Design Support

 

The bq769x0 monitor family provides a complete solution of monitoring and protection for battery voltage and current related faults, but also protects the battery system by self-monitoring for internal hardware faults. There are high-availability applications, such as in a drone battery management system, where this unexpected FET turn off is undesirable. In such applications, faults like XREADY, which are caused by an internal hardware fault but turns off the power FETs, are undesirable. This document covers an example how one might add additional conditions to faults, such as XREADY in the bq76930 and bq76940, and presents design considerations to help designers implement them.