TC664 MICROCHIP [Microchip Technology], TC664 Datasheet

TC664

Manufacturer Part Number

TC664

Description

Manufacturer

MICROCHIP [Microchip Technology]

Datasheet

1.TC664.pdf (36 pages)

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Features

• Temperature Proportional Fan Speed for Reduced

• FanSense™ Protects against Fan Failure and

• Over Temperature Detection (TC665)

• Efficient PWM Fan Drive

• Provides RPM Data

• 2-Wire SMBus™-Compatible Interface

• Supports Any Fan Voltage

• Software Controlled Shutdown Mode for "Green"

• Supports Low Cost NTC/PTC Thermistors

• Space Saving 10-Pin MSOP Package

• Temperature Range: -40°C to +85ºC

Applications

• Personal Computers & Servers

• LCD Projectors

• Datacom & Telecom Equipment

• Fan Trays

• File Servers

• Workstations

• General Purpose Fan Speed Control

Package Type

Acoustic Noise and Longer Fan Life

Eliminates the Need for 3-wire Fans

Systems

2002 Microchip Technology Inc.

SMBus is a trademark of Intel Coporation

10-Pin MSOP

SCLK

GND

SDA

SMBus™ PWM Fan Speed Controllers With

TC664

TC665

Fan Fault Detection

SENSE

FAULT

OUT

TC664/TC665

Description

The TC664/TC665 devices are PWM mode fan speed

controllers with FanSense technology for use with

brushless DC fans. These devices implement temper-

ature proportional fan speed control which lowers

acoustic fan noise and increases fan life. The voltage

at V

provided by an external thermistor or voltage output

temperature sensor. The PWM output (V

adjusted between 30% and 100%, based on the volt-

age at V

grammed via SMBus to allow fan speed control without

the need for an external thermistor. If V

nected, the TC664/TC665 will start driving the fan at a

default duty cycle of 39.33%. See Section 4.3, "Fan

Startup", for more details).

In normal fan operation, a pulse train is present at the

SENSE pin (Pin 8). The TC664/TC665 use these

pulses to calculate the fan revolutions per minute

(RPM). The fan RPM data is used to detect a worn out,

stalled, open or unconnected fan. An RPM level below

the user-programmable threshold causes the TC664/

TC665 to assert a logic low alert signal (FAULT). The

default threshold value is 500 RPM. Also, if this condi-

tion occurs, FF (bit 0<0>) in the Status Register will also

be set to a ‘1’.

An over-temperature condition is indicated when the

voltage at V

TC665 devices indicate this by setting OTF(bit 5<X>) in

the Status Register to a '1'. The TC665 device also

pulls the FAULT line low during an over-temperature

condition.

The TC664/TC665 devices are available in a 10-Pin

MSOP package and consume 150 µA during opera-

tion. The devices can also enter a low-power shutdown

mode (5 µA, typ.) by setting the appropriate bit in the

Configuration Register. The operating temperature

range for these devices is -40°C to +85ºC.

(Pin 1) represents temperature and is typically

. The PWM duty cycle can also be pro-

exceeds 2.6 V (typical). The TC664/

DS21737A-page 1

is not con-

OUT

) is

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