Other Parts Discussed in Thread: BQ25155, BQ25150,
Tool/software:
This question relates to using the BQ25157 (similar to BQ25150, BQ25155) in such a way as to do ADC conversion at low power with no VIN.
The intended use case is that periodically the part will be brought out of low power by setting /LP to 1, waiting 1 ms (per datasheet to get I2C interface to work), and then manually initiating an ADC conversion. Does the processor have to wait for the ADC conversion to end before setting /LP to 0, or can the processor set /LP to 0 and the BQ25157 will finish the ADC reading, store the results, and then go to low power on its own?
Basically, can I set the ADC in motion and the part will go into low power when it is done by itself, or will setting /LP before the ADC is done cancel the ADC process?
This comes about with a use case where the processor wakes up for very short periods of time (well under 1 ms), and I don't want to keep it alive just to let a slow ADC finish. The ideal is the ADC finishes, stores the results in the registers, goes to low power. The next time the processor wakes up, it reads the registers to get the results.
Thanks.
