RF64W datasheet(28/76 Pages) HOPE

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ADVANCED COMMUNICATIONS & SENSING

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RF64

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RXParam_RSSI_val(7:0)

24 26

25 20

20 18

22 33

22 34

IRQParam_RSSI_irq

Clear interrupt

Figure 21: RSSI IRQ Timings

3.4.8. Fdev Setting in Receive Mode

The effect of the Fdev setting is different between FSK and OOK modes:

3.4.8.1. FSK Rx Mode

In FSK mode the Fdev setting, as configured by MCParam_Freq_Dev, sets sampling frequencies on the receiver.

The user should make it consistent with the frequency deviation of the FSK signal that is received.

3.4.8.2. OOK Rx Mode

The frequency deviation Fdev, as described above, sets the sampling rate of the RSSI block. It is therefore

necessary to set Fdev to the recommended low-IF frequency, IF2, of 100 kHz:

3.4.9. FSK Demodulator

The FSK demodulator provides data polarity information, based on the relative phase of the input I and Q signals at

the baseband. Its outputs can be fed to the Bit Synchronizer to recover the timing information. The user can also

use the raw, unsynchronized, output of the FSK demodulator in Continuous mode.

The FSK demodulator of the RF64 operates most effectively for FSK signals with a modulation index greater

than or equal to two:

3.4.10. OOK Demodulator

The OOK demodulator performs a comparison of the RSSI output and a threshold value. Three different threshold

modes are available, programmed through the RXParam_OOK_thresh_type register.

The recommended mode of operatio

n is the “Peak” threshold mode, illustrated below in Figure 22:

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