RFM95 datasheet(74/121 Pages) HOPERF

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Page 74

RFM95/96/97/98(W)

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WIRELESS & SENSING

PRELIMINARY

DATASHEET

LFS R P o ly nom ia l =X 9 + X 5 + 1

X 8

X 7

X 6

X 5

X 4

X 3

X 2

X 1

X 0

Tran sm it d ata

W hite ned data

Figure 37. Data Whitening Polynomial

4.2.13.8. Beacon Tx Mode

In some short range wireless network topologies a repetitive message, also known as beacon, is transmitted periodically

by a transmitter. The Beacon Tx mode allows for the re-transmission of the same packet without having to fill the FIFO

multiple times with the same data.

When BeaconOn in RegPacketConfig2 is set to 1, the FIFO can be filled only once in Sleep or Stdby mode with the

required payload. After a first transmission, FifoEmpty will go high as usual, but the FIFO content will be restored when the

chip exits Transmit mode. FifoEmpty, FifoFull and FifoLevel flags are also restored.

This feature is only available in Fixed packet format, with the Payload Length smaller than the FIFO size. The control of the

chip modes (Tx-Sleep-Tx....) can either be undertaken by the microcontroller, or be automated in the Top Sequencer. See

example in section 4.2.13.8.

The Beacon Tx mode is exited by setting BeaconOn to 0, and clearing the FIFO by setting FifoOverrun to 1.

4.2.14. io-homecontrol® Compatibility Mode

The RFM95/96/97/98(W) features a io-homecontrol® compatibility mode. Please contact your local Hope RF

representative for details on its implementation.

RFM95 Datasheet(PDF) 74 Page - Shenzhen Hope Microelectronics Co., Ltd.