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EMC6D102

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

SMSC -> Microchip 

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

Datasheet

3.3V

Tach

Output

from Fan

D1

IN4148

10k

TACH

Input

Note: For fans controlled directly by a PWM, it is suggested to implement

the optional diode (D1) to protect the tachometer input from large voltage

spikes generated by the fan.

Figure B.3 Fan Tachometer Circuitry (Apply to Each Fan)

Remote Diode +

2.2nF

External Temperature

Sensing Diode

(MMBT3904)

Remote Diode -

Figure B.4 Remote Diode (Apply to Remote2 Lines)

Notes:

1. 2.2nF cap is optional and should be placed close to the EMC6D102 if used.

2. The voltage at PWM3 must be at least 2.0V to avoid triggering Address Enable.

3. The Remote Diode + and Remote Diode - tracks should be kept close together, in parallel with

grounded guard tracks on each side. Using wide tracks will help to minimize inductance and

reduce noise pickup. A 10 mil track minimum width and spacing is recommended. See Figure B.5,

"Suggested Minimum Track Width and Spacing".

.

GND

D+

D-

GND

10 mil.

10 mil.

10 mil.

10 mil.

10 mil.

10 mil.

10 mil.

Figure B.5 Suggested Minimum Track Width and Spacing

Revision 0.4 (04-05-05)

86

DATASHEET

SMSC EMC6D102

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