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ADM1023
? 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 4 to 8 inches.
can affect the measurement. When using long cables, the
filter capacitor may be reduced or removed.
Cable resistance can also introduce errors. A 1 W series
resistance introduces about 1 ? C error.
?
?
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 (see Figure 19).
Use wide tracks to minimize inductance and reduce
noise pickup. 10 mil track minimum width and spacing
is recommended.
Application Circuits
Figure 20 shows a typical application circuit for the
ADM1023, using a discrete sensor transistor connected via
a shielded, twisted-pair cable. The pullups on SCLK,
SDATA, and ALERT are required only if they are not
already provided elsewhere in the system.
GND
10MIL
10MIL
V DD
ADM1023
0.1 ? F
3V
TO 5.5V
D+
D–
10MIL
10MIL
10MIL
2N3904
1000pF
SHIELD
D+
D–
ALERT
10k ? 10k ? 10k ?
IN
I/O
OUT
TO
CONTROL
CHIP
GND
10MIL
10MIL
GND
ADD0
ADD1
SET TO
REQUIRED
ADDRESS
Figure 19. Arrangement of Signal Tracks
? 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 m V, and thermocouple
voltages are about 3 m 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 m V.
Figure 20. Typical Application Circuit
The SCLK and SDATA pins of the ADM1023 can be
interfaced directly to the SMBus of an I/O chip. Figure 21
shows how the ADM1023 might be integrated into a system
using this type of I/O controller.
D–
ADM1023
PROCESSOR D+
?
Place a 0.1 m F bypass capacitor close to the V DD pin
and 1000 pF input filter capacitors across D+, D ? close
to the ADM1023.
SYSTEM BUS
?
?
If the distance to the remote sensor is more than 8
inches, the use of twisted pair cable is recommended.
This is effective up to approximately 6 to 12 feet.
For longer distances (up to 100 feet), use shielded,
twisted-pair cable such as Belden #8451 microphone
cable. Connect the twisted pair to D+ and D ? , and
connect the shield to GND close to the ADM1023.
Leave the remote end of the shield unconnected to
avoid ground loops.
Because the measurement technique uses switched
DISPLAY
DISPLAY
CACHE
HARD
CD ROM DISK
2 IDE PORTS
USB USB
2 USB PORTS
GMCH
ICH I/O
CONTROLLER
HUB
FWH
(FIRMWARE
HUB)
SYSTEM
MEMORY
PCI SLOTS
PCI BUS
SUPER I/O
SMBUS
current sources, excessive cable and/or filter capacitance
Table 13. ORDERING INFORMATION
Figure 21. System Using ADM1023 and I/O Controller
Device Number
ADM1023ARQZ ? REEL
Temperature Range
0 ? C to +120 ? C
Package Type
16 ? Lead QSOP
Package Option
RQ ? 16
Shipping ?
2,500 Tape & Reel
?For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*The “Z’’ suffix indicates Pb-Free part.
http://onsemi.com
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