LTC2943 - Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement

The LTC®2943 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage range allows use with multicell batteries up to 20V. A precision coulomb counter integrates current through a sense resistor between the battery’s positive terminal and the load or charger. Voltage, current and temperature are measured with an internal 14-bit No Latency ΔΣ™ ADC. The measurements are stored in internal registers accessible via the onboard I2C/SMBus Interface.

The LTC2943 features programmable high and low thresholds for all four 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 LTC2943 requires only a single low value sense resistor to set the measured current range.

Features
  • Measures Accumulated Battery Charge and Discharge
  • 3.6V to 20V Operating Range for Multiple Cells Application
  • 14-Bit ADC Measures Voltage, Current and Temperature
  • 1% Voltage, Current and Charge Accuracy
  • ±50mV Sense Voltage Range
  • High Side Sense
  • General Purpose Measurements for Any Battery Chemistry and Capacity
  • I2C/SMBus Interface
  • Configurable Alert Output/Charge Complete Input
  • Quiescent Current Less Than 120μA
  • Small 8-Lead 3mm × 3mm DFN Package
Typical Application
LTC2943 Typical Application
LTC2943 Typical Application
Applications
  • Power Tools
  • Electric Bicycles
  • Portable Medical Equipment
  • Video Cameras
Packaging
LTC2943 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2943CDD#PBF3x3 DFN-8C$3.36$2.35
LTC2943CDD#TRPBF3x3 DFN-8C$2.41
LTC2943IDD#PBF3x3 DFN-8I$4.03$2.82
LTC2943IDD#TRPBF3x3 DFN-8I$2.88
Demo Boards
Part NumberDescriptionPrice
DC1812A-ALTC2943 Demo Board | 20VIN, 0.5A Battery Gas Gauge w/ Ext RSENSE (req. DC2026)$50.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Datasheet
Reliability Data
Product Selector Card
Press Release
CAD Symbol
Linduino
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LTC2943 Footprints and Symbols
LTC2943 - DC1812A Linduino.INO File
LTC2943 Linduino Header File
LTC2943 Linduino.CPP