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