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ADT7301 数据表(PDF) 11 Page - Analog Devices

部件名 ADT7301
功能描述  13-Bit, Digital Temperature Sensor
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制造商  AD [Analog Devices]
网页  http://www.analog.com
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ADT7301 数据表(HTML) 11 Page - Analog Devices

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ADT7301
Rev. B | Page 10 of 16
TEMPERATURE VALUE REGISTER
The temperature value register is a 14-bit read-only register that
stores the temperature reading from the ADC in 13-bit twos
complement format plus a sign bit. The MSB (DB13) is the sign
bit. The ADC can theoretically measure a 255°C temperature
span. The internal temperature sensor is guaranteed to a low
value limit of −40°C and a high limit of +150°C. The temperature
data format is shown in Table 5, which shows the temperature
measurement range of the device (−40°C to +150°C). The
typical performance curve is shown in Figure 11.
Table 5. Temperature Data Format
Temperature
Digital Output DB13 … DB0
−40°C
11, 1011 0000 0000
−30°C
11, 1100 0100 0000
−25°C
11, 1100 1110 0000
−10°C
11, 1110 1100 0000
−0.03125°C
11, 1111 1111 1111
0°C
00, 0000 0000 0000
+0.03125°C
00, 0000 0000 0001
+10°C
00, 0001 0100 0000
+25°C
00, 0011 0010 0000
+50°C
00, 0110 0100 0000
+75°C
00, 1001 0110 0000
+100°C
00, 1100 1000 0000
+125°C
00, 1111 1010 0000
+150°C
01, 0010 1100 0000
Temperature Conversion Equations
Positive Temperature = ADC Code(d)/32
Negative Temperature = (ADC Code(d)1 − 16384)/32
Negative Temperature = (ADC Code(d)2 − 8192)/32
–40°C
–0.03125°C
–30°C
11, 1111, 1111, 1111
11, 1100, 0100, 0000
11, 1011, 0000, 0000
TEMPERATURE (°C)
75°C
150°C
01, 0010, 1100, 0000
00, 1001, 0110, 0000
00, 0000, 0000, 0001
Figure 13. Temperature-to-Digital Transfer Function
1 ADC code uses all 14 bits of the data byte, including the sign bit.
2 DB13 (the sign bit) is removed from the ADC code.


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