HCS515_11 Datasheet, PDF (1/38 Pages) Microchip Technology – KEELOQ® Code Hopping Decoder stand-alone decoder

HCS515
KEELOQ^® Code Hopping Decoder
FEATURES
Security
• 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
• 4.5V – 5.5V operation
• Internal oscillator
• Auto bit rate detection
Other
• Stand-alone decoder
• Internal EEPROM for transmitter storage
• Synchronous serial interface
• 1 Kbit user EEPROM
• 14-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 encoders and transponders configured for the fol-
lowing 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. 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.
PACKAGE TYPE
PDIP, SOIC
NC 1
NC 2
VDD 3
S1 4
S0 5
MCLR ₆
NC ⁷
14 NC
13 NC
12 Vss
11 RF_IN
10 S_CLK
9 ^S_DAT
8 _NC
BLOCK DIAGRAM
RFIN
Reception Register
Internal
EEPROM
EE_DAT
EE_CLK
CONTROL
OSCILLATOR
DECRYPTOR
S_DAT
S_CLK
S0
S1
MCLR
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_CLK inputs to communicate
with a host controller device.
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-
© 2011 Microchip Technology Inc.
DS40183E-page 1