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INA233: Trigger multiple INA233 at same time

Tiemo Schoettke1
Prodigy 211 points
Part Number: INA233


Hello,

Is it possible to trigger a single-shot conversion for multiple devices (different slave addresses) at the same time?

Datasheet is saying that I need to write in MFR_ADC_CONFIG to trigger a measurement, but I can do this only for one device at a time only, can I? Or is there a kind of  PMBUS global command for it which I cannot find in the datasheet?

If this is not possible, does TI have a similar device that supports an external trigger?


Thanks and best regards

Tiemo 

  • 0
    TI__Mastermind 35300 points

    Hi Tiemo,

    INA233 supports PMBus group protocol. You should be able to program all INA233 devices in one transaction for a triggered conversion with this protocol.
    The detail of the group command is attached for your convenience.

    We currently don’t have a similar device with an external trigger pin.

    Regards, Guang

    GroupCommands.pdf

  • 0 in reply to Guang Zhou
    TI__Prodigy 211 points

    Hi Guang,

    thank you for your reply.

    Unfortunately there is nothing about a group trigger listed. The only way to trigger a single-shot conversion is to address each device and write the MFR_ADC_CONFIG register. Is that right? There is no single global slave address to trigger a measurement, is it?

    Regards, TIemo

  • 0 in reply to Tiemo Schoettke1
    TI__Mastermind 35300 points

    Hi TIemo,

    The data sheet points it out in this section:

    For the command implementation, please refer to PMBus specification. The file attached in my previous post contains the relevant pages. But you’re welcome to look up the entire document widely available online.

    Regards, Guang