Battery Gas Gauge with Temperature, Voltage Measurement

The LTC2942 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 ΔΣ™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the on-board SMBus/I2C interface.

The LTC2942 features programmable high and low thresholds for all three measured quantities. If a programmed threshold is exceeded, the device communicates 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.

Integrated Sense Resistor

LTC2942

No

LTC2942-1

Yes

Applications

* Low Power Handheld Products

* Cellular Phones

* MP3 Players

* Cameras

* GPS

* Indicates Accumulated Battery Charge and Discharge

* High Accuracy Analog Integration

* ADC Measures Battery Voltage and Temperature

* Integrated Temperature Sensor

* High Side Sense

* 1% Voltage and Charge Accuracy