HCS360/SN_技术文档

HCS360

®

KEELOQ Code Hopping Encoder

FEATURES

Security

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 sys-

tems and access control systems.

• 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

PACKAGE TYPES

PDIP, SOIC

8

7

6

5

VDD

LED

DATA

VSS

Operating

• 2.0-6.6V operation

• Four button inputs

- 15 functions available

S0

1

2

3

4

S1

S2

S3

• Selectable baud rate

• Automatic code word completion

• Battery low signal transmitted to receiver

• Nonvolatile synchronization data

• PWM and Manchester modulation

BLOCK DIAGRAM

Other

Oscillator

Power

latching

and

• Easy-to-use programming interface

• On-chip EEPROM

Controller

RESET circuit

switching

LED

• On-chip oscillator and timing components

• Button inputs have internal pull-down resistors

• Current limiting on LED output

• Minimum component count

LED driver

EEPROM

Encoder

Enhanced Features Over HCS300

DATA

• 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

32-bit shift register

VSS

Button input port

VDD

Typical Applications

S₂

S₃

S₁S₀

The HCS360 is ideal for Remote Keyless Entry (RKE)

applications. These applications include:

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.

• Automotive RKE systems

• Automotive alarm systems

• Automotive immobilizers

• Gate and garage door openers

• Identity tokens

• Burglar alarm systems

2002 Microchip Technology Inc.

DS40152E-page 1

HCS360

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 HCS360 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 3-1).

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 3-1).

• 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 HCS360 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 HCS360 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 HCS360, 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 HCS360 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

DS40152E-page 2

2002 Microchip Technology Inc.

HCS360

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

HCS360 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

HCS360

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 4.2.

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 HCS360 based transmitter. Section 7.0

provides detail on integrating the HCS360 into a sys-

tem.

2002 Microchip Technology Inc.

DS40152E-page 3

HCS360

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.

DS40152E-page 4

2002 Microchip Technology Inc.

HCS360

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

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

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.

B0

B1

S0

VDD

LED

S1

S2

S3

Tx out

DATA

VSS

FIGURE 2-2:

ENCODER OPERATION

Two button remote control

Power-Up

(A button has been pressed)

VDD

B4 B3 B2 B1 B0

RESET and Debounce Delay

(10 ms)

S0

Sample Inputs

VDD

LED

DATA

VSS

S1

S2

S3

Update Sync Info

Tx out

Encrypt With

Crypt Key

Five button remote control (Note¹)

Load Transmit Register

Transmit

Note:

Up to 15 functions can be implemented by pressing

more than one button simultaneously or by using a

suitable diode array.

TABLE 2-1:

PIN DESCRIPTIONS

Description

Buttons

Added

?

Yes

Number

Name

No

S0

S1

S2

1

Switch input 0

Switch input 1

All

Buttons

Released

?

2

3

Switch input 2 / Clock pin when in

Programming mode

Yes

Complete Code

Word Transmission

S3

VSS

4

5

6

Switch input 3

Ground reference

DATA

Data output pin /Data I/O pin for

Programming mode

Stop

LED

VDD

7

8

Cathode connection for LED

Positive supply voltage

The HCS360 will wake-up upon detecting a button

press and delay approximately 10 ms for button

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

2002 Microchip Technology Inc.

DS40152E-page 5

HCS360

3.2

SYNC_A, SYNC_B

(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 is

incremented after every transmission. Separate syn-

chronization counters can be used to stay synchro-

nized with different receivers.

The HCS360 contains 192 bits (12 x 16-bit words) of

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

used to store the crypt key information, synchronization

value, etc. Further descriptions of the memory array is

given in the following sections.

3.3

SEED_0, SEED_1, and SEED_2

(Seed Word)

TABLE 3-1:

EEPROM MEMORY MAP

MNEMONIC DESCRIPTION

64-bit crypt key

WORD

ADDRESS

The three word (48 bits) seed code will be transmitted

when seed transmission is selected. This allows the sys-

tem designer to implement the Secure Learn feature or

use this fixed code word as part of a different key genera-

tion/tracking process or purely as a fixed code transmis-

sion.

0

1

2

3

KEY_0

KEY_1

KEY_2

KEY_3

SYNC_A

(word 0) LSb’s

64-bit crypt key

(word 1)

64-bit crypt key

(word 2)

64-bit crypt key

(word 3) MSb’s

16-bit synch counter

Note: Since SEED2 and SYNC_B share the

same memory location, Secure Learn and

Independent mode transmission (including

IR mode) are mutually exclusive.

4

5

SYNC_B/ 16-bit synch counter B

SEED_2 or Seed value (word 2)

RESERVED Set to 0000H

3.4

SER_0, SER_1

(Encoder Serial Number)

6

7

SEED_0

SEED_1

SER_0

Seed Value

(word 0) LSb’s

Seed Value

(word 1) MSb’s

Device Serial Number

(word 0) LSb’s

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

configuration bit determines whether 32 or 28 bits will

be transmitted. The serial number is meant to be

unique for every transmitter.

8

9

10

11

SER_1

Device Serial Number

(word 1) MSb’s

Configuration Word

CONFIG

3.1

KEY_0 - KEY_3 (64-Bit Crypt Key)

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

message transmitted to the receiver. This key is calcu-

lated and programmed during production using a key

generation algorithm. The key generation algorithm

may be different from the KEELOQ algorithm. Inputs to

the key generation algorithm are typically the transmit-

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

While the key generation algorithm supplied from

Microchip is the typical method used, a user may elect

to create their own method of key generation. This may

be done providing that the decoder is programmed with

the same means of creating the key for

decryption purposes.

DS40152E-page 6

2002 Microchip Technology Inc.

HCS360

BSEL 1 and BSEL 0 determine the baud rate according

to Table 3-4 when Manchester modulation is selected.

3.5

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. Further

explanations of each of the bits are described in the

following sections.

TABLE 3-4:

BAUD RATE SELECTION

MOD

BSEL 1 BSEL 0

TE

Unit

1

0

1

0

1

0

1

800

400

200

us

TABLE 3-2:

CONFIGURATION WORD.

3.5.3

OVR: OVERFLOW

Bit Number Symbol

Bit Description

0

1

LNGRD Long Guard Time

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 auto-

matically clear OVR the first time that the transmitted

synchronization 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 old encoder devices.

BSEL 0 Baud Rate Selection

BSEL 1 Baud Rate Selection

2

3

NU

Not Used

4

SEED

DELM

TIMO

IND

Seed Transmission enable

Delay mode enable

Time-out enable

5

6

7

Independent mode enable

8

USRA0 User bit

USRA1 User bit

USRB0 User bit

USRB1 User bit

9

10

11

12

XSER

Extended serial number

enable

13

14

15

TMPSD Temporary seed transmis-

sion enable

MOD

Manchester/PWM modula-

tion selection

3.5.4

LNGRD: LONG GUARD TIME

LNGRD = 1 selects the encoder to extend the guard

time between code words adding ≈50 ms. This can be

used to reduce the average power transmitted over a

100 ms window and thereby transmit a higher peak

power.

OVR

Overflow bit

3.5.1

MOD: MODULATION FORMAT

MOD selects between Manchester code modulation

and PWM modulation.

If MOD = 1, Manchester modulation is selected:

If MOD = 0, PWM modulation is selected.

3.5.2

BSEL 1, 0

BAUD RATE SELECTION

BSEL 1 and BSEL 0 determine the baud rate according

to Table 3-3 when PWM modulation is selected.

TABLE 3-3:

BAUD RATE SELECTION

MOD

BSEL 1 BSEL 0

TE

Unit

0

1

0

1

0

1

400

200

100

us

2002 Microchip Technology Inc.

DS40152E-page 7

HCS360

3.5.5

XSER: EXTENDED SERIAL

NUMBER

3.5.6

DISCRIMINATION VALUE

While in other KEELOQ encoders its value is user

selectable, the HCS360 uses directly the 8 Least Sig-

nificant bits of the Serial Number as part of the infor-

mation that form the encrypted portion of the

transmission (Figure 3-1).

If XSER = 0, the four Most Significant bits of the Serial

Number are substituted by S[3:0] and the code word

format is compatible with the HCS200/300/301.

If XSER = 1, the full 32-bit Serial Number [SER_1,

SER_0] is transmitted.

The discrimination value aids the post-decryption

check on the decoder end. After the receiver has

decrypted a transmission, the discrimination bits are

checked against the encoder Serial Number to verify

that the decryption process was valid.

Note: Since the button status S[3:0] is used to

detect a Seed transmission, Extended

Serial Number and Secure Learn are

mutually exclusive.

3.5.7

USRA,B: USER BITS

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.

FIGURE 3-1:

CODE WORD ORGANIZATION

XSER=0

Fixed Code Portion of Transmission

Encrypted Portion of Transmission

Discrimination

bits

Button

Status

(4 bits)

Button

Status

(4 bits)

CRC

(2-bit)

VLOW

(1-bit)

28-bit

Serial Number

16-bit

Sync Value

(12 bits)

MSB

LSB

67 bits

of Data

Transmitted

XSER=1

Fixed Code Portion of Transmission

Encrypted Portion of Transmission

Discrimination

bits

Button

Status

(4 bits)

CRC

(2-bit)

VLOW

32-bit

(1-bit)

16-bit

Sync Value

Extended Serial Number

(12 bits)

MSB

LSB

Button Status

(4 bits)

Discrimination Bits

(12 bits)

S

2

S

1

S

0

S

3

I

O

U

S

R

1

U

S

R

0

S

E

R

7

S

E

R

6

...

S

E

R

0

N

D

V

R

DS40152E-page 8

2002 Microchip Technology Inc.

HCS360

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.

3.5.8

SEED: ENABLE SEED

TRANSMISSION

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 3-9) 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 3-2.

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 3-2:

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.

3.5.9

TMPSD: TEMPORARY SEED

TRANSMISSION

TABLE 3-5:

SYNCHRONOUS COUNTER

INITIALIZATION VALUES

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 transmis-

sions. The number of transmissions before seed trans-

mission is disabled, can be programmed by setting the

synchronization counter (SYNC_A, SYNC_B) to a

value as shown in Table 3-5.

Synchronous Counter

Values

Number of

Transmissions

0000H

0060H

0050H

0048H

128

64

32

16

2002 Microchip Technology Inc.

DS40152E-page 9

HCS360

If DELM = 0, delay transmission is disabled (Table 3-

6).

3.5.10

DELM: DELAY MODE

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 and is

not recommended for new designs.

TABLE 3-6:

BSEL 1

TYPICAL DELAY TIMES

Number of Code

Time Before Delay Mode Time Before Delay Mode

BSEL 0

Words before Delay

Mode

(MOD = 0)

(MOD = 1)

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

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 3-7).

3.5.11

TIMO: TIME-OUT

OR AUTO-SHUTOFF

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

TABLE 3-7:

BSEL 1

TYPICAL TIME-OUT TIMES

Maximum Number of

Time Before Time-out

(MOD = 0)

Time Before Time-out

(MOD = 1)

BSEL 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

DS40152E-page 10

2002 Microchip Technology Inc.

HCS360

3.5.12

IND: INDEPENDENT MODE

TABLE 3-8:

IR MODULATION

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 3-9, function codes 1 to 7

use SYNC_A and 8 to 15 SYNC_B.

TE

Basic Pulse

(800µs)

(32x)

800us

400us

3.5.13

INFRARED MODE

(400µs)

(16x)

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

(see Table 3-8). It must be pointed out that 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, Inde-

pendent mode is enabled and counters for functions

are used according to Table 3-9.

Period = 25µs

200us

100us

(200µs)

(8x)

(100µs)

(4x)

TABLE 3-9:

S3

FUNCTION CODES

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

A

B

3

If SEED = 1, transmit seed after delay.

4

5

6

7

8

9

If SEED = 1, transmit seed immediately.

10

11

12

B⁽¹⁾

13

14

15

1

0

1

0

1

A

Note 1: IR mode

2002 Microchip Technology Inc.

DS40152E-page 11

HCS360

4.2

Code Word Organization

4.0

4.1

TRANSMITTED WORD

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 3-1).

Transmission Format (PWM)

The HCS360 code word is made up of several parts

(Figure 4-1 and Figure 4-2). Each code word contains

a 50% duty cycle preamble, a header, 32 bits of

encrypted data and 35 bits of fixed data followed by a

guard period before another code word can begin.

Refer to Table 8-3 and Table 8-5 for code word timing.

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 3-1). The encrypted portion alone provides up

to four billion changing code combinations.

The Fixed 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 func-

tion code bits will not be transmitted. The fixed and

encrypted sections combined increase the number of

code combinations to 7.38 x 10¹⁹

FIGURE 4-1: CODE WORD FORMAT (PWM)

TE

LOGIC "0"

LOGIC "1"

50% Duty Cycle

Preamble

1

16

31XTE Preamble

Encrypted Portion

of Transmission

Fixed Portion

of Transmission

Guard

Time

10xTE

Header

FIGURE 4-2: CODE WORD FORMAT (MANCHESTER)

TE

LOGIC "0"

LOGIC "1"

50% Duty Cycle

STOP bit

START bit bit 0

16

bit 2

Preamble

bit 1

1

2

Guard

Time

31XTE

Preamble

Encrypted Portion

of Transmission

Fixed Portion

of Transmission

4XTE

Header

DS40152E-page 12

2002 Microchip Technology Inc.

HCS360

5.3

CRC (Cycle Redundancy Check)

Bits

5.0

5.1

SPECIAL FEATURES

Code Word Completion

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:

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

EQUATION 5-1:

CRC Calculation

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

result. If another button is activated during

a

and

with

transmission, the active transmission will be aborted

and the new code will be generated using the new

button information.

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

5.2

Long Guard Time

CRC[1, 0]₀= 0

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 100

ms 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 or by extending the guard time between transmis-

sions. Long guard time (LNGRD) is used for reducing

the average power of a transmission. This is a select-

able feature. Using the LNGRD allows the user to

and

Di_nthe nth transmission bit 0 ≤ n ≤ 64

Note: The CRC may be wrong when the battery

voltage is around either of the VLOW trip

points. This may happen because VLOW is

sampled twice each transmission, once for

the CRC calculation (PWM is low) and once

when VLOW is transmitted (PWM is high).

VDD tends to move slightly during a transmis-

sion which could lead to a different value for

VLOW being used for the CRC calculation

and the transmission

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.

.

Work around: If the CRC calculation is incor-

rect, recalculate for the opposite value of

VLOW.

2002 Microchip Technology Inc.

DS40152E-page 13

HCS360

FIGURE 5-1:

VLOW Trip Point VS.

Temperature

5.4

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 time-out bit

(Section 3.5.11). Setting this bit will enable the function

(turn Auto-shutoff function on) and clearing the bit will

disable the function. Time-out period is approximately

25 seconds.

4.5

VLOW=0

Nominal Trip Point

3.8V

4

3.5

3

3.5

2V

VLOW=1

VLOW=0

2.5

2

Nominal Trip

Point

5.5

VLOW: Voltage LOW Indicator

1.5

The VLOW bit is transmitted with every transmission

(Figure 3-1) and will be transmitted as a one if the

operating voltage has dropped below the low voltage

trip point, typically 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.

25

85

-40

If the supply voltage drops below the low voltage trip

point, the LED output will be toggled at approximately

1Hz during the transmission.

5.6

LED Output Operation

TABLE 5-1:

VLOW AND LED VS. VDD

During normal transmission the LED output is LOW

while the data is being transmitted and high during the

guard time. Two voltage indications are combined into

one bit: VLOW. Table 5-1 indicates the operation value

of VLOW while data is being transmitted.

Approximate

Supply Voltage

VLOW Bit

LED Operation*

Max → 3.8V

3.8V → 2.2V

2.2V → Min

0

1

0

Normal

Flashing

Normal

*See also FLASH operating modes.

DS40152E-page 14

2002 Microchip Technology Inc.

HCS360

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 loaded, a programming

delay is required for the internal program cycle to com-

plete. The Acknowledge can read back after the pro-

gramming 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 6-1) 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 possi-

ble to execute a Verify function without first program-

ming the EEPROM. A Verify operation can only be

done once, immediately following the Program

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 inter-

nally 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 should

be held low during the entire program cycle. The S1

line on the HCS360 part needs to be set or cleared

depending on the LS bit of the memory map (Key 0)

before the key is clocked in to the HCS360. S1 must

remain at this level for the duration of the programming

cycle. The device can then be programmed by clocking

FIGURE 6-1:

Programming Waveforms

Enter Program

Acknowledge Pulse

Mode

TWC

DATA

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)

TCLKH

TCLKL

TDH

T₂

S2/S3

(Clock)

T₁

TDS

Bit 0 of Word0

S1

Data for Word 1

Data for Word 0 (KEY_0)

Repeat for each word

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

The VDD pin must be taken to ground after a program/verify cycle.

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

FIGURE 6-2:

Verify Waveforms

End of Programming Cycle

Beginning of Verify Cycle

Data from Word0

DATA

(Data)

Bit190 Bit191

Bit 0

Bit 1 Bit 2 Bit 3

Bit 14

Bit 15

Bit 16 Bit 17

Bit190 Bit191

Ack

TWC

TDV

S2/S3

(Clock)

S1

Note: A Verify sequence is performed only once immediately after the Program cycle.

2002 Microchip Technology Inc.

DS40152E-page 15

HCS360

TABLE 6-3:

PROGRAMMING/VERIFY TIMING REQUIREMENTS

VDD = 5.0V ± 10%

25° C ± 5 °C

Parameter

Symbol

Min.

Max.

Units

Program mode setup time

Hold time 1

T₂

T₁

0

4.0

ms

9.0

—

ms

Program cycle time

Clock low time

TWC

TCLKL

TCLKH

TDS

50

0

—

ms

µs

µs⁽¹⁾

Clock high time

Data setup time

Data hold time

TDH

TDV

30

—

Data out valid time

30

Note 1: Typical values - not tested in production.

DS40152E-page 16

2002 Microchip Technology Inc.

HCS360

FIGURE 7-1:

TYPICAL LEARN

SEQUENCE

7.0

INTEGRATING THE HCS360

INTO A SYSTEM

Enter Learn

Use of the HCS360 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 HCS360 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.

2002 Microchip Technology Inc.

DS40152E-page 17

HCS360

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

DS40152E-page 18

2002 Microchip Technology Inc.

HCS360

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)

2002 Microchip Technology Inc.

DS40152E-page 19

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

TSTG

TLSOL

VESD

Output voltage

V

mA

Max output current

Storage temperature

Lead soldering temp

ESD rating

-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

1

Parameter

Sym.

Min

Max

Min

Max

Unit

Conditions

Typ

Operating

(avg)

current

ICC

0.3

1.2

mA

VDD = 3.3V

VDD = 6.6V

0.7

0.1

160

1.6

1.0

Standby current

Auto-shutoff

ICCS

0.1

40

1.0

75

µA

350

2,3

current

High level input

voltage

VIH

VIL

0.55 VDD

-0.3

VDD+0.3 0.55VDD

VDD+0.3

0.15VDD

V

Low level input

voltage

0.15 VDD

-0.3

High level output VOH

voltage

0.7 VDD

0.7VDD

IOH = -1.0 mA, VDD = 2.0V

IOH = -2.0 mA, VDD = 6.6V

Low level output

voltage

VOL

0.08 VDD

0.08VDD

IOL = 1.0 mA, VDD = 2.0V

IOL = 2.0 mA, VDD = 6.6V

4

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

Pull-Down

RS0-3

kΩ

VDD = 4.0V

Resistance; S0-S3

Pull-Down

RPWM

80

120

160

80

120

160

kΩ

VDD = 4.0V

Resistance; DATA

Note 1: Typical values are at 25°C.

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

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

4: VLED is the voltage between the VDD pin and the LED pin.

DS40152E-page 20

2002 Microchip Technology Inc.

HCS360

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

FIGURE 8-2:

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

(Note 1)

Time to second button press

TBP

10 + Code 26 + Code

Word Time Word Time

ms

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 time-out period is not tested.

2002 Microchip Technology Inc.

DS40152E-page 21

HCS360

FIGURE 8-3: PWM FORMAT SUMMARY (MOD=0)

TE

LOGIC "0"

LOGIC "1"

50% Duty Cycle

Preamble

T

BP

1

16

10xTE

Header

31XTE Preamble

Encrypted Portion

of Transmission

Fixed Portion

of Transmission

Guard

Time

FIGURE 8-4:

PWM PREAMBLE/HEADER FORMAT (MOD=0)

P1

P16

Bit 0 Bit 1

Data Bits

31xTE 50% Duty Cycle Preamble

10 TE Header

FIGURE 8-5:

PWM DATA FORMAT (MOD=0)

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 Portion of Transmission

Encrypted Portion

of Transmission

Header

DS40152E-page 22

2002 Microchip Technology Inc.

HCS360

FIGURE 8-6: MANCHESTER FORMAT SUMMARY (MOD=1)

TPB

TE

LOGIC "0"

LOGIC "1"

50% Duty Cycle

STOP bit

START bit bit 0

16

bit 2

Preamble

bit 1

1

2

Guard

Time

31XTE

Preamble

Encrypted Portion

of Transmission

Fixed Portion

of Transmission

4XTE

Header

FIGURE 8-7:

MANCHESTER PREAMBLE/HEADER FORMAT (MOD=1)

50% Duty Cycle

Preamble

P1

P16

Bit 0 Bit 1

Data Word

Transmission

4 x TE

Header

31 x TE Preamble

FIGURE 8-8:

HCS360 NORMALIZED TE VS. TEMP

1.7

Typical

1.6

TE Max.

1.5

1.4

1.3

VDD LEGEND

= 2.0V

1.2

TE

= 3.0V

= 6.0V

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

2002 Microchip Technology Inc.

DS40152E-page 23

HCS360

TABLE 8-3:

CODE WORD TRANSMISSION TIMING PARAMETERS—PWM MODE

VDD = +2.0V to 6.6V

Code Words Transmitted

Commercial (C):Tamb = 0°C to +70°C

Industrial (I):Tamb = -40°C to +85°C

BSEL1 = 0

BSEL0 = 0

BSEL1 = 0

BSEL0 = 1

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

TE

TBP

TP

Basic pulse element

PWM bit pulse width

Preamble duration

Header duration

260

400

3

620

130

200

3

310

µs

TE

31

TE

TH

10

TE

THOP

TFIX

TG

Hopping code duration

Fixed code duration

Guard Time (LNGRD = 0)

Total transmit time

PWM data rate

96

TE

105

17

105

33

TE

—

259

103.6

833

275

55.0

1667

TE

—

67.3

160.6

538

35.8

85.3

ms

bps

—

1282

2564

1075

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

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

BSEL1 = 1,

BSEL0 = 0

BSEL0 = 1

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

TE

TBP

TP

Basic pulse element

PWM bit pulse width

Preamble duration

Header duration

130

200

3

310

65

100

3

155

µs

TE

31

TE

TH

10

TE

THOP

TFIX

TG

Hopping code duration

Fixed code duration

Guard Time (LNGRD = 0)

Total transmit time

PWM data rate

96

TE

105

33

105

65

TE

—

275

55.0

1667

307

30.7

3333

TE

—

35.8

85.3

20.0

47.6

ms

bps

—

2564

1075

5128

2151

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

DS40152E-page 24

2002 Microchip Technology Inc.

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

BSEL1 = 0.

BSEL1 = 0,

BSEL0 = 0

BSEL0 = 1

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

TE

TP

TH

Basic pulse element

Preamble duration

Header duration

520

800

31

1240

260

400

31

620

µs

TE

4

TE

TSTART START bit

2

TE

THOP

TFIX

Hopping code duration

Fixed code duration

64

TE

70

TE

TSTOP STOP bit

2

TE

TG

—

Guard Time (LNGRD = 0)

9

17

TE

Total transmit time

Manchester data rate

182

145.6

1250

190

76.0

2500

TE

94.6

223.7

806

49.4

117.8

ms

bps

1923

3846.2

1612.9

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

TABLE 8-6: 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

BSEL1 = 1.

BSEL1 = 1,

BSEL0 = 0

BSEL0 = 1

Symbol

Characteristic

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

TE

TP

Basic pulse element

Preamble duration

Header duration

260

400

32

620

130

200

32

310

µs

TE

TH

4

TSTART

THOP

TFIX

TSTOP

TG

START bit

2

Hopping code duration

Fixed code duration

STOP bit

64

70

2

Guard Time (LNGRD = 0)

Total transmit time

Manchester data rate

16

32

—

190

76.0

2500.0

206

41.2

5000.0

TE

ms

bps

—

49.4

117.8

26.8

63.4

—

3846.2

1612.9

7692.3

3225.8

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

2002 Microchip Technology Inc.

DS40152E-page 25

HCS360

9.0

9.1

PACKAGING INFORMATION

Package Marking Information

8-Lead PDIP (300 mil)

Example

HCS360

XXXXXXXX

XXXXXNNN

YYWW

0025

8-Lead SOIC (150 mil)

Example

XXXXXXX

HCS360

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.

DS40152E-page 26

2002 Microchip Technology Inc.

HCS360

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

2002 Microchip Technology Inc.

DS40152E-page 27

HCS360

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

Molded Package Thickness

Standoff

A2

A1

E

.052

.004

.228

.146

.189

.010

.019

0

.061

.010

.244

.157

.197

.020

.030

8

1.55

0.25

6.20

3.99

5.00

0.51

0.76

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

DS40152E-page 28

2002 Microchip Technology Inc.

HCS360

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

2002 Microchip Technology Inc.

DS40152E-page 29

HCS360

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:

DS40152E

Device:

HCS360

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?

DS40152E-page 30

2002 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

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.

2002 Microchip Technology Inc.

DS40152E-page 31

HCS360

NOTES:

DS40152E-page 32

2002 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.

2002 Microchip Technology Inc.

DS40152E - page 33

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

Unit 28F, World Trade Plaza

No. 71 Wusi Road

Fuzhou 350001, China

Tel: 86-591-7503506 Fax: 86-591-7503521

China - Shanghai

Microchip Technology Consulting (Shanghai)

Co., Ltd.

Room 701, Bldg. B

Far East International Plaza

No. 317 Xian Xia Road

Shanghai, 200051

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

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

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

EUROPE

Denmark

Microchip Technology Nordic ApS

Regus Business Centre

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Tel: 45 4420 9895 Fax: 45 4420 9910

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Tri-Atria Office Building

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

Kokomo

France

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

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18201 Von Karman, Suite 1090

Irvine, CA 92612

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

Germany

New York

150 Motor Parkway, Suite 202

Hauppauge, NY 11788

Microchip Technology GmbH

Gustav-Heinemann Ring 125

D-81739 Munich, Germany

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

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

San Jose

Hong Kong

Italy

Microchip Technology Inc.

2107 North First Street, Suite 590

San Jose, CA 95131

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

Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

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

Toronto

Milan, Italy

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

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

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

India

Microchip Technology Inc.

India Liaison Office

United Kingdom

Arizona Microchip Technology Ltd.

505 Eskdale Road

Winnersh Triangle

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Divyasree Chambers

1 Floor, Wing A (A3/A4)

No. 11, O’Shaugnessey Road

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

Berkshire, England RG41 5TU

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

01/18/02

DS40152E-page 34

2002 Microchip Technology Inc.


型号：	HCS360/SN
厂家：	ETC
描述：	REMOTE-CONTROL TRANSMITTER/ENCODER\|CMOS\|SOP\|8PIN 遥控发射器/编码器\| CMOS \|专科\| 8PIN\n 电信集成电路遥控光电二极管编码器
文件：	总34页 (文件大小：442K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HCS360/SN [ETC]

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