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Can you connect multiple DS100KR800 devices' RESET inputs together and drive from a single source?

Casey Morrison
Intellectual 1985 points
Other Parts Discussed in Thread: DS100KR800

Posted on behalf of another user:

If we're running multiple DS100KR800 devices, can we connect all the resets (RESET, pin 52) together? Is there a reason we might want to run individual resets, like in case one of the devices gets locked up?

  • 0
    TI__Intellectual 1985 points

    You can certainly connect all the devices' RESET pins together and drive them from a single suitable source. Whether you would want to do this depends on your application. On a separate but related note, you can also disable individual channels of the device via the SMBus, so even if you had all devices' RESET pins connected together, you could still override that pin and write your own channel-specific RESET value via the SMBus registers. I do not see any issues/risks, however, with connecting all devices' RESET pins together.

    Regards,

    Casey

  • 0 in reply to Casey Morrison
    Prodigy 40 points

    Does powering down individual channels have the same effect as a RESET?

  • 0 in reply to Cory Jung
    TI__Intellectual 1985 points

    Hi Cory,

    Yes. Keep in mind that RESET will reset all channels, while in the SMBus registers you can reset individual channels. The register contents are preserved even when RESET is asserted high, provided you are in SMBus mode (ENSMB=1).

    Another form of reset which is available is the SMBus register reset, which is triggered by writing 0x01 to register 0x00. This bit is self-clearing, but it will reset all the SMBus registers in the device to their default state.

    Casey