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1. 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 communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register.
2. Features
1. Indicates Accumulated Battery Charge and Discharge
2. SMBus/I2C Interface
2. Integrated 50mΩ High Side Sense Resistor
3. ±1A Sense Current Range
4. High Accuracy Analog Integration
5. ADC Measures Battery Voltage and Temperature
6. Integrated Temperature Sensor
7. 1% Voltage and Charge Accuracy
8. Configurable Alert Output/Charge Complete Input
9. 2.7V to 5.5V Operating Range
10. Quiescent Current Less than 100µA
11. Small 6-Pin 2mm × 3mm DFN package
3. Applications
1. Low Power Handheld Products
2. Cellular Phones
3. MP3 Players
4. Cameras
5. GPS
4. Pin Configuration
5. Electrical Characteristics
6. package instruction
