GENERAL DESCRIPTION
The rfHCS362G/362F is a code hopping encoder plus UHF transmitter designed for secure wireless command and control systems. The rfHCS362G/362F utilizes the KEELOQ® code hopping technology which incorporates high security in a small package outline at a low cost to make this device well suited for unidirec tional remote keyless entry systems and access control systems.

General
• Combination KEELOQ® encoder and synthesized
UHF ASK/FSK transmitter in a single package
• Operates on a single lithium coin cell
- <200 nA typical standby current
- 4.8 to 11.5 mA transmit current
- 2.2 to 5.5V operation
• Integrated solution with minimum external parts
• Separate pin-outs for KEELOQ encoder and RF
transmitter provides for design flexibility

Code Hopping Encoder
• Programmable minimum code word completion
• Battery low signal transmitted to receiver with programmable threshold
• Non-volatile EEPROM storage of synchronization data
• Easy to use EEPROM programming interface
• PWM or Manchester modulation
• Selectable encoder data rate 417 to 3334 bps
• On-chip tunable encoder oscillator
• RF Enable output for transmitter control
• Button inputs have internal pull-down resistors
• Elapsed time and button queuing options
• Current limiting on LED output
• 2-bit CRC for error detection

UHF ASK/FSK Transmitter
• 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 maximizerange and interference immunity
• Crystal frequency divide by 4 output (CLKOUT)
• Transmit frequency range (310 – 440 MHz) set by Crystal frequency
• ASK Modulation
• FSK Modulation through crystal pulling (rfHCS362F)
• Adjustable output power: -12 dBm to +2 dBm
• Differential output configurable for single or double ended loop antenna
• Automatic power amplifier inhibit until PLL lock

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