TC670_13_技术文档

TC670

Tiny Predictive Fan Failure Detector

Features

General Description

• Fan Wear-Out Detection for 2-Wire

Linear-Controlled Fans

The TC670 is an integrated fan speed sensor that

predicts and/or detects fan failure, preventing thermal

damage to systems with cooling fans. When the fan

speed falls below a user-specified level, the TC670

asserts an ALERT signal. With this design, a critical

minimum fan speed is determined by the user. The fan

alert level is then set with a resistor divider on the

THRESHOLD pin (Pin 1) of the TC670. When the

minimum fan speed is reached, the ALERT pin (Pin 5)

changes from a digital high to low. This failure detection

works with all linear-controlled 2-wire fans. The TC670

eliminates the need for 3-wire fan solutions.

• Replacement System for 3-Wire Fans

• Fan Alert Signal when Fan Speed is below

Programmed Threshold

• CLEAR Capability for Eliminating False Alarm

• Low Operating Current, 90 µA (typ.)

• V_DDRange 3.0V to 5.5V

• Available in a 6-Pin SOT-23 Package

Applications

A CLEAR option can be used to reset the ALERT sig-

nal, allowing the flexibility of connecting the ALERT

output of the TC670 with other ALERT/FAULT inter-

rupts in the system. This feature can be implemented

so that false fan fault conditions do not initiate system

shutdown.

• Protection for Linear-Controlled Fans

• Power Supplies

• Industrial Equipment

• PCs and Notebooks

• Data Storage

• Data Communications Equipment

• Instrumentation

The TC670 is specified to operate over the full

industrial temperature range of -40°C to +85°C. The

TC670 is offered in a 6-pin SOT-23 pin package and

consumes 90 µA (typ.) during operation. The space-

saving package and low power consumption make this

device an ideal choice for systems requiring fan speed

monitoring.

Package Type

SOT-23A-6

THRESHOLD

GND

1

2

3

6

5

4

SENSE

ALERT

V_DD

Typical Application Circuit

+5V

CLEAR

ALERT

LED

4

V

DD

R

0.1 µF

3

4

+12V

CLEAR

5

6

ALERT

From

Microcontroller

R

3

DC

FAN

1

C

THRESHOLD

SENSE

R

2

R

SENSE

GND

2

 2001-2012 Microchip Technology Inc.

DS21688D-page 1

TC670

TABLE 1-1:

Symbol

PIN FUNCTION TABLE

Description

1.0

ELECTRICAL

CHARACTERISTICS

THRESHOLD Analog Input

Absolute Maximum Ratings†

GND

CLEAR

VDD

Ground Terminal

Digital Input

V

...................................................................................6.0V

DD

All Inputs and Outputs. ............(GND 0.3V) to (V + 0.3V)

DD

Bias Supply Input

Digital (Open-Drain) Output

Analog Input

Output Short-Circuit Current .................................continuous

Current at Input Pin ................................................... +/-2 mA

Current at Output Pin .............................................. +/-25 mA

ALERT

SENSE

Junction Temperature, T .............................................150°C

J

ESD protection on all pins4 kV

Operating Temperature Range........................-40°C to +85°C

Storage Temperature Range.........................-55°C to +150°C

† Notice: Stresses above those listed under "Maximum

Ratings" may cause permanent damage to the device. This is

a stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operation listings of this specification is not implied. Exposure

to maximum rating conditions for extended periods may affect

device reliability.

DC CHARACTERISTICS

Electrical Specifications: Unless otherwise specified, all limits are specified at +25°C, V_DD= 3.0V to 5.5V,

CLEAR = Low. Boldface type specifications apply for temperature range of -40°C to +85°C.

Parameters

Power Supply

Sym

Min

Typ

Max

Units

Conditions

Supply Voltage

V

3.0

—

5.5

V

DD

Supply Current

I

—

90

150

µA

DD

CLEAR Input

Logic Input High Level

Logic Input Low Level

SENSE Input

V

0.8V

—

V

IH

DD

V

—

0.2V

DD

IL

Input Level Threshold Voltage

Input Resistance

V

—

124

50

—

mV

TH(SENSE)

R

k

SENSE

THRESHOLD Input

Input Voltage Minimum

Input Voltage Maximum

Input Resistance

—

0.0

2.4

100

—

V

—

M

%

Programmed Fan Speed Alert Accuracy ALERT

-10

+10

V

= 3.0V

DD

ACC

(Note 1)

ALERT Output

Output Low Voltage

V

—

0.3

V

I

= 2.5 mA

LOW

SINK

Output Delay Time

t

176

—

ms

DELAY

Temperature Ranges

Specified Temperature Range

Operating Temperature Range

Thermal Package Resistances

Thermal Resistance, 6L-SOT-23

T

-40

—

+85

°C

A

T

+125

A



—

230

—

°C/W

JA

Note 1: The TC670 will operate properly over the entire power supply range of 3.0V to 5.5V. As V_DDvaries from

3.0V, accuracy will degrade based on the percentage of V_DD, as shown in Section 2.0, “Typical

Performance Curves”.

DS21688D-page 2

 2001-2012 Microchip Technology Inc.

TC670

2.0

TYPICAL PERFORMANCE CURVES

Note: The graphs and tables provided following this note are a statistical summary based on a limited number of

samples and are provided for informational purposes only. The performance characteristics listed herein

are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified

operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

Note: Unless otherwise indicated, all limits are specified at +25°C, V_DD= 3.0V to 5.5V, CLEAR = Low.

115

160

110

105

+90°C

140

120

100

80

V

= 3.0V

DD

100

95

90

85

80

75

70

+25°C

-45°C

60

40

V

= 5.5V

4

DD

20

0

0.5

1

1.5

2

2.5

3

3.5

4.5

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.1

5.4

5.7

6.0

2.7

ALERT I

SINK

(mA)

Supply Voltage (V)

FIGURE 2-1:

Voltage.

Supply Current vs. Supply

FIGURE 2-4:

I_SINK

ALERT V_LOWvs. ALERT

.

15000

14000

13000

12000

11000

10000

9000

8000

7000

6000

5000

4000

3000

2000

1000

0

13000

12000

11000

10000

9000

8000

7000

6000

5000

4000

3000

T

= -40˚C

A

V

= 3.0V

DD

T

= +25˚C

= +90˚C

A

V

= 2.7V

DD

T

A

V

DD

= 3.3V

V

= 3.0V

DD

-10.0 -8.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 6.0 8.0 10.0

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

ALERT (%)

ACC

THRESHOLD Voltage (V)

FIGURE 2-2:

Voltage.

Fan Speed vs. Threshold

FIGURE 2-5:

Fan Speed vs. ALERT_ACC.

15000

14000

13000

12000

11000

10000

9000

8000

7000

6000

5000

4000

3000

2000

1000

0

V

= 3.6V

DD

177

176

175

174

173

172

171

170

169

V

= 5.5V

DD

V

= 5.0V

DD

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

168

2.5

THRESHOLD Voltage (V)

3.0

3.5

4.0

4.5

5.0

Power Supply Voltage (V

)

DD

FIGURE 2-3:

Fan Speed vs. Threshold

Voltage.

FIGURE 2-6:

ALERT Output Delay vs.

Power Supply Voltage.

 2001-2012 Microchip Technology Inc.

DS21688D-page 3

TC670

Note: Unless otherwise indicated, all limits are specified at +25°C, V_DD= 3.0V to 5.5V, CLEAR = Low.

FIGURE 2-7:

CLEAR pin high to ALERT

pin high Timing Diagram.

DS21688D-page 4

 2001-2012 Microchip Technology Inc.

TC670

3.3

Digital Input (CLEAR)

3.0

PIN DESCRIPTIONS

The CLEAR input is used to reset or blank the ALERT

output. When the CLEAR input is driven high, the

ALERT output will be high-impedance (the ALERT

output requires a pull-up resistor).

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

Description

THRESHOLD Analog Input

No.

Symbol

3.4

Bias Supply Input (V

)

DD

1

2

3

4

5

6

Bias Supply Input, 3.0V to 5.5V. The bias supply input

should be bypassed to ground with a 0.1 µF ceramic

capacitor.

GND

CLEAR

VDD

Ground Terminal

Digital Input

Bias Supply Input

Digital (Open-Drain) Output

Analog Input

3.5

Digital (Open-Drain) Output

(ALERT)

ALERT

SENSE

The ALERT output is an open-drain output that

requires an external pull-up resistor. The ALERT output

is pulled low when the sensed fan speed (detected by

the pulses occurring at the SENSE input) falls below

the speed that is represented by the voltage at the

THRESHOLD pin. The ALERT output is latched in this

state until power is cycled or the CLEAR input is

toggled.

3.1

Analog Input (THRESHOLD)

The voltage set at the THRESHOLD input represents

the fan speed at which the TC670 will signal a fan

speed warning by pulling the ALERT output low. The

threshold voltage to fan speed correlation can be seen

in Figures 2-2 and 2-3.

3.2

Ground (GND)

3.6

Analog Input (SENSE)

The GND pin (Pin 2) of the TC670 should be connected

directly to the analog ground plane of the circuit board.

Care should be taken to keep this pin away from

switching signals, such as the fan excitation signals in

order to avoid false signals on the SENSE pin.

Voltage pulses, which are generated by the fan current

flowing through a sense resistor, are detected at the

SENSE pin and used to calculate the fan speed.

 2001-2012 Microchip Technology Inc.

DS21688D-page 5

TC670

4.0

DETAILED DESCRIPTION

+5V

The TC670 is an integrated fan speed sensor that

predicts/detects fan failure, consequently preventing

thermal damage to systems with cooling fans. When

the fan speed falls below a user-programmed threshold

level, the TC670 asserts an ALERT signal. This

threshold is set with an external resistor divider

network.

ALERT

LED

4

V

DD

R

0.1 µF

3

4

+12V

CLEAR

5

6

ALERT

V

R

DD

3

CLEAR

ALERT

DC

FAN

1

C

THRESHOLD

SENSE

Logic

THRESHOLD

R

2

R

SENSE

GND

2

50 k

Frequency-to-

Voltage

SENSE

GND

Note: This typical application circuit uses a LED to

indicate that a fan failure has occurred.

124 mV

Bandgap

Oscillator

FIGURE 4-2:

Typical Application Circuit.

FIGURE 4-1:

TC670 Block Diagram.

4.1 SENSE Input

As shown in Figure 4-1, the TC670 senses the fan

pulses and internally converts those pulses from a

frequency into an analog voltage. This voltage is then

compared with the DC voltage at the THRESHOLD pin.

If the converted frequency-to-voltage value from the

fan's pulses falls below the threshold voltage, the

ALERT output is pulled low.

As shown in Figure 4-2, the SENSE input (Pin 6) is

connected to the sense resistor (R_SENSE) through a

capacitor (C_SENSE). The low value current sensing

resistor (R_SENSE) is connected between the ground

return leg of the fan and the fan bias ground. During

normal fan operation, commutation occurs as each

pole of the fan is energized. This causes the fan current

to be an AC waveform with fast falling edges.

In a 3.0V system, the external fan alert level on the

THRESHOLD pin can be designed from 0.0V (stalled

fan) to 2.4V (for 13,000 RPM) to cover most of the com-

mon fan speeds. This failure detection system works

with linear-controlled 2-wire fans and eliminates the

need for 3-wire fans. The TC670 can also work with

3-wire fans either by using the SENSE circuit or by

directly sensing the RPM output from the 3rd wire.

These short, rapid changes in fan current cause a

corresponding dV/dt voltage across the sense resistor,

as well as a corresponding dI/dt current through the

sense capacitor. The current through C_SENSEis termi-

nated with the internal 50 k input resistance at the

SENSE pin of the TC670. When positive-going fan

pulses at the SENSE input are greater than 124 mV

(typ.), the TC670 latches-in those voltage spikes. This

124 mV (typ.) SENSE input built-in threshold reduces

false triggering errors caused by extraneous noise

pulses associated with a running fan. The presence

and frequency of these pulses is a direct indication of

fan operation and fan speed.

A CLEAR pin is provided to allow the user to reset the

ALERT pin status back to a high state. This clear option

also allows the flexibility of connecting the ALERT out-

put of the TC670 with other alert/fault interrupts in the

system without having a risk of a system shutdown due

to false fan fault condition.

DS21688D-page 6

 2001-2012 Microchip Technology Inc.

TC670

The design of the proper input SENSE circuitry is a

matter of scaling R_SENSEto provide the necessary

amount of gain and proper selection of the sensing

capacitor. The following table (Table 4-1) lists some

recommended values for R_SENSEaccording to the

nominal operating current of the fan. Please note that

the current draw specified by the fan manufacturer may

be a worst-case rating and not the fan’s nominal oper-

ating current. If the fan current falls between two of the

values listed, it is recommended that the higher value

resistor is used.

4.2.1

THRESHOLD CALIBRATION USING

FAN’S FULL SCALE SPEED

The fan should first be run at full speed. At full speed,

the threshold voltage level should be adjusted until the

ALERT output is asserted. With this full-scale value of

the threshold voltage, the value can be scaled down to

the fan fault speed as a percentage of the full speed.

For example, if the fan full speed threshold voltage is

1.5V, then the fan fault threshold voltage at 30% of full

speed would be 30% x 1.5V = 0.45V.

4.2.2

THRESHOLD CALIBRATION USING

FAN’S MINIMUM ALLOWABLE

SPEED ESTIMATE

TABLE 4-1:

RECOMMENDED VALUES

FOR R_SENSEPER FIGURE 4-2

Nominal Fan Current

(mA)

R_SENSE()

For a more exact fan fault trip point, the user can run

the fan at its minimum allowed speed. At this speed, the

threshold voltage can be adjusted until the ALERT out-

put is asserted.

100

200

300

400

500

600

4.7

2.4

1.8

1.3

1.0

0.8

4.3

CLEAR Input

The CLEAR input allows the user to reset the ALERT

pin to a high status. This is an active-high input.

Consequently, as long as CLEAR is high, ALERT will

always be high as well. To allow ALERT to operate cor-

rectly, CLEAR must be held low. This feature can be

implemented so that false fan fault conditions do not

initiate system shutdown.

A 0.1 µF ceramic capacitor is recommended for

C_SENSE. Smaller capacitor values will require larger

sense resistors, whereas larger capacitors are more

expensive and occupy more board space.

4.2

THRESHOLD Input

4.4

ALERT Output

The voltage at the THRESHOLD input sets the

equivalent minimum allowable fan speed for the appli-

cation. As shown in Section 2.0, “Typical Performance

Curves”, the relationship between the threshold voltage

and minimum fan speed is also power supply and tem-

perature dependant.

The ALERT output is an open-drain output capable of

sinking 2.5 mA (typ). The ALERT output is asserted

whenever the detected fan speed equals or falls below

the equivalent voltage set at the threshold pin. The

ALERT output is only deactivated once the CLEAR pin

is brought to a high state. Although the absolute

maximum sink current of this pin is 25 mA, it is

recommended that the current sinking into the ALERT

output does not exceed 20 mA.

All the values for the threshold voltage that are shown in

these graphs represent typical numbers and might not

be optimized for all fans in all applications. To ensure

accurate fan speed monitoring of a specific fan in a spe-

cific application, the user must perform a one-time cor-

relation check with the prototype.

4.5

Power Supply Input (V

)

DD

To assure proper operation of the TC670 in a noisy

environment where the fans are running, the V_DDpin

(Pin 4) must be decoupled with a 0.1 µF capacitor, as

shown in Figure 4-1. This capacitor should be located

as close to the TC670 V_DDpin as possible, as well as

being promptly terminated to the ground plane. A

ceramic capacitor is recommended.

There are two techniques that can be used to calibrate

the system. One approach is to find the fan’s full-scale

capability and mathematically estimate the minimum

acceptable speed of the fan. A second technique is to

identify the fan’s minimum speed and calibrate the

threshold voltage accordingly.

4.6

Ground Terminal (GND)

The GND pin (Pin 2) of the TC670 should be connected

directly to the analog ground plane of the circuit board.

Care should be taken to keep this pin away from

switching signals, such as the fan excitation signals in

order to avoid false signals on the SENSE pin.

 2001-2012 Microchip Technology Inc.

DS21688D-page 7

TC670

5.0

PACKAGE INFORMATION

5.1

Package Marking Information

6-Pin SOT-23A (EIAJ SC-74) Device

6

5

4



1

2

3

1 & 2 = part number code

Part Number

TC670ECH

Code

DA

3 = year and quarter code

4 = lot ID number

5.2

Taping Form

Component Taping Orientation for 6-Pin SOT-23A (EIAJ SC-74) Devices

User Direction of Feed

Device

Marking

W

P

PIN 1

Carrier Tape, Number of Components Per Reel and Reel Size:

Package

6-Pin SOT-23A

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

8 mm

4 mm

3000

7 in.

DS21688D-page 8

 2001-2012 Microchip Technology Inc.

TC670

5.3

Package Dimensions (6-Pin SOT-23)

Note: For the most current package drawings, please see the Microchip Packaging Specification located

at http://www.microchip.com/packaging

E

E1

B

p1

D

n

1

c

A

A2

A1

L

Units

INCHES*

NOM

MILLIMETERS

NOM

Dimension Limits

MIN

MAX

MIN

MAX

n

p

Number of Pins

Pitch

6

.038

0.95

1.90

1.18

1.10

0.08

2.80

1.63

2.95

0.45

p1

A

Outside lead pitch (basic)

Overall Height

.075

.046

.043

.003

.110

.064

.116

.018

.035

.057

0.90

1.45

1.30

0.15

3.00

1.75

3.10

0.55

10

Molded Package Thickness

Standoff

A2

A1

E

.035

.000

.102

.059

.110

.014

.051

.006

.118

.069

.122

.022

10

0.90

0.00

2.60

1.50

2.80

0.35

Overall Width

Molded Package Width

Overall Length

E1

D

Foot Length

L

Foot Angle

0

5

0

5

c

Lead Thickness

Lead Width

.004

.014

.006

.017

.008

.020

10

0.09

0.35

0.15

0.43

0.20

0.50

10

B

Mold Draft Angle Top

Mold Draft Angle Bottom

0

5

0

5

0

5

10

0

5

10

*Controlling Parameter

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not

exceed .005" (0.127mm) per side.

JEITA (formerly EIAJ) equivalent: SC-74A

Drawing No. C04-120

 2001-2012 Microchip Technology Inc.

DS21688D-page 9

TC670

6.0

REVISION HISTORY

Revision D (December 2012)

Added a note to each package outline drawing.

DS21688D-page 10

 2001-2012 Microchip Technology Inc.

TC670

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO.

Device

X

XXXX

Examples:

a) TC670ECHTR: Predictive Fan Failure

Detector, SOT-23 package.

Temperature

Range

Package

Device:

TC670:

Predictive Fan Failure Detector

Temperature Range:

Package:

E

= -40°C to +85°C

CHTR: = SOT-23, Small Outline Transistor, 6-lead

(Tape and Reel only)

Sales and Support

Data Sheets

Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-

mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

1. Your local Microchip sales office

2. The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

Customer Notification System

Register on our web site (www.microchip.com/cn) to receive the most current information on our products.

 2001-2012 Microchip Technology Inc.

DS21688D-page11

TC670

NOTES:

DS21688D-page 12

 2001-2012 Microchip Technology Inc.

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

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32

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ISBN: 9781620768907

QUALITY MANAGEMENT SYSTEM

CERTIFIED BY DNV

Microchip received ISO/TS-16949:2009 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC^®MCUs and dsPIC^®DSCs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

== ISO/TS 16949 ==

 2001-2012 Microchip Technology Inc.

DS21688D-page 13

Worldwide Sales and Service

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://www.microchip.com/

support

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

India - Bangalore

Tel: 91-80-3090-4444

Fax: 91-80-3090-4123

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

Web Address:

www.microchip.com

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Japan - Osaka

Tel: 81-6-6152-7160

Fax: 81-6-6152-9310

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

China - Beijing

Tel: 86-10-8569-7000

Fax: 86-10-8528-2104

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Japan - Tokyo

Tel: 81-3-6880- 3770

Fax: 81-3-6880-3771

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

China - Chongqing

Tel: 86-23-8980-9588

Fax: 86-23-8980-9500

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

Korea - Seoul

China - Hangzhou

Tel: 86-571-2819-3187

Fax: 86-571-2819-3189

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

Cleveland

Independence, OH

Tel: 216-447-0464

Fax: 216-447-0643

China - Hong Kong SAR

Tel: 852-2943-5100

Fax: 852-2401-3431

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Indianapolis

Noblesville, IN

Tel: 317-773-8323

Fax: 317-773-5453

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Taiwan - Hsin Chu

Tel: 886-3-5778-366

Fax: 886-3-5770-955

Los Angeles

China - Shenzhen

Tel: 86-755-8864-2200

Fax: 86-755-8203-1760

Taiwan - Kaohsiung

Tel: 886-7-213-7828

Fax: 886-7-330-9305

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Taipei

Tel: 886-2-2508-8600

Fax: 886-2-2508-0102

Santa Clara

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Toronto

Mississauga, Ontario,

Canada

China - Xiamen

Tel: 905-673-0699

Fax: 905-673-6509

Tel: 86-592-2388138

Fax: 86-592-2388130

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

11/29/12

DS21688D-page 14

 2001-2012 Microchip Technology Inc.


型号：	TC670_13
厂家：	MICROCHIP
描述：	Tiny Predictive Fan Failure Detector 微小的预测风扇故障检测风扇
文件：	总14页 (文件大小：259K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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