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ADM1032AR Datasheet(PDF) 12 Page - Analog Devices

Part No. ADM1032AR
Description  -1C Remote and Local System Temperature Monitor
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1032AR Datasheet(HTML) 12 Page - Analog Devices

 
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REV. 0
–12–
ADM1032
Thermocouple effects should not be a major problem as 1
°C
corresponds to about 200
V, and thermocouple voltages are
about 3 V/
°C of temperature difference. Unless there are two
thermocouples with a big temperature differential between them,
thermocouple voltages should be much less than 200 V.
5. Place a 0.1
µF bypass capacitor close to the VDD pin. In very
noisy environments place a 2200 pF input filter capacitors
across D+, D– close to the ADM1032.
6. If the distance to the remote sensor is more than 8 inches, the
use of twisted pair cable is recommended. This will work up
to about 6 to 12 feet.
7. For really long distances (up to 100 feet) use shielded twisted
pair such as Belden #8451 microphone cable. Connect the
twisted pair to D+ and D– and the shield to GND close to
the ADM1032. Leave the remote end of the shield unconnected
to avoid ground loops.
Because the measurement technique uses switched current
sources, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor may
be reduced or removed.
Cable resistance can also introduce errors. 1
Ω series resistance
introduces about 1
°C error.
APPLICATION CIRCUIT
Figure 7 shows a typical application circuit for the ADM1032,
using a discrete sensor transistor connected via a shielded,
twisted pair cable. The pull-ups on SCLK, SDATA, and
ALERT
are required only if they are not already provided elsewhere
in the system.
The SCLK, and SDATA pins of the ADM1032 can be inter-
faced directly to the SMBus of an I/O controller such as the
Intel 820 chipset.
ALERT
GND
THERM
D+
D–
ADM1032
SCLK
SDATA
VDD
3V TO 3.6V
TYP 10k
0.1 F
SHIELD
2N3906
OR
CPU THERMAL
DIODE
VDD
SMBUS
CONTROLLER
TYP 10k
FAN CONTROL
CIRCUIT
5V OR 12V
FAN ENABLE
Figure 7. Typical Application Circuit
8-Lead SO
(R-8)
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
0
0.0196 (0.50)
0.0099 (0.25)
45
85
4
1
0.1968 (5.00)
0.1890 (4.80)
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0500 (1.27)
BSC
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
8-Lead Micro_SO
(RM-8)
0.009 (0.23)
0.003 (0.08)
0.028 (0.71)
0.016 (0.41)
6
0
0.120 (3.05)
0.112 (2.84)
85
4
1
0.122 (3.10)
0.114 (2.90)
0.199 (5.05)
0.187 (4.75)
PIN 1
0.0256 (0.65) BSC
0.122 (3.10)
0.114 (2.90)
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.015 (0.38)
0.009 (0.22)
0.043 (1.09)
0.037 (0.94)
0.120 (3.05)
0.112 (2.84)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).


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