Microchip HCS412 Handleiding

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The KEELOQcode hopping technologyis 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?

KEELOQis 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.

KEELOQEncoders:

The encoders range from the HCS101, a fixed encoder

designed for remote control systems, to HCS2XX and

HCS3XX products, which utilize Microchip’s patented

KEELOQcode 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.

KEELOQDecoders:

The HCS5XX decoders offer a standard solution when

used with the KEELOQencoders 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.

KEELOQTranscoder/Encoder Family:

The KEELOQHCS4XX 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

®

AuthenticationUser authorization

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

Odometer counterImmobilizers

Property identificationWireless home security

Garage door openersRemote control

Remote gate openersClone protection

Typical Applications:

KEELOQ® Code Hopping Devices

Product specificaties