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TIC12400-Q1: Looking for an alternative with fewer features

Yan Sidronio
Prodigy 10 points
Part Number: TIC12400-Q1
Other Parts Discussed in Thread: SN74HCS165

I was looking at the TIC12400-Q1 for a project where there are 24 simple switches. All I'm interested in is getting an alarm bit if 2 or more switches are active. If 0 or 1 switch is active, no alarm. Asynchronous would be best since as soon as a 2nd (or more) switches are active, I need the system to fault and stop. A hardware solution that requires no software would be preferred. Any suggestions?

  • 0
    TI__Genius 13640 points

    Hi Yan,

    To implement this using just logic, you would need an unpractical amount of gates (100>). I don't think there's a viable solution here that wouldn't involve using a microcontroller since you have 24 switches. My suggestion would be to connect 3 8-Bit Parallel-Load Shift Registers (SN74HCS165) to the switches and then have the microcontroller read the values from the shift registers.

    Regards,

    Sebastian