HCS410 datasheet(3/36 Pages) MICROCHIP

Part #	HCS410

Description	KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

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Manufacturer	MICROCHIP [Microchip Technology]

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HCS410

Preliminary

DS40158C-page 3

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

• Anticollision – 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 several

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.

*Secure Learn patent pending.

Similar Part No. - HCS410

Manufacturer	Part #	Datasheet	Description
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	HCS410-ISN	481Kb / 36P	KEELOQ짰 Code Hopping Encoder and Transponder 2001

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