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LLCC68 Datasheet(PDF) 39 Page - Semtech Corporation |
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LLCC68 Datasheet(HTML) 39 Page - Semtech Corporation |
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39 / 106 page  LLCC68 Data Sheet Rev. 1.0 DS.LLCC68.W.APP July 2019 39 of 106 Semtech www.semtech.com The bandwidth must be chosen so that Bandwidth[DSB] ≥ BR + 2*frequency deviation + frequency error where the frequency error is two times the crystal frequency error used. The LLCC68 offers several pulse shaping options defined by the parameter PulseShape. If other unspecified values are given as parameters, then no filtering is used. 6.2.2 FSK Packet Engine The LLCC68 is designed for packet-based transmission. The packet controller block is responsible for assembly of received data bit-stream into packets and their storage into the data buffer. It also performs the bit-stream decoding operations such as de-whitening & CRC-checks on the received bit-stream. On the transmit side, the packet handler can construct a packet and send it bit by bit to the modulator for transmission. It can whiten the payload and append the CRC-checksum to the end of the packet. The packet controller only works in half-duplex mode i.e. either in transmit or receive at a time. The packet controller is configured using the command SetPacketParams(...) as in Section 13.4.6 "SetPacketParams" on page 83. This function can be called only after defining the protocol. The next chapters describe in detail the different frames available in the LLCC68. 6.2.2.1 Preamble Detection in Receiver Mode The LLCC68 is able to gate the reception of a packet if an insufficient number of alternating preamble symbols (usually referred to 0x55 or 0xAA in hexadecimal form) has been detected. This can be selected by the user by using the parameter PreambleDetectorLength used in the command SetPacketParams(...). The user can select a value ranging from “Preamble detector length off” - where the radio will not perform any gating and will try to lock directly on the following Sync Word - BW39 0x1C 39.0 BW46 0x14 46.9 BW58 0x0C 58.6 BW78 0x1B 78.2 BW93 0x13 93.8 BW117 0x0B 117.3 BW156 0x1A 156.2 BW187 0x12 187.2 BW234 0x0A 234.3 BW312 0x19 312.0 BW373 0x11 373.6 BW467 0x09 467.0 Table 6-4: Bandwidth Definition in FSK Packet Type BW Value Bandwidth [kHz DSB] |
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