AMC7834 datasheet(34/97 Pages) TI2

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4096

Code

Negative Temperature ( C)

Code

Positive Temperature ( C)

AMC7834

SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016

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7.3.3 Temperature Sensors

The AMC7834 device includes one on-chip and two remote temperature sensors. The temperature sensors

monitor the three temperature inputs. The on-chip integrated temperature sensor measures the device

temperature and two remote diode-sensor inputs measure two external temperature points. All three

temperature-sensor results are converted by the device ADC and stored in two’s complement format. If any

sensor is not used, it can be disabled in the register configuration. When any of the temperature sensors is

disabled it is not converted by the ADC.

7.3.3.1 Internal Temperature Sensor

The AMC7834 device has an on-chip temperature sensor that measures the device die temperature. The

temperature-sensor results are converted by the device ADC (see the Analog-to-Digital Converter (ADC) section

for more information). If internal temperature sensor conversion is not needed, it can be disabled in the ADC

MUX register (address 0x12). When disabled the temperature sensor output is not converted by the ADC.

The temperature sensor provides 0.25°C resolution over the device operating temperature range. Additionally,

the AMC7834 internal temperature sensor is specified monotonic down to –55°C. The temperature value is

stored in 12-bit two’s complement format in the LT-data register (address 0x2D).

Table 3. Temperature Sensor Data Format

TEMPERATURE (°C)

DIGITAL CODE

–55

1111 0010 0100

–40

1111 0110 0000

–25

1111 1001 1100

–10

1111 1101 1000

–0.25

1111 1111 1111

0000 0000 0000

0.25

0000 0000 0001

0000 0010 1000

0000 0110 0100

0000 1100 1000

0001 0010 1100

100

0001 1001 0000

105

0001 1010 0100

125

0001 1111 0100

Use Equation 4 and Equation 5 to calculate the positive or negative temperature according to the polarity of the

temperature data MSB (0 = positive, 1 = negative).

(4)

(5)

AMC7834 Datasheet(PDF) 34 Page - Texas Instruments

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