LM63

1

2

3

4

5

6

7

8

2.2 nF

+3.3 VDC from motherboard

SMBCLK

SMBDAT

PWM Output

To SMBus

interface

control

circuitry

ALERT / Tach

GND

VDD

D+

D-

PWM

Remote diode-

connected transistor

inside of an Intel®

Pentium® 4 Processor

ALERT to system

shutdown circuitry

+3.3 VDC

470

MMBT2222A

Tach. input

from Fan

Fan voltage

+12 or +5 VDC

10k

13k

1k

0.2W

Tach In

0.1

100 pF

10 PF

These two capacitors

are close to Pin 1

DC brushless

fan module with

Tachometer

Fan V+

Fan V-

10

Processor

LM63

SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

www.ti.com

TYPICAL APPLICATION

Figure 3.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

4

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