HCS361 Datasheet PDF - Microchip Technology
| Part Number | HCS361 | |
| Description | KEELOQ CODE HOPPING ENCODER | |
| Manufacturers | Microchip Technology | |
| Logo |  |
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M
HCS361
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 VPWM modulation
Other
• Easy to use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pulldown 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 VPWM modulation
• Wake-up signal in VPWM mode
• IR modulation mode
Typical Applications
The HCS361 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
HCS361 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 HCS361 is a code hopping encoder designed for
secure Remote Keyless Entry (RKE) systems. The
HCS361 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 HCS361 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 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
DS40146C-page 1
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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
HCS361
3.0 EEPROM MEMORY
ORGANIZATION
The HCS361 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
1 KEY_1
2 KEY_2
64-bit encryption
key (word 0)
64-bit encryption
key (word 1)
64-bit encryption
key (word 2)
3 KEY_3
64-bit encryption
key (word 3)
4 SYNC_A
16-bit synchroni-
zation value
5 SYNC_B/SEED_2 16-bit synchroni-
zation or seed
value (word 2)
6 RESERVED
7 SEED_0
Set to 0000H
Seed Value
(word 0)
8 SEED_1
7 SER_0
10 SER_1
11 CONFIG
Seed Value
(word 1)
Device Serial
Number (word 0)
Device Serial
Number (word 1)
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
DS40146C-page 5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for HCS361 electronic component. |
| Information | Total 24 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ HCS361.PDF Datasheet ] | |
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