參數(shù)資料
型號： ADM1029ARQZ-R7
廠商： ON Semiconductor
文件頁數(shù)： 11/50頁
文件大?。?/td> 402K
描述： IC SENSOR 2TEMP/FAN CTRL 24QSOP
產(chǎn)品變化通告： QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標準包裝： 1,000
功能： 風扇控制，溫度監(jiān)控器
傳感器類型： 內(nèi)部和外部
感應(yīng)溫度： 0°C ~ 100°C，外部傳感器
精確度： ±1°C 本地，±3°C 遠程
拓撲： ADC，風扇控制，寄存器庫
輸出類型： 開路漏極
輸出警報： 是
輸出風扇： 是
電源電壓： 3 V ~ 5.5 V
工作溫度： 0°C ~ 100°C
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 24-QSOP
包裝： 帶卷 (TR)
ADM1029
http://onsemi.com
11
provided    for    temperature    monitoring    on    some
microprocessors, but it could equally well be a discrete
transistor.
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.
Figure 21. Signal Conditioning for Remote Diode Temperature Sensors
LOW-PASS 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
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 noisy
environment, a capacitor of value up to 1000 pF may be
placed between the D+/D pins.
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 low-pass filter to remove noise, and
to a chopper-stabilized 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 8-bit
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 takes nominally 9.6 ms.
The results of external temperature measurements are
stored in 8-bit, twos complement format, as illustrated in
Table 6.
Offset Registers
Digital noise and other error sources can cause offset
errors in the temperature measurement, particularly on the
remote sensors. The ADM1029 offers a way to minimize
these effects. The offsets on the three temperature channels
can be measured during system characterization and stored
as twos complement values in three offset registers at
addresses 30h to 32h. The offset values are automatically
added to, or subtracted from, the temperature values,
depending on whether the twos complement number
corresponds to a positive or negative offset. Offset values
from 15癈 to +15癈 are allowed.
The default value in the offset registers is zero, so if no
offsets are programmed, the temperature measurements are
unaltered.
Temperature Limits
The contents of the Local and Remote Temperature Value
Registers (addresses A0h to A2h) are compared to the
contents of the High and Low Limit Registers at addresses
90h to 92h and 98h to 9Ah. How the ADM1029 responds to
overtemperature/undertemperature conditions depends on
the status of the Temperature Fault Action Registers
(addresses 40h to 42h). The response of CFAULT
, INT
, and
fan-speed-to-temperature events depends on the setting of
these registers, as explained later.
Table 6. TEMPERATURE DATA FORMAT
Temperature
Digital Output
128癈
1000 0000
125癈
1000 0011
100癈
1001 1100
75癈
1011 0101
50癈
1100 1110
25癈
1110 0111
0癈
0000 0000
+10癈
0000 1010
+25癈
0001 1001
+50癈
0011 0010
+75癈
0100 1011
+100癈
0110 0100
+125癈
0111 1101
+127癈
0111 1111
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:
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