RFHCS362G_11 Datasheet, PDF (1/54 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder with UHF ASK/FSK Transmitter

rfHCS362G/362F
KEELOQ® Code Hopping Encoder with
UHF ASK/FSK Transmitter
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 pro-
grammable 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 maximize
range 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
Pin Diagrams
SOIC
VDD
LED/SHIFT
S0
S1
RFENIN
CLKOUT
PS/DATAASK
VDDRF
ANT2
SSOP
VDD
LED/SHIFT
S0
S1
XTAL
RFENIN
CLKOUT
PS/DATAASK
VDDRF
ANT2
•1
18
2
17
3
16
4
15
5
14
6
13
7
12
8
11
9
10
•1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VSS
DATA
S3/RFENOUT
S2
XTAL
LF
NC
VSSRF
ANT1
VSS
DATA
S3/RFENOUT
S2
FSKOUT
DATAFSK
LF
NC
VSSRF
ANT1
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
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
Device
Encrypt
Keys
rfHCS362AG 2 x 64
rfHCS362AF 2 x 64
Features
Encoding Transmitter
PWM/MAN
ASK
PWM/MAN ASK/FSK
© 2011 Microchip Technology Inc.
DS41189B-page 1