Microchip TC642 Manual

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Fan Speed Controller and Fan Fault Detector Family

The and are TC642, TC646, TC647, TC648 TC649

fan speed controller products that support external

temperature input.

The and TC642B, TC646B, TC647B, TC648B TC649B

are fan speed controller products that support external

temperature input and incorporate a fan auto-restart

function.

The and are fan speed TC654, TC655, TC664 TC665

controller products that support external temperature

input and two-wire serial communication.

The , and devices are TC64X, TC64XB, TC65X TC66X

pulse width modulation (PWM) fan speed controllers

for DC brushless fans. These devices adjust the speed

of the fan according to the temperature level, thereby

reducing acoustic noise, minimizing power consumption,

and extending fan life. A thermistor or other temperature

dependent voltage output device can be used to supply

the VIN voltage, which sets the required duty cycle

drive signal on VOUT. The TC654/TC655 and TC664/

TC665 products allow the user to control fan speed

and communicate data via a Standard Management

Bus (SMBus) interface. These devices also enable the

user to read fan RPM data and implement predictive fan

failure detection. The entire family features a pulse width

modulation (PWM) frequency of 30 Hz (CF = 1 µF) and an

operating current of less than 0.5 mA.

This family is fully specified from 3.0V to 5.5V over a

-40°C to +85°C temperature range. Numerous features

address a broad spectrum of applications, such as,

shutdown mode for further power savings, FanSense™

technology for fan fault detection, auto-shutdown for

automatic fan shut-off, minimum fan speed for constant

cooling and over temperature alert for overheating

detection. The TC64X and TC64XB devices are available

in 8-pin

PDIP

, MSOP and SOIC packages. The TC65X and

TC66X are available in a 10-pin MSOP package.

These products are ideal for every application utilizing

DC fans, especially where acoustic noise and fan

reliability are critical. Suitable applications include

computers, projectors, servers, datacom equipment,

telecom equipment, power supplies, set-top boxes, fan

racks and test equipment.

Features:

• Temperature proportional fan speed control

• FanSense™ technology protects against fan and

system failure

• 3.0V to 5.5V supply voltage range

• Low operating current

• 30 Hz pulse width modulation (PWM) frequency

(CF = 1 µF)

• Support low cost NTC/PTC thermistors

• Shutdown mode

• Fan auto-restart (TC64XB devices only)

• Read RPM data (TC654/TC655, TC664/TC665)

• SMBus interface (TC654/TC655, TC664/TC665)

• Temperature range: -40°C to +85°C

• Available in PDI

, MSOP and SOIC packages

Application Notes:

• AN764 Implementing Temperature-based Variable

Fan Speed Control in NLX Power Supplies

• AN768 Redundant Fan Systems using the TC642

Fan Manager

• AN770 Linear Voltage Fan Speed Control using

Microchip’s TC64X family

• AN771 Suppressing Acoustic Noise in Pulse Width

Modulation Fan Speed Control Systems

• AN772 Speed Error in Pulse Width Modulation Fan

Control Systems

Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199 • (480) 792-7200 • Fax (480) 792-9210

Additional Information:

• Microchip’s web site: www.microchip.com

• Analog & Interface Families Data Book 2002, Order No. DS00207

• Stand-Alone Analog and Interface Solutions Flyer, DS21060

• Product Line Card, Order No. DS00148

• TC642 Data Sheet, DS21444

• TC646 Data Sheet, DS21446

• TC647 Data Sheet, DS21447

• TC648 Data Sheet, DS21448

• TC649 Data Sheet, DS21449

• TC642B Data Sheet, DS21756

• TC646B Data Sheet, DS21755

• TC647B Data Sheet, DS21756

• TC648B Data Sheet, DS21755

• TC649B Data Sheet, DS21755

• TC654/TC655 Data Sheet, DS21374

• TC664/TC665 Data Sheet, DS21737

Development Tools Support:

TC642 Fan Control Demo Board User’s Guide (DS21401): This Fan Control circuit board allows the user to quickly

evaluate and prototype Microchip’s TC64X and TC64XB pulse width modulation (PWM) Fan Control ICs.

TC642 Fan Control Evaluation Board User’s Guide (DS21403): This fully assembled 4 inch by 6 inch circuit board allows

the user to evaluate and prototype fan control circuits based on Microchip’s TC64X and TC64XB DC brushless fan

controllers.

Fan Speed Controller and Fan Fault Detector Specifications

Product

1VCC

Range

Temperature

Range

Over-Temp

Alert

Typical

SMBus

Interface

Min Fan

Speed

Temp

Auto-

Shutdown

of Fans

Monitored

RPM

Data

Predictive

Fan Fault

Detection

Fan

Auto-

Restart

# of Pins/

Package

TC642

+3.0V to +5.5V -40°C to +85°C

X 500 µA — X — 1 — — —

8SN, 8MS

TC646

+3.0V to +5.5V -40°C to +85°C

X 500 µA — — X 1 — — —

8SN, 8MS

TC647

+3.0V to +5.5V -40°C to +85°C

— 500 µA — X — 1 — — —

8SN, 8MS

TC648

+3.0V to +5.5V -40°C to +85°C

X 500 µA — — X 0 — — —

8SN, 8MS

TC649

+3.0V to +5.5V -40°C to +85°C

— 500 µA — — X 1 — — —

8SN, 8MS

TC642B

+3.0V to +5.5V -40°C to +85°C

X 200 µA — X — 1 — — X

8SN, 8MS

TC646B

+3.0V to +5.5V -40°C to +85°C

X 200 µA — — X 1 — — X

8SN, 8MS

TC647B

+3.0V to +5.5V -40°C to +85°C

— 200 µA — X — 1 — — X

8SN, 8MS

TC648B

+3.0V to +5.5V -40°C to +85°C

X 200 µA — — X 0 — — X

8SN, 8MS

TC649B

+3.0V to +5.5V -40°C to +85°C

— 200 µA — — X 1 — — X

8SN, 8MS

TC654

+3.0V to +5.5V -40°C to +85°C

— 150 A X X — 2 X X — 10UNµ

TC655

+3.0V to +5.5V -40°C to +85°C

X 150 A X X — 2 X X — 10UNµ

TC664

+3.0V to +5.5V -40°C to +85°C

— 150 A X X — 1 X X — 10UNµ

TC665

+3.0V to +5.5V -40°C to +85°C

X 150 A X X — 1 X X — 10UNµ

Note 1. These devices use an external sensor. Accuracy of the total solution is a function of the accuracy of the external sensor.

Package Key: P SN MS UN = PDIP = SOIC = MSOP = MSOP

Visit our web site at www.microchip.com for additional product information and your local sales office.

Information subject to change. The Microchip name and logo are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. FanSense is a trademark of Microchip