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PDF HCS360-SN Data sheet ( Hoja de datos )
| Número de pieza | HCS360-SN | |
| Descripción | KEELOQ CODE HOPPING ENCODER | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HCS360-SN (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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M
HCS360
Code Hopping Encoder
FEATURES
Security
• 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
Operating
• 2.0-6.6V operation
• Four button inputs
- 15 functions available
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
• Nonvolatile synchronization data
• PWM and Manchester modulation
Other
• Easy to use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Current limiting on LED output
• Minimum component count
Enhanced Features Over HCS300
• 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
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
• Burglar alarm systems
PACKAGE TYPES
PDIP, SOIC
S0
1
S1 2
S2 3
S3 4
8 VDD
7 LED
6 PWM
5 VSS
HCS360 BLOCK DIAGRAM
Oscillator
LED
Reset circuit
LED driver
Controller
Power
latching
and
switching
PWM
EEPROM
Encoder
32-bit shift register
VSS
VDD
Button input port
S3 S2 S1 S0
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.
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.
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
1 page  
FIGURE 2-2:
ENCODER OPERATION
Power Up
(A button has been pressed)
Reset and Debounce Delay
(6.5 ms)
Sample Inputs
Update Sync Info
Encrypt With
Encryption Key
Load Transmit Register
Transmit
Yes Buttons
Added
?
No
All
Buttons
Released
?
No
Yes
Complete Code
Word Transmission
Stop
HCS360
3.0 EEPROM MEMORY
ORGANIZATION
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.
TABLE 3-1 EEPROM MEMORY MAP
WORD
ADDRESS
MNEMONIC
DESCRIPTION
0
KEY_0
64-bit encryption
key (word 0)
1
KEY_1
64-bit encryption
key (word 1)
2
KEY_2
64-bit encryption
key (word 2)
3
KEY_3
64-bit encryption
key (word 3)
4
SYNC_A
16-bit synchroniza-
tion value
5 SYNC_B/SEED_2 16-bit synchroniza-
tion or seed value
(word 2)
6 RESERVED Set to 0000H
7
SEED_0
Seed Value (word 0)
8
SEED_1
Seed Value (word 1)
7
SER_0
Device Serial
Number (word 0)
10
SER_1
Device Serial
Number (word 1)
11
CONFIG
Configuration Word
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
5 Page 
HCS360
FIGURE 4-1: TRANSMISSION FORMAT—MANCH = 0
TOTAL TRANSMISSION:
1 CODE WORD
Preamble Sync Encrypt Fixed
Guard Preamble Sync Encrypt
CODE WORD:
LOGIC "0"
LOGIC "1"
TE
12 45 6
16
13579
13 14 15 2 4 6 8 10
TE
BIT
Preamble
Sync
Code Word
Encrypted
TX Data
Fixed Code
Data
Guard
Time
FIGURE 4-2: TRANSMISSION FORMAT—MANCH = 1
TOTAL TRANSMISSION:
1 CODE WORD
Preamble Sync Encrypt Fixed
Guard Preamble Sync Encrypt
CODE WORD:
LOGIC "0"
LOGIC "1"
TE
BPW
12 456
Start bit
16
13
13 14 15 2 4
Stop bit
Preamble
Sync
Encrypted
Data
CODE WORD
Fixed Code
Data
Guard
Time
FIGURE 4-3:
CRC
(2 bit)
CODE WORD ORGANIZATION (RIGHT-MOST BIT IS CLOCKED OUT FIRST)
Fixed Code Data
Encrypted Code Data
VLOW
(1 bit)
Button
Status
(4 bits)
28-bit
Serial Number
Button
Status
(4 bits)
Discrimination
bits
(12 bits)
16-bit
Synch Value
CRC VLOW
(2 bit) bit
+
Serial Number and
Button Status (32 bits)
MSB
LSB
67 bits
+ 32 bits of Encrypted Data of Data
Transmitted
© 1996 Microchip Technology Inc.
Preliminary
DS40152C-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet HCS360-SN.PDF ] | |
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