AMC7832 Datasheet, PDF (36/70 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

AMC7832
SLAS836 – MARCH 2014
www.ti.com
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)
-40
-25
-10
-0.25
0
+0.25
+10
+25
+50
+75
+100
+105
+125
DIGITAL CODE
1111 0110 0000
1111 1001 1100
1111 1101 1000
1111 1111 1111
0000 0000 0000
0000 0000 0001
0000 0010 1000
0000 0110 0100
0000 1100 1000
0001 0010 1100
0001 1001 0000
0001 1010 0100
0001 1111 0100
If the output data MSB is ‘0’, the temperature can be calculated by,
Positive Temperature(°C) = ^ADC_Code
4
(3)
Negative Temperature(°C) = ^{4096 - ADC_Code}
4
(4)
36
Submit Documentation Feedback
Product Folder Links: AMC7832
Copyright © 2014, Texas Instruments Incorporated