STC3100

STC3100 Battery monitor IC with Coulomb counter/gas gauge Features ■ Battery voltage monitoring ■ Internal temperature sensor ■ Coulomb counter with 12/14-bit AD converter, +/- 80 mV input voltage range ■ Internal or external 32768 Hz time base ■ I2C interface for gas gauge monitoring and device control ■ 32-RAM bytes ■ 8-byte unique device ID ■ One general-purpose I/O Applications ■ Cellular phones, PDA, MP3 players, cordless phones ■ Digital cameras, USB appliances, Bluetooth devices Description The STC3100 monitors the critical parameters of a single-cell Li-Ion battery (voltage, temperature and current) and includes hardware functions to implement a gas gauge for battery charge monitoring, based on a programmable 12- to 14-bit A/D converter. With a typical 30 milliOhms external sense resistor, the battery current can be up to 2.5 A and the accumulator system provides a capacity up to +/-7000 mAh with a resolution of 0.2 mAh. The device is programmable through the I2C interface. MiniSO-8 (Plastic micropackage) DFN8 3x3 (Plastic micropackage) Pin connections (top view) IO0 1 ROSC 2 SDA 3 SCL 4 8 VIN 7 VCC 6 CG 5 GND January 2009 Rev 1 1/21 www.st.com 21 Block diagram 1 Block diagram Figure 1. STC3100 internal block diagram STC3100 VCC SCL SDA Accumulators and control registers 1.2 V reference 32 kHz time base Oscillator AD converter 11 bits (unsigned) MUX Temp sensor AD converter 12 / 14 bits (signed) CG+ CG- ROSC VIN CG General-purpose I/O line ...