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HCS410 データシート(PDF) 4 Page - Microchip Technology |
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HCS410 データシート(HTML) 4 Page - Microchip Technology |
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4 / 46 page  HCS410 DS40158F-page 4 © 2011 Microchip Technology Inc. 1.3 KEELOQ IFF The HCS410 can be used as an IFF transponder for verification of a token. In IFF mode the HCS410 is ide- ally suited for authentication of a key before disarming a vehicle immobilizer. Once the key has been inserted in the car’s ignition the decoder would inductively poll the key validating it before disarming the immobilizer. IFF validation of the token involves a random challenge being sent by a decoder to a token. The token then generates a response to the challenge and sends this response to the decoder (Figure 1-2). The decoder cal- culates an expected response using the same chal- lenge. The expected response is compared to the response received from the token. If the responses match, the token is identified as a valid token and the decoder can take appropriate action. The HCS410 can do either 16 or 32-bit IFF. The HCS410 has two encryption algorithms that can be used to generate a response to a challenge. In addition there are up to two encoder keys that can be used by the HCS410. Typically each HCS410 will be pro- grammed with a unique encoder key(s). In IFF mode, the HCS410 will wait for a command from the base station and respond to the command. The command can either request a read/write from user EEPROM or an IFF challenge response. A given 16 or 32-bit challenge will produce a unique 16/32-bit response, based on the IFF key and IFF algorithm used. FIGURE 1-2: BASIC OPERATION OF AN IFF TOKEN IFF Key Serial Number KEELOQ® IFF Algorithm Serial Number EEPROM Array Challenge Received from Decoder Response Read by Decoder 40158F.book Page 4 Wednesday, June 1, 2011 10:36 AM |
同様の部品番号 - HCS410_11 |
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同様の説明 - HCS410_11 |
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