Linear LTC2942IDCB#TRMPBF Battery Temperature, Voltage Measurement SMBus DFN-6

The Linear Technology 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 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 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.

• 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
• ±50mV sense voltage range
• Smbus/i 2 C interface
• Configurable alert output/charge complete input
• 2.7V to 5.5V operating range
• Quiescent current less than 100μA
• Small 6-Pin 2mm × 3mm DFN package
• Operating temp.: -40 to +85°C