RF98 datasheet(31/121 Pages) HOPE

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Page 31

RF96/97/98

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WIRELESS & SENSING

PRELIMINARY

DATASHEET

4.1.3. Operation of the LoRa

TM Modem

4.1.3.1. Operating Mode Control

The operating modes of the LoRaTM modem are accessed by enabling LoRaTM mode (setting the LongRangeMode bit of

RegOpMode

). Depending upon the operating mode selected the range of functionality and register access is given by the

following table:

Table 61 LoRa

TM Operating Mode Functionality

Operating Mode

Description

SLEEP

Low-power mode. In this mode only SPI and configuration registers are accessible. Lora FIFO is not

accessible.

Note that this is the only mode permissible to switch between FSK/OOK mode and LoRa mode.

STAND-BY

both Crystal oscillator and Lora baseband blocks are turned on.RF part and PLLs are disabled

FSTX

This is a frequency synthesis mode for transmission. The PLL selected for transmission is locked and active

at the transmit frequency. The RF part is off.

FSRX

This is a frequency synthesis mode for reception. The PLL selected for reception is locked and active at the

receive frequency. The RF part is off.

When activated the RF96/97/98 powers all remaining blocks required for transmit, ramps the PA, transmits

the packet and returns to Stand-by mode.

RXCONTINUOUS

When activated the RF96/97/98 powers all remaining blocks required for reception, processing all

received data until a new user request is made to change operating mode.

RXSINGLE

When activated the RF96/97/98 powers all remaining blocks required for reception, remains in this state

until a valid packet has been received and then returns to Stand-by mode.

CAD

When in CAD mode, the device will check a given channel to detect LoRa preamble signal

It is possible to access any mode from any other mode by changing the value in the RegOpMode register.

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