鈥?/div>
Automotive remote entry systems
Automotive alarm systems
Automotive immobilizers
Gate and garage openers
Electronic door locks
Identity tokens
Burglar alarm systems
EEPROM
CONTROL
DECRYPTOR
DATA
CLK
LRNIN
SEL
MCLR
SLEEP
CONTROL
S3
V
LOW
LRNOUT
OSCIN OSCILLATOR
OUTPUT
S0
S1
S2
Compatible Encoders
鈥?HCS200, HCS300, HCS301, HCS360, HCS361
鈥?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 K
EE
L
OQ
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.
The Manufacturer鈥檚 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鈥檚 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.
K
EELOQ
is a registered trademark of Microchip Technology, Inc.
Microchip鈥檚 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. 鈥?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. 鈥?U.S.A.: 5,686,904; R.S.A.: 95/5429
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2001 Microchip Technology Inc.
DS40151C-page 1
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