参数资料
型号: ADT7463ARQZ-REEL
厂商: ON Semiconductor
文件页数: 18/50页
文件大小: 726K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
标准包装: 2,500
系列: dBCool®
功能: 风扇控制,温度监控器
传感器类型: 内部和外部
感应温度: -40°C ~ 120°C,外部传感器
精确度: ±1.5°C(最小值)
拓扑: ADC,比较器,风扇速度计数器,多路复用器,寄存器库
输出类型: SMBus?
输出警报:
输出风扇:
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 120°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
供应商设备封装: 24-QSOP
包装: 带卷 (TR)
ADT7463
http://onsemi.com
18
Figure 24 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    temperature    monitoring    on    some
microprocessors. It could equally well be a discrete
transistor, such as a 2N3904.
Figure 24. Signal Conditioning for Remote Diode Temperature Sensors
LOWPASS FILTER
f
C
 = 65 kHz
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D
V
DD
I
BIAS
I
N ?I
V
OUT+
V
OUT
To ADC
THERMDA
THERMDC
CPU
If a discrete transistor is used, the collector will not be
grounded and should be 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. Figures 25 and 26 show how to connect the ADT7463
to an NPN or PNP transistor for temperature measurement.
To prevent ground noise from interfering with the
measurement, the more negative terminal of the sensor is not
referenced to ground but is biased above ground by an
internal diode at the D input.
To measure DV
BE
, 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 and
to a chopperstabilized amplifier that performs the
functions of amplification and rectification of the waveform
to produce a dc voltage proportional to DV
BE
. This voltage
is measured by the ADC to give a temperature output in
10bit, twos complement format. To further reduce the
effects of noise, digital filtering is performed by averaging
the results of 16 measurement cycles. A remote temperature
measurement takes nominally 25.5 ms. The results of
remote temperature measurements are stored in 10bit, twos
complement format, as illustrated in Table 16. The extra
resolution for the temperature measurements is held in the
Extended Resolution Register 2 (Reg. 0x77). This gives
temperature readings with a resolution of 0.25癈.
Figure 25. Measuring Temperature by Using an NPN
Transistor
ADT7463
D+
D
2N3904
NPN
Figure 26. Measuring Temperature by Using a PNP
Transistor
ADT7463
D+
D
2N3906
PNP
Table 16. TEMPERATURE DATA FORMAT
Temperature
Digital Output (10bit)
(Note 1)
128癈
1000 0000 00
125癈
1000 0011 00
100癈
1001 1100 00
75癈
1011 0101 00
50癈
1100 1110 00
25癈
1110 0111 00
10癈
1111 0110 00
0癈
0000 0000 00
+10.25癈
0000 1010 01
+25.5癈
0001 1001 10
+50.75癈
0011 0010 11
+75癈
0100 1011 00
+100癈
0110 0100 00
+125癈
0111 1101 00
+127癈
0111 1111 00
1.  Bold numbers denote 2 LSBs of measurement in the Extended
Resolution Register 2 (0x77) with 0.25癈 resolution.
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