參數(shù)資料
型號(hào)： ADM1031ARQZ-R7
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, QSOP-16
文件頁(yè)數(shù)： 2/30頁(yè)
文件大小： 299K
代理商： ADM1031ARQZ-R7
ADM1031
http://onsemi.com
10
Figure 18. Signal Conditioning
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D–
TO
ADC
LOWPASS
FILTER
fC = 65kHz
VDD
VOUT+
VOUT–
IBIAS
IN × I
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 shown in Table 3 and Table 4.
Table 2. Temperature Data Format (Local
Temperature and Remote Temperature High Bytes)
Temperature (5C)
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 3. Remote Sensor Extended Temperature
Resolution
Extended Resolution
Remote Temperature Low Bits
0.000°C
000
0.125°C
001
0.250°C
010
0.375°C
011
0.500°C
100
0.625°C
101
0.750°C
110
0.875°C
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 27.
Table 4. Local Sensor Extended Temperature
Resolution
Extended Resolution
Local Temperature Low Bits
0.00°C
00
0.25°C
01
0.50°C
10
0.75°C
11
To prevent ground noise interfering with the
measurement, the more negative terminal of the sensor is not
referenced to ground, but biased above ground by an internal
diode at the D– input. If the sensor is used in a very noisy
environment, a capacitor of value up to 1000 pF can be
placed between the D+ and D– inputs to filter the noise.
To measure
DVBE, the sensor is switched between
operating currents of I and N
× I. The resulting waveform is
passed through a 65 kHz lowpass filter to remove noise,
then to a chopperstabilized amplifier that performs the
functions of amplification and rectification of the waveform
to produce a dc voltage proportional to
DVBE. This voltage
is measured by the ADC to give a temperature output in
11bit twos complement format. To further reduce the
effects of noise, digital filtering is performed by averaging
the results of 16 measurement cycles. An external
temperature measurement nominally takes 9.6 ms.
Layout Considerations
Digital boards can be electrically noisy environments and
care must be taken to protect the analog inputs from noise,
particularly when measuring the very small voltages from a
remote diode sensor. The following precautions should be
taken:
1. Place the ADM1031 as close as possible to the
remote sensing diode. Provided that the worst
noise sources such as clock generators,
data/address buses, and CRTs are avoided, this
distance can be 4 to 8 inches.
2. Route the D+ and D– tracks close together, in
parallel, with grounded guard tracks on each side.
Provide a ground plane under the tracks if possible.
3. Use wide tracks to minimize inductance and
reduce noise pickup. Ten mil track minimum
width and spacing is recommended.
Figure 19. Arrangement of Signal Tracks
10MIL
GND
D+
GND
D–
10MIL
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