Description

The TIDA00255 reference design utilizes the bq76940 analog front end (AFE) IC.  It measures cell voltages: and die temperature or external thermistor voltage using a 14 bit ADC.  Current is measured separately by a separate 16 bit coulomb counter.  The design can turn off low side power FETs to stop discharge or charge based on selected hardware limits.  A microcontroller not included in this design would be part of the battery controller to communicate to the AFE to set protection thresholds: turn on the power FETs: provide fault recovery and turn off the FETs for over or under temperature conditions.  A battery controller design may contain other features  which are not part of this reference design such as secondary over voltage protection: gauging: and isolated communication to let the system know the state of the battery.