HCS410 datasheet(2/36 Pages) MICROCHIP

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HCS410

DS40158E-page 2

Preliminary

 2001 Microchip Technology Inc.

DESCRIPTION

The HCS410 is a code hopping transponder device

designed for secure entry systems. The HCS410 uti-

lizes the patented KEELOQ code hopping system and

bi-directional challenge-and-response for logical and

physical access control. High security learning mecha-

nisms make this a turnkey solution when used with the

KEELOQ decoders. The encoder keys and synchroniza-

tion information are stored in protected on-chip

EEPROM.

A low cost batteryless transponder can be imple-

mented with the addition of an inductor and two capac-

itors. A packaged module including the inductor and

capacitor will also be offered.

A single HCS410 can be used as an encoder for

Remote Keyless Entry (RKE) and a transponder for

immobilization in the same circuit and thereby dramat-

ically reducing the cost of hybrid transmitter/transpon-

der circuits.

1.0

SYSTEM OVERVIEW

1.1

Key Terms

• Anti-Collision – Allows two transponders to be in

the files simultaneously and be verified individu-

ally.

• CH Mode – Code Hopping Mode. The HCS410

transmits a 69-bit transmission each time it is acti-

vated, with at least 32-bits changing each time the

encoder is activated.

• Encoder Key – A unique 64-bit key generated and

programmed into the encoder during the manu-

facturing process. The encoder key controls the

encryption algorithm and is stored in EEPROM on

the encoder device.

• IFF – Identify friend or foe is a means of validating

a token. A decoder sends a random challenge to

the token and checks that the response of the

token is a valid response.

• KEELOQ Encryption Algorithm – The high security

level of the HCS410 is based on the patented

KEELOQ technology. A block cipher encryption

algorithm based on a block length of 32 bits and a

key length of 64 bits is used. The algorithm

obscures the information in such a way that even

if the unencrypted/challenge information differs by

only one bit from the information in the previous

transmission/challenge, the next coded transmis-

sion/response will be totally different. Statistically,

if only one bit in the 32-bit string of information

changes, approximately 50 percent of the coded

transmission will change.

• Learn – The HCS product family facilitates sev-

eral learning strategies to be implemented on the

decoder. The following are examples of what can

be done.

Normal Learn –The receiver uses the same infor-

mation that is transmitted during normal operation to

derive the transmitter’s encoder key, decrypt the dis-

crimination value and the synchronization counter.

Secure Learn* – The transmitter is activated through

a special button combination to transmit a stored

60-bit value (random seed) that can be used for key

generation or be part of the key. Transmission of the

random seed can be disabled after learning is com-

pleted.

• Manufacturer’s Code – A 64-bit word, unique to

each manufacturer, used to produce a unique

encoder key in each transmitter (encoder).

• Passive Proximity Activation – When the HCS410

is brought into in a magnetic field without a

command given by the base station, the HCS410

can be programmed to give an RF transmission.

• Transport Code – A 32-bit transport code needs to

be given before the HCS410 can be inductively

programmed. This prevents accidental

programming of the HCS410.

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