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TCA8418: TCA8418

Aleksey%20Kharinov
Prodigy 30 points
Part Number: TCA8418
Other Parts Discussed in Thread: TCA9544A

Hi! First, sorry for my English. I need to make a keyboard with ~280(!) buttons. Is it possible to use 4 x TCA8418  on one i2c bus or is there another solution? Thanks!

  • 0
    TI__Mastermind 49040 points

    Hello Aleksey,

    TCA8418 does not have an address configuration (its slave address is all static). So you cannot connect 4 of them on the same bus together in a normal configuration. It could be possible to do this if you used a switch to select between one of the four TCA8418s at a time. My recomendation would be to use TCA9544A to separate the 4 devices from the I2C line and have an ISR (interrupt service routine) to check which TCA8418 generates an INT (read TCA9544A INT registers).

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 30 points
    Thank you very much! This solves my problem!