RfHCS362G / RfHCS362F KEELOQ Encoder With RF Transmitter Datasheet

rfHCS362G / rfHCS362F KEELOQ Encoder with RF Transmitter

The rfHCS devices provide a single chip that combines the KEELOQ technology with the Low Power Radio Frequency circuitry required for remote control and authentication systems. The rfHCS362G and rfHCS362F combine a 32-bit hopping code generated by a non-linear encryption algorithm, with a serial number and status bits to create a 69-bit transmission stream that is unique every time the device is activated. The length of the transmission protects against the threat of code scanning, and the code hopping mechanism protects against code capture and re-send schemes. The devices offer small package outline and low external component count to fit the most space-constrained applications. The rfHCS362G, an 18-pin device, features an integrated 310-440 MHz Amplitude Shift Key (ASK) transmitter. The rfHCS362F, a 20-pin device, features a Frequency Shift Key (FSK) and ASK transmitter covering the same frequency range.

UHF ASK/FSK Transmitter:

Security:
• Programmable 28/32-bit serial number
• Two programmable 64-bit encryption keys
• Programmable 60-bit seed
• Each 69-bit transmission is unique with 32 bits of hopping code
• Encryption keys are read protected Code Hopping Encoder:
• Programmable minimum code word completion
• Battery low signal transmitted to receiver with programmable threshold
• Non-volatile EEPROM storage of synchronization data
• PWM or Manchester encoding
• Selectable encoder data rate 417 to 3334 bps
• Easy to use EEPROM programming interface
• On-chip tunable encoder oscillator
• Button inputs have internal pull-down resistors
• Current limiting on LED output
• 2-bit CRC for error detection
• Elapsed time and button queuing options
• Conforms to US FCC Part 15.231 regulations and European ERC 70-03E and EN 300 220-1 requirements
• VCO phase locked to quartz crystal reference allows narrow receiver bandwidth to maximize range and interference immunity
• Crystal frequency divide by 4 output (CLKOUT)
• Frequency range set by crystal 310-440 MHz
• ASK/FSK Modulation
• Adjustable output power -12 dBm to +2 dBm
• Differential output configurable for single or double ended loop antenna

Applications:
• Automotive Remote Keyless Entry (RKE) systems
• Automotive alarm systems
• Automotive immobilizers
• Community gate and garage door openers
• Identity tokens with usage counters
• Burglar alarm systems
• Building access

Part Number rfHCS362G rfHCS362F

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