RFM95 Datasheet, PDF (52/121 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

WIRELESS & SENSING
RFM95/96/97/98(W)
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.
0
FSRx
TS_RE
Rx
Timeline
TS_RE
+TS_RSSI
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
0
Tx Mode
1. set new Frf (*)
2. set Rx mode
Timeline
TS_HOP
+TS_RE
Rx Mode
(*) Optional
Note
Figure 19. Tx to Rx Turnaround
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
0
Rx Mode
1. set new Frf (*)
2. set Tx mode
Timeline
TS_HOP
+TS_TR
Tx Mode
(*) Optional
Figure 20. Rx to Tx Turnaround
Page 52
Tel: [phone] Fax: [phone] E-mail: [e-mail] http:/ / www.hoperf.com