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KEELOQ® HCS1XX/2XX/3XX

Encoder Family

The KEELOQ® family of encoders offers a complete range

of products for Remote Control and secure Remote

Keyless Entry (RKE) Applications. The encoders range

from the HCS101, a fixed code encoder designed for

remote control systems to the HCS2XX and HCS3XX

products, which utilize Microchip’s patented KEELOQ

hopping technology. The devices incorporates a small

package outline, low cost and the minimum external

components to make these device suited for unidirectional

remote keyless entry, remote control and access control

systems. The Code Hopping Encoders combine a 32-bit

hopping code generated by a non-linear encryption

algorithm, with a 32-bit serial number and information bits

to create a transmission stream of up to 69 bits. The

length of the transmission eliminates the threat of code

scanning, and the code hopping mechanism makes each

transmission unique, thus rendering code capture and

resend schemes useless.

Security Features:

•Up to 2 programmable 32-bit serial numbers

•Up to 2 programmable 64-bit encoder keys

•Up to 2 programmable 60-bit seed values

•Each transmission is unique

•Up to 69-bit transmission code length

•32-bit hopping code

•Encoder keys are read protected

Operating Features:

•2.0 – 13.3V operation

•Up to six button inputs

•15 functions available

•Up to 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 Features:

•On-chip EEPROM

•On-chip tuned oscillator (±10%)

•Button inputs have internal pull-down resistors

•LED output

•PLL control for ASK and FSK

•Low external component count

Typical Applications:

•Automotive RKE systems

•Automotive alarm systems

•Automotive immobilizers

•Gate and garage door openers

•Identity tokens

•Burglar alarm systems

Related Application Notes:

•AN217 – KEELOQ HCS30X, HCS200 Stand-Alone

Programmer

•AN645 – PIC16C57 -Based Code Hopping

Security System

•AN661 – Code Hopping Decoder using PIC16C56

•AN662 – Code Hopping Decoder using Secure

Learn

•AN663 – Simple Code Hopping Decoder

•AN665 – Using KEELOQ to Generate Hopping

Passwords

•AN672 – PICmicro® Mid-range MCU Code

Hopping Decoder

•AN740 – Decoding the HCS101 for Non-Secure

Applications

•AN742 – Modular PICmicro Mid-Range Code

Hopping Decoder

•AN744 – Modular Mid-Range PICmicro KEELOQ

Decoder in C

•TB001 – Secure Learning RKE Systems using

KEELOQ Encoders

•TB003 – An Introduction to KEELOQ Code Hopping

•TB021 – A Guide to Designing for EuroHomelink

Compatibility

•TB042 – Interfacing a KEELOQ Encoder to a PLL

Circuit

•TB043 – KEELOQ CRC Verification Routines

HCS4XX Family Lineup

Encryption Code word Code Seed

Key Switch Length LengthHopping Operating Packages

Product (bits) (bits) (bits) (bits)Inputs Other Features Voltage Pins

HCS101 — — —3 66 Tuned oscillator 3.5V – 13V 8P, 8SN

HCS200 64 3 66 3232 — 3.5V – 13V 8P, 8SN

HCS201 64 3 66 3232 Tuned osc, Step-up Regulator 3.5V – 13V 8P, 8SN

HCS300 64 4 66 3232 LED, Time-out, overflow 2.0V – 6.3V 8P, 8SN

HCS301 64 4 66 3232 LED, Time-out, overflow 3.5V – 13V 8P, 8SN

HCS320 64 4 66 3232 LED, Time-out, overflow, shift function 3.5V – 13V 8P, 8SN

HCS360 64 4 67 4832 Time-out, overflow, IR Mode, PWM, 2.0V – 6.3V 8P, 8SN

Manchester, CRC

HCS361 64 4 67 4832 Time-out, overflow, IR Mode, PWM 2.0V – 6.3V 8P, 8SN

VPWM, CRC

HCS362 64 4 69 6032 Time-out, Guard Time, PWM, 2.0V – 6.3V 8P, 8SN,

TSSOP Manchester, CRC, Tuned osc

HCS365 2 x 64 4 69 6032 Tuned osc, Dual mode, PWM, PPM, 2.0V – 5.5V 8P, 8SM

Manchester, VPWM

Information subject to change. The Microchip name and logo, The Embedded Control Solutions Company, PIC, PICmicro, PICSTART, PRO MATE, MPLAB, and KEELOQ are registered trademarks

of Microchip Technology Incorporated in the U.S.A. and other countries. In-Circuit Serial Programming, ICSP, ICEPIC, microID, MXDEV, MPLIB, MPLINK, MPASM, PICC, and PICDEM.net are

trademarks of Microchip in the U.S.A. SQTP is a service mark of Microchip Technology Inc. All other trademarks mentioned herein are the property of their respective companies.

*DS41162A*

Microchip Technology Inc. •2355 W. Chandler Blvd. •Chandler, AZ 85224-6199 •(480) 792-7200 •FAX (480) 792-9210

Customer Support:

Microchip maintains a worldwide network of distributors, representatives, local sales offices, Field Application Engineers, and

Additional Information:

•Microchip’s web site: www.microchip.com

•Microchip’s Technical Library CD-ROM, Order No. DS00161

•Secure Data Products Handbook, Order No. DS40168

•Application Notes are available in:

– Embedded Control Handbook, Order No. DS00092

– Embedded Control Handbook, , Volume 2, Math Library Order No. DS00167

–Embedded Control Handbook Update 2000, Order No. DS00711

•Microchip’s Non-Volatile Memory Products Data Book, Order No. DS00157

•Microchip’s Overview, Quality Systems and Customer Interface System, Order No. DS00169

•Third Party software and hardware support:

– Emulators

– Programmers

– Gang Programmers

– Software Tools

– Development Boards and Accessories

– Design Consultants

– Third Party Guide, Order No. DS00104

Development Tools from Microchip Resale Price*

KEEL LOQ Evaluation Kit Demonstrate, evaluate and prototype KEE OQ devices $299

KEEL LOQ Transponder Evaluation Kit Demonstrate, evaluate and prototype KEE OQ devices $399

*All prices are manufacturer’s suggested resale for North America.

Frequently asked questions

What is KEELOQ C Hode opping and why do I need it?

KEELOQ C Hode opping is a technology developed specifically for secure remote keyless entry and authentication. The basic principle is that the code change (hop)

each time it is transmitted. It is equivalent to changing the mechanical key on a door each time after you lock or unlock the door. This makes it nearly impossible for a

thief to capture and re-transmit the code used to lock/unlock a door or vehicle.

How do I get started with KEELOQ?

The easiest way to get hands-on experience with KEEL LOQ is to purchase a KEE OQ Evaluation Kit. The evaluation kit contains a complete hardware system that includes

receiver, decoder and different learning options. It also includes easy to use software that allows you to program the various devices and display the results of

encrypting and decrypting data.

What is the KEELOQ Licensing disk and how do I get it?

The KEELOQ Licensing disk contains various firmware implementations of decoders that enable you to decrypt the code-hopping portion of the KEELOQ transmissions. It

also contains application notes and Windows® software that allows you to encrypt, decrypt and experiment with various Learning Schemes. The Licensing disk is free

and available through the Literature Center (DS40149).

What is Learning?

Learning is a method to match the encoder (transmitter) to the decoder (receiver). There are various Learning methods that depend on the level of security the user

requires.