AMC7812SPAPR datasheet(36/92 Pages) TI

36 / 92 page

AMC7812

SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013

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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

+150

010010110000

+100

001100100000

+50

000110010000

+25

000011001000

000000001000

000000000000

–1

111111111000

–25

111100111000

–50

111001110000

–100

110011100000

–150

101101010000

–256

100000000000

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