DS2741N+

19-4683; Rev 1; 7/09 Current Monitor and Accumulator with Integrated Sense Resistor The DS2741 current monitor/accumulator is a complete current-sensing, measuring, and accumulation device tailored for cost-sensitive, battery-powered applications in a small 3mm x 3mm TDFN package. As a result, the DS2741 is a key component in battery-charge control and remaining capacity-estimation applications. Through its I2C interface, the DS2741 gives the host system access to current measurement and accumulation registers. The 7-bit slave address is factory programmable, allowing up to 128 devices to be individually addressed by the host system. Applications Cell Phones ♦ Complete, Low-Cost, Integrated Current-Sensing and Accumulation Solution with Serial Digital Output ♦ On-Board 38mΩ Sense Resistor ♦ Current Measurement: Signed 10-Bit Bidirectional Measurement ±2.5A Dynamic Range 1% Error at +25°C 2% Error Over Temperature ♦ Current Accumulation: 0.247mAhr LSB ±8.1Ahrs Full-Scale Range ♦ Industry-Standard I2C Interface with FactoryProgrammable Slave Address PDAs Battery Monitor/Rechargers ♦ 2.5V to 4.5V Single-Supply Operation Ordering Information PART Features ♦ Low-Power Consumption: Active Current: 60µA (typ) Sleep Current: 1µA (typ) TEMP RANGE PIN-PACKAGE DS2741N+ -20°C to +70°C 14 TDFN-EP* ♦ -20°C to +70°C Operating Range DS2741N+T -20°C to +70°C 14 TDFN-EP* ♦ 14-Pin TDFN (3mm x 3mm x 0.8mm) +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *EP = Exposed pad. Pin Configuration Typical Operating Circuit TOP VIEW RS- RS- RS- RS- SLP GND DNC CHARGER/ LOAD 14 RS+ 13 12 11 10 9 8 RSDC-DC CONVERTER DS2741 VCC Li + BATTERY 1.8V SLP 2.2kΩ EP* + 2.2kΩ DS2741 0.1μF GND SDA SCL MICROPROCESSOR 1 2 3 4 5 6 7 RS+ RS+ RS+ RS+ SDA SCL VCC TDFN *EXPOSED PAD ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 DS2741 General Description DS2741 Current Monitor and Accumulator with Integrated Sense Resistor ABSOLUTE MAXIMUM RATINGS Pulsed Internal Sense Resistor Current ..................................±10A for