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ADM1021 Datasheet(PDF) 12 Page - Analog Devices

Part No. ADM1021
Description  Low Cost Microprocessor System Temperature Monitor
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1021 Datasheet(HTML) 12 Page - Analog Devices

 
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ADM1021
–12–
REV. 0
APPLICATION CIRCUITS
Figure 18 shows a typical application circuit for the ADM1021,
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 ADM1021 can be inter-
faced directly to the SMBus of an I/O controller such as the
Intel PCI ISA IDE Xcelerator (PIIX4) chip type 82371AB.
Figure 19 shows how the ADM1021 might be integrated into a
system using this type of I/O controller.
USB PORT 1
MAIN MEMORY
(DRAM)
BUILT-IN
SENSOR
PROCESSOR
HOST BUS
SECOND LEVEL
CACHE
HOST-TO-PCI
BRIDGE
MAIN MEMORY
(DRAM)
PCI BUS (3.3V OR 5V 30/33MHz)
PCI SLOTS
D– D+
ADM1021
USB PORT 2
ALERT SCLK SDATA
CD ROM
HARD
DISK
BMI IDE
ULTRA DMA/33
8237 1AB
(PIIX4)
HARD
DISK
GPI[I,O] (30+)
AUDIO
SERIAL PORT
PARALLEL PORT
FLOPPY DISK
CONTROLLER
INFRARED
SMBUS
KEYBOARD
BIOS
ISA/EIO BUS
(3.3V, 5V TOLERANT)
Figure 19. Typical System Using ADM1021
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Lead Shrink Small Outline Package
(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
VDD
STBY
SCLK
SDATA
ALERT
ADD0
ADD1
GND
D+
D–
0.1 F
ALL 10k
3.3V
TO PIIX4
CHIP
SET TO REQUIRED
ADDRESS
IN
OUT
I/O
C1*
SHIELD
2N3904
*C1 IS OPTIONAL
ADM1021
Figure 18. Typical ADM1021 Application Circuit


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