AMC7832IPAP datasheet(36/74 Pages) TI2

36 / 74 page

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4096 - ADC_Code

Negative Temperature °C =

( )

ADC_Code

Positive Temperature °C =

AMC7832

SLAS836 – MARCH 2014

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8.3.3 Internal Temperature Sensor

The AMC7832 has an on-chip temperature sensor used to measure 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. 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 (refer to the ADC section for more details). If the

temperature sensor is not needed, it can be disabled in the ADC MUX Configuration 2 register (address 0x15).

By default the temperature sensor is disabled and not converted by the ADC.

The temperature sensor gives 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 – 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

+10

0000 0010 1000

+25

0000 0110 0100

+50

0000 1100 1000

+75

0001 0010 1100

+100

0001 1001 0000

+105

0001 1010 0100

+125

0001 1111 0100

If the output data MSB is ‘0’, the temperature can be calculated by,

(3)

(4)

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