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ADT75ARM Datasheet(PDF) 11 Page - Analog Devices

No. de pieza ADT75ARM
Descripción Electrónicos  -1째C Accurate, 12-Bit Digital Temperature Sensor
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ADT75ARM Datasheet(HTML) 11 Page - Analog Devices

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ADT75
Rev. 0 | Page 11 of 24
Configuration register functions consist of
Switching between normal operation and full power-down.
Switching between comparator and interrupt event modes.
Setting the OS/ALERT pin active polarity.
Setting the number of faults that activate the
OS/ALERT pin.
Enabling the one-shot mode.
Enabling the SMBus alert function mode on the
OS/ALERT pin.
TEMPERATURE DATA FORMAT
One LSB of the ADC corresponds to 0.0625°C. The ADC can
theoretically measure a temperature range of 255°C (−128°C to
+127°C ), but the ADT75 is guaranteed to measure a low value
temperature limit of −55°C to a high value temperature limit of
+125°C. The temperature measurement result is stored in the
16-bit temperature value register and is compared with the high
temperature limit stored in the TOS setpoint register and the
hysteresis limit in the THYST setpoint register.
Temperature data in the temperature value register, the TOS
setpoint register and the THYST setpoint register, is represented
by a 12-bit twos complement word. The MSB is the temperature
sign bit. The four LSBs, Bit DB0 to Bit DB3, are not part of the
temperature conversion result and are always 0s. Table 6 shows
the temperature data format without Bit DB0 to Bit DB3.
Reading back the temperature from the temperature value
register requires a 2-byte read unless only a 1°C (8-bit)
resolution is required, then a 1-byte read is required. Designers
that use a 9-bit temperature data format can still use the ADT75
by ignoring the last three LSBs of the 12-bit temperature value.
These three LSBs are Bit D4 to Bit D6 in Table 6.
Table 6. 12-Bit Temperature Data Format
Temperature
Digital Output (Binary)
DB15 to DB4
Digital Output (Hex)
−55°C
1100 1001 0000
0xC90
−50°C
1100 1110 0000
0xCE0
−25°C
1110 0111 0000
0xE70
−0.0625°C
1111 1111 1111
0xFFF
0°C
0000 0000 0000
0x000
+0.0625°C
0000 0000 0001
0x001
+10°C
0000 1010 0000
0x0A0
+25°C
0001 1001 0000
0x190
+50°C
0011 0010 0000
0x320
+75°C
0100 1011 0000
0x4B0
+100°C
0110 0100 0000
0x640
+125°C
0111 1101 0000
0x7D0
Temperature Conversion Formulas
12-Bit Temperature Data Format
Positive Temperature = ADC Code(d)/16
Negative Temperature = (ADC Code(d)1− 4096)/16, or
Negative Temperature = (ADC Code(d)2 – 2048)/16
9-Bit Temperature Data Format
Positive Temperature = ADC Code(d)/2
Negative Temperature = (ADC Code(d)3 – 512)/2, or
Negative Temperature = (ADC Code(d)4 – 256)/2
8-Bit Temperature Data Format
Positive Temperature = ADC Code(d)
Negative Temperature = ADC Code(d)5 – 256, or
Negative Temperature = ADC Code(d)6 – 128
Bit DB7 (sign bit) is removed from the ADC code.
1 For ADC code, use all 12 bits of the data byte, including the sign bit.
2 For ADC code, Bit DB11 (sign bit) is removed from the ADC code.
3 For ADC code, use all 9 bits of the data byte, including the sign bit.
4 Bit DB8 (sign bit) is removed from the ADC code.
5 For the ADC code, use all 8 bits of the data byte, including the sign bit.
6 Bit DB7 (sign bit) is removed from the ADC code.


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