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HCS410-P Datasheet(PDF) 2 Page - Microchip Technology |
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HCS410-P Datasheet(HTML) 2 Page - Microchip Technology |
2 / 36 page 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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