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4010-DAAKF-434 Datasheet(PDF) 3 Page - Silicon Laboratories |
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4010-DAAKF-434 Datasheet(HTML) 3 Page - Silicon Laboratories |
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3 / 14 page  Si4010-Keyfob-AES-DEMO Rev 1.1 3 3. Key Fob Demo with AES Capability The 4010-DAPB RKE key fob transmitter and the Si4313 FSK receiver are the transmit and receive devices used in this key fob demo. This transmit/receive pair can be used to evaluate the capabilities of the Si4010 transmitter and the Si4313 receiver. 3.1. Operation of the Demo The Si4313 demo receiver board uses the following RF parameters: 9.6 kbps FSK modulation 433.92 MHz or 868.3 MHz center frequency (menu selectable) ±70 kHz deviation If any push button is pressed on the key fob, it sends a message to the receiver. The demo uses Silicon Labs' general EZMacPRO protocol. 3.2. Association To enable the receiver to react to the button presses on the key fob(s), they have to be paired (i.e., the key fob has to be associated to the receiver by pressing the left and right buttons simultaneously on the key fob). 3.2.1. Meanings of the Different Fields AES—Defines whether the transmitter is using AES-128 encryption or not. It is set to 0x01; then, the Rolling counter field of the packets is extended to 16 bytes length (12 dummy bytes are appended) and is encoded by AES-128. Other fields of the packet are not affected by the encryption. Address—4 bytes of key fob address. The four byte random number factory burned in the Si4010 is used as the address. Rolling Counter—The transmitter increments a 4 byte counter after every packet transmission. This counter is stored in the MTP memory of the Si4010. If the receiver accepts the association, it registers the Address, Master Key, and Rolling Counter value of the requesting key fob. The Master accepts the association if it is in pairing mode and there is a free slot for a key fob (i.e., if there are fewer than four key fobs associated to the receiver). After power up, the Receiver board is in pairing mode automatically. After pairing, it goes to normal packet reception mode. The Pairing mode can be invoked by pressing the push button, PB3, on the Receiver Board. This button needs to be pressed before the second and any subsequent pairing. If the PB is pressed for more than one second, the receiver disassociates all key fobs. Table 1. General EZMacPRO Extended Packet Configuration Used by Demo Key Fobs Preamble Synch Word MAC Header MAC Payload CRC Min.13 bytes 2 bytes 5 bytes 0...64 bytes 2 bytes 0xAA...0xAA 0x2DD4 CTRL CID SID DID PL NHDR NWK payload CRC Table 2. The MAC Payload Field of the “Associate Request from TX only Device” Packet MAC Payload NHDR NWK Payload 1 byte 1 bytes 1 byte 1 byte 4 byte 4 byte 0x47 0x05 0x01 AES Address Rolling Counter |
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