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HCS512 Datasheet

  • HCS512

  • KEELOQ® Code Hopping Decoder

  • 26頁

  • Microchip   Microchip

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M
FEATURES
Security
鈥?/div>
鈥?/div>
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Secure storage of Manufacturer鈥檚 Code
Secure storage of transmitter鈥檚 keys
Up to four transmitters can be learned
K
EE
L
OQ
code hopping technology
Normal and secure learning mechanisms
PDIP, SOIC
LRNIN
LRNOUT
NC
MCLR
GND
S0
S1
S2
S3
1
2
3
4
5
6
7
8
9
HCS512
Code Hopping Decoder
PACKAGE TYPE
18
17
16
15
14
13
12
11
10
HCS512
RFIN
NC
OSCIN
OSC
OUT
V
DD
DATA
CLK
SLEEP
V
LOW
Operating
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3.0V 鈥?6.0V operation
4 MHz RC oscillator
Learning indication on LRNOUT
Auto baud rate detection
Power saving sleep mode
Other
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Stand alone decoder
On-chip EEPROM for transmitter storage
Four binary function outputs鈥?5 functions
18-pin DIP/SOIC package
BLOCK DIAGRAM
RFIN
67-Bit Reception Register
Typical Applications
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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.
漏
1997 Microchip Technology Inc.
DS40151C-page 1

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