Datasheet

AMC7812
SBAS513E –JANUARY 2011–REVISED SEPTEMBER 2013 www.ti.com
The AMC7812 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 Temp
Configuration Register). When disabled, the sensors are not converted. The AMC7812 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) DIGITAL CODE
+255.875 011111111111
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0 000000000000
–1 111111111000
–25 111100111000
–50 111001110000
–100 110011100000
–150 101101010000
–256 100000000000
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