Other Parts Discussed in Thread: BQSTUDIO
Hello all,
For some reason, some of our batteries seemed to be in shutdown mode, the FETs were off, and the OperationStatus()[SDM] was set. We think this might be a MAC shutdown.
According to the technical reference, "Charger voltage must not be present and the ENAB pin must be high for the device to enter SHUTDOWN mode". Our design was to ground the ENAB pin, so from my understanding, the battery will not be able to enter MAC shutdown. We did some testing by sending the MAC shutdown() command twice and the gauge did turn the FETs off and set the OperationStatus()[SDM] bit.
My questions are:
1. Why did the battery enter shutdown mode for no reason? We did not send the command and we permanently set the ENAB pin to low.
2. Is this actually a MAC shutdown? Because when we connect a voltage source which is greater than V_Startup and the ENAB is grounded, it did not return to NORMAL mode.
Our current solution is to fully reset the gauge. This does work but we want to know why this is happening and skip the reset process.
Thank you in advance!
Best regards,
Eric