HCS515
KEELOQ® Code Hopping Decoder
FEATURES
Security
DESCRIPTION
The Microchip Technology Inc. HCS515 is a code hop-
ping decoder designed for secure Remote Keyless
Entry (RKE) systems. The HCS515 utilizes the pat-
ented code hopping system and high security learning
mechanisms to make this a canned solution when used
with the HCS encoders to implement a unidirectional
remote and access control systems. The HCS515 can
be used as a stand-alone decoder or in conjunction
with a microcontroller.
• Encrypted storage of manufacturer’s code
• Encrypted storage of encoder decryption keys
• Up to seven transmitters can be learned code
hopping technology
• Normal and secure learning mechanisms
Operating
PACKAGE TYPE
• 4.5V – 5.5V operation
• Internal oscillator
PDIP, SOIC
• Auto bit rate detection
NC
NC
VDD
S1
1
2
3
4
5
14 NC
13 NC
12 Vss
Other
• Stand-alone decoder
• Internal EEPROM for transmitter storage
• Synchronous serial interface
• 1 Kbit user EEPROM
RF_IN
11
10 S_CLK
S0
• 14-pin DIP/SOIC package
MCLR
S_DAT
NC
6
7
9
8
Typical Applications
NC
• Automotive remote entry systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage openers
• Electronic door locks
BLOCK DIAGRAM
RFIN
Reception Register
• Identity tokens
• Burglar alarm systems
DECRYPTOR
EE_DAT
EE_CLK
Internal
S_DAT
S_CLK
S0
S1
MCLR
CONTROL
Compatible Encoders
EEPROM
All encoders and transponders configured for the fol-
lowing setting:
OSCILLATOR
• PWM modulation format (1/3-2/3)
• TE in the range from 100 µs to 400 µs
• 10 x TE Header
The manufacturer’s code, encoder decryption keys,
and synchronization information are stored in
encrypted form in internal EEPROM. The HCS515
uses the S_DAT and S_CLKinputs to communicate
with a host controller device.
• 28-bit Serial Number
• 16-bit Synchronization counter
• Discrimination bits equal to Serial Number 8 LSbs
• 66- to 69-bit length code word.
The HCS515 operates over a wide voltage range of
4.5V – 5.5V. The decoder employs automatic bit rate
detection, which allows it to compensate for wide vari-
2002 Microchip Technology Inc.
DS40183D-page 1