LTC2942 Datasheet | Linear Technology

Features n Indicates Accumulated Battery Charge and Discharge n High Accuracy Analog Integration n ADC Measures Battery Voltage and Temperature n Integrated Temperature Sensor n High Side Sense n 1% Voltage and Charge Accuracy n ±50m V Sense Voltage Range n SMBus/I2C Interface 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 Battery Gas Gauge with Temperature, Voltage Measurement Description The LTC®2942 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 a 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 ∆∑™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the onboard SMBus/I2C interface. The LTC2942 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. The LTC2942 requires only a single low value sense resistor to set the measured current range. 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+ LTC2942 AL/CC SDA SENSE- SCL RSENSE 100mΩ + 1-CELL Li-Ion 2942 TA01a LOAD 0.1µF CHARGE ERROR (%) Total Charge Error vs Differential Sense Voltage 2.0...