HCS370_11 Datasheet, PDF (1/42 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder Four selectable baud rates

HCS370
KEELOQ® Code Hopping Encoder
FEATURES
Security
• Two programmable 32-bit serial numbers
• Two programmable 64-bit encoder keys
• Two programmable 60-bit seed values
• Each transmission is unique
• 67/69-bit transmission code length
• 32-bit hopping code
• Crypt keys are read protected
Operating
• 2.05-5.5V operation
• Six button inputs
• 15 functions available
• Four selectable baud rates
• Selectable minimum code word completion
• Battery low signal transmitted to receiver
• Nonvolatile synchronization data
• PWM, VPWM, PPM, and Manchester modulation
• Button queue information transmitted
• Dual Encoder functionality
Other
• On-chip EEPROM
• On-chip tuned oscillator (±10% over voltage and
temperature)
• Button inputs have internal pull-down resistors
• LED output
• PLL control for ASK and FSK
• Low external component count
• Step-up voltage regulator
Typical Applications
The HCS370 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
• Automotive RKE systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage door openers
• Identity tokens
• Burglar alarm systems
PACKAGE TYPES
PDIP, SOIC,
TSSOP
S0 1
S1 2
S2 3
S3 4
S4 5
SLEEP/S5 6
SHIFT 7
14 VDD
13 LED
12 DATA
11 Vss
10 RFEN
9 STEP
8 VIN
HCS370 BLOCK DIAGRAM
VIN
Step-up
STEP ^regulator
Oscillator
RESET circuit
LED
RFEN
LED driver
RF Enable
Controller
Power ^SLEEP
latching
and
switching
EEPROM
Encoder
DATA
VSS
VDD
32-bit SHIFT register
Button input port
SHIFT S5 S4 S3 S2 S₁
S₀
GENERAL DESCRIPTION
The HCS370 is a code hopping encoder designed for
secure Remote Keyless Entry (RKE) and secure
remote control systems. The HCS370 utilizes the
KEELOQ® code hopping technology, which incorpo-
rates high security, a small package outline, and low
cost to make this device a perfect solution for unidirec-
tional authentication systems and access control sys-
tems.
The HCS370 combines a hopping code generated by a
nonlinear encryption algorithm, a serial number, and
status bits to create a secure transmission code. The
length of the transmission eliminates the threat of code
scanning and code grabbing access techniques.
2011 Microchip Technology Inc.
DS41111E-page 1