LTC2942 - 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 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.

Features
  • 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/I2C 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
Typical Application
LTC2942 Typical Application
LTC2942 Typical Application
Applications
  • Low Power Handheld Products
  • Cellular Phones
  • MP3 Players
  • Cameras
  • GPS
Packaging
LTC2942 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2942CDCB#PBF2x3 DFN-6C$2.19
LTC2942CDCB#TRMPBF2x3 DFN-6C$2.19$1.55
LTC2942CDCB#TRPBF2x3 DFN-6C$2.14$1.50
LTC2942IDCB#PBF2x3 DFN-6I$2.62
LTC2942IDCB#TRMPBF2x3 DFN-6I$2.62$1.85
LTC2942IDCB#TRPBF2x3 DFN-6I$2.57$1.80
Demo Boards
Part NumberDescriptionPrice
DC1496C-BLTC2942 Demo Board | 2.7V to 5.5V Battery Gas Gauge Plus Voltage/Temp Measurements, w/ I2C (req. DC590)$50.00
Companion Boards
Part NumberDescriptionPrice
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Datasheet
Reliability Data
Product Selector Card
LT Journal
Software and Simulation
CAD Symbol
Linduino
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