LINEAR 2PB_29421b I 2 C Battery Gas Gauges User Manual
Summary
These advanced IC battery gas gauges provide precise state-of-charge monitoring for various Li-Ion batteries. The integrated LTC2942/LTC2941 series features continuous-time analog integration, measuring accumulated charge, voltage, and temperature with high accuracy. This technical guide details the components' specifications, interfacing via I²C/SMBus, programmable thresholds, and compatibility with other power management ICs (e.g., LTC4099). Ideal for electronics designers developing complex, battery-powered systems requiring reliable energy monitoring.
Page 1 Text Content
I2C Battery Gas Gauges CHARGER
LTC2942-1
HOST I2C
REGISTER
Measure Charge, Voltage and Temperature
For applications requiring accurate battery gas gauging, the LTC®2941 and LTC2942 coulomb counters provide tiny and easy-to-use solutions. The LTC2941/LTC2942 use a continuous-time analog integrator, resulting in minimal offset and gain error and better overall charge accuracy. The bidirectional analog integrator accommodates both battery charge and discharge, and a programmable prescaler allows for a wide range of battery capacities. The LTC2942 incorporates a 14-bit ∆∑ ADC to measure battery voltage and die temperature. The LTC2941-1 and LTC2942-1 also integrate a 50mΩ sense resistor to provide up to ±1A measurement range. Charge, voltage* and temperature* are all communicated to the host system over an I2C/SMBus compatible interface.
Features Linear Technology I2C Battery Gas Gauges n Indicates Accumulated Battery Charge and Discharge
LTC2941/ LTC2942/
n SMBus/I2C Interface LTC2941-1 LTC2942-1 n 14-Bit ADC Measures Battery Voltage and Temperature
Operating Voltage Range 2.7V to 5.5V 2.7V to 5.5V
(*LTC2942)
Voltage and Temperature No Yes
n High Side Current Sense with ±50m V Sense Range Measurement
n Integrated 50mΩ High Side Sense Resistor with ±1A Integrated Sense Resistor No/Yes No/Yes
Range (LTC2941-1/LTC2942-1) Package 2mm × 3mm 2mm × 3mm
n 1% Voltage and Charge Accuracy DFN-6 DFN-6
n ±50m V Sense Voltage Range
n Programmable High/Low Thresholds for All Measured
Total Charge Error (TCE) Over Temperature
Parameters
n Configurable Alert Output/Charge Complete Input Part Sense Resistor TCE
n Quiescent Current <100µA LTC2942-1 N/A 2.8%
LTC2942 ±1%, 100ppm/°C ($0.10) 5.1%
±0.1%, 50ppm/°C ($0.30) 3.9% ±0.1%, 15ppm/°C ($3.75) 3.6%
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Power Path and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Page Summary Contents For LINEAR 2PB_29421b I 2 C Battery Gas Gauges User Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 2 |
| File Size | 980.15 KB |
| Published | June 19, 2026 |
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Frequently Asked Questions
What is the operating voltage range for the battery gas gauges?
The operating voltage range is 2.7V to 5.5V.
Do the LTC294x series support both charging and discharging measurements?
Yes, the bidirectional analog integrator accommodates both battery charge and discharge.
How accurate are the measurements for different models?
Accuracy varies by model; for example, the LTC2942 has a 14-bit ADC to measure voltage and temperature.
What kind of interface communicates the data to the host system?
Charge, voltage, and temperature are communicated over an I²C/SMBus compatible interface.