HCS360_技术文档

M

HCS360

Code Hopping Encoder

FEATURES

PACKAGE TYPES

PDIP, SOIC

Security

8

7

6

5

VDD

LED

PWM

VSS

S0

1

2

3

4

• Programmable 28/32-bit serial number

• Programmable 64-bit encryption key

• Each transmission is unique

• 67-bit transmission code length

• 32-bit hopping code

• 35-bit ﬁxed code (28/32-bit serial number,

4/0-bit function code, 1-bit status, 2-bit CRC)

• Encryption keys are read protected

S1

S2

S3

Operating

• 2.0-6.6V operation

• Four button inputs

HCS360 BLOCK DIAGRAM

Oscillator

Power

latching

and

- 15 functions available

• Selectable baud rate

• Automatic code word completion

• Battery low signal transmitted to receiver

• Nonvolatile synchronization data

• PWM and Manchester modulation

Controller

Reset circuit

switching

LED

LED driver

EEPROM

Encoder

Other

PWM

• Easy to use programming interface

• On-chip EEPROM

32-bit shift register

• On-chip oscillator and timing components

• Button inputs have internal pull-down resistors

• Current limiting on LED output

• Minimum component count

VSS

Button input port

VDD

Enhanced Features Over HCS300

S₂

S₃

S₁S₀

• 48-bit seed vs. 32-bit seed

• 2-bit CRC for error detection

• 28/32-bit serial number select

• Two seed transmission methods

• PWM and Manchester modulation

• IR modulation mode

DESCRIPTION

The HCS360 is a code hopping encoder designed for

secure Remote Keyless Entry (RKE) systems. The

HCS360 utilizes the KEELOQ code hopping technology,

which incorporates high security, a small package

outline and low cost, to make this device a perfect

solution for unidirectional remote keyless entry systems

and access control systems.

Typical Applications

The HCS360 is ideal for Remote Keyless Entry (RKE)

applications. These applications include:

• Automotive RKE systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage door openers

• Identity tokens

The HCS360 combines

a 32-bit hopping code

generated by a nonlinear encryption algorithm, with a

28/32-bit serial number and 7/3 status bits to create a

67-bit transmission stream. The length of the

transmission eliminates the threat of code scanning

and the code hopping mechanism makes each

transmission unique, thus rendering code capture and

resend (code grabbing) schemes useless.

• Burglar alarm systems

KEELOQ is a registered trademark of Microchip Technology Inc.

*Code hopping encoder patents issued in Europe, U. S. A., R. S. A. — US: 5,517,187; Europe: 0459781

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 1

HCS360

The encryption key, serial number, and conﬁguration

data are stored in EEPROM which is not accessible via

any external connection. This makes the HCS360 a

very secure unit. The HCS360 provides an easy to use

serial interface for programming the necessary security

keys, system parameters, and conﬁguration data.

tem is also a relatively small number. These

shortcomings provide the means for a sophisticated

thief to create a device that ‘grabs’ a transmission and

retransmits it later or a device that scans all possible

combinations until the correct one is found.

The HCS360 employs the KEELOQ code hopping tech-

nology and an encryption algorithm to achieve a high

level of security. Code hopping is a method by which

the code transmitted from the transmitter to the receiver

is different every time a button is pushed. This method,

coupled with a transmission length of 67 bits, virtually

eliminates the use of code ‘grabbing’ or code

‘scanning’.

The encryption keys and code combinations are pro-

grammable but read-protected. The keys can only be

veriﬁed after an automatic erase and programming

operation. This protects against attempts to gain

access to keys and manipulate synchronization values.

The HCS360 operates over a wide voltage range of

2.0V to 6.6V and has four button inputs in an 8-pin

conﬁguration. This allows the system designer the

freedom to utilize up to 15 functions. The only

components required for device operation are the but-

tons and RF circuitry, allowing a very low system cost.

As indicated in the block diagram on page one, the

HCS360 has a small EEPROM array which must be

loaded with several parameters before use. The most

important of these values are:

• A 28/32-bit serial number which is meant to be

unique for every encoder

1.0

SYSTEM OVERVIEW

• An encryption key that is generated at the time of

production

1.1

Key Terms

• A 16-bit synchronization value

• Manufacturer’s code – a 64-bit word, unique to

each manufacturer, used to produce a unique

encryption key in each transmitter (encoder).

The serial number for each transmitter is programmed

by the manufacturer at the time of production. The

generation of the encryption key is done using a key

generation algorithm (Figure 1-1). Typically, inputs to

the key generation algorithm are the serial number of

the transmitter or seed value, and a 64-bit manufac-

turer’s code. The manufacturer’s code is chosen by the

system manufacturer and must be carefully controlled.

The manufacturer’s code is a pivotal part of the overall

system security.

• Encryption Key – a unique 64-bit key generated

and programmed into the encoder during the

manufacturing process. The encryption key

controls the encryption algorithm and is stored in

EEPROM on the encoder device.

• Learn – The HCS product family facilitates several

learning strategies to be implemented on the

decoder. The following are examples of what can

be done.

The 16-bit synchronization value is the basis for the

transmitted code changing for each transmission, and

is updated each time a button is pressed. Because of

the complexity of the code hopping encryption algo-

rithm, a change in one bit of the synchronization value

will result in a large change in the actual transmitted

code. There is a relationship (Figure 1-2) between the

key values in EEPROM and how they are used in the

encoder. Once the encoder detects that a button has

been pressed, the encoder reads the button and

updates the synchronization counter. The synchroniza-

tion value is then combined with the encryption key in

the encryption algorithm and the output is 32 bits of

encrypted information. This data will change with every

button press, 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 the serial

number to form the code word transmitted to the

receiver. The code word format is explained in detail

in Section 4.2.

Normal Learning

The receiver uses the same information that is

transmitted during normal operation to derive the

transmitter’s secret key, decrypt the discrimination

value and the synchronization counter.

Secure Learn*

The transmitter is activated through a special but-

ton combination to transmit a stored 48-bit value

(random seed) that can be used for key genera-

tion or be part of the key. Transmission of the ran-

dom seed can be disabled after learning is

completed.

The HCS360 is a code hopping encoder device that is

designed speciﬁcally for keyless entry systems,

primarily for vehicles and home garage door openers. It

is meant to be a cost-effective, yet secure solution to

such systems. The encoder portion of a keyless entry

system is meant to be held by the user and operated to

gain access to a vehicle or restricted area. The

HCS360 requires very few external components

(Figure 2-1).

Most keyless entry systems transmit the same code

from a transmitter every time a button is pushed. The

relative number of code combinations for a low end sys-

*Secure Learning patents pending.

DS40152C-page 2

Preliminary

1996 Microchip Technology Inc.

HCS360

Any type of controller may be used as a receiver, but it

is typically a microcontroller with compatible ﬁrmware

that allows the receiver to operate in conjunction with a

transmitter, based on the HCS360. Section 7.0

provides more detail on integrating the HCS360 into a

total system.

transmitter, the current synchronization value for that

transmitter and the same encryption key that is used on

the transmitter. If a receiver receives a message of valid

format, the serial number is checked and, if it is from a

learned transmitter, the message is decrypted and the

decrypted synchronization counter is checked against

what is stored. If the synchronization value is veriﬁed,

then the button status is checked to see what operation

is needed. Figure 1-3 shows the relationship between

some of the values stored by the receiver and the val-

ues received from the transmitter.

Before a transmitter can be used with a particular

receiver, the transmitter must be ‘learned’ by the

receiver. Upon learning a transmitter, information is

stored by the receiver so that it may track the

transmitter, including the serial number of the

FIGURE 1-1: CREATION AND STORAGE OF ENCRYPTION KEY DURING PRODUCTION

HCS360 EEPROM Array

Transmitter

Serial Number or

Seed

Serial Number

Encryption Key

Sync Counter

.

Key

Encryption

Key

Manufacturer’s

Code

Generation

Algorithm

FIGURE 1-2: BASIC OPERATION OF TRANSMITTER (ENCODER)

Transmitted Information

KEELOQ

Encryption

Algorithm

Button Press

Information

32 Bits of

Encrypted Data

Serial Number

EEPROM Array

Decryption Key

Sync Counter

Serial Number

FIGURE 1-3: BASIC OPERATION OF RECEIVER (DECODER)

Check for

Match

EEPROM Array

KEELOQ

Decrypted

Synchronization

Counter

Decryption

Algorithm

Decryption Key

Sync Counter

Check for

Match

Serial Number

Manufacturer Code

32 Bits of

Encrypted Data

Button Press

Information

Serial Number

Received Information

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 3

HCS360

The high security level of the HCS360 is based on the

patented KEELOQ technology. A block cipher type of

encryption algorithm 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 the information in the previous transmis-

sion, the next coded transmission will be totally differ-

ent. Statistically, if only one bit in the 32-bit string of

information changes, approximately 50 percent of the

coded transmission will change.The HCS360 will wake

up upon detecting a switch closure and then delay

approximately 6.5 ms for switch debounce (Figure 2-2).

The synchronization information, ﬁxed information, and

switch information will be encrypted to form the hopping

code. The encrypted or hopping code portion of the

transmission will change every time a button is

pressed, even if the same button is pushed again.

Keeping a button pressed for a long time will result in

the same code word being transmitted until the button

is released or time-out occurs. A code that has been

transmitted will not occur again for more than 64K

transmissions. This will provide more than 18 years of

typical use before a code is repeated based on 10 oper-

ations per day. Overﬂow information programmed into

the encoder can be used by the decoder to extend the

number of unique transmissions to more than 128K.

2.0

DEVICE OPERATION

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

the HCS360 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 described in Table 2-1.

FIGURE 2-1: TYPICAL CIRCUITS

VDD

B0

B1

S0

VDD

LED

PWM

VSS

S1

S2

S3

Tx out

2 button remote control

VDD

B4 B3 B2 B1 B0

S0

VDD

LED

PWM

VSS

S1

S2

S3

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

ton(s) has been pressed, a reset will immediately be

forced and the 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 current code word will be completed

and the power down will occur.

Tx out

5 button remote control (Note)

Note: Up to 15 functions can be implemented by

pressing more than one button simulta-

neously or by using a suitable diode array.

TABLE 2-1

PIN DESCRIPTIONS

Description

Name

Number

S0

S1

S2

1

2

3

Switch input 0

Switch input 1

Switch input 2/Can also be clock

pin when in programming mode

S3

4

Switch input 3/Clock pin when in

programming mode

VSS

5

6

Ground reference connection

PWM

Pulse width modulation (PWM)

output pin/Data pin for

programming mode

LED

VDD

7

8

Cathode connection for directly

driving LED during transmission

Positive supply voltage

connection

DS40152C-page 4

Preliminary

1996 Microchip Technology Inc.

HCS360

FIGURE 2-2: ENCODER OPERATION

3.0

EEPROM MEMORY

ORGANIZATION

Power Up

(A button has been pressed)

The HCS360 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.

Reset and Debounce Delay

(6.5 ms)

Sample Inputs

TABLE 3-1

EEPROM MEMORY MAP

Update Sync Info

WORD

ADDRESS

MNEMONIC

DESCRIPTION

Encrypt With

Encryption Key

0

1

2

3

4

5

KEY_0

64-bit encryption

key (word 0)

64-bit encryption

key (word 1)

64-bit encryption

key (word 2)

64-bit encryption

key (word 3)

KEY_1

KEY_2

Load Transmit Register

Transmit

KEY_3

Buttons

Added

Yes

SYNC_A

16-bit synchroniza-

tion value

?

No

SYNC_B/SEED_2 16-bit synchroniza-

tion or seed value

No

(word 2)

Set to 0000H

Seed Value (word 0)

Seed Value (word 1)

Device Serial

All

Buttons

Released

?

6

7

8

7

RESERVED

SEED_0

SEED_1

SER_0

Yes

Complete Code

Word Transmission

Number (word 0)

10

11

SER_1

Device Serial

Number (word 1)

Conﬁguration Word

Stop

CONFIG

3.1

Key_0 - Key_3 (64-Bit Encryption Key)

The 64-bit encryption key is used by the transmitter to

create the encrypted message transmitted to the

receiver. This key is created and programmed at the

time of production using a key generation algorithm.

Inputs to the key generation algorithm are the serial

number for the particular transmitter being used and a

secret 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 creat-

ing the key for decryption purposes. If a seed is used,

the seed will also form part of the input to the key gen-

eration algorithm.

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 5

HCS360

3.2

SYNC_A, SYNC_B

(Synchronization Counter)

TABLE 3-2

CONFIGURATION WORD

Bit Number Symbol

Bit Description

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

create the hopping code for transmission. This value

will be changed after every transmission. A second syn-

chronization value can be used to stay synchronized

with a second receiver.

0

1

LNGRD Long Guard Time

FAST 0 Baud Rate Selection

FAST 1 Baud Rate Selection

2

3

NU

Not Used

4

SEED

DELM

TIMO

IND

Seed Transmission enable

Delay mode enable

Time out enable

3.3

SEED_0, SEED_1, and SEED_2

(Seed Word)

5

6

This is the three word (48 bits) seed code that will be

transmitted when seed transmission is selected. This

allows the system designer to implement the secure learn

feature or use this ﬁxed code word as part of a different

key generation/tracking process or purely as a ﬁxed code

transmission.

7

Independent mode enable

8

USRA0 User bit

USRA1 User bit

USRB0 User bit

USRB1 User bit

9

10

11

12

3.4

SER_0, SER_1

(Encoder Serial Number)

XSER

Extended serial number

enable

13

14

15

TMPSD Temporary seed transmis-

sion enable

SER_0 and SER_1 are the lower and upper words of

the device serial number, respectively.There are 32 bits

allocated for the serial number and a selectable conﬁg-

uration bit determines whether 32 or 28 bits will be

transmitted. The serial number is meant to be unique

for every transmitter.

MANCH Manchester/PWM modula-

tion selection

OVR

Overﬂow bit

3.5.1

LNGRD: LONG GUARD TIME

3.5

CONFIG

(Conﬁguration Word)

LNGRD = 1 selects the encoder to extend the guard

time between code words. This can be used to reduce

the average power transmitted over a 100ms window

and thereby transmit a higher peak power.

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. Further

explanations of each of the bits are described in the

following sections.

3.5.2

FAST 1, FAST 0 BAUD RATE SELECTION

FAST 1 and FAST 0 selects the baud rate according to

Table 3-3.

TABLE 3-3

BAUD RATE SELECTION

TE

FAST 1

FAST 0

400

200

100

0

1

0

1

0

1

DS40152C-page 6

Preliminary

1996 Microchip Technology Inc.

HCS360

3.5.3

SEED: ENABLE SEED TRANSMISSION

mation (SEED_0, SEED_1, and SEED_2) and the

upper 12- or 16-bits of the serial number (SER_1) are

transmitted instead of the hop code.

If SEED = 0, seed transmission is disabled. The inde-

pendent counter mode can only be used with seed

transmission disabled since SEED_2 is shared with the

second synchronization counter.

Seed transmission is available for function codes

(Table 3-7) S[3:0] = 1001 and S[3:0] = 0011(delayed).

This takes place regardless of the setting of the IND bit.

The two seed transmissions are shown in Figure 3-1.

With SEED = 1, seed transmission is enabled. The

appropriate button code(s) must be activated to trans-

mit the seed information. In this mode, the seed infor-

FIGURE 3-1: SEED TRANSMISSION

All examples shown with XSER = 1, SEED = 1

When S[3:0] = 1001, delay is not acceptable.

CRC+VLOW SER_1

SEED_2

SEED_1

SEED_0

Data transmission direction

For S[3:0] = 0x3 before delay:

16-bit Data Word

16-bit Counter

Encrypt

CRC+VLOW SER_1

SER_0

Encrypted Data

SEED_1

Data transmission direction

For S[3:0] = 0011 after delay (Note 1, Note 2):

CRC+VLOW SER_1 SEED_2

SEED_0

Data transmission direction

Note 1: For Seed Transmission, SEED_2 is transmitted instead of SER_0.

2: For Seed Transmission, the setting of DELM has no effect.

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 7

HCS360

3.5.4

DELM: DELAY MODE

3.5.5

TIMO: TIME-OUT

If DELM = 1, delay transmission is enabled. A delayed

transmission is indicated by inverting the lower nibble of

the discrimination value.The delay mode is primarily for

compatibility with previous KEELOQ devices. If

DELM = 0, delay transmission is disabled (Table 3-4).

If TIMO = 1, the time-out is enabled. Time-out can be

used to terminate accidental continuous transmissions.

When time-out occurs, the PWM output is set low and

the LED is turned off. Current consumption will be

higher than in standby mode since current will ﬂow

through the activated input resistors. This state can be

exited only after all inputs are taken low. TIMO = 0, will

enable continuous transmission (Table 3-5).

TABLE 3-4

FAST1

TYPICAL DELAY TIMES

Number of Code

Time Before Delay Mode

(MANCH = 0)

Time Ref Delay Mode

(MANCH = 1)

FAST0

Words before Delay

Mode

0

1

0

1

0

1

28

56

28

56

≈ 2.9s

≈ 3.1s

≈ 1.5s

≈ 1.7s

≈ 5.1s

≈ 6.4s

≈ 3.2s

≈ 4.5s

TABLE 3-5

FAST 1

TYPICAL TIME-OUT TIMES

Maximum Number of

Time Before Time-out

(MANCH = 0)

Time Before Time-out

(MANCH = 1)

FAST 0

Code Words Transmitted

0

1

0

1

0

1

256

512

256

512

≈ 26.5s

≈ 28.2s

≈ 14.1s

≈ 15.7s

≈ 46.9

≈ 58.4

≈ 29.2

≈ 40.7

DS40152C-page 8

Preliminary

1996 Microchip Technology Inc.

HCS360

3.5.6

IND: INDEPENDENT MODE

3.5.9

TMPSD: TEMPORARY SEED

TRANSMISSION

The independent mode can be used where one

encoder is used to control two receivers. Two counters

(SYNC_A and SYNC_B) are used in independent

mode. As indicated in Table 3-7, function codes 1 to 7

use SYNC_A and 8 to 15 SYNC_B. The independent

mode also selects IR mode. In IR mode function codes

12 to 15 will use SYNC_B. The PWM output signal is

modulated with a 40 kHz carrier. It must be pointed out

the 40 kHz is derived from the internal clock and will

therefore vary with the same percentage as the baud

rate. If IND = 0, SYNC_A is used for all function codes.

If IND = 1, independent mode is enabled and counters

for functions are used according to Table 3-7.

The temporary seed transmission can be used to dis-

able learning after the transmitter has been used for a

programmable number of operations. This feature can

be used to implement very secure systems. After learn-

ing is disabled, the seed information cannot be

accessed even if physical access to the transmitter is

possible. If TMPSD = 1 the seed transmission will be

disabled after a number of code hopping transmissions.

The number of transmissions before seed transmission

is disabled, can be programmed by setting the synchro-

nization counter (SYNC_A, SYNC_B) to a value as

shown in Table .

TABLE 3-6

SYNCHRONOUS COUNTER

INITIALIZATION VALUES

For IND = 1 and S[3:0] ≡ 0xC, 0xD, 0xE, 0xF, Basic

Pulse Width modulation becomes:

3.5.7

USRA,B: USER BITS

Synchronous Counter

Values

Number of

Transmissions

User bits form part of the discrimination value.The user

bits together with the IND bit can be used to identify the

counter that is used in independent mode.

0000H

0060H

0050H

0048H

128

64

32

3.5.8

XSER: EXTENDED SERIAL NUMBER

16

If XSER = 1, the full 32-bit serial number [SER_1,

SER_0] is transmitted. If XSER = 0, the four most sig-

niﬁcant bits of the serial number are substituted by

S[3:0] and is compatible with the HCS200/300/301.

TABLE 3-7

FUNCTION CODES

S3

S2

S1

S0

IND = 0

IND = 1

Comments

Counter

1

2

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

A

3

A

If SEED = 1, transmit seed after delay.

4

A

5

A

6

A

7

A

8

B

9

If SEED = 1, transmit seed immediately.

10

11

12

13

14

15

B

B IR mode

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 9

HCS360

3.5.10 MANCH: MANCHESTER CODE

MODULATION

4.0

TRANSMITTED WORD

4.1

Transmission Format (PWM)

MANCH selects between Manchester code modulation

and PWM modulation. If MANCH = 1, Manchester code

modulation is selected:

The HCS360 transmission is made up of several parts

(Figure 4-1 and Figure 4-2). Each transmission is

begun with a preamble and a header, followed by the

encrypted and then the ﬁxed data. The actual data is

67 bits which consists of 32 bits of encrypted data and

35 bits of ﬁxed data. Each transmission is followed by

a guard period before another transmission can begin.

Refer to Table 8-4 and Table 8-5 for transmission timing

speciﬁcations. The encrypted portion provides up to

four billion changing code combinations and includes

the function bits (based on which buttons were acti-

vated) along with the synchronization counter value

and discrimination value. The non-encrypted portion is

comprised of the CRC bits, VLOW bits, the function bits

and the 28/32-bit serial number. The encrypted and

If MANCH = 0, PWM modulation is selected.

3.5.11 OVR: OVERFLOW

The overﬂow bit is used to extend the number of possi-

ble 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 bit can be utilized to extend the number of

unique values. This can be done by programming OVR

to 1 at the time of production.The encoder will automat-

ically clear OVR the ﬁrst time that the transmitted syn-

chronization value wraps from 0xFFFF to 0x0000.

Once cleared, OVR cannot be set again, thereby creat-

ing a permanent record of the counter overﬂow. This

prevents fast cycling of 64K counter. If the decoder sys-

tem is programmed to track the overﬂow bits, then the

effective number of unique synchronization values can

be extended to 128K. If programmed to zero, the sys-

tem will be compatible with the NTQ104/5/6 devices

(i.e., no overﬂow with discrimination bits set to zero).

non-encrypted sections combined increase the number

of combinations to 1.47 x 10

20

.

4.2

Code Word Organization

The HCS360 transmits a 67-bit code word when a but-

ton is pressed. The 67-bit word is constructed from a

Fixed Code portion and an Encrypted Code portion

(Figure 4-3).

The Encrypted Data is generated from 4 function bits,

2 user bits, overﬂow bit, independent mode bit, and 8

serial number bits, and the 16-bit synchronization value

(Figure 8-4).

The Non-encrypted Code Data is made up of a VLOW

bit, 2 CRC bits, 4 function bits, and the 28-bit serial

number. If the extended serial number (32 bits) is

selected, the 4 function code bits will not be transmit-

ted.

DS40152C-page 10

Preliminary

1996 Microchip Technology Inc.

HCS360

FIGURE 4-1: TRANSMISSION FORMAT—MANCH = 0

TOTAL TRANSMISSION:

1 CODE WORD

Guard

Encrypt

Preamble Sync Encrypt

Sync

Fixed

Preamble

CODE WORD:

TE

LOGIC "0"

LOGIC "1"

BIT

TE

6

16

1

3 5 7 9

4 6 8 10

1

2

4 5

2

13 14 15

Guard

Time

Encrypted

TX Data

Fixed Code

Data

Sync

Preamble

Code Word

FIGURE 4-2: TRANSMISSION FORMAT—MANCH = 1

TOTAL TRANSMISSION:

1 CODE WORD

Preamble Sync Encrypt

Preamble Sync Encrypt Fixed

Guard

CODE WORD:

TE

LOGIC "0"

LOGIC "1"

Stop bit

BPW

6

Start bit

16

1

3

2

4

13 14 15

1

2

4 5

Guard

Time

Encrypted

Data

Fixed Code

Data

Preamble

Sync

CODE WORD

FIGURE 4-3: CODE WORD ORGANIZATION (RIGHT-MOST BIT IS CLOCKED OUT FIRST)

Fixed Code Data

Encrypted Code Data

Button

Status

(4 bits)

Button

Status

(4 bits)

Discrimination

bits

28-bit

Serial Number

16-bit

Synch Value

CRC

(2 bit)

VLOW

(1 bit)

(12 bits)

MSB

LSB

67 bits

of Data

Transmitted

Serial Number and

Button Status (32 bits)

CRC

(2 bit)

VLOW

bit

+

32 bits of Encrypted Data

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 11

HCS360

5.4

Secure Learning

5.0

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 learning function. This can be done by utilizing

the seed value on the HCS360 which is stored in

EEPROM. Instead of the normal key generation method

being used to create the encryption key, this seed value

is used and there should not be any mathematical rela-

tionship between serial numbers and seeds for the best

security.

5.1

Code Word Completion

Code word completion is an automatic feature that

ensures that the entire code word is transmitted, even

if the button is released before the transmission is com-

plete and that a minimum of two words are completed.

The HCS360 encoder powers itself up when a button is

pushed and powers itself down after two complete

words are transmitted if the user has already released

the button. If the button is held down beyond the time

for one transmission, then multiple transmissions will

5.5

Auto-shutoff

result. If another button is activated during

a

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 func-

tion can be enabled or disabled and is selected by set-

ting or clearing the time-out bit (Section 3.5.5). Setting

this bit will enable the function (turn Auto-shutoff func-

tion on) and clearing the bit will disable the function.

Time-out period is approximately 25 seconds.

transmission, the active transmission will be aborted

and the new code will be generated using the new

button information.

5.2

Long Guard Time

Federal Communications Commission (FCC) part 15

rules specify the limits on fundamental power and

harmonics that can be transmitted. Power is calculated

on the worst case average power transmitted in a

100ms window. It is therefore advantageous to

minimize the duty cycle of the transmitted word. This

can be achieved by minimizing the duty cycle of the

individual bits and by extending the guard time between

transmissions. long guard time (LNGRD) is used for

reducing the average power of a transmission.This is a

selectable feature. Using the LNGRD allows the user to

5.6

VLOW:Voltage LOW Indicator

The VLOW bit is transmitted with every transmission

(Figure 4-2) and will be transmitted as a one if the

operating voltage has dropped below the low voltage

trip point, approximately 3.8V at 25°C.This VLOW signal

is transmitted so the receiver can give an indication to

the user that the transmitter battery is low.

transmit

a higher amplitude transmission if the

transmission time per 100 ms is shorter. The FCC puts

constraints on the average power that can be

transmitted by a device, and LNGRD effectively

prevents continuous transmission by only allowing the

transmission of every second word. This reduces the

average power transmitted and hence, assists in FCC

approval of a transmitter device.

5.7

LED Output Operation

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

1Hz during the transmission.

5.3

CRC (Cycle Redundancy Check) Bits

The CRC bits are calculated on the 65 previously trans-

mitted bits. The CRC bits can be used by the receiver

to check the data integrity before processing starts.The

CRC can detect all single bit and 66% of double bit

errors. The CRC is computed as follows:

EQUATION 5-1:

CRC CALCULATION

CRC[1]_{n + 1}= CRC[0]_nDi_n

and

with

CRC[0]_{n + 1}= (CRC[0]_nDi_n) CRC[1]_n

CRC[1, 0]₀= 0

and

Di the nth transmission bit 0 ≤ n ≤ 64

n

DS40152C-page 12

Preliminary

1996 Microchip Technology Inc.

HCS360

loaded, a programming delay is required for the internal

program cycle to complete. The acknowledge can read

back after the programming delay (TWC). After the ﬁrst

word and its complement have been downloaded, an

automatic bulk write is performed. This delay can take

up to Twc. 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 S3 line and

reading the data bits on PWM. For security reasons, it

is not possible to execute a verify function without ﬁrst

programming the EEPROM. A verify operation can

only be done once, immediately following the pro-

gram cycle.

6.0

PROGRAMMING THE HCS360

When using the HCS360 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 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 S3 line has been

held high for the appropriate length of time. S0 and S1

should be held low during the entire program cycle

(Table 6-1 and Figure 6-1).The device can then be pro-

grammed by clocking in 16 bits at a time, followed by

the word’s complement using S3 or S2 as the clock line

and PWM as the data in line. After each 16-bit word is

FIGURE 6-1: PROGRAMMING WAVEFORMS

Enter Program

TWC

TCLKH

Mode

TDS

S2/S3

(Clock)

T

1

Acknowledge

TDH

TCLKL

PWM

Bit 0 Bit 1 Bit 2 Bit 3

Bit 14 Bit 15

Bit 0 Bit 1 Bit 2 Bit 3

Bit 14 Bit 15

Bit 16 Bit 17

(Data)

T

Data for Word 1

Data for Word 0 (KEY_0)

2

Repeat 12 times for each word

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

Begin Verify Cycle Here

End of

Programming Cycle

Data in Word 0

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.

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

T

0

4.0

—

ms

2

T

9.0

1

Program cycle time

Clock low time

TWC

TCLKL

TCLKH

TDS

—

25

0

30

—

24

ms

µs

Clock high time

Data setup time

Data hold time

TDH

18

—

Data out valid time

TDV

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 13

HCS360

FIGURE 7-1: TYPICAL LEARN SEQUENCE

7.0

INTEGRATING THE HCS360

INTO A SYSTEM

Enter Learn

Mode

Use of the HCS360 in a system requires a compatible

decoder.This decoder is typically a microcontroller with

compatible ﬁrmware. Firmware routines that accept

transmissions from the HCS360 and decrypt the

hopping code portion of the data stream are available.

These routines provide system designers the means to

develop their own decoding system.

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

In order for a transmitter to be used with a decoder, the

transmitter must ﬁrst be ‘learned’. Several learning

strategies can be followed in the decoder implementa-

tion. When a transmitter is learned to a decoder, it is

suggested that the decoder stores the serial number

and current synchronization value in EEPROM. The

decoder must keep track of these values for every

transmitter that is learned (Figure 7-1). The maximum

number of transmitters that can be learned is only a

function of how much EEPROM memory storage is

available. The decoder must also store the manufac-

turer’s code in order to learn a transmission transmitter,

although this value will not change in a typical system

so it is usually stored as part of the microcontroller

ROM code. Storing the manufacturer’s code as part of

the ROM code is also better for security reasons.

Compare Discrimination

Value with Fixed Value

No

Equal

?

Yes

Wait for Reception

of Second Valid Code

Use Generated Key

to Decrypt

Compare Discrimination

Value with Fixed Value

It must be stated that some learning strategies have

been patented and care must be taken not to infringe.

No

Equal

?

Yes

No

Counters

Sequential

?

Yes

Learn

Unsuccessful

Learn successful Store:

Serial number

Encryption key

Synchronization counter

Exit

DS40152C-page 14

Preliminary

1996 Microchip Technology Inc.

HCS360

7.2

Decoder Operation

7.3

Synchronization with Decoder

In a typical decoder operation (Figure 7-2), the key gen-

eration on the decoder side is done by taking the serial

number from a transmission and combining that with

the manufacturer’s code to create the same secret key

that was used by the transmitter. Once the secret key is

obtained, the rest of the transmission can be decrypted.

The decoder waits for a transmission and immediately

can check the serial number to determine if it is a

learned transmitter. If it is, it takes the encrypted portion

of the transmission and decrypts it using the stored key

It uses the discrimination bits to determine if the

decryption was valid. If everything up to this point is

valid, the synchronization value is evaluated.

The KEELOQ technology features a sophisticated

synchronization technique (Figure 7-3) which does not

require the calculation and storage of future codes. If

the stored counter value for that particular transmitter

and the counter value that was just decrypted are within

a formatted window of say 16, the counter is stored and

the command is executed. If the counter value was not

within the single operation window, but is within the

double operation window of say 32K window, the trans-

mitted synchronization value is stored in temporary

location and it goes back to waiting for another trans-

mission. When the next valid transmission is received,

it will check the new value with the one in temporary

storage. If the two values are sequential, it is assumed

that the counter had just gotten out of the single opera-

tion ‘window’, but is now back in sync, so the new syn-

chronization value is stored and the command

executed. If a transmitter has somehow gotten out of

the double operation window, the transmitter will not

work and must be relearned. Since the entire window

rotates after each valid transmission, codes that have

been used are part of the ‘blocked’(32K) codes and are

no longer valid. This eliminates the possibility of grab-

bing a previous code and retransmitting to gain entry.

FIGURE 7-2: TYPICAL DECODER

OPERATION

Start

No

Transmission

Received

?

Yes

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

Does

Serial Number

Match

No

?

Yes

Decrypt Transmission

FIGURE 7-3: SYNCHRONIZATION WINDOW

Entire Window

rotates to eliminate

use of previously

used codes

Is

No

Decryption

Valid

?

Blocked

(32K Codes)

Yes

Current

Execute

Command

and

Update

Counter

Is

Counter

Within 16

?

Position

Yes

No

Double

Operation

(32K Codes)

Single Operation

Window (16 Codes)

No

Is

Counter

Within 32K

?

Yes

Save Counter

in Temp Location

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 15

HCS360

8.0

ELECTRICAL CHARACTERISTICS

TABLE 8-1

ABSOLUTE MAXIMUM RATINGS

Item

Symbol

Rating

Units

VDD

VIN

Supply voltage

Input voltage

-0.3 to 6.9

-0.3 to VDD + 0.3

25

V

VOUT

IOUT

Output voltage

Max output current

Storage temperature

Lead soldering temp

ESD rating

mA

TSTG

TLSOL

VESD

-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 < 3.3

3.0 < VDD < 6.6

Uni

t

Typ

1

Typ

1

Parameter

Sym.

Min

Max

Min

Max

Conditions

Operating current (avg)

ICC

0.3

1.2

mA

VDD = 3.3V

VDD = 6.6V

0.7

0.1

160

1.6

1.0

350

Standby current

ICCS

VIH

0.1

40

1.0

µA

V

2,3

Auto-shutoff current

75

High level Input voltage

0.55VD

D

VDD+0. 0.55VD

VDD+0.

3

D

Low level input voltage

VIL

-0.3

0.15VD

D

-0.3

0.15VD

D

V

High level output voltage VOH 0.7VDD

Low level output voltage VOL

0.7VDD

IOH = -1.0mA, VDD = 2.0V

IOH = -2.0mA, VDD = 6.6V

0.08VD

D

0.08VD

D

IOL = 1.0mA, VDD = 2.0V

IOL = 2.0mA, VDD = 6.6V

LED sink current

ILED

0.15

40

1.0

60

4.0

80

0.15

40

1.0

60

4.0

80

mA VLED = 1.5V, VDD = 6.6V

Resistance; S0-S3

RS0-

3

kΩ

VDD=4.0V

Resistance; PWM

RPW

M

80

120

160

80

120

160

kΩ

VDD=4.0V

Note 1: Typical values are at 25°C.

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

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

DS40152C-page 16

Preliminary

1996 Microchip Technology Inc.

HCS360

FIGURE 8-1: POWER UP AND TRANSMIT TIMING

Button Press

Detect

Code Word Transmission

TBP

TTD

TDB

Code

Word

3

Code

Word

2

Code

Word

n

Word

PWM

1

TTO

Sn

TABLE 8-3

POWER UP AND TRANSMIT TIMING REQUIREMENTS

VDD = +2.0 to 6.6V

Commercial (C): Tamb = 0°C to +70°C

Industrial

(I): Tamb = -40°C to +85°C

Parameter

Symbol

Min

Max

Unit

Remarks

Time to second button press

TBP

10 + Code 26 + Code

Word Time Word Time

ms

(Note 1)

Transmit delay from button detect

Debounce delay

TTD

TDB

TTO

4.5

4.0

26

13

35

ms

s

(Note 2)

Auto-shutoff time-out period

15.0

(Note 3)

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: Transmit delay maximum value if the previous transmission was successfully transmitted.

3: The auto shutoff timeout period is not tested.

FIGURE 8-2: PWM FORMAT (MANCH = 0)

TE TE

TE

LOGIC ‘0’

LOGIC ‘1’

TBP

Encrypted Portion

of Transmission

Fixed portion of

Transmission

TFIX

Guard

Time

TG

Header

TH

Preamble

TP

THOP

FIGURE 8-3: PWM PREAMBLE/HEADER FORMAT

Data Word

Transmission

Preamble

Header

Bit 0 Bit 1

10 TE

32 TE

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 17

HCS360

FIGURE 8-4: PWM DATA WORD FORMAT

Serial Number

Function Code

Status

CRC

LSB

MSB LSB

MSB S3

S0

S1

S2 VLOW CRC0 CRC1

Bit 0 Bit 1

Bit 66

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

Bit 62 Bit 63 Bit 64 Bit 65

Bit 61

Guard

Time

Fixed Code Data

Encrypted Data

Header

FIGURE 8-5: MANCHESTER FORMAT (MANCH = 1)

TE TE

LOGIC ‘0’

LOGIC ‘1’

TBP

Encrypted Portion

of Transmission

Fixed portion of

Transmission

TFIX

Guard

Time

TG

Header

TH

Preamble

TP

THOP

FIGURE 8-6: MANCHESTER PREAMBLE/HEADER FORMAT

Data Word

Transmission

Preamble

Header

Bit 0 Bit 1

32 TE

4 TE

FIGURE 8-7: HCS360 NORMALIZED TE VS.TEMP

1.7

1.6

Typical

TE Max.

VDD LEGEND

= 2.0V

1.5

1.4

1.3

= 3.0V

= 6.0V

1.2

TE

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

Temperature °C

DS40152C-page 18

Preliminary

1996 Microchip Technology Inc.

HCS360

TABLE 8-4

CODE WORD TRANSMISSION TIMING PARAMETERS—PWM MODE

VDD = +2.0V to 6.6V

Commercial (C):Tamb = 0°C to +70°C

Industrial (I):Tamb = -40°C to +85°C

Code Words Transmitted

FAST1 = 0,

FAST0 = 0

FAST0 = 1

Number

of TE

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

260

400

620

1

3

130

390

4.2

1.3

200

600

6.4

2.0

310

930

9.9

3.1

µs

780 1200 1860

µs

32

10

96

105

16

259

—

8.3

2.6

12.8 19.8

4.0 6.2

32

10

96

105

32

275

—

ms

TH

THOP

TFIX

TG

Hopping code duration

Fixed code duration

Guard Time (LNGRD = 0)

Total transmit time

PWM data rate

25.0 38.4 59.5

27.3 42.0 65.1

12.5 19.2 29.8

13.7 21.0 32.6

4.2

67.3 103.6 160.6

1282 833 538

6.4

9.9

4.2

6.4

9.9

—

35.8 55.0 85.3

—

2564 1667 1075 bps

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

VDD = +2.0V to 6.6V

Commercial (C):Tamb = 0°C to +70°C

Industrial (I):Tamb = -40°C to +85°C

Code Words Transmitted

FAST1 = 1,

FAST0 = 0

FAST1 = 1,

FAST0 = 1

Number

of TE

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

130

390

4.2

200

600

6.4

310

930

9.9

1

3

65

195

2.1

0.7

6.2

6.8

4.2

20.0

100

300

3.2

155

465

5.0

µs

32

10

96

105

32

275

—

32

10

96

105

64

307

—

ms

bps

TH

1.3

2.0

3.1

1.0

1.6

THOP

TFIX

TG

Hopping code duration

Fixed code duration

Guard Time (LNGRD = 0)

Total transmit time

PWM data rate

12.5

13.7

4.2

19.2

21.0

6.4

29.8

32.6

9.9

9.6

14.9

16.3

9.9

10.5

6.4

—

35.8

2564

55.0

1667

85.3

1075

30.7

47.6

—

5128 3333 2151

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

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 19

HCS360

TABLE 8-5

CODE WORD TRANSMISSION TIMING PARAMETERS—MANCHESTER MODE

VDD = +2.0V to 6.6V

Commercial (C):Tamb = 0°C to +70°C

Industrial (I):Tamb = -40°C to +85°C

Code Words Transmitted

FAST1 = 0,

FAST0 = 0

FAST0 = 1

Number

of TE

Number

of Te

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ. Max. Units

TE

TP

TH

Basic pulse element

Preamble duration

Header duration

1

32

4

520

16.6

2.1

800

25.6

3.2

1240

39.7

5.0

1

32

4

260

8.3

400

12.8

1.6

620

19.8

2.5

µs

ms

1.0

TSTART Start bit

2

1.0

1.6

2.5

2

0.5

0.8

1.2

THOP

TFIX

Hopping code duration

Fixed code duration

64

70

2

33.3

36.4

1.0

51.2

56.0

1.6

79.4

86.8

2.5

64

70

2

16.6

18.2

0.5

25.6

28.0

0.8

39.7

43.4

1.2

TSTOP Stop bit

TG

—

Guard Time (LNGRD = 0)

8

4.2

6.4

9.9

16

196

—

4.2

6.4

9.9

Total transmit time

182

—

94.6

1923

145.6 223.7

1250 806

50.76 78.4 121.5

Manchester data rate

3846.2 2500 1612.9 bps

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

VDD = +2.0V to 6.6V

Commercial (C):Tamb = 0°C to +70°C

Industrial (I):Tamb = -40°C to +85°C

Code Words Transmitted

FAST1 = 1,

FAST0 = 0

FAST1 = 1.

FAST0 = 1

Number

of TE

Number

of Te

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max. Units

TE

TP

TH

Basic pulse element

Preamble duration

Header duration

1

32

4

260

8.3

400

12.8

1.6

620

19.8

2.5

1

32

4

130

4.2

0.5

0.3

8.3

9.1

0.3

4.2

27.6

200

6.4

310

9.9

µs

ms

1.0

0.8

1.2

TSTART Start bit

2

0.5

0.8

1.2

2

0.4

0.6

THOP

TFIX

Hopping code duration

Fixed code duration

64

70

2

16.6

18.2

0.5

25.6

28.0

0.8

39.7

43.4

1.2

64

70

2

12.8

14.0

0.4

19.8

21.7

0.6

TSTOP Stop bit

TG

—

Guard Time (LNGRD = 0)

16

196

—

4.2

6.4

9.9

32

212

—

6.4

9.9

Total transmit time

50.96

78.4

121.5

42.4

65.7

Manchester data rate

3846.2 2500.0 1612.9

7692.3 5000.0 3225.8 bps

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

DS40152C-page 20

Preliminary

1996 Microchip Technology Inc.

HCS360

NOTES:

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 21

HCS360

NOTES:

DS40152C-page 22

Preliminary

1996 Microchip Technology Inc.

HCS360

HCS360 PRODUCT IDENTIFICATION SYSTEM

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

HCS360 /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:

HCS360

HCS360T

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 recom-

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

1. Your local Microchip sales ofﬁce (see last page)

2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277

3. The Microchip’s Bulletin Board, via your local CompuServe number (CompuServe membership NOT required).

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

1996 Microchip Technology Inc.

Preliminary

DS40152C-page 23

WORLDWIDE SALES & SERVICE

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RM 3801B, Tower Two

Metroplaza

223 Hing Fong Road

Kwai Fong, N.T., Hong Kong

Tel: 852-2-401-1200 Fax: 852-2-401-3431

Arizona Microchip Technology Ltd.

Unit 6, The Courtyard

Meadow Bank, Furlong Road

Bourne End, Buckinghamshire SL8 5AJ

Tel: 44-1628-851077 Fax: 44-1628-850259

France

Atlanta

India

Arizona Microchip Technology SARL

Zone Industrielle de la Bonde

2 Rue du Buisson aux Fraises

91300 Massy, France

Microchip Technology Inc.

500 Sugar Mill Road, Suite 200B

Atlanta, GA 30350

Microchip Technology India

No. 6, Legacy, Convent Road

Bangalore 560 025, India

Tel: 91-80-299-4036 Fax: 91-80-559-9840

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

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

Boston

Korea

Germany

Microchip Technology Inc.

5 Mount Royal Avenue

Marlborough, MA 01752

Tel: 508-480-9990 Fax: 508-480-8575

Microchip Technology Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Korea

Arizona Microchip Technology GmbH

Gustav-Heinemann-Ring 125

D-81739 Müchen, Germany

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

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

Chicago

Italy

Shanghai

Microchip Technology

RM 406 Shanghai Golden Bridge Bldg.

2077 Yan’an Road West, Hongiao District

Shanghai, PRC 200335

Tel: 86-21-6275-5700

Microchip Technology Inc.

333 Pierce Road, Suite 180

Itasca, IL 60143

Arizona Microchip Technology SRL

Centro Direzionale Colleone

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Milan, Italy

Tel: 39-39-6899939 Fax: 39-39-6899883

Tel: 708-285-0071 Fax: 708-285-0075

Dallas

Microchip Technology Inc.

14651 Dallas Parkway, Suite 816

Dallas, TX 75240-8809

Tel: 972-991-7177 Fax: 972-991-8588

Fax: 86 21-6275-5060

Singapore

Microchip Technology Taiwan

Singapore Branch

200 Middle Road

#10-03 Prime Centre

Singapore 188980

JAPAN

Microchip Technology Intl. Inc.

Benex S-1 6F

3-18-20, Shin Yokohama

Kohoku-Ku, Yokohama

Kanagawa 222 Japan

Dayton

Microchip Technology Inc.

Two Prestige Place, Suite 150

Miamisburg, OH 45342

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

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

Taiwan, R.O.C

Microchip Technology Taiwan

10F-1C 207

Tung Hua North Road

Taipei, Taiwan, ROC

Tel: 886 2-717-7175 Fax: 886-2-545-0139

Los Angeles

Tel: 81-4-5471- 6166 Fax: 81-4-5471-6122

Microchip Technology Inc.

18201 Von Karman, Suite 1090

Irvine, CA 92612

1/14/97

Tel: 714-263-1888 Fax: 714-263-1338

NewYork

Microchip Technology Inc.

150 Motor Parkway, Suite 416

Hauppauge, NY 11788

Tel: 516-273-5305 Fax: 516-273-5335

San Jose

Microchip Technology Inc.

2107 North First Street, Suite 590

San Jose, CA 95131

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

Toronto

Microchip Technology Inc.

5925 Airport Road, Suite 200

Mississauga, Ontario L4V 1W1, Canada

Tel: 905-405-6279 Fax: 905-405-6253

M

Printed on recycled paper.

Information contained in this publication regarding device applications and the like is intended for suggestion only and may be superseded by updates. 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 components in life support systems is not authorized except with express

written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.The Microchip logo and name are registered trademarks

DS40152C-page 24

Preliminary

1997 Microchip Technology Inc.


型号：	HCS360
厂家：	MICROCHIP
描述：	KEELOQ CODE HOPPING ENCODER KEELOQ跳码编码器编码器
文件：	总24页 (文件大小：201K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HCS360 [MICROCHIP]

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