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TMP461: Lower byte at negative temperature

Danilo A.
Mastermind 24705 points
Part Number: TMP461

Hi Team,

We would like to ask your help regarding our customer's inquiry below

When a temperature reading is negative, how are the Lower Byte supposed to be interpreted? Am I to assume it is always a positive offset? If not, then there seems to be a gap between -1degC and 0degC

Regards,

Danilo

  • 0
    TI__Mastermind 35855 points

    Hi Danilo,

    Please refer to this table and let me know if you have further questions. This is all codes between -1.5C and 1.5C for Standard Range. The lower byte is decoded the same way for Extended Range.

    Register Contents 12 bit unsigned integer 12 bit signed integer Temperature
    FE80 4072 -24 -1.5
    FE90 4073 -23 -1.4375
    FEA0 4074 -22 -1.375
    FEB0 4075 -21 -1.3125
    FEC0 4076 -20 -1.25
    FED0 4077 -19 -1.1875
    FEE0 4078 -18 -1.125
    FEF0 4079 -17 -1.0625
    FF00 4080 -16 -1
    FF10 4081 -15 -0.9375
    FF20 4082 -14 -0.875
    FF30 4083 -13 -0.8125
    FF40 4084 -12 -0.75
    FF50 4085 -11 -0.6875
    FF60 4086 -10 -0.625
    FF70 4087 -9 -0.5625
    FF80 4088 -8 -0.5
    FF90 4089 -7 -0.4375
    FFA0 4090 -6 -0.375
    FFB0 4091 -5 -0.3125
    FFC0 4092 -4 -0.25
    FFD0 4093 -3 -0.1875
    FFE0 4094 -2 -0.125
    FFF0 4095 -1 -0.0625
    0000 0 0 0
    0010 1 1 0.0625
    0020 2 2 0.125
    0030 3 3 0.1875
    0040 4 4 0.25
    0050 5 5 0.3125
    0060 6 6 0.375
    0070 7 7 0.4375
    0080 8 8 0.5
    0090 9 9 0.5625
    00A0 10 10 0.625
    00B0 11 11 0.6875
    00C0 12 12 0.75
    00D0 13 13 0.8125
    00E0 14 14 0.875
    00F0 15 15 0.9375
    0100 16 16 1
    0110 17 17 1.0625
    0120 18 18 1.125
    0130 19 19 1.1875
    0140 20 20 1.25
    0150 21 21 1.3125
    0160 22 22 1.375
    0170 23 23 1.4375
    0180 24 24 1.5

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    TI__Mastermind 24705 points

    Hi Ren,

    Thank you very much for this table. It resolves the customer's concern.

    Regards,

    Danilo