HCS300-I/P_技术文档

HCS300

®

KEELOQ Code Hopping Encoder

FEATURES

Security

DESCRIPTION

The HCS300 from Microchip Technology Inc. is a code

hopping encoder designed for secure Remote Keyless

Entry (RKE) systems. The HCS300 utilizes the KEELOQ

code hopping technology, incorporating high security, a

small package outline and low cost. The HCS300 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

• 28-bit serial number, 4-bit button code, 2-bit status

• Crypt keys are read protected

PACKAGE TYPES

PDIP, SOIC

Operating

8

7

6

5

VDD

S0

S1

1

2

3

4

• 2.0V - 6.3V operation

LED

PWM

VSS

• Four button inputs

• No additional circuitry required

• 15 functions available

S2

S3

• Selectable baud rate

• Automatic code word completion

• Low battery signal transmitted to receiver

• Non-volatile synchronization data

HCS300 BLOCK DIAGRAM

Oscillator

Power

latching

and

Other

Controller

RESET circuit

switching

• Easy-to-use programming interface

• On-chip EEPROM

LED

LED driver

• On-chip oscillator and timing components

• Button inputs have internal pull-down resistors

• Current limiting on LED output

• Low external component cost

EEPROM

Encoder

PWM

32-bit shift register

Button input port

Typical Applications

The HCS300 is ideal for Remote Keyless Entry (RKE)

applications. These applications include:

VSS

VDD

• Automotive RKE systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage door openers

• Identity tokens

S3 S2 S1 S0

The HCS300 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.

DS21137F-page 1

HCS300

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 HCS300 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 HCS300 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 HCS300 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 HCS300 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 HCS300 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

DS21137F-page 2

2001 Microchip Technology Inc.

HCS300

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 1-1). 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

HCS300 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

HCS300

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 HCS300 based transmitter. Section 7.0

provides detail on integrating the HCS300 into a sys-

tem.

2001 Microchip Technology Inc.

DS21137F-page 3

HCS300

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.

DS21137F-page 4

2001 Microchip Technology Inc.

HCS300

The HCS300 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.

2.0

ENCODER OPERATION

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

the HCS300 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.

FIGURE 2-1:

TYPICAL CIRCUITS

VDD

B0

B1

S0

VDD

LED

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.

S1

S2

S3

Tx out

PWM

Vss

2 button remote control

VDD

B4 B3 B2 B1 B0

FIGURE 2-2:

ENCODER OPERATION

Power-Up

(A button has been pressed)

S0

VDD

LED

PWM

Vss

RESET and Debounce Delay

(10 ms)

S1

S2

S3

Tx out

Sample Inputs

Update Sync Info

5 button remote control (Note)

Encrypt With

Crypt Key

Note: Up to 15 functions can be implemented

by pressing more than one button

simultaneously or by using a suitable

diode array.

Load Transmit Register

Transmit

TABLE 2-1:

PIN DESCRIPTIONS

Description

Name

Buttons

Added

?

Yes

Number

S0

S1

S2

1

2

3

Switch input 0

Switch input 1

No

All

Buttons

Released

?

Switch input 2 / Clock pin when in

Programming mode

S3

V^SS

4

5

6

Switch input 3

Yes

Ground reference

Complete Code

Word Transmission

PWM

Pulse Width Modulation (PWM)

output pin / Data pin for

Programming mode

Stop

LED

VDD

7

8

Cathode connection for LED

Positive supply voltage

2001 Microchip Technology Inc.

DS21137F-page 5

HCS300

3.2

SYNC (Synchronization Counter)

3.0

EEPROM MEMORY

ORGANIZATION

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

create the hopping code for transmission. This value

will increment after every transmission.

The HCS300 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,

synchronization value, etc. Further descriptions of the

memory array is given in the following sections.

3.3

Reserved

Must be initialized to 0000H.

3.4

SER_0, SER_1

TABLE 3-1:

EEPROM MEMORY MAP

(Encoder Serial Number)

WORD

ADDRESS

MNEMONIC

DESCRIPTION

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.

0

1

2

3

4

KEY_0

64-bit encryption key

(word 0) LSb’s

KEY_1

KEY_2

KEY_3

SYNC

64-bit encryption key

(word 1)

3.5

SEED_0, SEED_1 (Seed Word)

64-bit encryption key

(word 2)

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.

64-bit encryption key

(word 3) MSb’s

16-bit synchronization

value

5

6

RESERVED Set to 0000H

3.5.1

AUTO-SHUTOFF TIMER ENABLE

SER_0

Device Serial Number

(word 0) LSb’s

The Most Significant bit of the serial number (Bit 31) is

used to turn the Auto-shutoff timer on or off. This timer

prevents the transmitter from draining the battery

should a button get stuck in the on position for a long

period of time. The time period is approximately

25 seconds, after which the device will go to the Time-

out mode. When in the Time-out mode, the device will

stop transmitting, although since some circuits within

the device are still active, the current draw within the

Shutoff mode will be higher than Standby mode. If the

Most Significant bit in the serial number is a one, then

the Auto-shutoff timer is enabled, and a zero in the

Most Significant bit will disable the timer. The length of

the timer is not selectable.

7

SER_1

(Note)

Device Serial Number

(word 1) MSb’s

8

9

SEED_0

SEED_1

Seed Value (word 0)

Seed Value (word 1)

10

11

RESERVED Set to 0000H

CONFIG Config Word

Note: The MSB of the serial number contains a bit

used to select the Auto-shutoff timer.

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.

DS21137F-page 6

2001 Microchip Technology Inc.

HCS300

of unique values. This can be done by programming

OVR0 and OVR1 to 1s at the time of production. The

encoder will automatically clear OVR0 the first time that

the synchronization value wraps from 0xFFFF to

0x0000 and clear OVR1 the second time the counter

wraps. Once cleared, OVR0 and OVR1 cannot be set

again, thereby creating a permanent record of the

counter overflow. This prevents fast cycling of 64K

counter. If the decoder system is programmed to track

the overflow bits, then the effective number of unique

synchronization values can be extended to 196,608.

3.6

CONFIG (Configuration Word)

The Configuration Word is a 16-bit word stored in

EEPROM array that is used by the device to store

information used during the encryption process, as well

as the status of option configurations. The following

sections further explain these bits.

TABLE 3-2:

Bit Number

CONFIGURATION 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

Overflow Bit 0 (OVR0)

Overflow Bit 1 (OVR1)

Low Voltage Trip Point Select (VLOW

SEL)

3.6.3

BAUD RATE SELECT BITS

(BSL0, BSL1)

BSL0 and BSL1 select the speed of transmission and

the code word blanking. Table 3-3 shows how the bits

are used to select the different baud rates and

Section 5.7 provides detailed explanation in code word

blanking.

TABLE 3-3:

BSL1 BSL0

BAUD RATE SELECT

9

10

11

12

Basic Pulse

Element

Code Words

Transmitted

0

1

0

1

0

1

400 µs

200 µs

100 µs

All

1 out of 2

1 out of 4

13

14

15

Baud rate Select Bit 0 (BSL0)

Baud rate Select Bit 1 (BSL1)

Reserved, set to 0

3.6.1

DISCRIMINATION VALUE

(DISC0 TO DISC9)

3.6.4

LOW VOLTAGE TRIP POINT

SELECT (VLOW SEL)

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

serial number then it may merely be compared to the

respective bits of the received serial number; saving

EEPROM space.

The low voltage trip point select bit is used to tell the

HCS300 what VDD level is being used. This information

will be used by the device to determine when to send

the voltage low signal to the receiver. When this bit is

set to a one, the VDD level is assumed to be operating

from a 5V or 6V VDD level. If the bit is set low, then the

VDD level is assumed to be 3.0 volts.

FIGURE 3-1:

VLOW CHARACTERISTICS

Volts (V)

4.2

VLOW

VLOW sel = 1

4.0

3.8

3.6

3.6.2

OVERFLOW BITS

(OVR0, OVR1)

2.6

2.4

VLOW sel = 0

2.2

2.0

1.8

1.6

1.4

The overflow bits are used to extend the number of

possible synchronization values. The synchronization

counter is 16 bits in length, yielding 65,536 values

before the cycle repeats. Under typical use of

10 operations a day, this will provide nearly 18 years of

use before a repeated value will be used. Should the

system designer conclude that is not adequate, then

the overflow bits can be utilized to extend the number

Temp (C)

-40

0

50

85

2001 Microchip Technology Inc.

DS21137F-page 7

HCS300

4.2

Code Word Organization

4.0

4.1

TRANSMITTED WORD

The HCS300 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).

Code Word Format

The HCS300 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

Repeat VLOW

(1 bit) (1 bit)

Button

Status

Serial Number

(28 bits)

Button

Status

OVR

(2 bits) (10 bits)

DISC

Sync Counter

(16 bits)

S2 S1 S0 S3

MSb

LSb

66 Data bits

Transmitted

LSb first.

Repeat VLOW

(1 bit) (1 bit)

Button

Status

1 1 1 1

Serial Number

(28 bits)

SEED

(32 bits)

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

DS21137F-page 8

2001 Microchip Technology Inc.

HCS300

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

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+ OVR

(12 bits)

Sync Counter

(16 bits)

S2 S1 S0 S3

82 Data bits

Transmitted

LSb first.

LSb

MSb

2001 Microchip Technology Inc.

DS21137F-page 9

HCS300

5.6

Seed Transmission

5.0

5.1

SPECIAL FEATURES

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 four 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.

Code Word Completion

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.

TABLE 5-1:

PIN ACTIVATION TABLE

Function S3 S2 S1

S0

0

1

0

-

5.2

LED Output Operation

Standby

0

1

0

-

0

-

0

1

-

During normal transmission the LED output is LOW. If

the supply voltage drops below the low voltage trip

point, the LED output will be toggled at approximately

5Hz during the transmission (Section 3.6.4).

2

Hopping Code

Seed Code

-

5.3

RPT: Repeat Indicator

13

14

15

1

0

1

0

1

This bit will be low for the first transmitted word. If a

button is held down for more than one transmitted code

word, this bit will be set to indicate a repeated code

word and remain set until the button is released.

5.4

VLOW: Voltage LOW Indicator

The VLOW signal is transmitted so the receiver can

give an indication to the user that the transmitter bat-

tery is low. The VLOW bit is included in every transmis-

sion (Figure 4-2 and Figure 8-4) and will be

transmitted as a zero if the operating voltage is above

the low voltage trip point. Refer to Figure 4-2. The trip

point is selectable based on the battery voltage being

used. See Section 3.6.3 for a description of how the

low voltage trip point is configured.

5.5

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.

This function can be enabled or disabled and is

selected by setting or clearing the Auto-shutoff bit (see

Section 3.5.1). Setting this bit high will enable the func-

tion (turn Auto-shutoff function on) and setting the bit

low will disable the function. Time-out period is approx-

imately 25 seconds.

DS21137F-page 10

2001 Microchip Technology Inc.

HCS300

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

that is determined in conjunction with the baud rate

selection bit BSL0.

5.7

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-

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.

FIGURE 5-1:

BLANK ALTERNATE CODE WORD (BACW)

Amplitude

BACW Disabled

(All words transmitted)

Code Word

A

BACW Enabled

(1 out of 2 transmitted)

2A

4A

BACW Enabled

(1 out of 4 transmitted)

Time

2001 Microchip Technology Inc.

DS21137F-page 11

HCS300

programming delay is required for the internal program

cycle to complete. This delay can take up to TWC. At the

end of the programming cycle, the device can be veri-

fied (Figure 6-2) by reading back the EEPROM. Read-

ing is done by clocking the S2 (or S3) line and reading

the data bits on PWM. For security reasons, it is not

possible to execute a verify function without first pro-

gramming the EEPROM. A Verify operation can only

be done once, immediately following the Program

cycle.

6.0

PROGRAMMING THE HCS300

When using the HCS300 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 PWM line high, after the S2 (or

S3) line has been held high for the appropriate length

of time line (Table 6-1 and Figure 6-1). After the Pro-

gram mode is entered, a delay must be provided to the

device for the automatic bulk write cycle to complete.

This will set all locations in the EEPROM to zeros. The

device can then be programmed by clocking in 16 bits

at a time, using S2 (or S3) as the clock line and PWM

as the data in line. After each 16-bit word is loaded, a

Note: To ensure that the device does not acci-

dentally enter Programming mode, PWM

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

Enter Program

Mode

TPBW

TCLKH

TDS

TWC

S2 (S3)

(Clock)

TPS

TPH1

TDH

Bit 3

TCLKL

Bit 0 Bit 1

PWM

(Data)

Bit 2

Bit 14 Bit 15

Bit 16 Bit 17

Data for Word 1

Data for Word 0 (KEY_0)

Repeat for each word (12 times)

TPH2

Note 1: Unused button inputs to be held to ground during the entire programming sequence.

2: The VDD pin must be taken to ground after a Program/Verify cycle.

FIGURE 6-2:

VERIFY WAVEFORMS

Beginning of Verify Cycle

Data from Word 0

End of Programming Cycle

PWM

(Data)

Bit190 Bit191

Bit 0

Bit 1 Bit 2 Bit 3

Bit 14

Bit 15

Bit 16 Bit 17

Bit190 Bit191

TWC

TDV

S2 (S3)

(Clock)

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

DS21137F-page 12

2001 Microchip Technology Inc.

HCS300

TABLE 6-1:

PROGRAMMING/VERIFY TIMING REQUIREMENTS

VDD = 5.0V ± 10%, 25 °C ± 5 °C

Parameter

Symbol

TPS

Min.

3.5

50

Max.

4.5

—

Units

ms

µs

Program mode setup time

Hold time 1

T^PH1

T^PH2

T^PBW

T^PROG

T^WC

Hold time 2

—

Bulk Write time

4.0

50

—

ms

µs

Program delay time

Program cycle time

Clock low time

—

TCLKL

T^CLKH

T^DS

50

—

Clock high time

50

—

µs

µs⁽¹⁾

Data setup time

0

—

Data hold time

T^DH

T^DV

30

—

Data out valid time

30

Note 1: Typical values - not tested in production.

2001 Microchip Technology Inc.

DS21137F-page 13

HCS300

FIGURE 7-1:

TYPICAL LEARN

SEQUENCE

7.0

INTEGRATING THE HCS300

INTO A SYSTEM

Enter Learn

Use of the HCS300 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 HCS300 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.

DS21137F-page 14

2001 Microchip Technology Inc.

HCS300

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

2001 Microchip Technology Inc.

DS21137F-page 15

HCS300

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)

DS21137F-page 16

2001 Microchip Technology Inc.

HCS300

8.0

ELECTRICAL CHARACTERISTICS

TABLE 8-1:

Symbol

ABSOLUTE MAXIMUM RATINGS

Item

Rating

-0.3 to 6.6

-0.3 to VDD + 0.3

50

Units

VDD

V^IN

Supply voltage

Input voltage

V

VOUT

I^OUT

Output voltage

Max output current

Storage temperature

Lead soldering temp

ESD rating

V

mA

T^STG

TLSOL

V^ESD

-55 to +125

300

°C (Note)

V

4000

Note: 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

2.0V < VDD < 3.0

3.0 < VDD < 6.3

Parameter

Sym.

Min.

Typ.¹

Max.

Min.

Typ.¹

Max.

Unit

Conditions

VDD = 3.0V

Operating cur-

rent (avg)²

ICC

0.2

1

1.0

2.5

mA

VDD = 6.3V

Standby current

ICCS

0.1

40

1.0

75

0.1

1.0

µA

Auto-shutoff

current^3,4

160

650

High level Input

voltage

VIH

0.55VDD

VDD+

0.3

0.55VDD

VDD+

0.3

V

Low level input

voltage

VIL

VOH

-0.3

0.15VDD

-0.3

0.15VDD

V

High leveloutput

voltage

IOH = -1.0 mA VDD = 2.0V

IOH = -2.0 mA VDD = 6.3V

0.6VDD

Low level out-

put voltage

IOL = 1.0 mA VDD = 2.0V

IOL = 2.0 mA VDD = 6.3V

VOL

0.08VDD

2.5

0.08VDD

3.7

V

6

LED sink

current⁵

VLED = 1.5V VDD = 3.0V

ILED

RS0-3

1.0

40

1.8

60

2.0

40

2.7

60

mA

kΩ

6

VLED = 1.5V VDD = 6.3V

Pull-down

Resistance;

S0-S3

VDD = 4.0V

80

Pull-down

Resistance;

PWM

RPWM

80

120

160

80

120

160

kΩ

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.

5: With VLOW Sel = 0 for operation from 2.0V to 3.0V and VLOW Sel = 1 for operation from 3.0V to 6.3V.

6: VLED is the voltage drop across the terminals of the LED.

2001 Microchip Technology Inc.

DS21137F-page 17

HCS300

FIGURE 8-1:

POWER-UP AND TRANSMIT TIMING

Button Press

Detect

Multiple Code Word Transmission

TBP

TTD

TDB

PWM

Output

Code

Word

1

Code

Word

3

Code

Word

4

Code

Word

n

Code

Word

2

TTO

Button

Input

Sn

TABLE 8-3:

POWER-UP AND TRANSMIT TIMING⁽²⁾

VDD = +3.5 to 13.0V

Commercial(C): Tamb = 0°C to +70°C

Industrial(I): Tamb = -40°C to +85°C

Symbol

Parameter

Min

Max

Unit

Remarks

(Note 1)

TBP

Time to second button press

10 + Code 26 + Code

ms

Word

TTD

TDB

TTO

Transmit delay from button detect

Debounce Delay

10

26

ms

s

6

15

Auto-shutoff time-out period

20

120

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: 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

DS21137F-page 18

2001 Microchip Technology Inc.

HCS300

FIGURE 8-3:

CODE WORD FORMAT: PREAMBLE/HEADER PORTION

P1

P12

Bit 0 Bit 1

23 TE 50% Duty Cycle Preamble

10 TE Header

Data Bits

FIGURE 8-4:

CODE WORD FORMAT: DATA PORTION

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 = +2.0 to 6.0V

Commercial(C):Tamb = 0 °C to +70 °C

Industrial(I):Tamb = -40 °C to +85 °C

Code Words Transmitted

1 out of 2

All

1 out of 4

Number

of TE

Symbol

Characteristic

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units

Basic pulse element

PWM bit pulse width

Preamble duration

Header duration

TE

TBP

TP

1

260

400

660

130

200

600

4.6

330

990

7.6

65

195

1.5

0.7

6.2

6.6

2.5

100

300

2.3

1.0

9.6

165

495

3.8

µs

3

780 1200 1980 390

23

10

96

102

39

270

—

6.0

2.6

9.2

4.0

15.2

6.6

3.0

1.3

ms

TH

2.0

3.3

1.7

Hopping code duration

Fixed code duration

Guard Time

THOP

TFIX

TG

25.0 38.4 63.4 12.5 19.2 31.7

26.5 40.8 67.3 13.3 20.4 33.7

15.8

10.2 16.8

3.9 6.4

10.1 15.6 25.7

5.1

7.8

12.9

Total Transmit Time

PWM data rate

—

70.2 108.0 178.2 35.1 54.0 89.1 17.6 27.0 44.6

1282 833

—

505 2564 1667 1010 5128 3333 2020 bps

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

2001 Microchip Technology Inc.

DS21137F-page 19

HCS300

FIGURE 8-5:

HCS300 TE VS. TEMP

Typical

1.7

LEGEND

= 2.0

= 3.0

= 6.0

1.6

1.5

TE Max.

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

TE Min.

0.6

-50 -40 -30 -20 -10

0

10 20 30 40 50 60 70 80 90

DS21137F-page 20

2001 Microchip Technology Inc.

HCS300

9.0

9.1

PACKAGING INFORMATION

Package Marking Information

8-Lead PDIP (300 mil)

Example

HCS300

XXXXXXXX

XXXXXNNN

YYWW

0025

8-Lead SOIC (150 mil)

Example

XXXXXXX

HC300

XXXYYWW

XXX0025

NNN

Legend: XX...X Customer specific information*

Y

Year code (last digit of calendar year)

YY

WW

NNN

Year code (last 2 digits of calendar year)

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 PICmicro device marking consists of Microchip part number, year code, week code, and

traceability code. For PICmicro device 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.

DS21137F-page 21

HCS300

9.2

Package Details

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

E1

D

2

1

n

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

DS21137F-page 22

2001 Microchip Technology Inc.

HCS300

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

β

Mold Draft Angle Top

Mold Draft Angle Bottom

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.

DS21137F-page 23

HCS300

Systems Information and Upgrade Hot Line

ON-LINE SUPPORT

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:

Microchip provides on-line support on the Microchip

World Wide Web (WWW) site.

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.

ConnectingtotheMicrochipInternetWebSite

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

DS21137F-page 24

2001 Microchip Technology Inc.

HCS300

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) 792-4150.

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:

Name

Company

Address

City / State / ZIP / Country

Telephone: (_______) _________ - _________

FAX: (______) _________ - _________

Application (optional):

Would you like a reply?

Y

N

Literature Number:

DS21137F

Device:

HCS300

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.

DS21137F-page 25

HCS300

HCS300 PRODUCT IDENTIFICATION SYSTEM

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

HCS300

-

/P

Package:

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

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

Temperature

Range:

Blank = 0°C to +70°C

I = –40°C to +85°C

Device:

HCS300

HCS300T

Code Hopping Encoder

Code Hopping Encoder (Tape and Reel)

=

Sales and Support

Data Sheets

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

and recommended 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

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

DS21137F-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.

DS21137F - 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

DS21137F-page 28

2001 Microchip Technology Inc.


型号：	HCS300-I/P
厂家：	MICROCHIP
描述：	KEE LOQ Code Hopping Encoder KEE LOQ跳码编码器编码器
文件：	总28页 (文件大小：383K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HCS300-I/P [MICROCHIP]

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