ADM9240 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

ADM9240

Low Cost Microprocessor System Hardware Monitor

ON Semiconductor 

APPLICATION CIRCUIT

Figure 14 shows a generic application circuit using the

AD9240. The analog monitoring inputs are connected to the

power supplies including two processor core voltage inputs. The

VID inputs are connected to the processor voltage ID pins.

There are two tacho inputs from fans, and the analog output is

used to control the speed of a third fan. A chassis intrusion

latch with an opto-sensor is connected to the CI input. Of

course, in an actual application, every input and output may not

be used, in which case unused analog and digital inputs should

be tied to analog or digital ground as appropriate.

+12V

+3.3V

NTEST_OUT/A0

CMOS

BACKUP

BATTERY

1N914

MRD901

470k⍀

+3.3V

74HC132

1N914

+3.3V

100k⍀

A1

SDA

SERIAL BUS

SCL

FAN1

FAN2

CI

+12V

2N2219A

OP295

82k⍀

10k⍀

10k⍀

+3.3V

GNDD

10␮F 0.1␮F

+

VCC

INT

NTEST_IN/AOUT

RESET

ADM9240

ADM9240

VID0

VID1

VID2 FROM VID PINS

OF PROCESSOR

VID3

VID4

510⍀

+VCCP1

510⍀

510⍀

+2.5VIN

+3.3VIN

510⍀

+5VIN

510⍀

+12VIN

510⍀

GNDA

+VCCP2

Figure 14. Application Circuit

REV. 0

Rev. 2 | Page 17 of 22 | www.onsemi.com

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