Hello:
During the testing of charging overvoltage during the use of BQ76952 in a project of our company, it was found that,
(1) Overvoltage protection process: BQ76952 has been configured for protection to occur after 1 second of overvoltage, and the configuration value read from the software is also 1 second. It was found that the actual protection time is usually around 1 second, which is normal in most cases. However, multiple tests occasionally require protection for around 2 seconds, with a high probability of occurrence
(2) Overvoltage protection recovery process: The BQ76952 parameter is configured with an overvoltage recovery time of 1 second, but the configuration value read from the software is 2 seconds. However, the actual recovery time obtained through multiple measurements actually reaches around 3.6 seconds
The measured waveform is shown in the following figure
(Cell overvoltage and overvoltage recovery, with a recovery time of 3.6 seconds)
In response to this situation, please refer to the specification and two key parameters have been correctly set as
May I ask, what is the possible cause of the above phenomenon? How to solve it? Thank you!