SX1276IMLTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SX1276IMLTRT

137 MHz to 1020 MHz Low Power Long Range Transceiver

Semtech Corporation

SX1276IMLTRT Datasheet PDF : 132 Pages

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SX1276/77/78/79

WIRELESS, SENSING & TIMING

DATASHEET

Table 18 DIO Mapping LoRaTM Mode

Operating

Mode

ALL

DIOx

Mapping

DIO5

ModeReady

ClkOut

DIO4

CadDetected

PllLock

DIO3

CadDone

ValidHeader

PayloadCrcError

DIO2

DIO1

FhssChangeChannel

RxTimeout

FhssChangeChannel

CadDetected

DIO0

RxDone

TxDone

CadDone

4.1.7. Modem Status Indicators

The state of the LoRa modem is accessible with the ModemStatus bits in RegModemStat. They can mostly used for debug

in Rx mode and the useful indicators are:

 Bit 0: Signal Detected indicates that a valid LoRa preamble has been detected

 Bit 1: Signal Synchronized indicates that the end of Preamble has been detected, the modem is in lock

 Bit 3: Header Info Valid toggles high when a valid Header (with correct CRC) is detected

4.2. FSK/OOK Modem

4.2.1. Bit Rate Setting

The bitrate setting is referenced to the crystal oscillator and provides a precise means of setting the bit rate (or equivalently

chip) rate of the radio. In continuous transmit mode (Section 4.2.12) the data stream to be transmitted can be input directly

to the modulator via pin 10 (DIO2/DATA) in an asynchronous manner, unless Gaussian filtering is used, in which case the

DCLK signal on pin 9 (DIO1/DCLK) is used to synchronize the data stream. See section 4.2.2.3 for details on the Gaussian

filter.

In Packet mode or in Continuous mode with Gaussian filtering enabled, the Bit Rate (BR) is controlled by bits Bitrate in

RegBitrateMsb and RegBitrateLsb

BitRate = B----i---t--R----a---t--e---(--1---5-F--,-0-X--)--O--+---S--B---C------i----t----r-----a----1---t---6-e------F--------r-----a-------c--

Note: BitrateFrac bits have no effect (i.e may be considered equal to 0) in OOK modulation mode.

The quantity BitrateFrac is hence designed to allow very high precision (max. 250 ppm programing resolution) for any

bitrate in the programmable range. Table 19 below shows a range of standard bitrates and the accuracy to within which

they may be reached.

Rev. 4 - March 2015

Page 46

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