge Calibration During the idle state, the self -discharge rate of batteries is calibrated in the fuel -gauge counter. The self-discharge calibration rate is fixed at 1/128C per day, which corresponds to the NiMH battery characteristics at which the battery pack will be completely self-charged to zero in about 4 months in a storage temperature of about 20-35C. 2. Setting Battery Temperature Measurement The PT8A2707-12/2717-19 employs a thermistor with negative temperature coefficient to measure the battery‟s temperature. Since most thermistors are inherently nonlinear with respect to temperature, in order to reduce the effect of nonlinearity, a resistor-divider network in parallel with the thermistor is recommended. A typical application circuit is shown on the right side. The resistor-divider consists of RX and RY, which can be selected to adjust the peak temperature threshold (e.g. 55C) as well as dT/dt slope according to the characteristics of the employed thermistors. (The calculation methods will be provided in datasheet later) Figure 10 3. Setting Charging Current The PT8A2707-12/2717-19 employs two internal references for DC/DC bulk converter to achieve constant current charging disregards to the input power supply voltages. For fast -charging, an internal reference volt age of 70mV is employed to compare with the voltage drop across the sensing resistor. For pre -charging or maintenance trickle -charging, an internal reference voltage of 7mV is employed to compare the voltage drop across the sensing resistor to achieve 1/10 of the fast -charging current. For example, when controlling a 700mA charging control, a 0.10 1/8W sensing resistor is required. When it is in the pre -charging or trickle-charge status, the current is controlled at 70mA (This is already excluding the additional current that may flow from the adapter to LCD screen or LEDs or even to the motor when loaded unless motor is drawing all current from adapter). When a higher charging current would be used for 1 -hr charging for a higher capacity battery, the sensin g resistor should be scaled proportionally to maintain the same reference voltages. For examples: Table 9: Charge Sensing Resistor Selection Charging Current Pre-Charging & Maintenance Current Sensing Resistor 700mA 70mA 0.10, 1/8W 1.03A 100mA 0.068, 1/8W 1.3A 130mA 0.054, 1/8W 1.6A 160mA 0.044, 1/8W Basically, the sense resistor is inversely proportional to the charging current. The power dissipation is maintained at about 0.07W. 4. Setting dT/dt value to stop fast-charge The PT8A2707-12/2717-19 employs thermistor (NTC) as battery temperature sensor. When the rate of temperature change (dT/dt) reaches certain value, fast-charge is terminated. When design external NTC sampling circuit, user should consider that appropriate dT/dt value is depended on fast charge time and battery type. Table 16 shows the dT/dt value for different fast charge time. Suggested NTC sampling circuit is based on this table and dT/dt characteristics of the devices. Table 10: Rate of Temperature Change (dT/dt) to Terminate Fast-Charge Fast charge time and measure time dT/dt TFCMAX =90mins, Measure 90s 0.9C/min TFCMAX =60mins, Measure 60s 1.38C/min TFCMAX =30mins, Measure 30s 2.76C/min TFCMAX =150mins, Measure 150s 0.54C/min 5. Setting Motor-Over-Current Protection Threshold By setting the VMSTOP pin, three motor-over-current voltage thresholds can be selected as follows: Table 11: Motor-Over-Current Setting VMSTOP Over-Current Reference Voltage GND 300mV across sensing resistor 0.6-1.0V 350mV across sensing resistor VDD 210mV across sensing resistor RY RX NTC VT VEE
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Table 12: Design Reference for Current Limit Charging Current Sensing Resistor VMSTOP Setting Motor-over-current limit 700mA 0.10, 1/8W GND 3.0A (300mV/0.1Ω) VDD 2.1A (210mV/0.1Ω) 1A 68m, 1/8W GND 4.4A (300mV/0.068Ω) VDD 3A (210mV/0.068Ω) 1.6A 44m, 1/8W GND 6.8A (300mV/0.044Ω) 0.6-1.0V 8A (350mV/0.044Ω VDD 4.8A (210mV/0.044Ω)) 6. Setting Maximum Battery Protection and Low-Battery Detection Thresholds The ratio of RA: (RB+RC) sets the maximum battery detection and -△V detection window (+/-0.3V). The ratio of (RA+RB): RC sets the Battery-Low detection threshold. VB and VBLOW contain individual comparators with fixed internal reference. VB internal comparator reference voltage 2.0V (VMB comparator works when VBAT is above 2.4V) VBLOW internal comparator reference voltage 1.45V (No-Power threshold) VBLOW internal comparator second reference voltage 1.65V (Battery-Low threshold) -V detection reference voltage range at VB = 1.5V to 2.1V CBA C MB CBA CB BL RRR RVV RRR RRVV 0.2 45.1 Figure 11 Example #1: No-Power threshold =VBL=1.8V, Maximum Battery Voltage=VMB=3.4V Assuming RC=100kΩ, RA and RB can be calculated as follows: RB= 36kΩ, RA=33kΩ In this setting, -ΔV is measured for battery voltage from 2.55V to 3.58V. (The internal ADC measures -8mV such that at the 2-cell battery pack the actual -ΔV is 10mV (i.e. -5mV/cell). For the Batttery-Low threshold, it will be about 2.0V Example #2: No-Power threshold =VBL=2.0V, Maximum Battery Voltage=VMB=3.5V Assuming RC=100kΩ, RA and RB can be calculated as follows: RB= 27kΩ, RA=48kΩ In this setting, -ΔV is measured for battery voltage from 2.625V to 3.675V. (The internal ADC measures -8mV such that at the 2- cell battery pack the actual -ΔV is 10mV (i.e. -5mV/cell). For the Battery-Low threshold, it will be about 2.25V Example #3: No-power threshold=VBL=2.7V (0.9V/cell), Maximum Battery Voltage=VMB=5.1V (1.7V/cell) Assuming RC=100kΩ, RA and RB can be calculated as follows: RB= 36kΩ, RA=118kΩ In this setting, -ΔV is measured for battery voltage from 3.85V to 5.35V. (The internal ADC measures -8mV such that at the 3- cell battery pack the actual -ΔV is 15mV (i.e. -5mV/cell). For the Battery-Low threshold, it will be about 3.3V RB RA VB VBAT RC VBLOW
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display Mechanical Information SE (Lead free SOIC-24) SYMBOL MIN MAX A 2.35 2.65 A1 0.10 0.30 A2 2.10 2.50 b 0.33 0.51 c 0.20 0.33 D 15.20 15.60 E 7.40 7.60 E1 10.21 10.61 e L 0.40 1.27 θ 0° 8° PKG. DIMENSIONS(MM)
1.27 BSC
Note: 1) Controlling dimensions in millimeters. 2) Ref: JEDEC MS-013E/AD DENOTES DIMENSIONS
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display HE (Lead free SSOP-24) SYMBOL MIN MAX A 1.73 A1 0.05 0.23 A2 1.40 1.60 b 0.22 0.38 c 0.09 0.25 D 8.00 8.40 E 5.10 5.50 E1 7.60 8.00 e L 0.55 0.95 θ 0° 8° N PKG. DIMENSIONS(MM)
0.65 BSC
Note: 1) Ref: JEDEC MO-150B/AG 2) N=Number of pins
12-07-0005 PT0268-1 07/05/12 PT8A2707-12/17-19 Charger Controller with Fuel-Guage & LCD/LED Display
Ordering Information
Part No. Package Code Package PT8A2707SE* S Lead free and Green 24-pin SOIC PT8A2708SE* S Lead free and Green 24-pin SOIC PT8A2709SE* S Lead free and Green 24-pin SOIC PT8A2710SE* S Lead free and Green 24-pin SOIC PT8A2711SE* S Lead free and Green 24-pin SOIC PT8A2712SE S Lead free and Green 24-pin SOIC PT8A2717SE* S Lead free and Green 24-pin SOIC PT8A2718SE* S Lead free and Green 24-pin SOIC PT8A2719SE* S Lead free and Green 24-pin SOIC PT8A2707HE* H Lead free and Green 24-pin SSOP PT8A2708HE* H Lead free and Green 24-pin SSOP PT8A2709HE* H Lead free and Green 24-pin SSOP PT8A2710HE* H Lead free and Green 24-pin SSOP PT8A2711HE* H Lead free and Green 24-pin SSOP PT8A2712HE H Lead free and Green 24-pin SSOP PT8A2717HE* H Lead free and Green 24-pin SSOP PT8A2718HE* H Lead free and Green 24-pin SSOP PT8A2719HE H Lead free and Green 24-pin SSOP Note: E = Pb-free and Green Adding X Suffix= Tape/Reel *Contact Pericom for availability. Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.