LTC2942 1-Cell Lithium Battery Gas Gauge Breakout
IC description(Manufacturer product page)
LTC2942 - Battery Gas Gauge with Temperature, Voltage Measurement
Just ordered a breakout for LTC2942 single cell lithium battery gas gauge, an I2C controlled coulomb counter. Interesting companion to BQ25895?
Couple of things to bear in mind:
- On startup the accumulated charge register is set to midscale. Need a way to identify fully depleted battery, only indication is POR mid-scale ACR.
- I2C master required to send a repeated START condition when reading
Update: If you’re just looking for a simple 1-cell fuel gauge, algorithm based I2c IC’s such as MAX17043 are much, much easier to integrate. Get them on the cheap but tardy
Aliexpress or order directly through Maxim. Sparkfun sells a breakout and even provides a library.
Update 2: Do not get MAX17043 from Aliexpress. It took me a few hours of fault finding only to discover they were clone IC’s. The clones were detectable by I2c but do not function correctly, they just count the State Of Charge register down from 160% to 0% in a matter of minutes! If your MAX17043 is detected at I2c address 0x32 instead of 0x36 it is probably a useless clone… More info here.