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參數(shù)資料
| 型號： | ADM1023ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大小： | 170K |
| 代理商： | ADM1023ARQ |
–12–
C
P
ADM1023
REV. A
around the package. The thermal time constant of the QSOP-16
package is about 10 seconds.
In practice, the package will have electrical, and hence thermal,
connection to the printed circuit board, so the temperature rise
due to self-heating will be negligible.
LAYOUT CONSIDERATIONS
Digital boards can be electrically noisy environments, and the
ADM1023 is measuring very small voltages from the remote
sensor, so care must be taken to minimize noise induced at the
sensor inputs. The following precautions should be taken:
1. Place the ADM1023 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 four to eight 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. 10 mil track minimum width and spacing is
recommended.
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
10MIL
GND
D+
D
–
GND
Figure 18. Arrangement of Signal Tracks
4. Try to minimize the number of copper/solder joints, which
can cause thermocouple effects. Where copper/solder joints
are used, make sure that they are in both the D+ and D
–
path and at the same temperature.
Thermocouple effects should not be a major problem as 1
°
C
corresponds to about 240
μ
V, and thermocouple voltages are
about 3
μ
V/
°
C of temperature difference. Unless there are
two thermocouples with a big temperature differential between
them, thermocouple voltages should be much less than 240
μ
V.
5. Place a 0.1
μ
F bypass capacitor close to the V
DD
pin and
2200 pF input
fi
lter capacitors across D+, D
–
close to the
ADM1023.
6. If the distance to the remote sensor is more than eight 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 ADM1023. Leave the remote end of the shield uncon-
nected to avoid ground loops.
Because the measurement technique uses switched current sources,
excessive cable and/or
fi
lter capacitance can affect the measure-
ment. When using long cables, the
fi
lter capacitor may be reduced
or removed.
Cable resistance can also introduce errors. 1
series resistance
introduces about 1
°
C error.
APPLICATION CIRCUITS
Figure 19 shows a typical application circuit for the ADM1023,
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 ADM1023 can be interfaced
directly to the SMBus of an I/O chip. Figure 20 shows how the
ADM1023 might be integrated into a system using this type of
I/O controller.
ALERT
GND
ADD0
D+
D
–
ADM1023
OUT
SCLK
SDATA
ADD1
V
DD
I/O
SET TO
REQUIRED
ADDRESS
IN
3V
TO 5.5V
2200pF
10k
10k
TO
CONTROL
CHIP
10k
0.1 F
SHIELD
2N3904
Figure 19. Typical ADM1023 Application Circuit
USB
2 USB PORTS
ICH I/O
CONTROLLER
HUB
CD ROM
HARD
DISK
SYSTEM
MEMORY
PROCESSOR
GMCH
DISPLAY
DISPLAY
CACHE
ADM1023
S
S
A
D+
D
–
SYSTEM BUS
PCI BUS
PCI SLOTS
USB
FWH
(FIRMWARE
HUB)
SUPER I/O
SMBUS
2 IDE PORTS
Figure 20. Typical System Using ADM1023
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Lead QSOP
(RQ-16)
16
9
8
1
0.197 (5.00)
0.189 (4.80)
0.244 (6.20)
0.228 (5.79)
PIN 1
0.157 (3.99)
0.150 (3.81)
SEATING
PLANE
0.010 (0.25)
0.004 (0.10)
0.012 (0.30)
0.008 (0.20)
0.025
(0.64)
BSC
0.059 (1.50)
MAX
0.069 (1.75)
0.053 (1.35)
0.010 (0.20)
0.007 (0.18)
0.050 (1.27)
0.016 (0.41)
8
0
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