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TPS22994 schematic for I2C only interface

WAGNER A P COIMBRA
Prodigy 10 points
Other Parts Discussed in Thread: TPS22960, TPS22994

Hi!

I already used TPS22960 in previous projects and it works fine.

Now I am working in a project wich has a lot ov restrictions about board space and use of MCU pins (and I have to switch about 15 loads).

Due to this, I itend to migrate from TPS22960 to TPS22994. And I intend to use I2C interface only (no GPIO On/Off control).

In my application, on cold boot I have to start with all power outputs switched to OFF.

Firmware logic will turn power outputs ON as needed.

So, my question is if is the schematic below valid for the operation described above (I still able to program internal IC registers, even if I tie all ONx inputs to GND, correct?).

Thanks in advance.

Wagner Coimbra

  • 0
    TI__Genius 15780 points

    Hi Wagner,

    You are correct.  If the GPIO inputs are tied to ground, then the device will power up with the outputs OFF.  From the datasheet: "Each ON pin controls the state of the switch by default upon power up".  I2C can then be initialized and all 4 switches can be enabled/disabled through I2C.

    Thanks,

    Alek Kaknevicius