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ADM1021ARQ

Low Cost Microprocessor System Temperature Monitor

Analog Devices 

ADM1021

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.

C1*

2N3904 SHIELD

*C1 IS OPTIONAL

ADM1021 VDD

STBY

D+

SCLK

SDATA

D–

ALERT

ADD0

ADD1

GND

0.1␮F

3.3V

ALL 10k⍀

IN

I/O

OUT

TO PIIX4

CHIP

SET TO REQUIRED

ADDRESS

Figure 18. Typical ADM1021 Application Circuit

HOST BUS

PROCESSOR

BUILT-IN

SENSOR

MAIN MEMORY

(DRAM)

SECOND LEVEL

CACHE

HOST-TO-PCI

BRIDGE

PCI BUS (3.3V OR 5V 30/33MHz)

MAIN MEMORY

(DRAM)

PCI SLOTS

CD ROM

HARD

DISK

BMI IDE

ULTRA DMA/33

HARD

DISK

8237 1AB

(PIIX4)

ISA/EIO BUS

(3.3V, 5V TOLERANT)

USB PORT 1

D– D+

ADM1021

ALERT SCLK SDATA

USB PORT 2

GPI[I,O] (30+)

SMBUS

AUDIO

KEYBOARD

SERIAL PORT

PARALLEL PORT

FLOPPY DISK

CONTROLLER

INFRARED

BIOS

Figure 19. Typical System Using ADM1021

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

16-Lead Shrink Small Outline Package

(RQ-16)

0.197 (5.00)

0.189 (4.80)

16

0.157 (3.99)

0.150 (3.81)

1

9

0.244 (6.20)

0.228 (5.79)

8

PIN 1

0.059 (1.50)

MAX

0.069 (1.75)

0.053 (1.35)

0.010 (0.25)

0.004 (0.10)

0.025

(0.64)

BSC

8؇

0.012 (0.30) SEATING 0.010 (0.20) 0؇

0.008 (0.20) PLANE 0.007 (0.18)

0.050 (1.27)

0.016 (0.41)

–12–

REV. 0

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