AMC7812B_15 Datasheet, PDF (36/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
www.ti.com
The device has three temperature sensors: two remote (D1 and D2) and one on-chip (LT). If any sensor is not
used, it can be disabled by clearing the corresponding enable bit (bits D2EN, D1EN, and LTEN of the
temperature configuration register). When disabled, the sensors are not converted. The device continuously
monitors the selected temperature sensors in the background, leaving the user free to perform conversions on
the other channels. When one monitor cycle finishes, a signal passes to the control logic to automatically initiate
a new conversion.
The analog sensing signal is preprocessed by a low-pass filter and signal-conditioning circuitry, and then
digitized by the ADC. The resulting digital signal is further processed by the digital filter and processing unit. The
final result is stored in the LT-temperature-data register, the D1-temperature-data register, and the D2-
temperature-data register, respectively. The format of the final result is in twos complement, as shown in Table 2.
Note that the device measures the temperature from –40°C to +150°C.
Table 2. Temperature Data Format
TEMPERATURE (°C)
+255.875
+150
+100
+50
+25
+1
0
–1
–25
–50
–100
–150
–256
DIGITAL CODE
011111111111
010010110000
001100100000
000110010000
000011001000
000000001000
000000000000
111111111000
111100111000
111001110000
110011100000
101101010000
100000000000
36
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