HCS473PROM datasheet(5/68 Pages) MICROCHIP

Part #	HCS473PROM

Description	Code Hopping Encoder and Transponder

Download	68 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

Logo

5 / 68 page

 2002 Microchip Technology Inc.

Preliminary

DS40035C-page 3

HCS473

1.0

GENERAL DESCRIPTION

The HCS473 combines the patented K

EELOQ code

hopping technology and bi-directional transponder

challenge-and-response security into a single chip

solution for logical and physical access control.

The three-input transponder interface allows the com-

bination of three orthogonal transponder antennas,

eliminating the directionality associated with traditional

single antenna transponder systems.

When used as a code hopping encoder, the HCS473 is

well suited to keyless entry systems; vehicle and

garage door access in particular. The same HCS473

can also be used as a secure bi-directional transponder

for contactless authentication. These capabilities make

the HCS473 ideal for combined secure access control

and identification applications, dramatically reducing

the cost of hybrid transmitter/transponder solutions.

1.1

System Overview

1.1.1

KEY TERMS

The following is a list of key terms used throughout this

data sheet. For additional information on terminology,

please refer to the K

EELOQ introductory Technical Brief

(TB003).

• AGC - Automatic Gain Control.

• Anticollision - A scheme whereby transponders

in the same field can be addressed individually,

preventing simultaneous response to a command

(Section 3.2.1.4).

• Button Status - Indicates what button input(s)

activated the transmission. Encompasses the 4

button status bits S3, S2, S1 and S0 (Figure 3-2).

• Code Hopping - A method by which a code,

viewed externally to the system, appears to

change unpredictably each time it is transmitted

(Section 1.2.3).

• Code word - A block of data that is repeatedly

transmitted upon button activation (Figure 3-2).

• Crypto key - A unique and secret 64-bit number

used to encrypt and decrypt data. In a symmetri-

cal block cipher such as the K

EELOQ algorithm,

the encryption and decryption keys are equal and

will therefore be referred to generally as the

crypto key.

• Decoder - A device that decodes data received

from an encoder.

• Decryption algorithm - A recipe whereby data

scrambled by an encryption algorithm can be

unscrambled using the same crypto key.

• Device Identifier - 16-bit value used to uniquely

select one of multiple transponders for communi-

cation.

• Encoder - A device that generates and encodes

data.

• Encryption Algorithm - A recipe whereby data is

scrambled using a crypto key. The data can only

be interpreted by the respective decryption algo-

rithm using the same crypto key.

• IFF - Identify Friend or Foe, a classic authentica-

tion method (Section 3.2.3.3).

• Learn - Learning involves the receiver calculating

the transmitter’s appropriate crypto key, decrypt-

ing the received hopping code and storing the

serial number, synchronization counter value and

crypto key in EEPROM (Section 5.1). The

K

EELOQ product family facilitates several learning

strategies to be implemented on the decoder. The

following are examples of what can be done.

• Simple Learning

The receiver uses a fixed crypto key, common to

all components of all systems by the same manu-

facturer, to decrypt the received code word’s

encrypted portion.

• Normal Learning

The receiver uses information transmitted during

normal operation to derive the crypto key and

decrypt the received code word’s encrypted por-

tion.

• Secure Learn

The transmitter is activated through a special but-

ton combination to transmit a stored 60-bit seed

value used to derive the transmitter’s crypto key.

The receiver uses this seed value to calculate the

same crypto key and decrypt the received code

word’s encrypted portion.

• LF - Low Frequency. For HCS473 purposes, LF

refers to a typical 125 kHz frequency.

• Manufacturer’s code – A unique and secret 64-

bit number used to generate unique encoder

crypto keys. Each encoder is programmed with a

crypto key that is a function of the manufacturer’s

code. Each decoder is programmed with the man-

ufacturer code itself.

• Proximity Activation - A method whereby an

encoder automatically initiates a transmission in

response to detecting an inductive field

(Section 3.1.1.2).

• PKE - Passive Keyless Entry.

• RKE - Remote Keyless Entry.

• Transmission - A data stream consisting of

repeating code words.

• Transcoder - Device combining unidirectional

transmitter capabilities with bi-directional authenti-

cation capabilities.

• Transponder - A transmitter-receiver activated

for transmission by reception of a predetermined

signal.

Similar Part No. - HCS473PROM

Manufacturer	Part #	Datasheet	Description
Microchip Technology	HCS473	1Mb / 68P	KEELOQ짰 3-Axis Transcoder 2000-2013

More results

Similar Description - HCS473PROM

Manufacturer	Part #	Datasheet	Description
Microchip Technology	HCS410	481Kb / 36P	KEELOQ짰 Code Hopping Encoder and Transponder 2001
	HCS412	704Kb / 44P	KEELOQ Code Hopping Encoder and Transponder 2002
	HCS410	259Kb / 36P	KEELOQ CODE HOPPING ENCODER AND TRANSPONDER 1997 - 1998
	HCS412	1Mb / 52P	KEELOQ짰 Code Hopping Encoder and Transponder Burglar alarm systems 2011
	HCS361	343Kb / 24P	KEELOQ CODE HOPPING ENCODER 1996 - 1997
	HCS320	435Kb / 32P	KEELOQ Code Hopping Encoder 2001
	HCS362-I	489Kb / 38P	KEELOQ Code Hopping Encoder 01/18/02
	HCS200	728Kb / 34P	KEELOQ짰 Code Hopping Encoder 32-bit hopping code 2011
	HCS370	518Kb / 36P	KEELOQ Code Hopping Encoder 2002
	HCS360	421Kb / 28P	KEELOQ짰 Code Hopping Encoder 2001

More results

HCS473PROM Datasheet(PDF) 5 Page - Microchip Technology

HCS473PROM Datasheet(HTML) 5 Page - Microchip Technology

Similar Part No. - HCS473PROM

Similar Description - HCS473PROM

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Datasheet Download

Link URL