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TMP112 address pin

Martin Dusek11
Prodigy 180 points
Other Parts Discussed in Thread: TMP112

Is it possible to connect TMP112 address pin to MCU GPIO and set low or high on that pin during TMP112 operation (so the device will then respond to 1001000, resp. 1001001 address)?

I need to sequentially gather data from 20 TMP112 on a single I2C bus.

  • 0
    TI__Mastermind 43715 points

    Hi Martin,

    Yes, it is possible to control the ADD0 pin with an MCU pin. It would not be possible to access the third and fourth address options (see page 12 of datasheet) this way, but it should not be needed for the usage case you've described. I would recommend communicating with the device that has its ADD0 held LOW while the rest are held HIGH. The device will detect the state of the ADDR0 pin each time an I2C transaction is initiated, so the pin should be allowed to setup and stabilize well before the transaction begins.

    Ren