The STC3105 battery monitor includes the hardware functions required to implement a low-cost gas gauge for battery monitoring. The STC3105 uses accurate measurements of the battery voltage to estimate a battery’s state-of-charge (SOC). It uses a low cost sense resistor to precisely sense the charge or discharge states, detect light-load conditions without ambiguity for voltage measurements, and accurate SOC calculation. The coulomb counter method is used for SOC tracking in high-load conditions.
An alarm output signals a low SOC condition, and can also indicate low battery voltage. The alarm threshold levels are programmable.
The device is programmable through an I2C interface.
- 0.5% accuracy battery voltage monitoring
- Low battery alarm output with programmable thresholds
- Low power: 60 μA in power-saving mode, 2 μA max in standby mode
- Ideal for implementation of robust gas gauge systems using open-circuit voltage and coulomb counter methods
- Small 3x2 mm package