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Original question:

TPS25750: Using USB type C Port as PD sink 100W , USB3.0 Gen 1 and PD source 15W

TPS25750: Multiple in 1 system

pdiddymac
Intellectual 450 points

Part Number: TPS25750
Other Parts Discussed in Thread: TIDA-050047, BQ25792, , TPS65987D

Hi, I'm thinking of using 3 of these to control USB C ports with the BQ25792 like in the TIDA-050047.  However, I'd like 3 USB-C ports to sink 20V at 3A and 5V source DRP.  Can I have them all share the BQ power path and rely on the OV/UV detection to prevent the power path opening if there is one already supplying power?

  • 0
    TI__Mastermind 34411 points

    This will not be possible if you want to allow the TPS25750 to control the charger in this configuration.  

    This TPS25750 does not support multi-master I2C and does not have the ability to allow 3 TPS25750 to control one BQ25792.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Intellectual 450 points

    Thanks Chuck!  That's a bummer though.  Any recommendation on how to control the BQ25792 with 3 inputs like I mentioned?  My design I have already built has the TPS65987D so I was thinking of swapping for the TPS25750 to get the wider operating temperature and the control of a BQ part.

  • 0 in reply to pdiddymac
    TI__Mastermind 34411 points

    If you have a MCU in your system, then you may be able to use I2C repeaters with a disable option or an analog switch to disable 2 of the 3 paths depending on which one is selected. 

    You would have to disable to input paths on the ports that are not connected and only allow the first device connected to own the I2C bus and the power path.  

    It will be very complex from a software management perspective.