LLCC68 datasheet(39/106 Pages) SEMTECH

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

Value

Bandwidth [kHz DSB]

LLCC68 데이터시트(PDF) 39 Page - Semtech Corporation

LLCC68 데이터시트(HTML) 39 Page - Semtech Corporation

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 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL