The bq35100 Battery Fuel Gauge
and End-Of-Service Monitor provides highly configurable fuel gauging for non-rechargeable (primary)
lithium batteries without requiring a forced discharge of the battery. Built so that optimization
is not necessary to achieve accurate gauging, the bq35100 device uses patented TI gauging
algorithms to support the option to seamlessly replace an old battery with a new one.
The bq35100 device provides accurate results with ultra-low average
power consumption where less than 2 µA can be achieved through host control via the GAUGE ENABLE
(GE) pin. The device is only required to be powered long enough, at a system-determined update
frequency, to gather data and to make calculations to support the selected algorithm. A typical
system may need to only be updated once every 8 hours as the gauge is not required to be powered to
measure all discharge activity.
The fuel gauging functions use voltage, current, and temperature
measurements to provide State-Of-Health (SOH) data and End-Of-Service (EOS) warning information
where the host can read the gathered data through a 400-kHz I2C bus. An
ALERT output, based on a variety of configurable status and data options, is also available to
interrupt the host.
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