Dear Sir or Madam,
we use the BQ24735 as a charger for our battery and it works so far. We can set the charger over SMBus and charge the battery.
Because we find no information in the registers for reading out the state of the charger (charging, charge complete, abnormal state..), we want to use the ACOK signal (together with the IOUT) to determine the actual state. Did we miss something?
The ACOK pin goes directly to an input of a microcontroller, pulled up to 3.3V with a 10k resistor.
Now the problem: The BQ24735 pulls the ACOK low even though the BQ24735 is charging and working fine. When I measure the voltage at this pin it is between 40mV and 285mV depending on the PCB.
I also measured this conditions:
ACDET = 2.7V
REGN = 6V
VCC = 18.9V
SRN = 14.5V
Does anyone has an idea what's going on with the ACOK?
I would appreciate any ideas.
Thank you and best regards,
Thorsten