LTC2942-1 Datasheet | Linear Technology

Features n Indicates Accumulated Battery Charge and Discharge n SMBus/I2C Interface n Integrated 50mΩ High Side Sense Resistor n ±1A Sense Current Range n High Accuracy Analog Integration n ADC Measures Battery Voltage and Temperature n Integrated Temperature Sensor n 1% Voltage and Charge Accuracy n Configurable Alert Output/Charge plete Input n 2.7V to 5.5V Operating Range n Quiescent Current Less than 100µA n Small 6-Pin 2mm × 3mm DFN package Applications n Low Power Handheld Products n Cellular Phones n MP3 Players n Cameras n GPS LTC2942-1 1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement Description The LTC®2942-1 measures battery charge state, battery voltage and chip temperature in handheld PC and portable product applications. Its operating range is perfectly suited for single cell Li-Ion batteries. A precision coulomb counter integrates current through an internal sense resistor between the battery’s positive terminal and the load or charger. Battery voltage and on-chip temperature are measured with an internal 14-bit No Latency ∆Σ™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the onboard SMBus/I2C interface. The LTC2942-1 Features programmable high and low thresholds for all three measured quantities. If a programmed threshold is exceeded, the device municates an alert using either the SMBus alert protocol or by setting a flag in the internal status register. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency ∆Σ, Thin SOT and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application CHARGER I2C/SMBus TO HOST SENSE+ AL/CC SDA SENSE- LOAD 0.1µF + 1-CELL Li-Ion 29421 TA01a CHARGE ERROR (%) Total Charge Error vs Sense Current 1.00 VSENSE+ = 3.6V -...