HCS200T/SN - Microchip Technology

The KEELOQ code hopping technology is a

worldwide standard providing a simple yet highly secure

solution for authentication, remote-keyless-entry (RKE) or

passive-keyless-entry (PKE) applications.

These off-the-shelf code hopping devices allow you to

easily implement very secure system designs at a low-cost

in a small form factor. All the devices, from the low-cost,

low-end HCS101 encoder to the high-end HCS370 encoder

and HCS410/412/473 transcoders, incorporate high

security, a small package ouline and low cost to form an

ideal combination for multifunctional, security designs.

The Key?

KEELOQ is based on a proprietary, non-linear encryption

algorithm that creates a unique transmission on every

use, rendering code capture and resend schemes useless.

The algorithm uses a programmable 64-bit encryption key

unique to each device to generate 32-bit hopping code.

The key-length and code-hopping combination reduces the

possibility of unwanted access.

KEELOQ Encoders:

The encoders range from the HCS101, a fixed encoder

designed for remote control systems, to HCS2XX and

HCS3XX products, which utilize Microchip’s patented

KEELOQ code hopping technology. The devices incorporate

a small package outline, are low-cost and have minimal

external components making them well suited for uni-

directional RKE, 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.

KEELOQ Decoders:

The HCS5XX decoders offer a standard solution when

used with the KEELOQ encoders to implement uni-

directional remote and aceess control systems. The

HCS5XX decoders operate over a wide voltage range and

can be used as stand-alone decoders or in conjunction

with PIC® MCUs through a serial or parallel interface.

Microchip also offers a variety of software decoders that

allows the system designer to integrate the KEELOQ

decoding functions with their applications onto a single PIC

MCU. The software decoders come as part of a licensing

package (DS40038) and include the decoding algorithm,

receive routines and support various learning schemes to

reduce development time and get the product to market

faster.

KEELOQ Transcoder/Encoder Family:

The KEELOQ HCS4XX family of transponder and encoder

combinations provide a single-chip solution that brings

together uni-directional code hopping and bi-directional

transponder identification (IFF). The HCS4XX devices

integrate the transponder circuitry needed to perform

electronic verification of authenticity. The HCS4XX family

forms a complete line of products ranging from the

HCS410 for short range battery-less operation, the

HCS412 for longer range single antenna applications and

the HCS473 providing three sensitive antenna inputs for

long range omni-directional communication.

Microchip Technology Inc. ·The Embedded Control Solutions Company®

Authentication User authorization

Remote Keyless Entry (RKE) Passive Keyless Entry (PKE)

Odometer counter Immobilizers

Property identification Wireless home security

Garage door openers Remote control

Remote gate openers Clone protection

Typical Applications:

KEELOQ® Code Hopping Devices

Information subject to change. The Microchip name and logo, The Embedded Control Solutions Company, PIC, PICmicro, PICSTART, PRO MATE, and MPLAB 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 USA and other countries. SQTP is a service mark of Microchip Techology Inc. All other trademarks mentioned herein are the property of their respective companies.

Evaluation Kits:

The K

Evaluation Kit II (DM303006) and K

Transponder Evaluation Kit (DM303005) demonstrate the

capabilities of K

code hopping technology. The K

Evaluation Kit II contains all the necessary hardware to

evaluate a code hopping system, including two

transmitters and a multi-function receiver board that

supports the HCS5XX stand-alone decoders. Additionally,

it allows the user to develop his own software to receive,

decode and interpret the K

transmission. The K

Transponder Evaluation Kit consists of a base station, a

transmitter/transponder, a batteryless transponder, and

various HCS4XX samples. All K

evaluation kits

include PC software to configure, program and evaluate the

system without additional hardware.

Microchip Evaluation Kits Offer Complete Development

Cycle Support:

Microchip Technology Inc. •2355 W. Chandler Blvd. •Chandler, AZ 85224-6199 •(480) 792-7200 •FAX (480) 792-4150

Comprehensive Development Systems and Support:

Microchip is committed to providing useful and innovative

development tools that allow designers to meet design and

time-to-market requirements. K

evaluation kits and

programming tools support Microchip’s K

code hopping

devices. The K

development tools allow system engineers

to quickly evaluate, prototype, make code changes, and get

designs to market faster than ever before.

The

PRO MATE

II Programmer

(DV007003) provides

manufacturing with the capability to program K

devices in

production quantities. The PRO MATE II Programmer is supplied

with software to automate the programming in the customer’s

factory production environment. The Manufacturer’s Code is

protected by two custodian keys that have to be entered before

programming can start. Microchip supplies the various socket

adapters for PDIP and SOIC devices as well as In-Circuit Serial

Programming™ (ICSP™).

Application Notes:

A wide range of application notes offer design engineers

detailed technical information to remove roadblocks during the

development cycle. The application notes available are:

•K

HCS30X, HCS200 Stand-Alone Programmer (AN217)

•PIC16C57 Based Code Hopping Security System (AN645)

•Designing a Transponder Coil for the HCS410 (AN650)

•K

Code Hopping Decoder Using a PIC16C56 (AN661)

•K

Code Hopping Decoder Using Secure Learn (AN662)

•K

Simple Code Hopping Decoder (AN663)

•Using K

to Generate Hopping Passwords (AN665)

•K

Code Hopping Decoder Implemented on Microchip

Midrange MCUs (PIC16C6X, PIC16C7X, PIC16C62X) (AN672)

•K

HCS410 Transponder Decoder Using a PIC16C56

(AN675)

•Designing a Base Station Coil for the HCS410 (AN677)

•Wireless Home Security Implementing K

and the

PICmicro® Microcontroller (AN714)

•Decoding the HCS101 for Non-Secure Applications (AN740)

•Modular Picmicro Mid-Range MCU Code Hopping Decoder

(AN742)

•Modular Mid-Range PICmicro K

Decoder in C (AN744)

•Secure Learning RKE Systems Using Encoders (TB001)

•An Introduction to K

Code Hopping Technical Brief

(TB003)

•Interfacing a K

Encoder to a PLL Circuit (TB042)

•K

CRC Verification Routines (TB043)

•K

Manchester Encoding Receive Routines (TB045)

Additional Information:

secure solution CD, Order No. DS40038

·Microchip's web site: www.microchip.com

Step 1

Configure the system to match

encoders with decoders.

Step 2

Set-up product specific

parameters and program the

devices

Step 3

Evaluate and monitor

transmissions as received by

the decoders.