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XE1205
The time diagram of an RSSI measurement is given in Figure 5. When the RSSI function has been activated the signal
strength is periodically measured and the result is stored in RSSI_out_int; this result is transferred to the register
RXParam_RSSI_out(1:0) each time this register is read via the SPI interface. TS_RSSI is the wake-up time required
after the function has been activated to get a valid result and its value is given in section 4.2.2. TS_RSSIM is the period
between two successive measurements and its value depends on the selected frequency deviation (100 μ s for Δ f > 20
kHz, 200 μ s for 10 kHz < Δ f ≤ 20 kHz, 300 μ s for 7 kHz < Δ f ≤ 10 kHz, 400 μ s for 5 kHz < Δ f ≤ 7 kHz, and 500 μ s Δ f ≤ 5
kHz).
RXParam_RSSI
Read RSSI
Read RSSI
NSS_CONFIG
T S_RSS I
TS_RSSIM
RSSI_out_int
xxx
val1
val2
val3
val4
0
saout_rssi
RXParam_RSSI_out
xxx
val1
val4
Figure 5: RSSI measurement timing diagram
Saout_rssi is internally generated during a read sequence of RXParam_RSSI_out register.
The RSSI block can also be used in interrupt mode by setting the bit IRQParam_RSSI_int to 1. When RSSI_out_int is
equal or greater than a predefined value stored in IRQParam_RSSI_thr(1:0), the signal IRQParam_RSSI_signal_detect
(can be read in the Configuration register) goes high and an interrupt signal RSSI_irq is generated. This interrupt signal
can be used by a microcontroller if IRQParam_RX_irq_0 is set to “01” (see table 5).The interrupt is cleared by writing a 1
to the bit IRQParam_RSSI_signal_detect. If the bit IRQParam_RSSI_int remains high, the process starts again. The next
figure shows the timing diagram of RSSI in interrupt mode.
IRQParam_RSSI_int
RSSI_out_int
00
00
00
10
10
00
00
00
00
00
11
10
00
10
10 11
00
IRQParam_RSSI_signal_detect
IRQParam_RSSI_thr = “10”
Clear interrupt
RSSI_irq
Figure 6: RSSI generating interrupt signal when detecting a threshold
? Semtech 2008
12
www.semtech.com
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