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Part Number: BQ25120A
We met a issue to set the charge current between 50mA to 60mA,such as 55mA
But there is no choice to set 55mA in Fast Charge Control Register;
Here is the setting :
After failing to set 55mA by register,we try to set current by external resistor,and only change register BQ25120_FASTCHARGE_CTL_REG to 0xFC;
The external resistor on ISET is 3.6KR;
The external resistor on IPRETERM is 4.99KR;
Then we test the fast charge current is 55mA;
But we meet another issue that the current can not be terminated even battery reach to 4.2V;
Could you share some tips to resolve this ?
Thanks & Best Regards
It is correct that the only way to get exactly 55mA ICHG is through the external resistor setting.
When in external ISET, you also have to configure precharge current for that. Look at the footnote on page 39 of the datasheet on how to configure the precharge current register (0x04) for the precharge current you want
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