HCS201T-I/SN_技术文档

HCS201

®

KEELOQ Code Hopping Encoder

FEATURES

Security

DESCRIPTION

The HCS201 from Microchip Technology Inc. is a code

hopping encoder designed for secure Remote Keyless

Entry (RKE) systems. The HCS201 utilizes the KEELOQ

code hopping technology, incorporating high security, a

small package outline and low cost. The HCS201 is a

perfect solution for unidirectional remote keyless entry

systems and access control systems.

• Programmable 28-bit serial number

• Programmable 64-bit encryption key

• Each transmission is unique

• 66-bit transmission code length

• 32-bit hopping code

• 34-bit fixed code (28-bit serial number,

4-bit button code, 2-bit status)

PACKAGE TYPES

• Encryption keys are read protected

PDIP, SOIC

8

7

6

5

V

DD

S0

S1

1

2

3

4

Operating

STEP

DATA

• 3.5V-13V operation

(2.0V min. using the Step up feature)

S2

VSS

• Three button inputs

V

DDB

• 7 functions available

• Selectable baud rate

• Automatic code word completion

• Battery low signal transmitted to receiver

• Non-volatile synchronization data

HCS201 BLOCK DIAGRAM

VDDB

Step Up

Controller

VDD

STEP

Other

Power

latching

and

Oscillator

• Simple programming interface

• On-chip EEPROM

Controller

switching

RESET circuit

• On-chip oscillator and timing components

• Button inputs have internal pull-down resistors

• Minimum component count

EEPROM

Encoder

• Synchronous Transmission mode

• Built-in step up regulator

DATA

32-bit shift register

Typical Applications

V

SS

Button input port

S₂S₁S₀

• The HCS201 is ideal for Remote Keyless Entry

(RKE) applications. These applications include:

V

DD

• Automotive RKE systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage door openers

• Identity tokens

The HCS201 combines a 32-bit hopping code,

generated by a nonlinear encryption algorithm, with a

28-bit serial number and 6 information bits to create a

66-bit code word. The code word length eliminates the

threat of code scanning and the code hopping mecha-

nism makes each transmission unique, thus rendering

code capture and resend schemes useless.

• Burglar alarm systems

2001 Microchip Technology Inc.

DS41098C-page 1

HCS201

The crypt key, serial number and configuration data are

stored in an EEPROM array which is not accessible via

any external connection. The EEPROM data is pro-

grammable but read-protected. The data can be veri-

fied only after an automatic erase and programming

operation. This protects against attempts to gain

access to keys or manipulate synchronization values.

The HCS201 provides an easy-to-use serial interface

for programming the necessary keys, system parame-

ters and configuration data.

• Learn – Learning involves the receiver calculating

the transmitter’s appropriate crypt key, decrypting

the received hopping code and storing the serial

number, synchronization counter value and crypt

key in EEPROM. The KEELOQ product family facil-

itates several learning strategies to be imple-

mented on the decoder. The following are

examples of what can be done.

- Simple Learning

The receiver uses a fixed crypt key, common

to all components of all systems by the same

manufacturer, to decrypt the received code

word’s encrypted portion.

1.0

SYSTEM OVERVIEW

Key Terms

- Normal Learning

The receiver uses information transmitted

during normal operation to derive the crypt

key and decrypt the received code word’s

encrypted portion.

The following is a list of key terms used throughout this

data sheet. For additional information on KEELOQ and

Code Hopping, refer to Technical Brief 3 (TB003).

• RKE - Remote Keyless Entry

- Secure Learn

• Button Status - Indicates what button input(s)

activated the transmission. Encompasses the 4

button status bits S3, S2, S1 and S0 (Figure 4-2).

The transmitter is activated through a special

button combination to transmit a stored 60-bit

seed value used to generate the transmitter’s

crypt key. The receiver uses this seed value

to derive the same crypt key and decrypt the

received code word’s encrypted portion.

• Code Hopping - A method by which a code,

viewed externally to the system, appears to

change unpredictably each time it is transmitted.

• Code word - A block of data that is repeatedly

transmitted upon button activation (Figure 4-1).

• Manufacturer’s code – A unique and secret 64-

bit number used to generate unique encoder crypt

keys. Each encoder is programmed with a crypt

key that is a function of the manufacturer’s code.

Each decoder is programmed with the manufac-

turer code itself.

• Transmission - A data stream consisting of

repeating code words (Figure 8-1).

• Crypt key - A unique and secret 64-bit number

used to encrypt and decrypt data. In a symmetri-

cal block cipher such as the KEELOQ algorithm,

the encryption and decryption keys are equal and

will therefore be referred to generally as the crypt

key.

The HCS201 code hopping encoder is designed specif-

ically for keyless entry systems; primarily vehicles and

home garage door openers. The encoder portion of a

keyless entry system is integrated into a transmitter,

carried by the user and operated to gain access to a

vehicle or restricted area. The HCS201 is meant to be

a cost-effective yet secure solution to such systems,

requiring very few external components (Figure 2-1).

• Encoder - A device that generates and encodes

data.

• Encryption Algorithm - A recipe whereby data is

scrambled using a crypt key. The data can only be

interpreted by the respective decryption algorithm

using the same crypt key.

Most low-end keyless entry transmitters are given a

fixed identification code that is transmitted every time a

button is pushed. The number of unique identification

codes in a low-end system is usually a relatively small

number. These shortcomings provide an opportunity

for a sophisticated thief to create a device that ‘grabs’

a transmission and retransmits it later, or a device that

quickly ‘scans’ all possible identification codes until the

correct one is found.

• Decoder - A device that decodes data received

from an encoder.

• Decryption algorithm - A recipe whereby data

scrambled by an encryption algorithm can be

unscrambled using the same crypt key.

The HCS201, on the other hand, employs the KEELOQ

code hopping technology coupled with a transmission

length of 66 bits to virtually eliminate the use of code

‘grabbing’ or code ‘scanning’. The high security level of

the HCS201 is based on the patented KEELOQ technol-

ogy. A block cipher based on a block length of 32 bits

and a key length of 64 bits is used. The algorithm

obscures the information in such a way that even if the

transmission information (before coding) differs by only

one bit from that of the previous transmission, the next

DS41098C-page 2

2001 Microchip Technology Inc.

HCS201

coded transmission will be completely different. Statis-

tically, if only one bit in the 32-bit string of information

changes, greater than 50 percent of the coded trans-

mission bits will change.

The crypt key generation typically inputs the transmitter

serial number and 64-bit manufacturer’s code into the

key generation algorithm (Figure 1-2). The manufac-

turer’s code is chosen by the system manufacturer and

must be carefully controlled as it is a pivotal part of the

overall system security.

As indicated in the block diagram on page one, the

HCS201 has a small EEPROM array which must be

loaded with several parameters before use; most often

programmed by the manufacturer at the time of produc-

tion. The most important of these are:

• A 28-bit serial number, typically unique for every

encoder

• A crypt key

• An initial 16-bit synchronization value

• A 16-bit configuration value

FIGURE 1-1:

CREATION AND STORAGE OF CRYPT KEY DURING PRODUCTION

Production

Programmer

HCS201

Transmitter

Serial Number

EEPROM Array

Serial Number

Crypt Key

Sync Counter

.

Key

Crypt

Key

.

Manufacturer’s

Code

Generation

Algorithm

The 16-bit synchronization counter is the basis behind

the transmitted code word changing for each transmis-

sion; it increments each time a button is pressed. Due

to the code hopping algorithm’s complexity, each incre-

ment of the synchronization value results in greater

than 50% of the bits changing in the transmitted code

word.

A transmitter must first be ‘learned’ by the receiver

before its use is allowed in the system. Learning

includes calculating the transmitter’s appropriate crypt

key, decrypting the received hopping code and storing

the serial number, synchronization counter value and

crypt key in EEPROM.

In normal operation, each received message of valid

format is evaluated. The serial number is used to deter-

mine if it is from a learned transmitter. If from a learned

transmitter, the message is decrypted and the synchro-

nization counter is verified. Finally, the button status is

checked to see what operation is requested. Figure 1-3

shows the relationship between some of the values

stored by the receiver and the values received from

the transmitter.

Figure 1-2 shows how the key values in EEPROM are

used in the encoder. Once the encoder detects a button

press, it reads the button inputs and updates the syn-

chronization counter. The synchronization counter and

crypt key are input to the encryption algorithm and the

output is 32 bits of encrypted information. This data will

change with every button press, its value appearing

externally to ‘randomly hop around’, hence it is referred

to as the hopping portion of the code word. The 32-bit

hopping code is combined with the button information

and serial number to form the code word transmitted to

the receiver. The code word format is explained in

greater detail in Section 4.0.

A receiver may use any type of controller as a decoder,

but it is typically a microcontroller with compatible firm-

ware that allows the decoder to operate in conjunction

with an HCS201 based transmitter. Section 7.0

provides detail on integrating the HCS201 into a sys-

tem.

2001 Microchip Technology Inc.

DS41098C-page 3

HCS201

FIGURE 1-2:

BUILDING THE TRANSMITTED CODE WORD (ENCODER)

EEPROM Array

Crypt Key

KEELOQ

Encryption

Algorithm

Sync Counter

Serial Number

Button Press

Serial Number

Information

32 Bits

Encrypted Data

Transmitted Information

FIGURE 1-3:

BASIC OPERATION OF RECEIVER (DECODER)

1

Received Information

EEPROM Array

32 Bits of

Encrypted Data

Button Press

Information

Manufacturer Code

Serial Number

Check for

Match

Serial Number

2

Sync Counter

Crypt Key

3

KEELOQ

Decryption

Algorithm

Decrypted

Synchronization

Counter

Check for

Match

4

Perform Function

Indicated by

5

button press

NOTE: Circled numbers indicate the order of execution.

DS41098C-page 4

2001 Microchip Technology Inc.

HCS201

TABLE 2-1:

PIN DESCRIPTIONS

Pin Description

Switch input 0

2.0

ENCODER OPERATION

As shown in the typical application circuits (Figure 2-1),

the HCS201 is a simple device to use. It requires only

the addition of buttons and RF circuitry for use as the

transmitter in your security application. A description of

each pin is given in Table 2-1.

Name Number

S0

S1

S2

1

2

3

Switch input 1

Switch input 2 / Clock pin for

Programming mode

FIGURE 2-1:

TYPICAL CIRCUITS

VDD

VDDB

4

Battery input pin, supplies power

to the step up control circuitry

VSS

5

6

Ground reference connection

DATA

Pulse Width Modulation (PWM)

output pin / Data pin for

Programming mode

B0

B1

S0

VDD

STEP

S1

Tx out

S2

DATA

VSS

STEP

VDD

7

8

Step up regulator switch control

Positive supply voltage

VDDB

The HCS201 will wake-up upon detecting a button

press and delay approximately 10 ms for button

debounce (Figure 2-2). The synchronization counter,

discrimination value and button information will be

encrypted to form the hopping code. The hopping code

portion will change every transmission, even if the

same button is pushed again. A code word that has

been transmitted will not repeat for more than 64K

transmissions. This provides more than 18 years of use

before a code is repeated; based on 10 operations per

day. Overflow information sent from the encoder can be

used to extend the number of unique transmissions to

more than 192K.

Two button remote control

VDD

B3 B2 B1 B0

S0

VDD

STEP

DATA

VSS

S1

Tx out

S2

VDDB

If in the transmit process it is detected that a new but-

ton(s) has been pressed, a RESET will immediately

occur and the current code word will not be completed.

Please note that buttons removed will not have any

effect on the code word unless no buttons remain

pressed; in which case the code word will be completed

and the power-down will occur.

Four button remote control

VDD

L

D

S0

VDD

R

STEP

S1

S2

Q

C

Tx out

DATA

VSS

VDDB

2.0-6.0V

Three button remote control with Step up regulator

External components sample values:

R = 5.1 KΩ

L = 390 uH

Q = 2N3904

C = 1.0 uF

D = ZHCS400CT (40V 0.4A Zetex)

(see Section 5.6 for a description of the Step Up circuit)

Note:

Up to 7 functions can be implemented by pressing

more than one button simultaneously or by using a

suitable diode array.

2001 Microchip Technology Inc.

DS41098C-page 5

HCS201

FIGURE 2-2:

ENCODER OPERATION

3.0

EEPROM MEMORY

ORGANIZATION

Power-Up

(A button has been pressed)

The HCS201 contains 192 bits (12 x 16-bit words) of

EEPROM memory (Table 3-1). This EEPROM array is

used to store the encryption key information, synchro-

nization value, etc. Further descriptions of the memory

array is given in the following sections.

RESET and Debounce Delay

(10 ms)

Sample Inputs

TABLE 3-1:

EEPROM MEMORY MAP

Update Sync Info

WORD

ADDRESS

MNEMONIC

DESCRIPTION

Encrypt With

Crypt Key

0

1

2

3

4

KEY_0

64-bit encryption key

(word 0)

Load Transmit Register

Transmit

KEY_1

KEY_2

KEY_3

SYNC

64-bit encryption key

(word 1)

64-bit encryption key

(word 2)

Buttons

Added

?

Yes

64-bit encryption key

(word 3)

16-bit synchronization

value

No

All

Buttons

Released

?

5

6

RESERVED Set to 0000H

SER_0

Device Serial Number

(word 0)

Yes

7

SER_1

Device Serial Number

(word 1)

Complete Code

Word Transmission

8

9

SEED_0

SEED_1

DISC

Seed Value (word 0)

Seed Value (word 1)

Discrimination Word

Config Word

Stop

10

11

CONFIG

3.1

KEY_0 - KEY_3 (64-Bit Crypt Key)

The 64-bit crypt key is used to create the encrypted

message transmitted to the receiver. This key is calcu-

lated and programmed during production using a key

generation algorithm. The key generation algorithm

may be different from the KEELOQ algorithm. Inputs to

the key generation algorithm are typically the transmit-

ter’s serial number and the 64-bit manufacturer’s code.

While the key generation algorithm supplied from

Microchip is the typical method used, a user may elect

to create their own method of key generation. This may

be done providing that the decoder is programmed with

the same means of creating the key for

decryption purposes.

3.2

SYNC (Synchronization Counter)

This is the 16-bit synchronization value that is used to

create the hopping code for transmission. This value

will increment after every transmission.

DS41098C-page 6

2001 Microchip Technology Inc.

HCS201

serial number then it may merely be compared to the

respective bits of the received serial number; saving

EEPROM space.

3.3

Reserved

Must be initialized to 0000H.

3.4

SER_0, SER_1

(Encoder Serial Number)

3.7

CONFIG

(Configuration Word)

SER_0 and SER_1 are the lower and upper words of

the device serial number, respectively. Although there

are 32 bits allocated for the serial number, only the

lower order 28 bits are transmitted. The serial number

is meant to be unique for every transmitter.

The Configuration Word is a 16-bit word stored in

EEPROM array that is used by the device to store infor-

mation used during the encryption process, as well as

the status of option configurations. Further explana-

tions of each of the bits are described in the following

sections.

3.5

SEED_0, SEED_1 (Seed Word)

TABLE 3-3:

Bit Number

CONFIGURATION WORD

Bit Name

The 2-word (32-bit) seed code will be transmitted when

all three buttons are pressed at the same time (see

Figure 4-2). This allows the system designer to imple-

ment the secure learn feature or use this fixed code

word as part of a different key generation/tracking pro-

cess.

0

1

2

OSC0

OSC1

OSC2

3

4

5

6

7

8

9

10

11

12

13

14

15

OSC3

VLOWS

BRS

MTX4

TXEN

TABLE 3-2:

Bit Number

DISCRIMINATION WORD

Bit Description

0

1

2

3

4

5

6

7

8

Discrimination Bit 0

Discrimination Bit 1

Discrimination Bit 2

Discrimination Bit 3

Discrimination Bit 4

Discrimination Bit 5

Discrimination Bit 6

Discrimination Bit 7

Discrimination Bit 8

Discrimination Bit 9

Discrimination Bit 10

Discrimination Bit 11

Not Used

S3SET

XSER

Not Used

9

10

11

12

13

14

15

3.7.1

OSCILLATOR TUNING BITS

(OSC0 AND OSC3)

These bits are used to tune the frequency of the

HCS201 internal clock oscillator to within ±10% of its

nominal value over temperature and voltage.

Not Used

3.7.2

LOW VOLTAGE TRIP POINT

SELECT (VLOWS)

3.6

DISC

(Discrimination Word)

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

setting bit (S3SET) are used to determine when to send

the VLOW signal to the receiver.

The discrimination value aids the post-decryption

check on the decoder end. It may be any value, but in

a typical system it will be programmed as the 12 Least

Significant bits of the serial number. Values other than

this must be separately stored by the receiver when a

transmitter is learned. The discrimination bits are part

of the information that form the encrypted portion of

the transmission (Figure 4-2). After the receiver has

decrypted a transmission, the discrimination bits are

checked against the receiver’s stored value to verify

that the decryption process was valid. If the discrimi-

nation value was programmed as the 12 LSb’s of the

TABLE 3-4:

TRIP POINT SELECT

VLOWS

S3SET*

Trip Point

0

1

0

1

0

1

4.4

9

6.75

* See also Section 3.7.6

2001 Microchip Technology Inc.

DS41098C-page 7

HCS201

3.7.3

BAUD RATE SELECT BITS (BRS)

BRS selects the speed of transmission and the code

word blanking. Table 3-5 shows how the bit is used to

select the different baud rates and Section 5.5 provides

detailed explanation in code word blanking.

TABLE 3-5:

BRS

BAUDRATE SELECT

Basic Pulse Code Words

Element

Transmitted

0

1

400 µs

All

200 µs

1 out of 2

3.7.4

MINIMUM FOUR TRANSMISSIONS

(MTX4)

If this bit is cleared, only one code is completed if the

HCS201 is activated. If this bit is set, at least four com-

plete code words are transmitted, even if code word

blanking is enabled.

3.7.5

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 after button de-bounc-

ing, before the preamble of the first code word.

3.7.6

S3 SETTING (S3SET)

This bit determines the value of S3 in the function code

during a transmission and the high trip point selected

by VLOWS in section 3.6.2. If this bit is cleared, S3 mir-

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

S3 in the function code (Button Status) is always set,

independent of the value of S2.

3.7.7

EXTENDED SERIAL NUMBER

(XSER)

If this bit is set, a long 32-bit Serial Number is transmit-

ted. If this bit is cleared, a standard 28-bit Serial Number

is transmitted followed by 4 bits of the function code

(Button Status).

DS41098C-page 8

2001 Microchip Technology Inc.

HCS201

4.2

Code Word Organization

4.0

4.1

TRANSMITTED WORD

Code Word Format

The HCS201 transmits a 66-bit code word when a

button is pressed. The 66-bit word is constructed from

a Fixed Code portion and an Encrypted Code portion

(Figure 4-2).

The HCS201 code word is made up of several parts

(Figure 4-1). Each code word contains a 50% duty

cycle preamble, a header, 32 bits of encrypted data and

34 bits of fixed data followed by a guard period before

another code word can begin. Refer to Table 8-4 for

code word timing.

The 32 bits of Encrypted Data are generated from 4

button bits, 12 discrimination bits and the 16-bit sync

value. The encrypted portion alone provides up to four

billion changing code combinations.

The 34 bits of Fixed Code Data are made up of 2 sta-

tus bits, 4 button bits and the 28-bit serial number. The

fixed and encrypted sections combined increase the

number of code combinations to 7.38 x 10¹⁹

.

FIGURE 4-1:

CODE WORD FORMAT

TE TE

TE

LOGIC ‘0’

LOGIC ‘1’

Bit

Period

50% Duty Cycle

Preamble

TP

Encrypted Portion

of Transmission

Fixed Portion of

Transmission

TFIX

Guard

Time

TG

Header

TH

THOP

FIGURE 4-2:

CODE WORD ORGANIZATION

34 bits of Fixed Portion

32 bits of Encrypted Portion

VLOW

(1 bit)

Button

Status

Serial Number

(28 bits)

Button

Status

DISC

(12 bits)

Sync Counter

(16 bits)

1

S2 S1 S0 S3

MSb

LSb

66 Data bits

Transmitted

LSb first.

VLOW

(1 bit)

Button

Status

Serial Number

(28 bits)

SEED

(32 bits)

1

1 1 1

MSb

SEED replaces Encrypted Portion when all button inputs are activated at the same time.

2001 Microchip Technology Inc.

DS41098C-page 9

HCS201

The button code will be the S0, S1 value at the falling

edge of S2 or S3. The timing of the PWM data string is

controlled by supplying a clock on S2 or S3 and should

not exceed 20 kHz. The code word is the same as in

PWM mode with 16 reserved bits at the end of the

word. The reserved bits can be ignored. When in Syn-

chronous Transmission mode S2 or S3 should not be

toggled until all internal processing has been com-

pleted as shown in Figure 4-4.

4.3

Synchronous Transmission Mode

Synchronous Transmission mode can be used to clock

the code word out using an external clock.

To enter Synchronous Transmission mode, the Pro-

gramming mode start-up sequence must be executed

as shown in Figure 4-3. If either S1 or S0 is set on the

falling edge of S2 (or S3), the device enters Synchro-

nous Transmission mode. In this mode, it functions as

a normal transmitter, with the exception that the timing

of the PWM data string is controlled externally and 16

extra bits are transmitted at the end with the code word.

FIGURE 4-3:

SYNCHRONOUS TRANSMISSION MODE (TXEN=0)

TPS

TPH2

TPH1

t = 50ms

Preamble

Header

Data

PWM

S2

S[1:0]

“01,10,11”

FIGURE 4-4:

CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)

Fixed Portion

Encrypted Portion

Reserved

(16 bits)

Padding

(2 bits)

Button

Status

Serial Number

(28 bits)

Button

Status

DISC

(12 bits)

Sync Counter

(16 bits)

S2 S1 S0 S3

82 Data bits

Transmitted

LSb first.

LSb

MSb

DS41098C-page 10

2001 Microchip Technology Inc.

HCS201

TABLE 5-1:

PIN ACTIVATION TABLE

5.0

5.1

SPECIAL FEATURES

Code Word Completion

Function S2

S1

0

1

-

S0

0

1

0

-

Standby

0

1

2

-

0

-

The code word completion feature ensures that entire

code words are transmitted, even if the button is

released before the code word is complete. If the but-

ton is held down beyond the time for one code word,

multiple code words will result. If another button is acti-

vated during a transmission, the active transmission

will be aborted and a new transmission will begin using

the new button information.

Hopping Code

Seed Code

5

6

7

1

0

1

0

1

5.2

VLOW: Voltage LOW Indicator

The VLOW bit is transmitted with every transmission

(Figure 8-4) and will be transmitted as a one if the

operating voltage has dropped below the low voltage trip

point. The trip point is selectable based on the battery

voltage being used. See Section 3.7.2 for a description

of how the low voltage select option is set. This VLOW

signal is transmitted so the receiver can give an audible

signal to the user that the transmitter battery is low.

5.5

Blank Alternate Code Word

Federal Communications Commission (FCC) part 15

rules specify the limits on worst case average funda-

mental power and harmonics that can be transmitted in

a 100 ms window. For FCC approval purposes, it may

therefore be advantageous to minimize the transmis-

sion duty cycle. This can be achieved by minimizing the

duty cycle of the individual bits as well as by blanking

out consecutive code words. Blank Alternate Code

Word (BACW) may be used to reduce the average

power of a transmission by transmitting only every sec-

ond code word (Figure 5-1). This is a selectable feature

that is determined in conjunction with the baud rate

selection bit BSL0.

5.3

Auto-Shutoff

The auto-shutoff function automatically stops the device

from transmitting if a button inadvertently gets pressed

for a long period of time. This will prevent the device from

draining the battery if a button gets pressed while the

transmitter is in a pocket or purse. Time-out period is TTO.

5.4

Seed Transmission

Enabling the BACW option may likewise allow the user

to transmit a higher amplitude transmission as the time

averaged power is reduced. BACW effectively halves

the RF on time for a given transmission so the RF out-

put power could theoretically be doubled while main-

taining the same time averaged output power.

In order to increase the level of security in a system, it

is possible for the receiver to implement what is known

as a secure learn function. This can be done by utilizing

the seed value stored in EEPROM, transmitted only

when all three button inputs are pressed at the same

time (Table 5-1). Instead of the normal key generation

inputs being used to create the crypt key, this seed

value is used.

FIGURE 5-1:

BLANK ALTERNATE CODE WORD (BACW)

Amplitude

A

BRS = 0

BRS = 1

Code Word

2A

Time

2001 Microchip Technology Inc.

DS41098C-page 11

HCS201

FIGURE 5-2:

APPLICATION CIRCUIT

5.6

Step Up Regulator

The integrated Step Up regulator can be used to

ensure the power supply voltage to the encoder and

the RF circuit (VDD), is constant independent of what

the battery voltage is (VDDB). Input on VDD pin is com-

pared to VSTEP, the internal reference voltage. If VDD

falls below this voltage the STEP output is pulsed at

fSTEP. This output can be connected to an external cir-

cuit as illustrated in Figure 5-2, to provide a step up

voltage on the device.

VDD

L

D

S0

VDD

R

STEP

S1

S2

Q

C

Tx out

DATA

VSS

The Step Up regulator is inactive when the device is not

transmitting.

VDDB

2.0-6.0V

Three button remote control with Step up regulator

External components sample values:

Note: Power to the Step up regulator is taken

from the VDDB pin. While VDD is limited to

a 3.5V minimum, VDDB minimum can be as

low as 2.0V for the Step Up circuit to start

operating.

R = 5.1 KΩ

L = 390 uH

Q = 2N3904

C = 1.0 uF

D = ZHCS400CT (40V 0.4A Zetex)

FIGURE 5-3:

TYPICAL LOADING CURVES (FIGURE 5-2 CIRCUIT)

8

7

6

5

4

3

2

1

0

Vddb=2V

Vddb=2.5V

Vddb=3V

Vddb=3.5V

0

5

10

15

20

Load(mA)

Note: These are typical values not tested in production.

TABLE 5-2:

Symbol

STEP UP CIRCUIT CHARACTERISTICS

Parameters

Output frequency

VSTEP Reference voltage

Min.

Typ.

Max.

Units

Conditions

fSTEP

125

5.5

200

6.5

250

7.5

kHz

V

VDDB = 3V

Note: These parameters are characterized but not tested.

DS41098C-page 12

2001 Microchip Technology Inc.

HCS201

Twc. After every 16-bit word is written to the HCS201,

the HCS201 will signal that the write is complete by

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

low (if the oscillator was perfectly tuned) on DATA.

These will continue until S2 is dropped. The first pulse’s

width should NOT be used for calibration. At the end of

the programming cycle, the device can be verified

(Figure 6-2) by reading back the EEPROM. Reading is

done by clocking the S2 line and reading the data bits

on DATA. For security reasons, it is not possible to exe-

cute a verify function without first programming the

EEPROM. A Verify operation can only be done

once, immediately following the Program cycle.

6.0

PROGRAMMING THE HCS201

When using the HCS201 in a system, the user will have

to program some parameters into the device including

the serial number and the secret key before it can be

used. The programming cycle allows the user to input

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

stored internally in EEPROM. Programming will be

initiated by forcing the DATA line high, after the S2 line

has been held high for the appropriate length of time

line (Table 6-1 and Figure 6-1). After the Program

mode is entered, a delay must be provided to the

device for the automatic bulk write cycle to complete.

This will write all locations in the EEPROM to an all

zeros pattern. The device can then be programmed by

clocking 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

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

taken when driving PNP RF transistors.

FIGURE 6-1:

PROGRAMMING WAVEFORMS

Initiate Data

Polling Here

Enter Program

Mode

TCLKH

TPBW

T

CLKL

TDS

S2

(Clock)

TPS

TPH1

TWC

TDH

TCLKL

DATA

(Data)

Ack

Bit 0

Bit 1

Bit 2

Bit 3

Bit 14 Bit 15

Bit 16 Bit 17

Ack

Calibration Pulses

Data for Word 1

TPH2

Write Cycle

Complete Here

Repeat for each word (12 times)

Note 1: S0 and S1 button inputs to be held to ground during the entire programming sequence.

FIGURE 6-2: VERIFY WAVEFORMS

End of Programming Cycle Beginning of Verify Cycle

Data from Word 0

DATA

(Data)

Bit190 Bit191

Bit 0 Bit 1 Bit 2 Bit 3

Bit 14

Bit 15

Bit 16 Bit 17

Bit190 Bit191

Ack

TWC

TDV

S2

(Clock)

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

2001 Microchip Technology Inc.

DS41098C-page 13

HCS201

TABLE 6-1:

PROGRAMMING/VERIFY TIMING REQUIREMENTS

VDD = 5.0V ± 10%, 25° C ± 5 °C

Parameter

Symbol

Min.

Max.

Units

Program mode setup time

Hold time 1

TPS

TPH1

TPH2

TPBW

TPROG

TWC

2

5.0

—

30

—

ms

µs

ms

µs

4.0

50

Hold time 2

Bulk Write time

4.0

50

Program delay time

Program cycle time

Clock low time

TCLKL

TCLKH

TDS

50

Clock high time

Data setup time

Data hold time

50

0

TDH

18

Data out valid time

Hold time

TDV

—

TPHOLD

TACKL

TACKH

100

800

Acknowledge low time

Acknowledge high time

DS41098C-page 14

2001 Microchip Technology Inc.

HCS201

FIGURE 7-1:

TYPICAL LEARN

SEQUENCE

7.0

INTEGRATING THE HCS201

INTO A SYSTEM

Enter Learn

Use of the HCS201 in a system requires a compatible

decoder. This decoder is typically a microcontroller with

compatible firmware. Microchip will provide (via a

license agreement) firmware routines that accept

transmissions from the HCS201 and decrypt the

hopping code portion of the data stream. These

routines provide system designers the means to

develop their own decoding system.

Mode

Wait for Reception

of a Valid Code

Generate Key

from Serial Number

Use Generated Key

to Decrypt

7.1

Learning a Transmitter to a

Receiver

Compare Discrimination

Value with Fixed Value

A transmitter must first be ’learned’ by a decoder before

its use is allowed in the system. Several learning strat-

egies are possible, Figure 7-1 details a typical learn

sequence. Core to each, the decoder must minimally

store each learned transmitter’s serial number and cur-

rent synchronization counter value in EEPROM. Addi-

tionally, the decoder typically stores each transmitter’s

unique crypt key. The maximum number of learned

transmitters will therefore be relative to the available

EEPROM.

No

Equal

?

Yes

Wait for Reception

of Second Valid Code

Use Generated Key

to Decrypt

A transmitter’s serial number is transmitted in the clear

but the synchronization counter only exists in the code

word’s encrypted portion. The decoder obtains the

counter value by decrypting using the same key used

to encrypt the information. The KEELOQ algorithm is a

symmetrical block cipher so the encryption and decryp-

tion keys are identical and referred to generally as the

crypt key. The encoder receives its crypt key during

manufacturing. The decoder is programmed with the

ability to generate a crypt key as well as all but one

required input to the key generation routine; typically

the transmitter’s serial number.

Compare Discrimination

Value with Fixed Value

No

Equal

?

Yes

No

Counters

Sequential

?

Figure 7-1 summarizes a typical learn sequence. The

decoder receives and authenticates a first transmis-

sion; first button press. Authentication involves gener-

ating the appropriate crypt key, decrypting, validating

the correct key usage via the discrimination bits and

buffering the counter value. A second transmission is

received and authenticated. A final check verifies the

counter values were sequential; consecutive button

presses. If the learn sequence is successfully com-

plete, the decoder stores the learned transmitter’s

serial number, current synchronization counter value

and appropriate crypt key. From now on the crypt key

will be retrieved from EEPROM during normal opera-

tion instead of recalculating it for each transmission

received.

Yes

Learn

Unsuccessful

Learn successful Store:

Serial number

Encryption key

Synchronization counter

Exit

Certain learning strategies have been patented and

care must be taken not to infringe.

2001 Microchip Technology Inc.

DS41098C-page 15

HCS201

7.2

Decoder Operation

7.3

Synchronization with Decoder

(Evaluating the Counter)

Figure 7-2 summarizes normal decoder operation. The

decoder waits until a transmission is received. The

received serial number is compared to the EEPROM

table of learned transmitters to first determine if this

transmitter’s use is allowed in the system. If from a

learned transmitter, the transmission is decrypted

using the stored crypt key and authenticated via the

discrimination bits for appropriate crypt key usage. If

the decryption was valid the synchronization value is

evaluated.

The KEELOQ technology patent scope includes a

sophisticated synchronization technique that does not

require the calculation and storage of future codes. The

technique securely blocks invalid transmissions while

providing transparent resynchronization to transmitters

inadvertently activated away from the receiver.

Figure 7-3 shows a 3-partition, rotating synchronization

window. The size of each window is optional but the

technique is fundamental. Each time a transmission is

authenticated, the intended function is executed and

the transmission’s synchronization counter value is

stored in EEPROM. From the currently stored counter

value there is an initial "Single Operation" forward win-

dow of 16 codes. If the difference between a received

synchronization counter and the last stored counter is

within 16, the intended function will be executed on the

single button press and the new synchronization

counter will be stored. Storing the new synchronization

counter value effectively rotates the entire synchroniza-

tion window.

FIGURE 7-2:

TYPICAL DECODER

OPERATION

Start

No

Transmission

Received

?

Yes

A "Double Operation" (resynchronization) window fur-

ther exists from the Single Operation window up to 32K

codes forward of the currently stored counter value. It

is referred to as "Double Operation" because a trans-

mission with synchronization counter value in this win-

dow will require an additional, sequential counter

transmission prior to executing the intended function.

Upon receiving the sequential transmission the

decoder executes the intended function and stores the

synchronization counter value. This resynchronization

occurs transparently to the user as it is human nature

to press the button a second time if the first was unsuc-

cessful.

Does

Serial Number

Match

No

?

Yes

Decrypt Transmission

Is

No

Decryption

Valid

?

Yes

The third window is a "Blocked Window" ranging from

the double operation window to the currently stored

synchronization counter value. Any transmission with

synchronization counter value within this window will

be ignored. This window excludes previously used,

perhaps code-grabbed transmissions from accessing

the system.

Execute

Command

and

Update

Counter

Is

Counter

Within 16

?

Yes

No

Is

Counter

Within 32K

?

Note: The synchronization method described in

this section is only a typical implementation

and because it is usually implemented in

firmware, it can be altered to fit the needs

of a particular system.

Yes

Save Counter

in Temp Location

DS41098C-page 16

2001 Microchip Technology Inc.

HCS201

FIGURE 7-3:

SYNCHRONIZATION WINDOW

Entire Window

rotates to eliminate

use of previously

used codes

Blocked

Window

(32K Codes)

Stored

Synchronization

Counter Value

Double Operation

(resynchronization)

Window

Single Operation

Window

(16 Codes)

(32K Codes)

2001 Microchip Technology Inc.

DS41098C-page 17

HCS201

8.0

ELECTRICAL CHARACTERISTICS

TABLE 8-1:

ABSOLUTE MAXIMUM RATINGS

Item

Symbol

Rating

Units

VDD

VIN

Supply voltage

Input voltage

-0.3 to 13.5

-0.3 to VDD + 0.3

50

V

VOUT

IOUT

TSTG

TLSOL

Output voltage

Max output current

Storage temperature

Lead soldering temp

mA

-55 to +125

300

C (Note 1)

Note 1: Stresses above those listed under “ABSOLUTE MAXIMUM RATINGS” may cause permanent damage to

the device.

TABLE 8-2:

DC CHARACTERISTICS

Commercial (C): Tamb = 0°C to +70°C

Industrial

(I): Tamb = -40°C to +85°C

3.5V < VDD < 5.0V

Min. Max.

Typ.¹

5.0V < VDD < 13.0V

Parameter

Sym.

Min.

Typ.¹

Max.

Unit

Conditions

Operating

ICC

—

0.2

0.1

40

—

0.5

—

1.5

—

2

mA

Current (avg)²

Standby

Current

ICCS

VIH

—

1.0

—

0.1

160

—

1.0

µA

V

Auto-shutoff

Current^3,4

—

75

—

300

High Level

Input Voltage

0.55VDD

-0.3

VDD+0.3

0.15VDD

—

2.75

-0.3

VDD+0.3

0.75

Low level

Input Voltage

VIL

—

V

High level

Output

VOH

0.6VDD

—

3.3

—

V

IOH = -1.0 mA VDD = 3.5V

IOH = -2.0 mA VDD = 12V

Voltage

Low Level

Output

Voltage

VOL

—

40

80

—

60

0.08VDD

80

—

40

80

—

60

—

0.4

V

IOL = 1.0 mA VDD = 5V

IOL = 2.0 mA VDD = 12V

Pull-down

Resistance;

S0-S2

RSO-2

RDATA

80

kΩ VDD = 4.0V

Pull-down

Resistance;

DATA

120

160

120

160

Note 1: Typical values are at 25°C.

2: No load.

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

4: These values are characterized but not tested.

DS41098C-page 18

2001 Microchip Technology Inc.

HCS201

FIGURE 8-1:

POWER-UP AND TRANSMIT TIMING

Button Press

Detect

Multiple Code Word Transmission

TBP

TTD

TDB

DATA

Output

Code

Word

1

Code

Word

3

Code

Word

4

Code

Word

n

Code

Word

2

TS

TTO

Button

Input

Sn

TABLE 8-3:

POWER-UP AND TRANSMIT TIMING⁽²⁾

Standard Operating Conditions (unless otherwise specified):

Commercial(C): Tamb = 0°C to +70°C

Industrial(I): Tamb = -40°C to +85°C

Symbol

Parameter

Min.

Typ.

Max.

Unit

Conditions

(Note 1)

TBP

Time to second button press

10 + Code

Word

26 + Code

Word

ms

TTD

TDB

TTO

Ts

Transmit delay from button detect

Debounce Delay

12

6

26

20

ms

s

Auto-shutoff time-out period

START Pulse Delay

27

4.5

ms

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

(the intention was to press the combination of buttons).

2: Typical values - not tested in production.

FIGURE 8-2:

CODE WORD FORMAT

TE TE

TE

LOGIC ‘0’

LOGIC ‘1’

Bit Period

TBP

50% Duty Cycle

Preamble

TP

Encrypted Portion

of Transmission

Fixed Portion of

Transmission

TFIX

Guard

Time

TG

Header

TH

THOP

2001 Microchip Technology Inc.

DS41098C-page 19

HCS201

FIGURE 8-3:

CODE WORD FORMAT: PREAMBLE/HEADER PORTION

P1

P12

Bit 0 Bit 1

Data Bits

23 TE 50% Duty Cycle Preamble

10 TE Header

FIGURE 8-4:

CODE WORD FORMAT: DATA PORTION (XSER=0)

Serial Number Button Code

S0 S1

Status

LSB

Bit 0 Bit 1

Encrypted Portion

MSB LSB

MSB S3

S2 VLOW RPT

Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Bit 60

Bit 62 Bit 63 Bit 64 Bit 65

Bit 61

Fixed Portion

Guard

Time

Header

TABLE 8-4:

CODE WORD TRANSMISSION TIMING REQUIREMENTS

VDD = +3.5 to 6.0V

Commercial (C): Tamb = 0°C to +70°C

Code Words Transmitted

1 out of 2

All

Industrial

(I): Tamb = -40°C to +85°C

Number

of TE

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

TE

TBP

TP

Basic pulse element

PWM bit pulse width

Preamble duration

Header duration

1

3

360

1.08

8.64

3.6

400

1.2

440

1.32

180

0.54

4.32

1.8

200

0.6

220

0.66

5.28

2.2

µs

ms

bps

23

10

96

102

39

271

9.2

10.56

4.4

4.6

TH

4.0

2.0

THOP

TFIX

TG

Hopping code duration

Fixed code duration

Guard Time

34.56

36.72

14.04

38.4

40.8

15.6

42.24

44.88

17.16

17.28

18.36

7.02

19.2

20.4

7.8

21.12

22.44

8.58

59.62

1515

Total Transmit Time

PWM data rate

97.56 108.4 119.24 48.78

925 833 757 1851

54.2

1667

Note 1: The timing parameters are not tested but derived from the oscillator clock.

DS41098C-page 20

2001 Microchip Technology Inc.

HCS201

9.0

9.1

PACKAGING INFORMATION

Package Marking Information

8-Lead PDIP (300 mil)

Example

HCS201

XXXXXXXX

XXXXXNNN

YYWW

0025

8-Lead SOIC (150 mil)

Example

XXXXXXX

XXXYYWW

HCS201

XXX0025

NNN

Legend: XX...X Customer specific information*

YY

Year code (last 2 digits of calendar year)

WW

NNN

Week code (week of January 1 is week ‘01’)

Alphanumeric traceability code

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line thus limiting the number of available characters

for customer specific information.

*

Standard OTP marking consists of Microchip part number, year code, week code, facility code, mask

rev#, and assembly code. For OTP marking beyond this, certain price adders apply. Please check with

your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP price.

2001 Microchip Technology Inc.

DS41098C-page 21

HCS201

9.2

Package Details

8-Lead Plastic Dual In-line (P) – 300 mil (PDIP)

E1

D

2

n

1

α

E

A2

A

L

c

A1

β

B1

B

p

eB

Units

INCHES*

NOM

MILLIMETERS

Dimension Limits

MIN

MAX

MIN

NOM

8

MAX

n

p

Number of Pins

Pitch

8

.100

.155

.130

2.54

Top to Seating Plane

A

.140

.170

3.56

2.92

3.94

3.30

4.32

Molded Package Thickness

Base to Seating Plane

Shoulder to Shoulder Width

Molded Package Width

Overall Length

A2

A1

E

.115

.015

.300

.240

.360

.125

.008

.045

.014

.310

5

.145

3.68

0.38

7.62

6.10

9.14

3.18

0.20

1.14

0.36

7.87

5

.313

.250

.373

.130

.012

.058

.018

.370

10

.325

.260

.385

.135

.015

.070

.022

.430

15

7.94

6.35

9.46

3.30

0.29

1.46

0.46

9.40

10

8.26

6.60

9.78

3.43

0.38

1.78

0.56

10.92

15

E1

D

Tip to Seating Plane

Lead Thickness

L

c

Upper Lead Width

B1

B

Lower Lead Width

Overall Row Spacing

Mold Draft Angle Top

Mold Draft Angle Bottom

§

eB

α

β

5

10

15

5

10

15

* Controlling Parameter

§ Significant Characteristic

Notes:

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

.010” (0.254mm) per side.

JEDEC Equivalent: MS-001

Drawing No. C04-018

DS41098C-page 22

2001 Microchip Technology Inc.

HCS201

8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC)

E

E1

p

D

2

B

n

1

h

α

45°

c

A2

A

φ

β

L

A1

Units

INCHES*

NOM

MILLIMETERS

Dimension Limits

MIN

MAX

MIN

NOM

8

MAX

n

p

Number of Pins

Pitch

8

.050

.061

.056

.007

.237

.154

.193

.015

.025

4

1.27

Overall Height

A

.053

.069

1.35

1.32

1.55

1.42

0.18

6.02

3.91

4.90

0.38

0.62

4

1.75

1.55

0.25

6.20

3.99

5.00

0.51

0.76

8

Molded Package Thickness

Standoff

A2

A1

E

.052

.004

.228

.146

.189

.010

.019

0

.061

.010

.244

.157

.197

.020

.030

8

§

0.10

5.79

3.71

4.80

0.25

0.48

0

Overall Width

Molded Package Width

Overall Length

E1

D

Chamfer Distance

Foot Length

h

L

φ

Foot Angle

c

Lead Thickness

Lead Width

.008

.013

0

.009

.017

12

.010

.020

15

0.20

0.33

0

0.23

0.42

12

0.25

0.51

15

B

α

Mold Draft Angle Top

Mold Draft Angle Bottom

β

0

12

15

0

12

15

* Controlling Parameter

§ Significant Characteristic

Notes:

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

.010” (0.254mm) per side.

JEDEC Equivalent: MS-012

Drawing No. C04-057

2001 Microchip Technology Inc.

DS41098C-page 23

HCS201

Systems Information and Upgrade Hot

Line

ON-LINE SUPPORT

Microchip provides on-line support on the Microchip

World Wide Web (WWW) site.

The Systems Information and Upgrade Line provides

system users a listing of the latest versions of all of

Microchip's development systems software products.

Plus, this line provides information on how customers

can receive any currently available upgrade kits.The

Hot Line Numbers are:

The web site is used by Microchip as a means to make

files and information easily available to customers. To

view the site, the user must have access to the Internet

and a web browser, such as Netscape or Microsoft

Explorer. Files are also available for FTP download

from our FTP site.

1-800-755-2345 for U.S. and most of Canada, and

1-480-792-7302 for the rest of the world.

Connecting to the Microchip Internet Web

Site

The Microchip web site is available by using your

favorite Internet browser to attach to:

www.microchip.com

The file transfer site is available by using an FTP ser-

vice to connect to:

ftp://ftp.microchip.com

The web site and file transfer site provide a variety of

services. Users may download files for the latest

Development Tools, Data Sheets, Application Notes,

User’s Guides, Articles and Sample Programs. A vari-

ety of Microchip specific business information is also

available, including listings of Microchip sales offices,

distributors and factory representatives. Other data

available for consideration is:

• Latest Microchip Press Releases

• Technical Support Section with Frequently Asked

Questions

• Design Tips

• Device Errata

• Job Postings

• Microchip Consultant Program Member Listing

• Links to other useful web sites related to

Microchip Products

• Conferences for products, Development Systems,

technical information and more

• Listing of seminars and events

DS41098C-page 24

2001 Microchip Technology Inc.

HCS201

READER RESPONSE

It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-

uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation

can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-7578.

Please list the following information, and use this outline to provide us with your comments about this Data Sheet.

To:

Technical Publications Manager

Reader Response

Total Pages Sent

RE:

From:

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Company

Address

City / State / ZIP / Country

Telephone: (_______) _________ - _________

FAX: (______) _________ - _________

Application (optional):

Would you like a reply?

Y

N

Literature Number:

DS41098C

Device:

HCS201

Questions:

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this data sheet easy to follow? If not, why?

4. What additions to the data sheet do you think would enhance the structure and subject?

5. What deletions from the data sheet could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?

8. How would you improve our software, systems, and silicon products?

2001 Microchip Technology Inc.

DS41098C-page 25

HCS201

NOTES:

DS41098C-page 26

2001 Microchip Technology Inc.

Microchip’s Secure Data Products are covered by some or all of the following patents:

Code hopping encoder patents issued in Europe, U.S.A., and R.S.A. — U.S.A.: 5,517,187; Europe: 0459781; R.S.A.: ZA93/4726

Secure learning patents issued in the U.S.A. and R.S.A. — U.S.A.: 5,686,904; R.S.A.: 95/5429

Information contained in this publication regarding device

applications and the like is intended through suggestion only

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

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microchip Technology Incorporated with respect

to the accuracy or use of such information, or infringement of

patents or other intellectual property rights arising from such

use or otherwise. Use of Microchip’s products as critical com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,

KEELOQ, MPLAB, PIC, PICmicro, PICMASTER, PICSTART,

PRO MATE, SEEVAL and The Embedded Control Solutions

Company are registered trademarks of Microchip Technology

Incorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, microID,

microPort, Migratable Memory, MPASM, MPLIB, MPLINK,

MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select

Mode and Total Endurance are trademarks of Microchip

Technology Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999. The

Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro^®8-bit MCUs, KEELOQ^®code hopping

devices, Serial EEPROMs and microperipheral

products. In addition, Microchip’s quality

system for the design and manufacture of

development systems is ISO 9001 certified.

2001 Microchip Technology Inc.

DS41098C - page 27

WORLDWIDE SALES AND SERVICE

Japan

AMERICAS

ASIA/PACIFIC

Microchip Technology Japan K.K.

Benex S-1 6F

3-18-20, Shinyokohama

Kohoku-Ku, Yokohama-shi

Kanagawa, 222-0033, Japan

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

Corporate Office

Australia

2355 West Chandler Blvd.

Microchip Technology Australia Pty Ltd

Suite 22, 41 Rawson Street

Epping 2121, NSW

Chandler, AZ 85224-6199

Tel: 480-792-7200 Fax: 480-792-7277

Technical Support: 480-792-7627

Web Address: http://www.microchip.com

Australia

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

Korea

Rocky Mountain

China - Beijing

Microchip Technology Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Korea 135-882

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7966 Fax: 480-792-7456

Microchip Technology Consulting (Shanghai)

Co., Ltd., Beijing Liaison Office

Unit 915

Bei Hai Wan Tai Bldg.

Atlanta

500 Sugar Mill Road, Suite 200B

Atlanta, GA 30350

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

No. 6 Chaoyangmen Beidajie

Beijing, 100027, No. China

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

Singapore

Microchip Technology Singapore Pte Ltd.

200 Middle Road

#07-02 Prime Centre

Singapore, 188980

Tel: 65-334-8870 Fax: 65-334-8850

Taiwan

Microchip Technology Taiwan

11F-3, No. 207

Tung Hua North Road

Taipei, 105, Taiwan

Tel: 770-640-0034 Fax: 770-640-0307

China - Chengdu

Boston

Microchip Technology Consulting (Shanghai)

Co., Ltd., Chengdu Liaison Office

Rm. 2401, 24th Floor,

Ming Xing Financial Tower

No. 88 TIDU Street

Chengdu 610016, China

Tel: 86-28-6766200 Fax: 86-28-6766599

China - Fuzhou

Microchip Technology Consulting (Shanghai)

Co., Ltd., Fuzhou Liaison Office

Rm. 531, North Building

Fujian Foreign Trade Center Hotel

73 Wusi Road

2 Lan Drive, Suite 120

Westford, MA 01886

Tel: 978-692-3848 Fax: 978-692-3821

Chicago

333 Pierce Road, Suite 180

Itasca, IL 60143

Tel: 630-285-0071 Fax: 630-285-0075

Dallas

4570 Westgrove Drive, Suite 160

Addison, TX 75001

Tel: 972-818-7423 Fax: 972-818-2924

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

EUROPE

Denmark

Dayton

Two Prestige Place, Suite 130

Miamisburg, OH 45342

Tel: 937-291-1654 Fax: 937-291-9175

Microchip Technology Nordic ApS

Regus Business Centre

Lautrup hoj 1-3

Ballerup DK-2750 Denmark

Tel: 45 4420 9895 Fax: 45 4420 9910

Fuzhou 350001, China

Tel: 86-591-7557563 Fax: 86-591-7557572

China - Shanghai

Microchip Technology Consulting (Shanghai)

Co., Ltd.

Room 701, Bldg. B

Far East International Plaza

No. 317 Xian Xia Road

Detroit

Tri-Atria Office Building

32255 Northwestern Highway, Suite 190

Farmington Hills, MI 48334

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

France

Microchip Technology SARL

Parc d’Activite du Moulin de Massy

43 Rue du Saule Trapu

Shanghai, 200051

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

Kokomo

Batiment A - ler Etage

91300 Massy, France

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

2767 S. Albright Road

Kokomo, Indiana 46902

Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

China - Shenzhen

Microchip Technology Consulting (Shanghai)

Co., Ltd., Shenzhen Liaison Office

Rm. 1315, 13/F, Shenzhen Kerry Centre,

Renminnan Lu

Shenzhen 518001, China

Tel: 86-755-2350361 Fax: 86-755-2366086

Germany

Microchip Technology GmbH

Gustav-Heinemann Ring 125

D-81739 Munich, Germany

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

18201 Von Karman, Suite 1090

Irvine, CA 92612

Tel: 949-263-1888 Fax: 949-263-1338

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

Italy

Hong Kong

Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Microchip Technology Hongkong Ltd.

Unit 901-6, Tower 2, Metroplaza

223 Hing Fong Road

Kwai Fong, N.T., Hong Kong

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

Milan, Italy

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

India

United Kingdom

Arizona Microchip Technology Ltd.

505 Eskdale Road

Winnersh Triangle

Wokingham

Microchip Technology Inc.

India Liaison Office

Divyasree Chambers

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

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

1 Floor, Wing A (A3/A4)

No. 11, O’Shaugnessey Road

Bangalore, 560 025, India

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

Berkshire, England RG41 5TU

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

10/01/01

DS41098C-page 28

2001 Microchip Technology Inc.


型号：	HCS201T-I/SN
厂家：	ETC
描述：	REMOTE-CONTROL TRANSMITTER/ENCODER\|CMOS\|SOP\|8PIN 遥控发射器/编码器\| CMOS \|专科\| 8PIN\n 遥控编码器
文件：	总28页 (文件大小：369K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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