參數(shù)資料
型號(hào): ADT7473ARQZ-1REEL
廠商: ANALOG DEVICES INC
元件分類(lèi): 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝: ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁(yè)數(shù): 8/72頁(yè)
文件大?。?/td> 1494K
代理商: ADT7473ARQZ-1REEL
ADT7473/ADT7473-1
Rev. C | Page 16 of 72
Table 10. Twos Complement, Temperature Data Format
Temperature
Digital Output (10-Bit)1
–128°C
1000 0000 00 (diode fault)
–63°C
1100 0001 00
–50°C
1100 1110 00
–25°C
1110 0111 00
–10°C
1111 0110 00
0°C
0000 0000 00
10.25°C
0000 1010 01
25.5°C
0001 1001 10
50.75°C
0011 0010 11
75°C
0100 1011 00
100°C
0110 0100 00
125°C
0111 1101 00
127°C
0111 1111 00
1 Bold numbers denote 2 LSBs of measurement in the Extended Resolution
Register 2 (0x77) with 0.25°C resolution.
Table 11. Extended Range, Temperature Data Format
Temperature
Digital Output (10-Bit)1
–64°C
0000 0000 00 (diode fault)
–63°C
0000 0001 00
–1°C
0011 1111 00
0°C
0100 0000 00
1°C
0100 0001 00
10°C
0100 1010 00
25°C
0101 1001 00
50°C
0111 0010 00
75°C
1000 1001 00
100°C
1010 0100 00
125°C
1011 1101 00
191°C
1111 1111 00
1 Bold numbers denote 2 LSBs of measurement in the Extended Resolution
Register 2 (0x77) with 0.25°C resolution.
Remote Temperature Measurement
The ADT7473/ADT7473-1 can measure the temperature of two
remote diode sensors or diode-connected transistors connected
to Pin 10 and Pin 11 or to Pin 12 and Pin 13.
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 calibra-
tion is required to null this out, so the technique is unsuitable
for mass production. The technique used in the ADT7473/
ADT7473-1 is to measure the change in VBE when the device
is operated at three different currents. This is given by
ΔVBE = kT/q × ln(N)
where:
k is Boltzmann’s constant.
T is the absolute temperature in Kelvin.
q is the charge on the carrier.
N is the ratio of the two currents.
Figure 26 shows the input signal conditioning used to measure
the output of a remote temperature sensor. This figure shows
the external sensor as a substrate transistor, provided for temp-
erature monitoring on some microprocessors. It could also be a
discrete transistor such as a 2N3904/2N3906.
0
468
6-
0
23
D+
VDD
TO ADC
VOUT+
VOUT–
REMOTE
SENSING
TRANSISTOR
D–
I
N1 × I
N2 × I
IBIAS
LPF
fC = 65kHz
Figure 26. Signal Conditioning for Remote Diode Temperature Sensors
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