HCS101 Data Sheet - Microchip Technology

 2001 Microchip Technology Inc. Preliminary DS41115B-page 1

FEATURES

Operating

• 2 Programmable 32-bit serial numbers

• 10-bit serial number

• 66-bit transmission code length

• Non-volatile 16-bit counter

• 3.5V -13.3V operation

• 3 inputs, 7 functions avai labl e

• Selectable baud rate

• Automatic code-word completion

• Battery low signal transmitted to receiver

Other

• Pin-out compatible with most Keeloq Encoders

• Simple prog ram mi ng inte rfac e

• On-chip EEPROM

• On-chip oscillator and timing components

• Button inputs have internal pulldown resistors

• Minimum External Components required

Typical Applications

The HCS101 is ideal for remote control applications.

These applications include:

• Low-end automotive alarm systems

• Low-end automotive immobilizers

• Gate and garage door openers

• Identity tokens

• Low-end burglar alarm systems

• Fan and lighting controls

•Toys

DESCRIPTION

The HCS 101 from Mi cro ch ip Technology Inc. is a fixed

code encoder designed for remote control systems. It

provide s a s ma ll pa ck age o utli ne and l ow c os t to mak e

this device a perfect solution for unidirectional remote

contr ol sy ste ms .

It is a lso pin comp atible with Mic rochip’ s HCS201 Cod e

Hopping Encoder allowing easy upgrading to a more

secure remote keyless entry ( RKE) system.

The HCS101 operates over a wide voltage range of

3.5V to 13.3V and has three button inputs in an 8-pin

configuration, which allows the system designer the

freedom to utilize up to 7 functions. The only compo-

nents req uired f or device operation are the butt ons and

RF circuitry, allowing a very low system cost.

PACKAGE TYPES

HCS101 BLOCK DIAGRAM

VDD

DATA

VSS

PDIP, SOIC

HCS101

VSS

VDD

Power

latching

and

switching

Button input port

Transmit register

EEPROM

DATA

S2 S1 S0

Oscillator

Reset Circuit Controller

Fixed Code Encoder HCS101

HCS101

DS41115B-page 2 Preliminary  2001 Microchip Technology Inc.

1.0 SYSTEM OVERVIEW

As indicated in the block diagram in Figure 1-1, the

HCS101 has a small EEPROM array, which must be

loaded with several parameters before use. These

paramet ers inclu de:

•Two 32-bit serial numbers

•16-bit counter value

•Additional 1 0-b it seri al num be r

•Configuration data

The EEPROM data f or each trans mitter is program med

by the manufacturer at the time of production.

Any type of con trol ler ma y be us ed as a recei ver, but it

is typically a microcontroller with compatible firmware

that allow s the receiver to operate in conjunction w ith a

transmitter, based on the HCS101.

FIGURE 1-1: BASIC OPERATION OF TRANSMITTER ENCODER

EEPROM Array

Serial Number 1

Transmitted Information

Serial Number 3

Counter

Serial

Number 3 Function

Bits

Function

Bits

Serial Number 1

 2001 Microchip Technology Inc. Preliminary DS41115B-page 3

HCS101

2.0 DEVICE OPERATION

As shown in the typical application circuits in

Figure 2-1, the HCS 101 is easy to us e. It requ ire s onl y

the addition of buttons and RF circuitry for use as the

transmitter in your application. A description of each pin

is gi ven in Table 2-1.

FIGURE 2-1: TYPICAL CIRCUITS

TABLE 2-1: PIN DESCRIPTIONS

The HCS101 will wake up upon detecting a switch clo-

sure and then delay for a debounce delay (TDB) as

shown in Figure 2-2. The device will then update the

16-bit counter before it loads the transmit register. The

data is then transmitted serially on the DATA pin in

Pulse Width Modulation (PWM) format.

If additio nal button s are press ed during a trans mission,

the current transmission is terminated. The HCS101

restar ts and the new t ransmissio n will contai n the latest

button information. When all buttons are released, the

device comple tes the current c ode-word and the n pow-

ers down. Released buttons do not terminate and/or

restart transmissions.

FIGURE 2-2: ENCODER OPERATION

Name Pin

Number Description

S0 1 Switch input 0

S1 2 Switch input 1

S2 3 Switch input 2/Clock pin for

programming mode

NC 4 No conne cti o n

VSS 5 Ground refe renc e con nection

DATA 6 Pulse width modulation (PWM)

output pin/Data pin for

programming mode

NC 7 No conne cti o n

VDD 8 Positive supply voltage connection

VDD

Tx out

VDD

DATA

VSS

2 button remote control

Tx out

VDD

DATA

VSS

4 button remote control

B3 B2 B1 B0

Note: Up to 7 functions can be implemented by pressing

more than one button simultaneously or by using a

suitable diode array.

VDD

Power Up

Reset and Debounce Delay

Sample Inputs

Update Counter

Load Transmit Register

Buttons

Added

All

Buttons

Released

(A button has been pressed)

Transmit

Stop

Yes

Complete Code

Word Transmission

HCS101

DS41115B-page 4 Preliminary  2001 Microchip Technology Inc.

3.0 TRANSMITTED WORD

3.1 Transmission Format (PWM Mode)

The HCS 101 tra nsmi ssion is made up o f seve ral cod e-

words as shown in Figure 3-1. Each code-word starts

with a preamble and a header, followed by the data.

The code- word is followed by a guard period be fore the

next code-word begins. The same code-word is trans-

mitted as long as the button is pressed. Refer to

Table 7-4 for transmission timing requirements.

3.2 Code-Word Organization

The HCS101 transmits a 66-bit code-word. The 66-bit

word is constructed from the serial numbers, counter

and function information. The code-word format is

shown in Figure 3-2.

Under normal conditions, serial number 1 is transmitted

with the counter and serial number 3. If all the buttons

are pressed, serial number 2 is transmitted in place of

the counter and serial number 3.

FIGURE 3-1: CODE-WORD TRANSMISSION FORMAT

FIGURE 3-2: CODE-WORD ORGANIZATION

LOGIC ‘0’

LOGIC ‘1’

Bit

Period

Preamble Header Counter, SER_3

and Function

Guard

Time

Tp Th Tg

Start Pulse

(Te)

SER_1

and Functi on

Serial Number 3

(10 bits)

Tran sm is si on D irec tio n

Serial Number 1

Function**

(0/4 bits) (32/28 bits)**

* See Section 4.3.6 , S3 Setting (S3SET )

** See Section 4.3.7 Extended Serial Number (XSER)

*** Serial Number 2 is transmitted when all buttons are pressed LSB first

S2 S1 S0 S3*

(16 bits)

Counter ‘00’

(2 bits)

Function

(4 bits)

‘1’

(1 bit) VLOW

(1 bit)

Serial Number 2***

(32 bits)

 2001 Microchip Technology Inc. Preliminary DS41115B-page 5

HCS101

4.0 EEPROM MEMORY

ORGANIZATION

The HCS101 contains 192 bits (12 x 16-bit words) of

EEPROM memory as shown in Table 4-1. Further

descriptions of the memory array are given in the fol-

lowing sections.

TABLE 4-1: EEPROM MEMORY MAP

4.1 CNTR (Counter)

This is the 16-bit gray code counter value that can be

used to track the number of times a transmitter has

been used.

4.2 SER_1, SER_2, SER_3 (Encoder

Serial Number)

SER_1, and SER_2 are the 32-bit device serial num-

bers. SER_3 is an additional 10-bit serial number trans-

mitted with every transmission. The most significant 6

bits of SER_3 are reserved and should be set to zero.

4.3 Configuration Word

The configuration word is a 16-bit word stored in the

EEPROM array that is used by the device to store the

status configuration options. Further explanations of

each of th e bi ts are des cribe d in the fo llo wing se ctions .

TABLE 4-2: CONFIGURATION WORD

4.3.1 OSCILLATOR TUNING BITS

(OSC0 TO OSC3)

These bits are used to tune the nominal frequency of

the HCS101 to within ±10% of its nominal value over

temperature and voltage.

4.3.2 LOW VOLTAGE TRIP POINT SELECT

(VLOWS)

The low voltage trip point s elect bit (VLOWS) and the S3

setting bit (S3SET) are used to determine the voltage

level for the low voltage detector.

* See also Section 4.3.6

4.3.3 BAUDRATE SEL ECT BITS (BRS)

BRS selects the speed of transmission and the code-

word blanking. Table 4-3 shows how the bit is used to

select the dif ferent bau d rates and Section 5.2 provi des

a detail ed exp la nati on in code-w o rd blan ki ng.

TABLE 4-3: BAUDRATE SELECT

WORD

ADDRESS MNEMONIC DESCRIPTION

0 RESERVED Set to 0000H

1 RESERVED Set to 0000H

2 RESERVED Set to 0000H

3 RESERVED Set to 0000H

4 CNTR Counter

5 RESERVED Set to 0000H

6 SER_1 Device Serial Number 1

(word 0)

7 SER_1 Device Serial Number 1

(word 1)

8 SER_2 Device Serial Number 2

(word 0)

9 SER_2 Device Serial Number 2

(word 1)

10 SER_3 Device Ser ial Number 3

11 CONFIG Config Word

Bit Number Bit Name

0OSC0

1OSC1

2OSC2

3OSC3

4VLOWS

5BRS

6MTX4

7 TXEN

8 S3SET

9 XSER

10 RESERVED

11 RESERVED

12 RESERVED

13 RESERVED

14 RESERVED

15 RESERVED

VLOWS S3SET* Trip Point

004.4

014.4

109

116.75

BRS Basic Pulse

Element Code-Words

Transmitted

0 400µs All

1 200µs 1 out of 2

HCS101

DS41115B-page 6 Preliminary  2001 Microchip Technology Inc.

4.3.4 MINIMUM FOUR TRANSMISSIONS (MTX4)

If this bit is cleared, a minimum of one code-word is

completed, when the HCS101 is activated. If this bit is

set, at l eas t fo ur c om ple te cod e-words are t rans m itte d.

4.3.5 TRANSMIT PULSE ENABLE (TXEN)

If this bit is cleared, no transmission pulse is transmit-

ted before a transmission. If the bit is set, a start pulse

(1 TE long) is transmitted before the preamble of the

first code-word.

4.3.6 S 3 SETTING (S 3SET)

This bit det ermines the value of S3 in the functio n code

during a transmission and the high trip point selected

by VLOWS in Section 4.3.2. I f thi s b it i s clea red, S3 m ir-

rors S2 during a transmission. If the S3SET bit is set,

S3 in the function code is always set, independent of

the value of S2.

4.3.7 EXTENDED SERIAL NUMBER (XSER)

If this bit is cleared the most significant four bits of the

HCS101’s s eria l num be r a re re placed w ith th e f unc tio n

code. If this bit is set, the full 32-bit serial number is

transmitted.

5.0 SPECIAL FEATURES

5.1 Code-W ord Completion

Code-word completion is an automatic feature that

ensures that the entire code-word is transmitted, even

if the bu tton is releas ed before the transmissi on is com-

plete. If the button is held down beyond the t ime for one

code-word, multiple code-words will result. If another

button is activated during a transmission, the active

transmission will be aborted and the new code will be

generated using the new button information.

5.2 Blank Alternate Code-Word

Federal Communications Commission (FCC) Rules,

Part 15 specify the limits on fundamental power and

harmoni cs th at can be tra nsmit ted. Powe r is c alcul ated

on the worst case average power transmitted in a

100ms window. It is therefore advantageous to mini-

mize the duty cycle of the transmission. This can be

achieved by minimizing the duty cycle of the individual

bits and by bla nk ing out conse cu tiv e w ord s. The trans -

mission d uty cycle can be lowered by setting BRS. Thi s

allows the user to transmit a hig her amplitude transmis-

sion, if the code-word length is shorter. This reduces

the average power transmitted and hence, assists in

FCC approv al of a transm itter dev ice. Wh en the high er

baud rate is selected, alternate code-words are not

transmitted as shown in Figure 5-1.

5.3 Auto-Shutoff

The auto-shutoff function automatically stops the

device from transmitting if a button inadvertently gets

pressed for longer than the time-out period, TTO. This

will p revent the de vice from dra ining the bat tery if a but-

ton gets pressed while the transmitter is in a pocket or

purse.

5.4 VLOW: Voltage LOW Indicator

The VLOW bit is transmitted with every transmission

and wi ll be tra nsmitted as a one i f the ope rating voltage

has dropped below the low voltage trip point. Refer to

Figure 3-2. The trip point is selectable based on the

battery voltage being used. See Section 4.3.2 for a

description of how the low voltage select option is set.

FIGURE 5-1: CODE-WORD TRANSMISSIONS

One Co de-Word

BRS = 0

BRS = 1

100ms 100ms 100ms 100ms

Amplitude

Time

 2001 Microchip Technology Inc. Preliminary DS41115B-page 7

HCS101

6.0 PROGRAMMING THE HCS101

When usin g the HCS10 1 in a system, the user will have

to program s om e pa ram ete rs i nto the de vi ce, inc lu din g

the serial number and the counter, before it can be

used. The programming cycle allows the user to input

192 bits in a serial data stream, which are then stored

internal ly in EEPROM. Pro gramming wi ll be in itiated b y

forcing the DATA line high, after the S2 line has been

held high for the appropriate length of time. Refer to

Table 6-1 and Figure 6-1.

After the program mode is entered, a delay must be

provided to the dev ice for the au tomatic bulk write cycle

to complet e. This will writ e all locations in the EEPROM

to an all zeros pattern. The device can then be pro-

gramm ed by clocki ng in 16 bits at a time, using S2 as

the clock line and DATA as the data in line. After each

16-bit word is loaded, a programming delay is required

for the internal program cycle to complete. This delay

can take up to Twc.

The HCS101 will signal that the write is complete by

sending out a train of ACK pulses, TACKH high, TACKL

low on DATA. The ACK pulses will continue until S2 is

dropped. These times can be used to calculate the

oscillator calibration value. The first pulse’s width

should NOT be used for calibration.

At the end of the prog ramming cycle, the de vice can be

verified as shown in Figure 6-2 by reading back the

EEPROM. Readin g is don e by clocking t he S2 l ine an d

reading the data bits on the DATA pin. A verify opera-

tion can only be done once, immediately following

the program cycle.

FIGURE 6-1: PROGRAMMING WAVEFORMS

FIGURE 6-2: VERIFY WAVEFORMS

Note: To ensure that the device does not acci-

dentally enter programming mode, DATA

should never be pulled high by the circuit

connected to it. Special care should be

tak en when driving PN P RF transistors.

DATA

Enter Progra m

Mode

(Data)

(Clock)

Note: S0 and S1 button inputs to be held to ground during the entire programming sequence.

Bit 0 Bit 1 Bit 2 Bit 3 Bit 14 Bit 15 Bit 16 Bit 17

TPH1

TPBW

TPS

Repeat 12 times for each word

TPH2

TCLKH

TCLKL TWC

TDS

Data for Word 1

TDH

TCLKL

Initiate Data Polling Here

Write Cycle

Complete Here

TACLKL

TACLKH

Calibration Pulses

TPHOLD

DATA

(Clock)

(Data)

Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.

End of

Programming Cycle Begin Verify Cycle Here

Bit 1 Bit 2 Bit 3 Bit 15

Bit 14 Bit 16 Bit 17 Bit190Bit191

TWC

Data in Word 0

TDV

Bit 0Bit191Bit190

HCS101

DS41115B-page 8 Preliminary  2001 Microchip Technology Inc.

TABLE 6-1: PROGRAMMING/VERIFY TIMING REQUIREMENTS

VDD = 5.0V ± 10%

25° C ± 5°C

Parameter Symbol Min. Max. Units

Program mode setup time TPS 2—ms

Hold time 1 TPH15.0 —ms

Hold time 2 TPH250 —µs

Bulk Write time TPBW —2.2 ms

Prog ram delay time TPROG —2.2 ms

Program cycle time TWC —36 ms

Clock low time TCLKL 25 —µs

Clock high time TCLKH 25 —µs

Data setup time TDS 0—µs

Data hold time TDH 30 —µs

Data out valid time TDV 10 30 µs

Hold time TPHOLD 100 —µs

Acknowledge low time TACKL 800 —µs

Acknowledge high time TACKH 800 —µs

 2001 Microchip Technology Inc. Preliminary DS41115B-page 9

HCS101

7.0 ELECTRICAL CHARACTERISTICS

TABLE 7-1: ABSOLUTE MAXIMUM RATINGS

TABLE 7-2: DC CHARACTERISTICS

Symbol Item Rating Units

VDD Supply voltage -0.3 to 13 .5 V

VIN Input voltage -0.3 to VDD + 0.3 V

VOUT Output voltage -0.3 to VDD + 0.3 V

IOUT Max output curr ent 50 mA

TSTG Storage temperature -55 to +125 C (Note)

TLSOL Lead soldering temp 300 C (Note)

VESD ESD rating 2000 V

Note: Stresses above those listed under “ABSOLUTE MAXIMUM RATINGS” may cause permanent damage to

the device.

Commercial (C): TAMB = 0°C to +70°C Industrial (I):TAMB = -40°C to +85°C

3.5V < VDD < 5.0V 5.0V < VDD < 13.3V

Parameter Sym. Min. Typ1Max. Min. Typ1Max. Unit Conditions

Operati ng current

(avg)(2) ICC —0.5 —2mA

Standby current ICCS 0.1 1.0 0.1 1.0 µA

Auto-shutoff cur-

rent(3,4) ICCS 40 75 160 300 µA

High level Input volt-

age VIH 0.55VDD VDD+0.3 2.75 VDD+0.3 V

Low level input voltage VIL -0.3 0.15VDD -0.3 0.75 V

High lev el outp ut vol t-

age VOH 0.6VDD 3.3 V

VIOH = -1.0 mA VDD = 3.5V

IOH = -2.0 mA VDD = 10V

Low level output volt-

age VOL 0.08VDD 0.4 V

VIOL = 1.0 mA VDD = 3.5V

IOL = 2.0 mA VDD = 10V

Resistance; S0-S2 RSO-240 60 80 40 60 80 kΩVDD = 4.0V

Resistance; DATA RDATA 80 120 160 80 120 160 kΩVDD = 4.0V

Note 1: Typical values are at 25°C.

2: No load.

3: Auto-shutoff current specification does not include the current through the input pulldown resistors.

4: Auto-shutoff current is periodically sampled and not 100% tested.

HCS101

DS41115B-page 10 Preliminary  2001 Microchip Technology Inc.

TABLE 7-3: AC CHARACTERISTICS

FIGURE 7-1: POWER UP AND TRANSMIT TIMING

FIGURE 7-2: PREAMBLE/HEADER FORMAT

FIGURE 7-3: DATA WORD FORMAT (XSER = 0)

Standard Operating Conditi ons (unle ss otherwis e speci fied):

Commercial (C): 0°C ≤ TA ≤ +70°C

Industrial (I): -40°C ≤ TA ≤ +85°C

Symbol Parameters Min. Typ. Max. Units Conditions

TBP Time to second button press 10 + Code

Wo rd Time —26 + Code

Word Time ms (Note 1)

TTD Tran sm it de la y fro m bu tton dete ct 12 —26 ms

TDB Debounc e del ay 6 —20 ms

TTO Auto-shutoff time-out period —27 —s(Note 2)

Ts Start pulse delay —4.5 —ms

Note 1: TBP is the time in which a second button can be pressed without completion of the first code-word and the

intention was to press the combination of buttons.

2: The auto shutoff timeout period is not tested.

Button Press Detect

TDB

DATA

TTD

Code-Word Transmission

TTO

Code

Word

Code

Word

Code

Word

Code

Word

TBP

Preamble Header

P1 P12

24 TE10 TE

Data Word

Transmission

Bit 0 Bit 1

Header

Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59

Guard

LSB

LSB MSB MSB S3* S0 S1 S2 Vlow

Ti me

Serial Number 1 Function C ode Sta tus

Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65

* See S3SET

Counter & Serial Number 3

& Function Code

 2001 Microchip Technology Inc. Preliminary DS41115B-page 11

HCS101

TABLE 7-4: CODE-W ORD TRANSMISSION TIMING REQUIREMENTS

VDD = +3.5 to 13.3V

Commercial (C): TAMB = 0°C to +70°C

Industri al (I): TAMB = -40°C to +85°C

Code-Words Transmitted

All 1 out of 2

Symbol Characteristic Number of TEMin. Typ. Max. Min. Typ. Max. Units

TEBasic pulse element 1 360 400 440 180 200 220 µs

TBP PWM bit pulse width 3 —3—— 3—ms

TPPreamble duration 24 8.64 9.6 10.56 4.32 4.8 5.28 ms

THHeader duration 10 3.6 4.0 4.4 1.8 2.0 2.2 ms

THOP Hopping code duration 96 34.56 38.4 42.24 17.28 19.2 21.12 ms

TFIX Fixed code duration 102 36.72 40.8 44.88 18.36 20.4 22.44 ms

TGGuard Time 39 14.04 15.6 17.16 7.02 7.8 8.58 ms

Total Transmit Time 271 97.56 108.4 119.24 48.78 54.2 59.62 ms

PWM data rate 925 833 757 1851 1667 1515 bps

Note: The timing parameters are not tested but derived from the oscillator clock.

HCS101

DS41115B-page 12 Preliminary  2001 Microchip Technology Inc.

NOTES:

 2001 Microchip Technology Inc. Preliminary DS41115B-page 13

HCS101

NOTES:

HCS101

DS41115B-page 14 Preliminary  2001 Microchip Technology Inc.

HCS101 PRODUCT IDENTIFICATION SYSTEM

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

Sales and Support

Package: P = Plastic DIP (300 mil Body), 8-lead)

SN = Plastic SOIC (150 mil Body), 8-lead

Tem perature Blank = 0°C to +70°C

Range: I=–40°C to +85 °C

Device: HCS101 =Code Hopping Encoder

HCS101T =Code Hopping Encoder (Tape and Reel)

HCS101 - /P

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 Corporate Literature Center U.S. FAX: (480) 792-7277.

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

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

New Customer Notification System

 2001 Microchip Technology Inc. Preliminary DS41115B-page 15

HCS101

Technology Incorporated, USA. Information contained

in this publication regarding devi ce applications an d the

like is intended through suggestion only and may be

superse ded by updates . No repr esent ati on or warrant y

is given and no liabil ity is assume d by Microchip

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Trademarks

The Microchip name, logo, PIC, PICmicro,

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SEEVAL, MPLAB and The Embedd ed Control

Solutions Company are registered trademarks of

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SelectMode and microPort are trademarks of

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All other trademarks mentioned herein are property of

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Microchip received QS-9000 quality system

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Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by

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DS41115B-page 16 Preliminary  2001 Microchip Technology Inc.

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Detroit

Tri-Atria Office Building

32255 Northwestern Highway, Suite 190

Farmington Hills, MI 48334

Tel: 248-538-2250 Fax: 248-538-2260

Los A n ge les

18201 Von Karman, Suite 1090

Irvine, CA 92612

Tel: 949-2 63- 188 8 Fax: 949- 263 -13 38

Mountain View

Analog Product Sales

1300 Terra Bella Avenue

Mountain V iew, CA 94043-1836

Tel: 650-9 68- 924 1 Fax: 650- 967 -15 90

New York

150 Motor Parkway, Suite 202

Hauppauge, NY 11788

Tel: 631-273-5305 Fax: 631-273-5335

San Jose

Microchip Technology Inc.

2107 North First Street, Suite 590

San Jose, CA 95131

Tel: 408-436-7950 Fax: 408-436-7955

Toronto

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Australia

Microchip Technology Australia Pty Ltd

Suite 22, 41 Rawson Street

Epping 212 1, NSW

Australia

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Be ij ing

Microchip Technology Beijing Office

Unit 915

New China Hong Kong Manhattan Bldg.

No. 6 Chaoyangmen Beidajie

Beijing, 100027, No. China

Tel: 86-10-85282100 Fax: 86-10-85282104

China - Shanghai

Microchip Technology Shanghai Office

Room 701, Bldg. B

Far East Internat ional Plaza

No. 317 Xian Xia Road

Shanghai, 200051

Tel: 86-21-6275-5700 Fax: 86-21-6275-5060

Hong Kong

Microchip Asia Pacific

RM 2101, Tower 2, Metroplaza

223 Hing Fong Road

Kwai Fong, N.T., Hong Kong

Tel: 852-2401-1200 Fax: 852-2401-3431

India

Microchip Technology Inc.

India Liaiso n Office

Divyasree Chambers

1 Floor, Wing A (A3/ A4)

No. 11, O’Shaugnessey Road

Bangalore, 560 025, India

Tel: 91-80-2290061 Fax: 91-80-2290062

Japan

Microchip Technology Intl. Inc.

Benex S-1 6F

3-18-20, Shinyokohama

Kohoku -Ku, Yokohama-shi

Kanaga wa, 222 -0 033 , Japan

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

ASIA/PACIFIC (continued)

Korea

Microc hip Technol o gy Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Ko re a

Tel: 82-2-554-7200 Fax: 82-2-558-5934

Singapore

Microchip Technology Singapore Pte Ltd.

200 Midd le Ro ad

#07-02 Prime Centre

Singapore, 188980

Tel: 65-334-887 0 Fax: 65-334-8850

Taiwan

Microc hip Technol o gy Taiwan

11F-3, No. 207

Tung Hua North Road

Taipei, 105, Taiwan

Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

EUROPE

Denmark

Microchip Technology Denmark ApS

Regus Business Centre

Lautrup hoj 1-3

Ballerup DK-2750 Denmark

Tel: 45 4420 9895 Fax: 45 4420 9910

France

Arizona Microchip Technology SARL

Parc d’Activite du Moulin de Massy

43 Rue du Saule Trapu

Batiment A - ler Et age

91300 Massy, France

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90 - 79

Germany

Arizona Microchip Technology GmbH

Gustav-Heinemann Ring 125

D-81739 Munich, Germany

Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Germany

Analog Product Sales

Lochhamer Strasse 13

D-82152 Martinsried, Germany

Tel: 49-89-895650-0 Fax: 49-89-895650-22

Italy

Arizona Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Milan, Italy

Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom

Arizona Microchip Technology Ltd.

505 Eskdale Road

Winnersh Triangle

Wokingham

Berksh ire, E ngla nd RG 41 5TU

Tel: 44 118 921 5869 Fax: 44-118 921-5820

01/30/01

WORLDWIDE SALES AND SERVICE