Data Sheet

Page 52
RFM95/96/97/98(W)
Tel: + 86-755-82973805 Fax: + 86- 755-82973550 E-mail: [e-mail] http:/ / www.hoperf.com
Tx Mode
Rx Mode
WIRELESS & SENSING PRELIMINARY DATASHEET
4.2.5.3. Time to RSSI Evaluation
The first RSSI sample will be available TS_RSSI after the receiver is ready, in other words TS_RE + TS_RSSI after the
receiver was requested to turn on.
Timeline
0 TS_RE TS_RE
+TS_RSSI
FSRx Rx
Rssi
IRQ
Rssi sample
ready
Figure 18. Time to Rssi Sample
TS_RSSI depends on the receiver bandwidth, as well as the RssiSmoothing option that was selected. The formula used to
calculate TS_RSSI is provided in section 2.5.4.
4.2.5.4. Tx to Rx Turnaround Time
Timeline
0 TS_HOP
+TS_RE
1. set new Frf (*)
2. set Rx
mode
Rx Mode
(*) Optional
Figure 19. Tx to Rx Turnaround
Note The SPI instruction times are omitted, as they can generally be very small as compared to other timings (up to
10MHz SPI clock).
4.2.5.5. Rx to Tx
Timeline
0 TS_HOP
+TS_TR
1. set new Frf (*)
2. set Tx
mode
Tx Mode
(*) Optional
Figure 20. Rx to Tx Turnaround