HCS512_11 Datasheet, PDF (1/34 Pages) Microchip Technology – KEELOQ® Code Hopping Decoder system and high security

HCS512
KEELOQ® Code Hopping Decoder
FEATURES
Security
• Secure storage of Manufacturer’s Code
• Secure storage of transmitter’s keys
• Up to four transmitters can be learned
• KEELOQ^® code hopping technology
• Normal and secure learning mechanisms
Operating
• 4.0V – 6.0V operation
• 4 MHz external RC oscillator
• Learning indication on LRNOUT
• Auto baud rate detection
• Power saving SLEEP mode
Other
• Stand-alone decoder
• On-chip EEPROM for transmitter storage
• Four binary function outputs–15 functions
• 18-pin DIP/SOIC package
Typical Applications
• Automotive remote entry systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage openers
• Electronic door locks
• Identity tokens
• Burglar alarm systems
Compatible Encoders
All KEELOQ encoders and transponders configured for
the following setting:
• PWM modulation format (1/3-2/3)
• TE in the range from 100 μs to 400 μs
• 10 x TE Header
• 28-bit Serial Number
• 16-bit Synchronization counter
• Discrimination bits equal to Serial Number 8 LSbs
• 66- to 69-bit length code word.
DESCRIPTION
The Microchip Technology Inc. HCS512 is a code hop-
ping decoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS512 utilizes the pat-
ented KEELOQ code hopping system and high security
learning mechanisms to make this a canned solution
when used with the HCS encoders to implement a uni-
directional remote keyless entry system.
PACKAGE TYPE
PDIP, SOIC
LRNIN 1
LRNOUT 2
NC 3
MCLR 4
GND 5
S0 6
S1 7
S2 8
S3 9
18 RFIN
17 NC
16 OSCIN
15 OSCOUT
14 VDD
13 DATA
12 CLK
11 SLEEP
10 VLOW
BLOCK DIAGRAM
RFIN
Reception Register
EEPROM
CONTROL
OSCIN OSCILLATOR
DECRYPTOR
DATA
CLK
LRNIN
MCLR
SLEEP
OUTPUT
CONTROL
S0 S1 S2 S3 VLOW LRNOUT
The Manufacturer’s Code, transmitter keys, and syn-
chronization information are stored in protected on-
chip EEPROM. The HCS512 uses the DATA and CLK
inputs to load the Manufacturer’s Code which cannot
be read out of the device.
© 2011 Microchip Technology Inc.
DS40151E-page 1