BQ2476x Input Current Limit

Jeremy51164

Other Parts Discussed in Thread: BQ24725A

Hello,

I am working towards a (non-host) smart battery with integrated charger, firstly using the bq20z65EVM and the BQ2476x EVM and have used SLUA533 as a guide. I would like to use the Input Current limit feature provided by the charger, but want to avoid having to use a host. I understand that the InputCurrentLimit register is volatile and defaults to 256mA when reset. Is it possible to have the coulomb counter configure the charger using a broadcast, (like the charge current and voltage), or will I need to add a host?

Thank you,

Jeremy.

over 11 years ago

0 Wang5577 over 11 years ago

TI__Guru 56650 points

bq24725A has a default 4096mA input current limit with 10mohm sense resistor.
Please check the following app notes: http://www.ti.com/lit/an/slua608/slua608.pdf

Thanks,
Wang

0 Jeremy51164 over 11 years ago in reply to Wang5577

Intellectual 780 points

Thanks - that may be a more suitable part if I don't end up adding a microcontroller, however, I was wondering if there is a way to program the coulomb counter to broadcast a pair of arbitrary bytes to (in this case) program the InputCurrentLimit register on the charger. I suppose another option may be to simply decrease the Rac sense resistor value.

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BQ2476x Input Current Limit