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TSP65921 USB charge pump

Sergey Chub
Intellectual 400 points
Other Parts Discussed in Thread: DM3725

Hello.

This is more of a general question concerning the operation of the USB OTG. Can you provide more specifics on the internal operation of the PMIC's internal USB circuitry? For example, how does PMIC resolve collisions between the CP voltage and the voltage on VBUS supplied by the remote host? What should be done to route the CP voltage to the VBUS pin of the PMIC? Can this voltage be used to supply a 5.0V level for various purposes (i.e., setting the rail for I2C communications with an IC whose logic is powered with 5.0)?

Thank you in advance

  • 0
    TI__Expert 6090 points

    Sergery,

    votage can be used for any purpose but we need to make sure that we are in the compliance with the load requirements . when the host is pluggesd PMIC detects what state it is in, if 5V need to be generated by PMIC or recieved by PMIC, there is full detection protocol happens.

  • 0 in reply to Puneet Sehgal
    Intellectual 400 points

    Hello, Sir.


    Thank you for your reply. I have a couple more questions. How does the processor side OTG controller manages VBUS charge pump on the PMIC side? I know from the PMIC's datasheet that there are registers dedicated to that effect which are accessible via dedicated I2C (I2C4 for DM3725). But this I2C is handled exclusively by the PRCM. ULPI is mastered by the PMIC's USB module, so there is no options there. Frankly, I'm kind of new to USB, and I'm not sure how to tackle it most efficiently. If you could just help me out with some references or guidelines, I would really appreciate it.

    Thank you in advance