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BQ25172: ISET pin voltage for changing charging current

Koshi Ninomiya
Expert 4690 points
Part Number: BQ25172

Tool/software:

Dear Team,

My customer is evaluating the BQ25172EVM to charge 1-cell NiMH batery (1.2V, I_charge: 500mA). When it is initial charge, the charging current need to be change at V_bat=1.1V. So, the charging current setting need to be changed by monitoring the battery voltage.

Q1: ISET pin has a external RISET. If a MCU DAC output (< V_ISET) is connected to ISET pin through a series resistor, can the charging current be changed?

Q2: What is ISET pin voltage?

Best Regards,

Koshi Ninomiya