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Figure 1. AP4305 Block Diagram
Figure 2. AP4305 Pin Layout (Top View)
[AP4305] Rev 0.5.0 4 Chart 1. Pin Description PIN Location Pin Name Type (Note 1) I/O (Note 2) Function Remark D1, E1 VUSB PWR － USB Power Supply Pin D2 CP A － Charge Pump Capacitor Pin D5 INTB D O Interrupt Output Pin (Open drain) C2 VRDYB D O Battery Ready Detection Output Pin (Open drain) A3 SCL D I I2C Bus Clock Input Pin A4 SDA D IO I2C Bus Data I/O Pin B2 ILIM_SEL D I USB Current Limit Setting Input Pin High: 100mA Low: 500mA ILIM_SEL has no effect on the input current limit while I register control mode. Internally pull-up A5 LED D O LED Driver/ Status Output Pin ON (Low): Charging in progress OFF (High): End of charging Blinking: Charge mode faults B1 GND GND － Ground Pin A2 TREF A O NTC Thermistor Bias Voltage Pin A1 TEMP A I Battery Temp. Detector Connection Pin B4, B5 BAT A O Battery Charge Current Output Pin C4, C5 VOUT PWR IO DC/DC Output Pin D4, E4 PGND GND － Ground Pin D3, E3 SW A － Inductor Connection Pin E5 BT A － Bootstrap Pin C3 CHG_ENB D I Charge enable pin Low: Enable charging （CHGEN bit is available） High: Disable charging（CHGEN bit is ignored） Internally pull-down C1 VR PWR － Internal Reference Voltage Pin B3 TEST D － TEST Pin ( connect to GND) Internally pull-down (Note 1) A: Analog Pin, D: Digital Pin, GND: Ground Pin, PWR: Power Pin (Note 2) I: Input Pin, O: Output Pin, IO: Input and Output Pin Pin Description CONFIDENTIAL
[AP4305] Rev 0.5.0 5 Chart 2. Absolute Maximum Ratings Ta = 25C, unless otherwise noted. Parameter Symbol Min Max Pin Remarks Unit Pin Voltage V USB VBT -0.3 20.0 VUSB BT V VSW VVIN -0.3 12.0 SW CP VINTB VSCL VSDA VILIM_SEL VLED VVOUT VBAT VVRDYB VVR VCHG ENB -0.3 5.5 INTB SCL SDA ILIM_SEL LED VOUT BAT VRDYB VR CHG_ENB VTREF VTEMP -0.3 1.98 TREF TEMP Junction Temperature Tj 150 - ℃ Storage Temperature Tstg -40 150 - ℃ Power Dissipation Pd 1700 - (Note) mW Note: Based on a soldered package on a board of 76.2ｘ76.2mm, t=1.6mm,FR4, four layers. Chart 3. Recommended Operating Conditions Ta = 25°C, unless otherwise noted Parameter Symbol Conditions Min Typ Max Unit Supply Voltage VUSB 4.1 (Note) - 6.0 V Operating Temperature Ta -30 - 85 C (Note) Minimum voltage for start-up. VUSB more than Vcv+ 0.55V is necessary to get a fast charge current according to setting during charge in the range that does not exceed an input current limit level. Absolute Maximum Ratings Recommended Operating Conditions CONFIDENTIAL
[AP4305] Rev 0.5.0 6 Chart 4. Electrical Characteristics Ta = 25°C, VUSB = 5.0V, unless otherwise noted. Parameter Symbol Conditions Min Typ Max Unit USB Power Supply VUSB Supply current IVUSB No switching operation (VUSB=5V） 400 μA VUSB Input Current Limit I USBSET 100mA setting 150mA setting 500mA setting 800mA setting 900mA setting 1500mA setting 1800mA setting 120 450 720 810 1350 1620 135 475 760 855 1425 1710 100 150 500 800 900 1500 1800 mA VUSB Connection Detect Voltage VUVLO Rising Threshold Hysteresis 3.55 100 3.90 200 4.20 300 V mV VUSB Over Voltage Protection Detect Voltage VOVP Rising Threshold Hysteresis 6.05 100 6.5 200 6.95 300 V mV VUSB Low Voltage Detect Voltage (Automatic current limit threshold) V LVD Falling Threshold Hysteresis 4.05 4.30 4.55 V Step-Down DC/DC Converter On Resistance at Top side R ONT Between VUSB-SW pin IUSBSET=1500mA setting 300 mΩ On Resistance at Bottom side R ONB Between SW-PGND pin 300 m Ω Switching Frequency fOSC 3 MHz Cycle by Cycle Current Limit C ILIM IILIM ≥ 500mA 2.4 3.5 4.6 A IILIM ≤ 150mA 0.7 1.0 1.3 A VOUT Output Voltage 1 VVOUT1 3.0V < VBAT < 3.6V VO_MIN bit = 0 VO_MIN bit = 1 3.45 3.60 VBAT+VOFS 3.85 V VOUT Output Voltage 2 VVOUT2 Stopped Charge or Trickle Charge VCV V CV+0.1 V CV+0.2 V VOUT Over Voltage Protection V OOVP VOUT pin 5.1 5.3 5.5 V VOUT Load Regulation LRVO VOUT = 4.2V IOUT = 1.8A 5 %
Electrical Characteristics
[AP4305] Rev 0.5.0 7 Parameter Symbol Conditions Min Typ Max Unit Battery Output POWER MOSFET On Resistance RDS Between VOUT - BAT Pin VBAT=4.2V - 95 m Ω Power Switch ON Threshold Voltage VSWON VOUT-VBAT -5 -30 mV VOUT-VBAT Offset Voltage V OFS Constant Current Charge 150 mV Battery Over Voltage Detection V BOVP BAT Pin (note1) Vcv+0.1 Vcv+0.3 Vcv+0.5 V Battery Over Current Detection I BOCP 1.6 2.0 2.6 A BAT Pin Drain Current IBATQ VUSB<VUVLO or VUSB>VOVP - 15 μA Charge Voltage Range VCVR Programmable (50mV step) 4.05 4.4 V Charge Voltage Accuracy VCV Ta=10C 60C Ta=-30C 85C -0.5 -1.1 +0.5 +1.1 Fast Charge Start Voltage VCC 2.9 3.0 3.1 V Trickle Charge Threshold Voltage VTRKL 1.7 1.8 1.9 V Re-Charge Start Voltage VRECH (note1) Vcv-0.19 Vcv-0.12 Vcv-0.05 V Battery Ready Threshold Voltage VRDY Factory Preset Option (100mV step) Vcc+0.3 Vcc+0.6 V Fast Charge Current Range I FCHGR VCC<VBAT<VCV Programmable (100mA step) 600 1500 mA Fast Charge Current IFCHG VOUT1<VBAT<VCV IUSEBSET=1500mA 1356 1428 1500 mA VCC<VBAT<VOUT1 300 + 100*(VBAT - VCC)/0.05 Fast Charge Soft Switch ICSSW At changing Fast charge current in VOUT1<VBAT 100 mA/mS Trickle Charge Current ITRKL 50mA setting 33 42 50 mA 100mA setting 66 83 100 mA Full Charged Detection Current Accuracy I EOC I EOC>100mA -15 15 % IEOC≤100mA -25 25 % Charge Timer Accuracy dTCHG -10 0 10 % Battery Connect Detection Battery Connect Detection Lower Voltage VBBOT Ratio with V TREF 2.5 5.0 7.5 % Battery Connect Detection Upper Voltage VBTOP Ratio with V TREF 92.5 95 97.5 % (Note1) The values reflect set voltage according to control bit VCV[2:0], not including control bit VCV_FT[1:0]. CONFIDENTIAL
[AP4305] Rev 0.5.0 8 Parameter Symbol Conditions Min Typ Max Unit NTC Thermal Monitor TREF Output Voltage VTREF 1.62 1.80 1.98 V Low Temperature Lower Threshold TLOW Ratio with V TREF 69.9 70.9 71.9 % Low Temperature Lower Threshold Hysteresis TLOW_HYS Ratio with V TREF - -2.35 - % Normal Temperature Lower Threshold T COLD Ratio with V TREF 60.9 61.9 62.9 % Normal Temperature Lower Threshold Hysteresis TCOLD_HYS Ratio with V TREF - -2.75 - % Normal Temperature Upper Threshold TWARM Ratio with V TREF 33.1 34.1 35.1 % Normal Temperature Upper Threshold Hysteresis T WARM_HYS Ratio with V TREF - 2.35 - % Hot Temperature Upper Threshold THOT Ratio with V TREF 29.5 30.5 31.5 % Hot Temperature Upper Threshold Hysteresis THOT_HYS Ratio with V TREF - 2.35 - % High Temperature Lower Threshold T HIGH Ratio with V TREF 23.3 24.3 25.3 % High Temperature Lower Threshold Hysteresis THIGH_HYS Ratio with V TREF - 1.57 - % Thermal Shutdown Operating Temperature 1 TSDL Specific by TJ 80 100 120 C Thermal Shutdown Operating Temperature 2 TSDH 110 130 150 C Thermal Shutdown Hysteresis T SDHYS - 20 - C Logic I/O High Level Input Threshold (SCL) V IH 1.5 - - V Low Level Input Threshold (SCL) VIL - - 0.5 V Low Output Voltage (SDA, INTB, VRDYB) VOLLG Sink current = 3mA 0.5 V LED pin Low Output Voltage V OLLED Sink current = 6mA 0.4 V Power On Reset Power On Reset Threshold Voltage VPOR At Rising TREF pin Voltage (at release) 1.44 1.60 1.75 V At Falling TREF Pin Voltage 1.34 1.50 1.66 V CONFIDENTIAL
[AP4305] Rev 0.5.0 9 Operational Descriptions 1. Operational State The AP4305 has two operational states: SLEEP and ACTIVE. The operational state depends on the presence of primary power supply (whether appropriate voltage is applied or not). 1. SLEEP A state without primary power supply voltage (USB) (UVLO or lower, or OVP or higher). If battery voltage (VBAT voltage) is present, the AP4305 will be in the PowerSW state. A) PowerSW A state of a power switch from the battery (VBAT) to system load (VOUT). To reduce the consumption of current from VBAT, the operation of circuit blocks other than power switch control between the VOUT pin and the BAT pin will be stopped. In this state, the consumption of current from VBAT is 1 A (typ) excluding system load. The potential difference between the VOUT pin and the BAT pin is monitored to prevent the application of excessive voltage to the BAT pin. 2. ACTIVE A state with appropriate primary power supply voltage (USB) (UVLO or higher and OVLO or lower). There are the following three states (Charge/ No charge/ Suspend), depending on the condition of the battery etc. A) Charge If a battery is connected, the battery connected to the BAT pin is charged. The total of the power supplied to the battery and the VOUT load is limited by the current limiting circuit on the primary side. If the power to the load exceeds the primary power limit, charge current will be decreased to preferentially supply current to VOUT load. When the charge current will be stopped caused by VOUT power increasing, power will be supplied from the battery to the load through the power switch. B) No Charge A state in which charging is st opped because, for example, no batte ry is connected, charging is completed, or a protective function is activated. Power to the VOUT load will be supplied from the primary side through the DC/DC converter. If the power to the load exceeds the primary power limit, power to the load will be supplied from the battery through the diode. The condition for canceling this state differs depending on the condition that led to this state. (Refer to Protective Functions.) Operation mode enters to this mode by clear the CHGEN bit. And it can be returned to Charge mode by set the CHGEN bit while CHG_ENB pin is “L”. Once CHG_ENB pin is asserted to “H”, the operation mode enters No charge mode. While CHG_ENB is asserted to “H”, CHGEN bit is ignored. C) Suspend A state in which power from the primary side is limited by register settings. If power of the battery is available, power to the VOUT load will be supplied from the battery through the body diode of the power switch. The condition for canceling this state differs depending on the condition that led to this state. (Refer to Protective Functions.) Operation mode enters to this mode by set the DIS_VO bit. And it can be returned to operation mode by clear the DIS_VO. CONFIDENTIAL
[AP4305] Rev 0.5.0 10 2. Startup The AP4305 starts up when voltage is applied on the primary source. 2.1. Start up by primary power source The operating sequence is shown below. 1) VUSB voltage sense 2) USB PowerSW (internal FET) is turned ON. 3) VR voltage generation 4) Switching operation start (Start supplying power to VOUT from primary side via DC/DC converter) 5) Battery voltage and battery temperature determination. 6) Trickle charge start 7) Fast charge start CONFIDENTIAL
[AP4305] Rev 0.5.0 11 3. Charge Functions 3.1. Charge Control Charge Control operation flows are shown below. 3.1.1. Battery Connection Check The AP4305 monitors battery connection by using the TEMP input voltage value. If the TEMP input voltage is within a given range, the AP4305 determi nes that “a battery is connected” and if the TEMP input voltage is outside the given range, the AP4305 determ ines that “no battery is connected”. Charging will not be started while a battery is determined as not connected. The voltages for determining connection are VBTOP and VBBOT in Electrical Characteristics. 3.1.2. Battery Temperature Check Battery temperature is checked. If the battery temperature is not within the charge inhibition range (More than T LOW and Lower than THIGH), the AP4305 transitions to Trickle Charge 1 to start trickle charge. If the battery temperature is determined to be within the charge inhibition range (Less than TLOW and More than THIGH), the battery temperature is checked again after a certain period of time. 3.1.3. Trickle Charge 1 Assuming an over discharged state of the battery, constant-current charging is started at a current that does not damage the battery. At the same time, the internal timer starts counting. The battery voltage is periodically monitored, and when V TRKL is exceeded, the AP4305 transit ions to Trickle-charge 2. If the battery voltage does not exceed VTRKL even when the Trickle Charge 1 time-out time passes, the AP4305 determines that the battery is abnormal and transitions to “Battery Abnormality”. 3.1.4. Trickle Charge 2 Until the battery voltage reaches the voltage that allows fast charge (V CC), constant-current charging is continued at a current that does not damage the battery. The internal timer is reset and starts counting again. The AP4305 periodically monitors the battery voltage, and when V CC is exceeded, transitions to “Trickle Charge Check”. If the battery voltage does not exceed V CC even when the Trickle-charge 2 time-out time passes, the AP4305 determines that the battery is abnormal and transitions to “Battery Abnormality”. 3.1.5. Trickle Charge Check After the termination of trickle charge, whether batte ry voltage is checked. Depe nding on this, the operation after the full charge voltage check is chosen. 3.1.6. Fast Charge There are two states: constant-curr ent charging and constant-voltage c harging. Immediately after state transition, the fast charge timer starts counting and constant-current charging starts. When the battery voltage increases and reaches V CV, the AP4305 transitions to constant-voltage charging. Normally in constant-voltage charging, the charging curr ent decreases as t he charge becomes close to fu ll charge. When the charging current drops to or below IEOC, the AP4305 determines that the battery is fully charged and stops fast-charge if the operation mode is in constant-vol tage charging. (Option that full c harge current is not detected while detecting input current limit is selectable by I2C interface.) The state transitions to “Full Charge Voltage Check”. Even if the charge does not reach full charge after the fast charge time-out time passes, the AP4305 stops charging and transitions to “Full Charge Voltage Check”. If the battery voltage drops to or below V TRKL during charging, the AP4305 deter mines that the battery may have been disconnected and transitions to the Battery Abnormality state. CONFIDENTIAL
second. This is for checking for battery voltage decrease due to abnorma lities such as battery drainage. Recharging is executed. The charging operation is the same as that of fast charge. Typical startup timing charts are shown below. Battery voltage is less than start voltage of fast charge (Vcc) at start up. Figure 3. Charge profile (VBAT < VCC when start charge)
Figure 4. Flowchart of charge
- Thermal Shut Down
- Irregular BatteryTemp.
- No connected Battery Detect VOUT over voltage Detect Battery over voltage Detect Battery over current ICHG < Ieoc in CV mode or Time out Battery Temp. Check Trickle Charge 1 Trickle Charge 2 Trickle Charge Check Fast Charge Full Charge Voltage Check Extended Charge (Note) End of Charge Recharge USB Charge Port Detection Charge Enable Check Primary side power supply Detection Battery Connection Check CONFIDENTIAL
[AP4305] Rev 0.5.0 14 4. Protective Functions 4.1. Constant Monitoring In the charging flow, the following monitoring operation is executed periodically (120ms typ). Depending on the error status, the AP4305 transitions to Prohibit Charge, Charging Stop, or Battery Abnormality. Charging Stop: Canceled when the condition that issued the stop is canceled. Battery Abnormality: Canceled by Disconnection and Reconnection of t he battery, Toggle CHG_ENB pin, Clear CHGEN bit or VUSB<V UVLO. Prohibit Charge: Canceled by Toggle CHG_ENB pin, Clear CHGEN bit or VUSB<VUVLO. Chart 5. Constant Monitoring Monitoring Items Judgment Criteria Error Handling VOUT Over Voltage Detect V VOUT > VOVP in twice continuation Prohibit Charge Battery Over Voltage Detect V VBATS > VBOVP in twice continuation Prohibit Charge Battery Over Current Detect I CHG > IBOCP in twice continuation Prohibit Charge Thermal Shutdown 1 Detect T J > TSDL (Monitored 1ms cycle) Stop Charge Thermal Shutdown 2 Detect T J > TSDH (Monitored 1ms cycle) Stop Charge (Switching Stop) Battery Temperature Temperature range where eight times of average value are in. Stop Charge Battery Connection Detect V TBAT < VBBOT or VBTOP < VTBAT in three times continuation Stop Charge Battery Voltage Detect V VBATS< V TRKL in twice continuation after charge start Battery Voltage Drop 4.2. Thermal Shutdown The AP4305 constantly monitors IC junction temperature to prevent thermal runaway of the IC. If the internal temperature increases and exceeds TSDL, the AP4305 automatically stops charging. After charging is stopped, if the internal temperature drops below TSDHYS of the detected temperature, thermal shutdown is canceled, and charging is resumed. Whenever thermal shutdown is canceled, charging is resumed from trickle charge. On the contrary, if the temperature further increases and exceeds TSDH after charging is stopped, the power supply from VOUT also stops. When the junction temperature drops below TSDH, switching operation is resumed. CONFIDENTIAL
[AP4305] Rev 0.5.0 15 4.3. Safety Timer If a time-out of the safety timer occurs during a charging operation, the AP4305 determines that the battery is abnormal and stops the charging operation. As for the setting time for safe timer, the AP4305 can be programmed from following eight options by I2C interface. Writing or overwriting the register of the safety timer through I2C interface will reset the safety timer. For example, if the setting-7 is selected, overwriting within 30 minutes is necessary to keep continue charging. Chart 6. Trickle/ Fast Charge/ Recharge Safety Timer setting Items Symbol Setting 1 Setting 2 Setting 3 Setting 4 Setting 5 Setting 6 Setting 7 Setting 8 Trickle Charge 1 Safety Timer TTRKL1 0.5 hour 1 hour 2 hours 0.5 hours Trickle Charge 2 Safety Timer TTRKL2 Fast Charge Safety Timer TFCHG 3 hours 6 hours 6 hours 12 hours 12 hours 24 hours 0.5 hours 1 hours Recharge Safety Timer TRCHG Chart 7. Extended Charge Safety Timer setting Item Symbol Setting 1 Setting 2 Setting 3 Setting 4 Extended Charge Safety Time TECHG 0 hour 0.5 hours 1.0 hours Timer OFF Refer to the dTCHG in electrical characteristics regarding accuracy. 5. Charging Parameters In the AP4305, parameters related to charging can be configured with exte rnal input pin or setting by I interface. The setting parameters in charging are shown below. 5.1. Current Limit Function The input current limit value is set by the ILIM_SEL pin. When the input current limit value is programmed by I2C interface, the input current limit by ILIM_SEL pin is ignored. Chart 8. Input current limit setting for ILIM_SEL pin ILIM_SEL pin Input current limit High 100mA Low 500mA Chart 9. Input current limit setting for I2C programming Item Symbol Setting 1 Setting 2 Setting 3 Setting 4 Setting 5 Setting 6 Setting 7 Input current limit I ILIM 100mA 150mA 500mA 800mA 900mA 1500mA 1800mA Automatic current limit function when the input voltage is dropped When the real input power supply capacity is less than the input current limit level chosen as result of charge port detection, a charge current limit is set in the value of the upper limit that VUSB pin voltage is not less than VILVD within the charge current limit automatically. Once the input voltage drop is solved, input current limit by this function is released to original set value. CONFIDENTIAL
[AP4305] Rev 0.5.0 16 5.2. Charge Voltage Setting Chart 10. Full charge voltage setting Item Symbol Setting 1 Setting 2 Setting 3 Setting 4 Setting 5 Setting 6 Setting 7 Setting 8 Full Charge Voltage Chart 11. Fine tune of full charge voltage setting Item Symbol Setting 1 Setting 2 Setting 3 Setting 4 Full Charge Voltage Fine Tune Voltage VCV_FT 0mV 12.5mV 25.0mV 37.5mV Chart 12. Full charge voltage for the NTC thermistor monitor Item Symbol Setting 1 Setting 2 CV Charge Voltage (Low Temp. Range) VCVL Vcv Vcv – 0.15V CV Charge Voltage (High Temp. Range 1) VCVW Vcv – 0.15V Vcv – 0.15V CV Charge Voltage (High Temp. Range 2) VCVH Vcv – 0.15V Vcv – 0.15V (Note) VCVL setting is coupled with IFCHGL setting. CONFIDENTIAL
[AP4305] Rev 0.5.0 17 5.3. Charge Current Setting Charge current is configured as shown in the following chart. Chart 13. Fast charge current setting Item Symbol Setting Setting Setting Setting Setting Setting Setting Setting Setting Setting Fast Charge Current Chart 14. Fast charge current setting for the NTC thermistor monitor Item Symbol Setting1 Setting2 Fast Charge Current (Low Temp. Range) IFCHGL IFCHG*0.5 (Round down 50mA) IFCHG Fast Charge Current (High Temp. Range 1) IFCHGW IFCHG IFCHG*0.5 (Round down 50mA) Fast Charge Current (High Temp. Range 2) IFCHGH IFCHG IFCHG*0.5 (Round down 50mA) (Note) IFCHGL setting is coupled with VCVL setting. Chart 15. Trickle charge current setting Item Symbol Fixed Trickle 1 Charge Current ITRKL1 50mA Trickle 2 Charge Current ITRKL2 100mA Chart 16. Recharge current setting for the NTC thermistor monitor Item Symbol Fixed Recharge Current (Low Temp. Range) IRCHGL IFCHGL Recharge Current (Normal Temp. Range) IRCHG IFCHG Recharge Current (High Temp. Range 1) IRCHGW IFCHGW Recharge Current (High Temp. Range 2) IRCHGH IFCHGH Chart 17. Full Charge Detected Current setting Item Symbol Fixed Full Charge Detected Current IEOC IFCHG*0.1 CONFIDENTIAL
The default profile setting of charge current and voltage profile in fast charge mode are shown below. programmed “control bit of NTC = 0”. Hysteresis of each threshold temperatures are equivalent to 3C. stopped. Conditions of charge restarting as the following.
- Battery temperature is in nor mal temperature range. (Increasing VCV)
- Battery voltage is lower than V RECH.
Figure 5. Temperature dependent full charge voltage and current profile
Threshold of NTC therminsor monitor at “control bit of NTC = 1” as shown in the following chart. The NTC thermistor bias network at “control bit of NTC = 1” as shown in the following figure. Figure 6. NTC Thermistor bias network The value R1 and R2 can be determined by using the following equations.
1 RT R
Note) RT1 and RT2 are resistance values of the thermistor at different temperatures. VT1 and VT2 are ratios of the TEMP pin voltage from TREF pin voltages at different temperatures. are matched at all five points.
[AP4305] Rev 0.5.0 20 6. Logic Specifications The AP4305 has the following digital interfaces. SDA, SCL: I 2C interface Sets charging parameters and retrieves the state. INTB: Interrupt (output) Issues an interrupt according to state transition and protective functions. 6.1. I2C Interface specification Slave address: TBD Chart 20. I2Cinterfacetiming specification Items Symbol Conditions Min Typ Max Units SCL clock frequency fscl - - 400 kHz SCL clock High Time tHIGH 0.6 - - μs SCL clock Low Time tLOW 1.3 - - μs SDA/SCL Rise Time tR 20+0.1*Cb (Note1) - 300 ns SDA/SCL Fall Time tF - - 300 ns Start Condition Hold Time tHD:STA 0.6 - - μs Start Condition Setup Time tSU:STA 0.6 - μs SDA Hold Time tHD:DAT vs SCL falling edge 0 - 0.9 μs SDA Setup Time tSU:DAT vs SCL rising edge 100 - - ns Stop Condition Setup Time tSU:STO 0.6 - - μs Bus free time tBUF 1.3 - - μs Pulse width of Spike Noise Suppressed by Input Filter tSP - 50 - ns Note1: Cb means total capacity of a bus line. CONFIDENTIAL
The timing chart is shown below. Figure 7. Timing chart of I2C interface One-byte and multiple-byte write sequences are supported. automatically increments the register address in increments of one and writes the received data to the register. received data will be written in the address zero. The meaning of each symbol is as follows.
[AP4305] Rev 0.5.0 22 6.1.2. Read Sequence One-byte and multiple-byte read sequences are supported. In a read sequence, the register address is written first, and then data are read. By receiving its own slave address and the W bit in the first byte after the device receives a Start condition and also by receiving a register address in the second byte, the register address to start a read operation is specified. After that, when the device receives a Repeat Start c ondition and receives its own slave address and the R bit in the third byte, it sends data in the regi ster addresses specified in and after the fourth byte. Incrementing the register address in increments of one, the device continues sending read data until it receives a Stop condition. When after receiving a Start condition, the devices receives a register address and the R bit in the second byte without receiving a start address and the W bit as well as a register address, the device sends the data stored in the address zero (0x00) to the third byte. From the fourth byte, the device automatically increments the register address in increments of one and continues sending data until it receives a Stop condition. If the register address reaches the final address in the middle of a multiple-byte read sequence, the data sent next will be the data in the address zero. M-byte read sequence when Register Address = N Data(N)S WSlave Address A ARegister Address(N) AA Data(N+M-1) NA PRSlave AddressRS 6.2. Interrupt When the interrupt enable bit of each interrupt enable re gister is set and the applicable interrupt factor is detected, the respective interrupt flag bit is set and “L” is output to the INTB pin. Each interrupt flag bit is cleared by reading register. When all interrupt flag bits are cleared, the INTB pin stops the output of “L” and becomes open. The detection items for which an interrupt can be set are shown below. Charging status change - Fast charge start - Reaching VREADY voltage (The output pin is VRDYB, not INTB) - Constant voltage charge start - Extended charge state - Low input voltage detection - Fast charge/ Recharge safety timer expiration Charging stop - Thermal shutdown 1 - Battery temperature abnormality (high) - Battery temperature abnormality (low) Battery voltage drop - Low battery voltage abnormality - Trickle safety timer expiration Charging inhibition - VOUT overvoltage detection - Battery overvoltage detection - Battery over current detection CONFIDENTIAL
Figure 8. Register Map Note) Register default values of CFG2 and CFG3 are selectable as option at factory shipping.
This register is shown for Batter temperature and charge status. Figure 9. STATUS Register1 Bit Map
This register is shown for battery status. Figure 10. STATUS Register2 Bit Map
7 CBAT_ST R Battery connection error detection state
6 ILIM_ST R Input current limitation state
2 OCPF R Flag for Battery over current state
1 BOVPF R Flag for Battery over voltage state
0 VOVPF R Flag for VOUT over voltage state
This register is shown for interrupt flag status. the latest status is read when access for reading resister is executed. Figure 11. Interrupt Flag Register Bit Map
7 USBLVF R Flag for USB low voltage state
6 BATLVF R Flag for Battery voltage drop state
5 TSDF R Flag for Thermal shutdown state
4 INHF R Flag for Prohibit charge state
3 ENDF R Flag for End of charge state
2 TOUTF R Flag for timeout state
1 TEMPF R Flag for Irregular temperature state
0 CHGF R Flag for charging change state
This register is shown for battery temperature. Figure 12. TBAT Data Register Bit Map
This register is shown for control state. Figure 13. Control Register Bit Map
7 CHGEN R/W Charge Function Enable
6 RCHGEN R/W Recharge Function Enable
5 LEDEN R/W LED pin Function Enable
4 DIS_VO R/W DC/DC Conv erter operation Enable
This register is set for interrupt factor which is shown at INTB. Figure 14. Interrupt Enable Register Bit Map
7 USBLVIE R/W USB low voltage interrupt Enable
6 BATLIVE R/W Battery voltage drop interrupt Enable
5 TSDIE R/W Thermal shutdown interrupt Enable.
4 INHIE R/W Prohibit charge interrupt Enable
3 ENDIE R/W End of charge interrupt Enable
2 TOUTIE R/W Safety timer expiration interrupt Enable
1 TEMPIE R/W Irregular battery temperature interrupt Enable. 0 CHGIE R/W Charging change state interrupt Enable. ICHG<IEOC), interrupt is asserted.
This register is set for charge parameters. Figure 15. Configuration Register 1 Bit Map
7 IEOCS R/W End of charge current detecti on enable while input current limit is
1 DIS_VRDY R/W Battery Ready Detection Enable
0 DIS_IEOC R/W End of Char ge Current Detection Enable
This register is set for charge parameters. Figure 16. Configuration Register 2 Bit Map
4 VCT R/W CV Charge Voltage (Vcv) and Fast charge current for the Cold
0: CV Charge voltage for cold temp. range is set to VCV. Fast charge current for cold temp. range is set to IFCHG*0.5. Fast charge current for cold temp. range is set to IFCHG.
3 IFT R/W Fast charge current (I FCHG) for the High Temperature range
0: Fast charge current for high temp. range is set to IFCHG.
2 NTC R/W NTC setting
Figure 17. Configuration Register 3 Bit Map
[AP4305] Rev 0.5.0 32 IMPORTANT NOTICE These products and their specifications are subject to change without notice. When you consider any use or application of these prod ucts, please make inquiries the sales office of Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the products. Descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrate the operation and application examples of the semiconductor products. You are fully responsible for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. AKM assumes no responsibility for any losses incurred by you or third parties arising fr om the use of these information herein. AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of such information contained herein. Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. AKM products are neither intended nor authorized for use as critical components (Note1) in any safety, life support, or other hazard related device or system (Note2), and AKM assumes no responsibility for such use, except for the use approved with the express written consent by Representative Director of AKM. As used here: Note1) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of t he safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. Note2) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification. CONFIDENTIAL