ADM1024 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADM1024

System Hardware Monitor with Remote Diode Thermal Sensing

Analog Devices 

CMOS

BACKUP

BATTERY

1N914

MRD901

470k⍀

74HC132

N1

N3

N2

N4

1N914

5V

100k⍀

CI

10k⍀

ADM1024

output is inverted by Q1 to make it compatible with the CI

input. Q1 can be almost any small-signal NPN transistor, or a

TTL or CMOS inverter gate may be used if one is available. See

the AD22105 data sheet for information on selecting RSET.

RSET

AD22105

TEMPERATURE

SENSOR

VCC

R1

10k⍀

CI

Q1

Figure 12. Chassis Intrusion Detector and Latch

The Chassis Intrusion input can also be used for other types of

alarm input. Figure 13 shows a temperature alarm circuit using

an AD22105 temperature switch sensor. This produces a low

going output when the preset temperature is exceeded, so the

Figure 13. Using the CI Input with a Temperature Sensor

Note: The chassis intrusion input does not have a protective

clamp diode to VCC, as this could pull down the chassis intru-

sion latch and reset it when the ADM1024 is powered down.

VID0/IRQ0

VID1/IRQ1

VID2/IRQ2

VID3/IRQ3

VID4/IRQ4

VID0–VID4

REGISTERS

4

5

CHANNEL

MODE

REGISTER

6

7

6

CONFIGURATION

REGISTER 2

7

FROM

VALUE

AND LIMIT

REGISTERS

HIGH

LIMIT

VALUE

LOW

LIMIT

HIGH

AND

LOW

LIMIT

COMPARA-

TORS

1 = OUT

OF

LIMIT

DATA

DEMULTI-

PLEXER

2.5V/EXT.

TEMP 2

VCCP1

VCC

+5VIN

INT. TEMP

EXT. TEMP1

FAN1/AIN1

FAN2/AIN2

+12VIN

VCCP2

RESERVED

RESERVED

CI

THERM

D1 FAULT

D2 FAULT

0

1

2

3

INTERRUPT

STATUS

4 REGISTER 1

5

6

7

0

1

2

3

INTERRUPT

STATUS

4 REGISTER 2

5

6

7

16 MASK BITS

MASKING

DATA

FROM BUS

INTERRUPT MASK

REGISTERS 1 AND 2

(SAME BIT ORDER AS

STATUS REGISTERS)

MASK GATING ؋ 11

STATUS

BIT

MASK

BIT

INT

INT ENABLE

INT CLEAR

CONFIGURATION

REGISTER 1

THERM

THERM

CLEAR

THERM

Figure 14. Interrupt Register Structure

REV. B

–19–

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