AAT4296 AAT

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 18

Technical content

Features

  • V IN Range: 1.8V to 5.5V
  • Independent Push/Pull Channels — AAT4296: Five Channels — AAT4298: Six Channels
  • User-Programmable Interface
  • Single GPIO Controls State of Each Output
  • Optional Fast Auto-Discharge
  • Low Quiescent Current: 3µA Typical
  • Temperature Range: -40°C to +85°C
  • Available in Pb-Free Packages: — AAT4296: 8-Pin SC70JW — AAT4298: 10-Pin SC70JW and 12-Pin TSOPJW

Applications

  • Cell Phones
  • Multiple Low Power Switching
  • Personal Communication Devices
  • Portable Electronic Devices Typical Application AAT4298 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 GND OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6EN/SETEN/SET Input VCC Input VCC

SC70JW-8 SC70JW-10 TSOPJW-12 (Top View) (Top View) (Top View) N/C GND OUT5 OUT4 OUT3 N/C N/C EN/SET OUT1 OUT2 VCC OUT6 EN/SET OUT1 OUT2 VCC OUT6 GND N/C OUT5 OUT4 OUT3 OUT2 OUT1 EN/SET OUT3 OUT4 OUT5 GND VCC 1 Pin # AAT4298 AAT4298 AAT4296 SC70JW-10 TSOPJW-12 Symbol Function 1 7 8 VCC Input supply voltage. 2 8 9 OUT2 Channel 2 output pin. 3 9 10 OUT1 Channel 1 output pin. 4 10 11 EN/SET Input control pin using S 2Cwire serial interface. The device records rising edges of the clock and decodes them into 32 (AAT4296) or 64 (AAT4298) states controlling the ON/OFF states of the outputs. See Table 1 for output settings. In addi- tion, a logic low forces the device into shutdown mode, reduc- ing the supply current to less than 1µA. This pin should not be left floating. 5 1 2 GND Ground. 6 3 3 OUT5 Channel 5 output pin. 7 4 4 OUT4 Channel 4 output pin. 8 5 5 OUT3 Channel 3 output pin. N/A 6 7 OUT6 Channel 6 output pin. N/A 2 1, 6, 12 N/C Not connected. AAT4296/98 Five/Six Channel Push/Pull I/O Expander 2 4296.2006.12.1.3

Symbol Description Value Units θJA Thermal Resistance2 SC70JW-8, SC70JW-10 225 °C/WTSOPJW-12 160 PD Maximum Power Dissipation3 SC70JW-8, SC70JW-10 440 mWTSOPJW-12 625 Symbol Description Value Units VCC to GND Input to GND -0.3 to 6.0 V OUTx to GND Output (Source) to GND -0.3 to V IN + 0.3 V EN/SET EN/SET to GND -0.3 to 6.0 V TJ Operating Junction Temperature Range -40 to +150 °C AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 3 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3. Derate 4.4mW/°C above 25°C.

Electrical Characteristics1 VCC = 5.0V; TA = -40°C to +85°C, unless otherwise noted. Typical values are T A = 25°C. Symbol Description Conditions Min Typ Max Units VCC Supply Voltage Range 1.8 5.5 V IQ Quiescent Current EN/SET = VCC = 5V, IOUT = 0, 3.0 10 µAAll Switches ON EN/SET = GND, VCC = 5V, 1.0 OUTx = Open On Resistance P-Channel VCC = 5V 2.5 6.0 RDS(ON) VCC = 3.6V 3.0 7.0 Ω On Resistance N-Channel VCC = 5V 1.9 6.0 VCC = 3.6V 2.0 7.0 TCRDS On Resistance 2800 ppm/°CTemperature Coefficient TON Output Turn-On Time2 VCC = 5V, COUT = 100nF; TA = 25°C 1.6 2.7 µs TOFF Output Turn-Off Time3 VCC = 5V, COUT = 100nF; TA = 25°C 0.8 2.1 µs EN/SET VEN(L) Enable Threshold Low V IN = 1.8V 0.4 V VEN(H) Enable Threshold High V IN = 5.5V 1.4 V TEN/SET LO EN/SET Low Time 0.5 75 µs TEN/SET_HI_MIN Minimum EN/SET High Time 50 ns TEN/SET_HI_MAX Maximum EN/SET High Time 75 µs TOFF EN/SET Off Timeout 500 µs TLAT EN/SET Latch Timeout 500 µs IEN/SET EN/SET Input Leakage -1 1 µA AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4 4296.2006.12.1.3 1. The AAT4296/98 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. TON is the time after latch timeout to 90% of the output voltage. See Figure 1. 3. TOFF is the time after off timeout to 10% of the output voltage. See Figure 1.

Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C. P-Channel RDS(ON) vs. Temperature (ILOAD = 100mA) Temperature (°°C) RDS(ON) (Ω) RDS3 RDS1 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 -40 -20 0 20 40 60 80 100 RDS6 RDS5 RDS4 RDS2 P-Channel RDS(ON) vs. Input Voltage (ILOAD = 100mA) Input Voltage (V) RDS(ON) (ΩΩ) RDS1 RDS2 RDS6 RDS5 RDS4 RDS3 VIL vs. Input Voltage Input Voltage (V) VIL (V) 0.4 0.50.6 0.7 0.8 0.91.0 85°C 25°C -40°C VIH vs. Input Voltage Input Voltage (V) VIH (V) 0.6 0.70.8 0.9 1.01.1 1.2 85°C 25°C -40°C Quiescent Current vs. Temperature Temperature (°°C) Quiescent Current (μA) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 -40 -20 0 20 40 60 80 100 VCC = 5.0V VCC = 3.6V Quiescent Current vs. Input Voltage Input Voltage (V) Quiescent Current (μμA) 0.0 0.5 1.0 1.52.02.5 3.0 3.5 85°C 25°C -40°C AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 5

Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C. EN/SET Off Timeout vs. Temperature Temperature (°C) Off Timeout, TOFF (μs) 100150 200 250 300350 -40 -20 0 20 40 60 80 100 VCC = 3.3V VCC = 1.8V VCC = 5.0V EN/SET Latch Timeout vs. Temperature Temperature (°C) Latch Timeout, TLAT (µs) 100 150 200 250 300 350 -40 -20 0 20 40 60 80 100 VCC = 5.0V VCC = 3.3V VCC = 1.8V N-Channel RDS(ON) vs. Temperature (VCC = 3.6V; ILOAD = 100mA) Temperature (°°C) RDS(ON) (Ω) 0.0 0.51.0 1.5 2.0 2.53.03.5 -40 -20 0 20 40 60 80 100 RDS6 RDS5 RDS2 RDS1 RDS3 RDS4 P-Channel RDS(ON) vs. Temperature (VCC = 3.6V; ILOAD = 100mA) Temperature (°°C) RDS(ON) (Ω) 2.2 2.5 2.8 3.1 3.4 3.7 4.0 -40 -20 0 20 40 60 80 100 RDS1 RDS4 RDS2 RDS5 RDS3 RDS6 N-Channel RDS(ON) vs. Temperature (ILOAD = 100mA) Temperature (°°C) RDS(ON) (Ω) 0.8 1.1 1.4 1.7 2.0 2.3 2.6 2.9 -40 -20 0 20 40 60 80 100 RDS6 RDS3 RDS4 RDS5 RDS2 RDS1RDS1 N-Channel RDS(ON) vs. Input Voltage (ILOAD = 100mA) Input Voltage (V) RDS(ON) (ΩΩ) 1.0 1.5 2.0 2.53.0 3.5 4.0 RDS6 RDS5 RDS2 RDS1 RDS3 RDS4 AAT4296/98 Five/Six Channel Push/Pull I/O Expander 6 4296.2006.12.1.3

Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C. Turn-On Characteristic (RLOAD1 = RLOAD2 = 100ΩΩ; COUT1 = COUT2 = 0.1μF) Time (50μs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) Turn-On Characteristic (RLOAD1 = RLOAD2 = 100ΩΩ; COUT1 = COUT2 = 0.1μF) Time (50μs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) Turn-On Characteristic (RLOAD1 = RLOAD2 = 100ΩΩ; COUT1 = COUT2 = 0.1μF) Time (50μs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) Turn-On Characteristic (RLOAD1 = RLOAD2 = 100ΩΩ; COUT1 = COUT2 = 0.1μF) Time (50μs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) Turn-On and Turn-Off Time vs. Temperature Temperature (°°C) Time (μs) 0.0 0.40.8 1.2 1.6 2.0 -40 -20 0 20 40 60 80 100 TON (Rise Time) TOFF (Fall Time) EN/SET Timeout vs. Input Voltage Input Voltage (V) Timeout (μs) 110 140170200 230 260290 TLATCH TOFF AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 7

Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTx = 0.1µF, TA = 25°C. Time (50µs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (100mV/div, AC coupled) Turn-On Transient Characteristic (RLOAD1 = RLOAD2 = 100Ω; COUT1 = COUT2 = 0.1µF) Transition of Outputs (RLOAD1 = RLOAD2 = 100Ω; COUT1 = COUT2 = 0.1µF) Time (50µs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) Turn-Off Characteristic (RLOAD1 = RLOAD2 = 100ΩΩ; COUT1 = COUT2 = 0.1μF) Time (50μs/div) EN/SET (5V/div) VOUT1 (5V/div) VOUT2 (5V/div) AAT4296/98 Five/Six Channel Push/Pull I/O Expander 8 4296.2006.12.1.3

Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 9 Functional Description The AAT4296/98 is comprised of five/six push/pull output slew rate limited load switches primarily tar- geted for microcontroller general purpose input/output (I/O) expansion applications. Each push/pull output is supplied by the common V CC input and is controlled via the digital EN/SET input pin. When a given output is enabled, the voltage source applied to the VCC pin is then switched to the respective output. The high-side P-channel MOSFET transistor has a typical on resistance DS(ON)) of 3Ω when operating from a 3.6V supply. When a respective output is disabled or turned off, the given output pin is then connected to ground through a low side N-channel MOSFET with a typi- cal on resistance (R DS(ON)) of 2Ω. This circuit archi- tecture affects a simple logic control with the high level based on the applied V CC. For the AAT4296, this creates a 1-to-5 I/O expander, and for the AAT4298 this creates a 1-to-6 I/O expander. Both the AAT4296 and AAT4298 have been designed to operate with an input voltage range of 1.8V to 5.5V, making them ideal for battery-powered applications. Functional Block Diagram VCC GND OUT1 AAT4298 OUT2 OUT3 OUT4 OUT5 EN/SET S2Cwire Serial Interface OUT6

Table 1: Output Settings. AAT4298 AAT4298 AAT4296 (only) Clock OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 Clock OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 1 on on on on on on 33 off on on on on on 2 on on on on on off 34 off on on on on off 3 on on on on off on 35 off on on on off on 4 on on on on off off 36 off on on on off off 5 on on on off on on 37 off on on off on on 6 on on on off on off 38 off on on off on off 7 on on on off off on 39 off on on off off on 8 on on on off off off 40 off on on off off off 9 on on off on on on 41 off on off on on on 10 on on off on on off 42 off on off on on off 11 on on off on off on 43 off on off on off on 12 on on off on off off 44 off on off on off off 13 on on off off on on 45 off on off off on on 14 on on off off on off 46 off on off off on off 15 on on off off off on 47 off on off off off on 16 on on off off off off 48 off on off off off off 17 on off on on on on 49 off off on on on on 18 on off on on on off 50 off off on on on off 19 on off on on off on 51 off off on on off on 20 on off on on off off 52 off off on on off off 21 on off on off on on 53 off off on off on on 22 on off on off on off 54 off off on off on off 23 on off on off off on 55 off off on off off on 24 on off on off off off 56 off off on off off off 25 on off off on on on 57 off off off on on on 26 on off off on on off 58 off off off on on off 27 on off off on off on 59 off off off on off on 28 on off off on off off 60 off off off on off off 29 on off off off on on 61 off off off off on on 30 on off off off on off 62 off off off off on off 31 on off off off off on 63 off off off off off on 32 on off off off off off 64 off off off off off off AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 11

Five/Six Channel Push/Pull I/O Expander 12 4296.2006.12.1.3 The S2Cwire interface relies on the number of ris- ing edges of the EN/SET pin to address and load the registers. S 2Cwire latches data or address after the EN/SET pin has been held high for time T LAT. The interface records rising edges of the EN/SET pin and decodes them into 32 (for AAT4296) or 64 (for AAT4298) different states, as indicated in Table 1. There are 32 (for AAT4296)/ 64 (for AAT4298) different sequences for control- ling individual turn-on/turn-off of each switch. The counter can be clocked at speeds up to 1MHz, such that intermediate states are not visible. Alternatively, the EN/SET clock pulses may be entered one at a time for desired setting. The first rising edge of EN/SET enables the IC and turns all the switches ON. Once the final clock cycle is received, the EN/SET pin is held high to maintain the device setting. The device is disabled 500µs OFF) after the EN/SET pin transitions to a logic low state. Figure 3: Timing Diagram. OUTn TH TL TLAT TON TO TOFF EN/SET Applications Information The AAT4296 and AAT4298 have been designed so that no external parts are required for the device to function as a general purpose I/O expander. Such external parts could include bypass capaci- tors, or pull-up or pull-down resistors. For applications which may use some or all of the output to switch light load current levels to applica- tion circuits, good engineering practice would dic- tate the use of small bypass capacitors place on the V CC input and each output which is being used to conduct current to a load. The use of small ceramic capacitors between the input and output nodes to ground will aid in reducing line and load transient response effects. Refer to the application schematic of Figure 4 for an example for placing bypass capacitors. Input Capacitor Typically a 0.1µF to 1µF capacitor is recommend- ed for C IN in most applications. A C IN capacitor is not required for basic operation; however, C IN is useful in preventing load transient effects from affecting upstream circuits when internal switches are enabled to their respective output load circuits. C IN should be located as close to the device VIN pin as practically possible. There is no specific capacitor equivalent series resistance (ESR) requirement for CIN; however, for higher current operation, ceramic capacitors are rec- ommended for CIN due to their inherent capability over tantalum or aluminum electrolytic capacitors to withstand input current surges from low impedance sources, such as batteries in portable devices. Output Capacitor For typical applications where the AAT4696/98 is used for I/O expansion, no output capacitors are required. Many other common applications such as controlling LED indicator lamps in portable prod- ucts do not require an output capacitor because the end load is not sensitive to device turn-on tran- sient effects. For improved load transient response in systems using the AAT4296/98 for load switching, the addi- tion of a small output capacitor placed between the output pins and ground can have a beneficial effect. A 0.1µF ceramic capacitor is suggested as a reasonable value for an output capacitor. Please refer to Figure 4.

Figure 4: Typical Application Diagram. AAT4298 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 GND OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6EN/SETEN/SET Input VCC Input VCC AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 13 The output capacitor has no specific capacitor type or ESR requirement. If desired, C OUT may be increased to a value greater than 0.1µF without limit to accommodate any load transient condition without adversely affecting the device turn-on slew rate time. Thermal Considerations The AAT4296 and AAT4298 are designed to deliv- er continuous output load currents. The limiting characteristic for maximum safe operating output load current is package power dissipation. In order to obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. At any given ambient temperature (T A), the maxi- mum package power dissipation can be deter- mined by the following equation: Constants for the AAT4296 and AAT4298 are max- imum junction temperature, T J(MAX) = 125°C, and package thermal resistance, θJA = 120°C/W. Worst- case conditions are calculated at the maximum operating temperature, where T A = 85°C. Typical conditions are calculated under normal ambient conditions, where T A = 25°C. At 25°C ambient, the AAT4296 is capable of dissi- pating 440mW of power. If all five channels have 5.0V output, the average current is 121mA per channel. The AAT4298 is capable of dissipating 625mW of power. If all six channels have 5.0V out- put, the average current is 131.5mA per channel. At 85°C ambient, the AAT4296 is capable of dissi- pating 177.78mW of power. If all five channels have 5.0V output, the average current is 76.5mA per channel. The AAT4298 is capable of dissipat- ing 250mW of power. If all six channels have 5.0V output, the average current is 83mA per channel. PD(MAX) = TJ(MAX) - TA θJA *Use of capacitors on each output is optional.

Five/Six Channel Push/Pull I/O Expander 14 4296.2006.12.1.3 Figure 5: Infrared, Bluetooth, RGB, and Backlighting Control. IN EN/SET OUT2 GND OUT6 OUT5 OUT4OUT3 OUT1 AAT4296 RG B A series of pulses Bluetooth Device EN Infrared Device EN Backlighting Driving LED Loads The AAT4296 and AAT4298 can be used to drive LEDs or other applications with light load current requirements. LED applications may include main and sub-LCD display backlighting, camera photo- flash applications, color (RGB) LEDs, and infrared (IR) diodes for remotes. In series with LEDs, bal- last resistors must be used to limit the LED current. The LED current will vary with supply voltage and LED forward voltage. Most types of LEDs have for- ward voltage specifications ranging from 2.0V to 5.0V. Calculate the necessary ballast resistor value from the following formula: Where: R LED is the resistance of resistor to be placed in series with the LED (Ω). VIN is the input supply voltage to the device (V). VF is the forward voltage of the LED (V). RDS(ON) is the resistance of the switch when it is turned on (Ω). ILED is the desired operating current of the LED (A). RLED = - R DS(ON) (VIN - VF) ILED

Figure 6: GPIO I/O Expander (Condense Five GPIO Control Lines to One Using AAT4296). Circuit 1 30mA Circuit 2 30mA Circuit 3 30mA Circuit 4 30mA Circuit 5 30mA System µController GPIO 1 GPIO 2 GPIO 3GPIO 4 GPIO 5 VIN VIN VIN VIN VIN GPIO 2 to GPIO 5 are now free for other uses IN OUT1 OUT2 OUT3 OUT4OUT5 AAT4296 Low Dropout Voltage Regulator EN/SET AAT4296/98 Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 15

Five/Six Channel Push/Pull I/O Expander 16 4296.2006.12.1.3

Ordering Information

Package Information

All dimensions in millimeters. 0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05

1.10 MAX

0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means Package Marking 1 Part Number (Tape and Reel)2 SC70JW-8 QIXYY AAT4296IJS-T1 SC70JW-10 AAT4298IJQ-T1 TSOPJW-12 QEXYY AAT4298ITP-T1 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.

Five/Six Channel Push/Pull I/O Expander 4296.2006.12.1.3 17 SC70JW-10 All dimensions in millimeters. 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 4° ± 4° 0.15 ± 0.05 2.00 ± 0.20 7° ± 3° 0.85 ± 0.15 0.100 0.225 ± 0.075 1.75 ± 0.10 2.20 ± 0.20

0.40 BSC

All dimensions in millimeters. 0.20 + 0.10 - 0.05 0.055 ± 0.045 0.45 ± 0.15 7° NOM 4° ± 4° 3.00 ± 0.10 2.40 ± 0.10 2.85 ± 0.20 0.15 ± 0.05 0.9625 ± 0.0375 1.00 + 0.10 - 0.065

0.04 REF

0.010 2.75 ± 0.25 AAT4296/98 Five/Six Channel Push/Pull I/O Expander 18 4296.2006.12.1.3 Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech pr oduct. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service wi thout notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of l iability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accorda nce with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific tes ting of all parameters of each device is not necessarily performed.