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BQ27530EVM: Can't limit charging current programmed into bq24161 charger

Tiago_Alves
Prodigy 20 points
Part Number: BQ27530EVM
Other Parts Discussed in Thread: BQ27530-G1, , BQ24161, BQSTUDIO

In my current project, I am using the bq27530-G1 fuel gauge as well as the bq24161 battery charger. For evaluation, I am using the bq27530EVM which comes with both parts. In order to comply with the requirements given by the battery supplier's datasheet for the charging current, it shall not exceed 0.5C which translates to about 550 mA. The bq24161 provides the “Battery Termination/Fast Charge Current Register”, which allows defining the maximum value for the charging current, ICHRG[4:0].

In my application, the configuration of this register shall be done by the fuel gauge. Even though it’s possible to watch the status of the ICHRG[4:0] bits in bqStudio (image below), there is apparently no field in the fuel gauge’s flash settings (Reg 00 to Reg 07 in Charger Info) which allows to set their value. This means that the charging current programmed into the charger will depend only on the current calculated by the algorithm, as far as I understand. Is there any way to actually define a limit for the charging current with the bq27530 fuel gauge as host for the battery charger?

  • 0
    TI__Guru* 76230 points

    hi Tiago

    the controls for the charger are in the data flash ...see attachment below:

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 20 points

    Hello Onyx,

    I might be missing something here but if you check all the charger controls, there is no option to directly set the state of the ICHRG[4:0]. I would like to have the programmed charging current limited to 550 mA. The only way I find this possible is by setting "Charge Current Tx" under "Temperature Table" to 0.5C but that requires enabling the MLC algorithm and I don't want to use it for the moment.

    Do you have any suggestion? Thank you a lot.

    Tiago