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nPM1100 possible to connect ISET to VOUTB

Rein G. Bentdal

In the product specification of nPM1100, for fixed 500mA charging limit, ISET should be connected to VSYS. In the USB-configuration (Configuration 3) ISET is connected to MCU GPIO, which I then assume will have a HIGH voltage of VOUTB.

Is it safe to hardwire ISET to VOUTB for setting the charging limit to fixed 500mA?

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  • +1

    Hi Rein,

    The ISET only sets the current that can be drawn from VBUS and not the charging current. S it would be better to connect the ISET to either VSYS or let the USB port detect it. This is better than selecting it along with MCU.

    The VIH is a min of 1.1V. So anything between 1.1V and SYS is detected as HIGH.

    Also, in Config3, the VOUBSET1 is grounded, so The VOUTB will be 2.1V.

    Best Regards,

    Priyanka

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  • +1

    Hi Rein,

    The ISET only sets the current that can be drawn from VBUS and not the charging current. S it would be better to connect the ISET to either VSYS or let the USB port detect it. This is better than selecting it along with MCU.

    The VIH is a min of 1.1V. So anything between 1.1V and SYS is detected as HIGH.

    Also, in Config3, the VOUBSET1 is grounded, so The VOUTB will be 2.1V.

    Best Regards,

    Priyanka

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