參數(shù)資料
型號(hào)： AMD1027
廠商： Analog Devices, Inc.
英文描述： dBCOOL Remote Thermal Controller and Voltage Monitor
中文描述： dBCOOL遠(yuǎn)程熱控制器和電壓監(jiān)視器
文件頁數(shù)： 15/56頁
文件大?。?/td> 1072K
代理商： AMD1027
REV. A
ADM1027
–15–
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 14 shows
how to connect the ADM1027 to an NPN or PNP transistor for
temperature measurement. To prevent ground noise from inter-
fering 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
D
V
be
, the sensor is switched between operating cur-
rents 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 recti-
fication of the waveform to produce a dc voltage proportional to
D
V
be
. This voltage is measured by the ADC to give a temperature
output in 10-bit, 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 measure-
ment takes nominally 25.5 ms. The results of remote temperature
measurements are stored in 10-bit, twos complement format,
as illustrated in Table III. 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
o
C.
Table III. Temperature Data Format
*
Temperature
–128
∞
C
–125
∞
C
–100
∞
C
–75
∞
C
–50
∞
C
–25
∞
C
–10
o
C
0
∞
C
+10.25
∞
C
+25.5
∞
C
+50.75
∞
C
+75
∞
C
+100
∞
C
+125
∞
C
+127
∞
C
Digital Output (10-Bit)
1000 0000
00
1000 0011
00
1001 1100
00
1011 0101
00
1100 1110
00
1110 0111
00
1111 0110
00
0000 0000
00
0000 1010
01
0001 1001
10
0011 0010
11
0100 1011
00
0110 0100
00
0111 1101
00
0111 1111
00
*
Bold denotes 2 LSBs of measurement in Extended Resolution
Register 2 (Reg. 0x77) with 0.25
C resolution.
ADM1027
2N3904
NPN
D+
D–
Figure 14a. Measuring Temperature Using an
NPN Transistor
2N3906
PNP
ADM1027
D+
D–
Figure 14b. Measuring Temperature Using a
PNP Transistor
NULLING OUT TEMPERATURE ERRORS
As CPUs run faster, it is getting more difficult to avoid high
frequency clocks when routing the D–/D+ traces around a system
board. Even when recommended layout guidelines are followed,
there may still be temperature errors attributed to noise being
coupled onto the D+/D– lines. High frequency noise generally
has the effect of giving temperature measurements that are too
high by a constant amount. The ADM1027 has temperature
offset registers at addresses 0x70, 0x71, and 0x72 for the Remote 1,
Local, and Remote 2 temperature channels. By doing a one-time
calibration of the system, you can determine the offset caused
by system board noise and null it out using the offset registers.
The offset registers automatically add a twos complement 8-bit
reading to every temperature measurement. The LSB adds a 1
∞
C
offset to the temperature reading so the 8-bit register effectively
allows temperature offsets of up to 127
∞
C with a resolution of
1
∞
C. This ensures that the readings in the temperature measure-
ment registers are as accurate as possible.
TEMPERATURE OFFSET REGISTERS
Reg. 0x70
Remote 1 Temperature Offset
= 0x00 (0
∞
C default)
Reg. 0x71
Local Temperature Offset
= 0x00 (0
∞
C default)
Reg. 0x72
Remote 2 Temperature Offset
= 0x00 (0
∞
C default)
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