AMC7836IPAP datasheet(36/88 Pages) TI1

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4096

ADC _ Code

Negative Temperature ( C)

ADC _ Code

Positive Temperature ( C)

AMC7836

SLAS986C – NOVEMBER 2014 – REVISED APRIL 2016

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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

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)

DIGITAL CODE

–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 3 and Equation 4 to calculate the positive or negative temperature according to the polarity of the

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

(3)

(4)

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