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參數(shù)資料
| 型號： | ADM1031ARQZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 4/36頁 |
| 文件大?。?/td> | 596K |
| 代理商： | ADM1031ARQZ |
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ADM1031
Rev. B | Page 12 of 36
TEMPERATURE MEASUREMENT SYSTEM
INTERNAL MEASUREMENT
The ADM1031 contains an on-chip bandgap temperature
sensor. The on-chip ADC performs conversions on the output
of this sensor and outputs the temperature data in 10-bit twos
complement format. The resolution of the local temperature
sensor is 0.25°C. The format of the temperature data is shown
in Table 6.
EXTERNAL MEASUREMENT
The ADM1031 can measure the temperatures of two external
diode sensors or diode-connected transistors, connected to
Pins 9 and 10, and Pins 11 and 12.
These pins are dedicated temperature input channels. The
function of Pin 7 is as a THERM input/output and is used to
flag overtemperature conditions.
The forward voltage of a diode or diode-connected transistor,
operated at a constant current, exhibits a negative temperature
coefficient of about –2 mV/°C. Unfortunately, the absolute
value of VBE, varies from device to device, and individual
calibration is required to null this out. As a result, the technique
is unsuitable for mass production.
The technique used in the ADM1031 is to measure the change
in VBE when the device is operated at two different currents.
This is given by
ΔVBE = KT/q × ln (N)
where:
K is Boltzmann’s constant.
q is charge on the carrier.
T is absolute temperature in Kelvins.
N is ratio of the two currents.
Figure 19 shows the input signal conditioning used to measure
the output of an external temperature sensor. This figure shows
the external sensor as a substrate transistor, provided for
temperature monitoring on some microprocessors, but it could
equally well be a discrete transistor.
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D–
TO
ADC
LOW-PASS
FILTER
fC = 65kHz
VDD
VOUT+
VOUT–
IBIAS
IN
× I
02402-
019
Figure 19. Signal Conditioning
If a discrete transistor is used, then the collector is not
grounded, and is linked to the base. If a PNP transistor is used,
the base is connected to the D– input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D– input and the base to the D+ input.
One LSB of the ADC corresponds to 0.125°C, so the ADM1031
can theoretically measure temperatures from –127°C to
+127.75°C, although –127°C is outside the operating range for
the device. The extended temperature resolution data format is
Table 6. Temperature Data Format (Local Temperature and
Remote Temperature High Bytes)
Temperature (°C)
Digital Output
–128°C
1000 0000
–125°C
1000 0011
–100°C
1001 1100
–75°C
1011 0101
–50°C
1100 1110
–25°C
1110 0111
–1°C
1111 1111
0°C
0000 0000
+1°C
0000 0001
+10°C
0000 1010
+25°C
0001 1001
+50°C
0011 0010
+75°C
0100 1011
+100°C
0110 0100
+125°C
0111 1101
+127°C
0111 1111
Table 7. Remote Sensor Extended Temperature Resolution
Extended Resolution (°C)
Remote Temperature Low Bits
0.000
000
0.125
001
0.250
010
0.375
011
0.500
100
0.625
101
0.750
110
0.875
111
The extended temperature resolution for the local and remote
channels is stored in the extended temperature resolution
register (Register 0×06), and is outlined in Table 31.
Table 8. Local Sensor Extended Temperature Resolution
Extended Resolution (°C)
Local Temperature Low Bits
0.00
00
0. 25
01
0.50
10
0.75
11
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