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TPS65987D: Sharing EEPROM with multiple TPS65987D

Darren Jenkins
Genius 11786 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65988

TPS65987D support,

Is it possible to share one EEPROM between multiple TPS65987D (there are multiple on a board) by sequentially holding them in reset as each one is configured?  So before a device is programmed (reads the EEPROM), it would be held in reset.  Then after it is programmed (reads the EEPROM), I think it would need to tristate its SPI pins so the other TPS65987D can drive the pins.

Thanks,
Darren

 

  • 0
    TI__Mastermind 29995 points

    Hello Darren,

    Unfortunately you need a EEPROM for each TPS65987D. However, instead of using two TPS65987D for two type c ports, you can use a TPS65988 as long as the Type-C ports are close to one another

  • 0 in reply to Adam Mc Gaffin
    TI__Genius 11786 points

    Hi Adam,

    Thanks for the feedback.  Can you let me know a little more?  For example, is the TPS65987D actively writing to the EEPROM during operation, so each one needs unique memory space?

    Thanks,

    Darren

  • 0 in reply to Darren Jenkins
    TI__Mastermind 29995 points

    No it only reads from the EEPROM during initial startup to load the configuration and firmware base image. What you described in your initial post could work, but I have never seen a system implement this type of architecture so I can not confidently state that it will work, so I recommend following the standard use case where a EEPROM is reserved for each PD controller.