AMC7836_15 Datasheet, PDF (36/87 Pages) Texas Instruments – AMC7836 High-Density, 12-Bit Analog Monitor and Control Solution With Multichannel ADC, Bipolar DACs, Temperature Sensor, and GPIO Ports

AMC7836
SLAS986B – NOVEMBER 2014 – REVISED FEBRUARY 2015
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7.3.3 Internal Temperature Sensor
The AMC7836 device has an on-chip temperature sensor that measures the device die temperature. The normal
operating temperature range for the internal temperature sensor is limited by the operating temperature range of
the device (–40°C to 125°C).
The temperature sensor results are converted by the device ADC at a lower speed than the analog input
channels. The temperature can be monitored either continuously or as a single-time conversion depending on
whether the ADC is configured in auto mode or direct mode (see the Analog-to-Digital Converter (ADC) section
for more details). If the temperature sensor is not needed, it can be disabled in the ADC MUX configuration 2
register (address 0x15). When disabled, the temperature sensor output is not converted by the ADC.
The temperature sensor provides 0.25°C resolution over the operating temperature range. The temperature
value is stored in 12-bit two’s complement format in the temperature data registers (address 0x78 through 0x79).
Table 3. Temperature Sensor Data Format
TEMPERATURE (°C)
–40
–25
–10
–0.25
0
0.25
10
25
50
75
100
105
125
DIGITAL CODE
1111 0110 0000
1111 1001 1100
1111 1101 1000
1111 1111 1111
0000 0000 0000
0000 0000 0001
0000 0010 1000
0000 0110 0100
0000 1100 1000
0001 0010 1100
0001 1001 0000
0001 1010 0100
0001 1111 0100
Use Equation 3 and Equation 4 to calculate the positive or negative temperature according to the polarity of the
temperature data MSB (0 - positive, 1 - negative).
Positive Temperature (GC)  ^{ADC _ Code}
4
(3)
Negative Temperature (GC)  ^{4096 ADC _ Code}
4
(4)
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