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TMP275 addressing

Martin Lauterbach
Prodigy 70 points
Other Parts Discussed in Thread: TMP275

Hi,

I have a problem with addressing TMP275. When I set up all address pins to 0 (adress 0x48) sensor not acknowledge address. There is same problem with general call (adsress 0x00). Response for other combinations of address pins (0x49 ...) is good.

Can anybody tell me why?

Martin

  • 0
    TI__Guru 63905 points

    Hello Martin,

    The behavior you have described does not match what I would expect for the TMP275.  Could you please send a couple of scope captures showing a working communication sequence, for example when the part is configured for address 0x49 (A2 = 0, A1 = 0, A0 = 1)?  Then please also show the sequences that don't work such as the address 0x48 (A2 = 0, A1 = 0, A0 = 0) or general call.

    Are there other TMP275's or other I2C devices on the I2C bus while you are trying these experiments?

    Thanks,
    Collin Wells
    Linear Applications