TC642 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC642

PWM Fan Speed Controller with FanSense™ Technology

Microchip Technology 

TC642

Power-Up

Normal

Operaton

Power-on

Reset

FAULT = 1

Yes

VMIN < VSHDN

No

Fire Start-up

Timer

(1 SEC)

Shutdown

VOUT = 0

No

VMIN > VREL?

Yes

Clear

Missing Pulse

Detector

VMIN < VSHDN?

No

Yes

Shutdown

VOUT = 0

No

VMIN > VREL

Yes

Power-up

Fan Fault

Detected?

Yes

Fire Start-up

TimYeErS

(1 SEC)

No

Normal

Operation

Yes Fan Pulse

Detected?

No

Fan Fault

Fan Fault

FAULT = 0,

VOUT = 0

VMIN < VSHDN?

No

Yes

VMIN > VREL? No

Yes

No

Cycling

Power?

Yes

VIN > VOTF?

No

Yes

FAULT = 0

VOUT

Proportional to Greater

of VIN or VMIN

Yes

No

Fan Pulse

Detected?

M.P.D.

Expired?

No

Yes

Fire Diagnostic

Timer

(100msec)

Yes

No

Fan Pulse

Detected?

Fire Start-up

Timer

(1 SEC)

Yes Fan Pulse

Detected?

No

Fan Fault

FIGURE 4-1:

Power-up

TC642 Behavioral Algorithm Flowchart.

DS21444C-page 8

 2002 Microchip Technology Inc.

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