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TMP112: TMP112 Read Data error

Tommy Tzeng
Genius 5460 points
Part Number: TMP112

Hi Team,

may we know what cause it? 

when reading the temperature data of TMP112, the temperture read at the first time will be wrong, the temperture at beginning of the second time will be correct. 

the data conversion temperture read by the actual measure signal is wrong, delay the read of TMP112?

0x48 (1)

0x48 (2)

0x49(1)

0x49(2)

  • 0
    TI__Mastermind 42255 points

    Hi Tommy,

    Thank you for sharing oscilloscope pictures. The first time read values are 29-30C encoded in the default 12 bit. You must be setting EM=1 in the Configuration register, and reading the last temperature measurement that was taken with EM=0. You must wait for the next measurement to complete in EM=1 (13bit) mode.

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Genius 5460 points

    Hi Ren,

    customer always set EM=1, so there should not be 12bit(EN=0) data, thanks.

    what caused it?

  • 0 in reply to Tommy Tzeng
    TI__Mastermind 42255 points

    Hi Tommy,

    As I said before, the temperature data is old. Temperature measurements are taken 4 times per second, or once every 250ms. This is configured with the CR bits in the configuration register. Please reference my drawing.

    thanks,

    ren