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TPS65987D: Support for 12V only?

Hans
Genius 12865 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TPS25750

Hello Team,

is the following scenario supported by TPS65987D or TPS25750:

- device negotiates with the host to provide 12V for charging

- if host is a 5V charger the device will ignore it and not charge.

- only 12V charger will be accepted by the device!

Thanks and Best Regards,

Hans

  • 0
    TI__Mastermind 30000 points

    Hi Hans,

    Is there a local MCU on the system that can communicate with the PD controller using I2C?

  • 0 in reply to Adam Mc Gaffin
    TI__Genius 12865 points

    Hi Adam, the only communication between charger and device is via the Channel Configuration pins. The device which asks for 12V has a uC.

    Is that what you were asking?

    Thanks and Best Regards, Hans

  • 0 in reply to Hans
    TI__Mastermind 30000 points

    Yes, my question is if the system that will use the TPS65987D or TPS25750 has an MCU that can communicate via I2C to either the TPS65987D or TPS25750

  • 0 in reply to Adam Mc Gaffin
    TI__Genius 12865 points

    Hi Adam,

    sure, the device which should be charged has an MCU with I2C!

    Thanks and Best Regards,

    Hans

  • 0 in reply to Hans
    TI__Mastermind 30000 points

    Hi Hans,

    Thank you for the confirmation. For this scenario you will need to use the TPS65987D. 

    You will have the sink capabilities set to where a maximum of 12V can be negotiated. Next, using the configuration tool, go to register 0x27 and change your sink power path to where it is configured for Sink (input), but will wait for SYS_RDY (SRDY) command. What this configuration does is that it the PD controller will still go through the process of negotiating a sink contract, but will not close the relevant power path until the SRDY command is received. This is where the MCU interaction is needed.

    Once a device is connected and a contract has been negotiated, the MCU will need to read register 0x34 which is the Active Contract PDO Register. When the MCU reads that a 12V sink contract has been negotiated, it will then send the SRDY command which will close the power path.

    This is the only way that the PD controller can close its power path for only a 12V contract