AMC7834 Datasheet, PDF (34/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

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)
–55
–40
–25
–10
–0.25
0
0.25
10
25
50
75
100
105
125
DIGITAL CODE
1111 0010 0100
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
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).
Positive Temperature (qC) ^Code
4
(4)
Negative Temperature (qC) ^{4096 Code}
4
(5)
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