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TIC12400-Q1: TIC12400 for monitoring a single relay

Rafael Magedler
Prodigy 10 points

Part Number: TIC12400-Q1
Other Parts Discussed in Thread: TIC12400

I use the TIC12400 for monitoring individual relays (no matrix arrangement!).

I have configured the TIC12400 pins IN0 as "Sink" and IN10 as "Source". I want to use the "IN_STAT_COMP" register to read out whether the relay is switched or not. Is this arrangement possible to monitor a single relay?

Or does monitoring a single relay only work if

  • the TIC pin IN10 configured as "Source" and the relay contact M1 connected to GND?
  • Or the TIC pin IN0 configured as "Sink" and the relay contact M2 connected to Vs or Vbat?

 

Thank you in advance!

  • 0
    TI__Guru 74372 points

    Rafael,

    Thanks for your patience, we'll take a look at this and get back to you by Monday end of business CST.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    TI__Mastermind 36291 points

    Hi Rafael,

    It is possible to do what you are asking since this is essentially how the device's Matrix Mode works.  If you don't use Matrix mode, there may be a few things that need to be considered that may be limitations.

    First, you will likely only be able to use Continuous Current mode for the wetting current.  This is because in Polling Mode, the wetting current will be disabled for a channel once the measurement is made and therefore the IN0 channel will be disabled before IN10 and prevent the current flow through the relay.  However, in Continuous Mode, the channels stay enabled after the measurement and when the device is measuring IN10, the current will be flowing through the relay and into IN0 which is configured as a sink.

    The basic operation of the device is to source or sink current while making a voltage measurement on the INx pin.  The idea is that the resistance will change based upon the state of the switch, or relay, etc. and the voltage measurement will change accordingly.  Each INx pin is treated as an independent channel with it's own switch or relay that is connected to either Vbat or GND, but as long as there is a path for the current to flow, you can use one channel as a sink instead of directly connecting the switch or relay to GND.

    Because both INx pins are independent, you will need to use the Source channel IN10 for your actual voltage measurement when checking the comparator.

    Regards,

    Jonathan