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BQ25895M: Reference circuit for

NIKHITHA ANTONY
Intellectual 340 points
Part Number: BQ25895M

We are currently designing a schematics for a tablet project.  USB C type charger is used for battery recharging and data transfer. And BQ25895m is used as charging IC. We are providing D+ and D- signals of USB connector directly to the Dp and Dn pins of the processor I.MX7 for data transfer. So how would be the D+ and D- lines of charging IC(BQ25895m) would terminate?

Please check and let me know.

  • 0
    TI__Guru 57541 points

    Hi,

    The D+/D- pins are used for USB input current limit detection when VBUS power is plugged in. During the charger input current limit detection process, the host must be able to HIZ D+/D- pins so that D+/D- pins are driven by the charger. If the host is unable to HIZ D+/D- pins, a USB switch is needed to isolate the host and the charger. The DSEL pin of the device can be used for  D+/D- multiplexer selection control. Please refer to the BQ25895M EVM for the sample circuitry at https://www.ti.com/lit/ug/sluuba2b/sluuba2b.pdf .

     

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Intellectual 340 points

    We added USB switch isolating USB host and charger. As per DSEL pin, In which condition  BQ25895M detect D+ and D-. During high of low condition?

    As per my understanding, when DSEL is high, BQ25895M  will detect D+ and D-. During DSEL is low, We give provision for data transfer to the processor. Kindly check and confirm this.

  • 0 in reply to NIKHITHA ANTONY
    TI__Guru 57541 points

    Hi,

    The DSEL pin drives low to indicate the charger D+/D- detection is in progress and needs to take control of D+, D- signals.

    Thanks,

    Ning.