HCS512 Datasheet, PDF (1/20 Pages) Microchip Technology – KEELOQ CODE HOPPING DECODER

M
HCS512
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
• 3.0V – 6.0V operation
• 4 MHz 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
• HCS200, HCS300, HCS301, HCS360, HCS361
• NTQ106
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
67-Bit Reception Register
EEPROM
CONTROL
OSCIN OSCILLATOR
DECRYPTOR
DATA
CLK
LRNIN
SEL
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.
The HCS512 operates over a wide voltage range of
3.0 volts to 6.0 volts. The decoder employs automatic
baud rate detection which allows it to compensate for
wide variations in transmitter data rate. The decoder
contains sophisticated error checking algorithms to
ensure only valid codes are accepted.
© 1997 Microchip Technology Inc.
DS40151C-page 1