RFM95 Datasheet, PDF (50/121 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

WIRELESS & SENSING
RFM95/96/97/98(W)
PRELIMINARY
DATASHEET
4.2.4. Operating Modes in FSK/OOK Mode
The RFM95/96/97/98(W) has several working modes, manually programmed in RegOpMode. Fully automated mode
selection, packet transmission and reception is also possible using the Top Level Sequencer described in Section 4.2.8.
Table 67 Basic Transceiver Modes
Mode
000
001
010
011
100
101
Selected mode
Sleep mode
Standby mode
Frequency synthesiser to Tx
frequency
Transmit mode
Frequency synthesiser to Rx
frequency
Receive mode
Symbol
Sleep
Stdby
Enabled blocks
None
Top regulator and crystal oscillator
FSTx
Frequency synthesizer at Tx frequency (Frf)
Tx
Frequency synthesizer and transmitter
FSRx
Frequency synthesizer at frequency for reception (Frf-IF)
Rx
Frequency synthesizer and receiver
When switching from a mode to another the sub-blocks are woken up according to a pre-defined optimized sequence.
4.2.5. Startup Times
The startup time of the transmitter or the receiver is dependant upon which mode the transceiver was in at the beginning.
For a complete description, Figure 17 below shows a complete startup process, from the lower power mode “Sleep”.
Current
Drain
IDDR (Rx) or IDDT (Tx)
IDDSL
0
IDDST
TS_OSC
IDDFS
TS_OSC
+TS_FS
Sleep
mode
Stdby
mode
FSTx
FSRx
TS_OSC
+TS_FS
+TS_TR
TS_OSC
+TS_FS
+TS_RE
Transmit
Timeline
Receive
Figure 17. Startup Process
TS_OSC is the startup time of the crystal oscillator which depends on the electrical characteristics of the crystal. TS_FS is
the startup time of the PLL including systematic calibration of the VCO.
Typical values of TS_OSC and TS_FS are given in Section 2.3.
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