RF63 datasheet(27/91 Pages) ETC2

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ADVANCED COMMUNICATIONS & SENSING

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RF63

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In OOK mode, the RSSI evaluates the signal strength by sampling I(t) and Q(t) signals 16 times in each period of

the chosen IF2 frequency (refer to section 3.4.1). In FSK mode, the signals are sampled 16 times in each Fdev

period, Fdev being the frequency deviation of the companion transmitter. An average is then performed over a

sliding window of 16 samples. Hence, the RSSI output register RXParam_RSSI is updated 16 times in each Fdev

or IF2 period.

The following settings should be respected:

•

FSK Mode: Ensure that the Fdev parameter (as described in MCParam_Fdev) remains consistent with the

actual frequency deviation of the companion transmitter.

•

OOK reception: Ensure that the Fdev parameter (as described in MCParam_Fdev) is equal with the frequency

of I(t) and Q(t) signals, i.e. the second Intermediate Frequency, IF2, of the receiver (Note that this equals Fo,

the center frequency of the polyphase filter).

3.4.7.3. Dynamic Range

The dynamic range of the RSSI is over 70 dB, extending from the nominal sensitivity level. The IF gain setting

available in MCParam_IF_gain is used to achieve this dynamic range:

RSSI Response

180

160

140

120

100

-120

-100

-80

-60

-40

-20

Pin [dBm]

IF_Gain=00

IF_Gain=01

IF_Gain=10

IF_Gain=11

Figure 20: RSSI Dynamic Range

The RSSI response versus input signal is independent of the receiver filter bandwidth. However in the absence of

any input signal, the minimum value directly reflects upon the noise floor of the receiver, which is dependant on the

filter bandwidth of the receiver.

3.4.7.4. RSSI IRQ Source

The RF63 can also be used to detect a RSSI level above a pre-configured threshold. The threshold is set in

IRQParam_RSSI_irq_thresh and the IRQ status stored in IRQParam_RSSI_irq (cleared by writing a

“1”).

interrupt

can

mapped

the

IRQ0

IRQ1

pins

via

bits

IRQParam_Rx_stby_irq0

IRQParam_Rx_stby_irq1. Figure

shows

the

timing

diagram

the

RSSI

interrupt

source,

with

IRQParam_RSSI_irq_thresh set to 28.

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