RFM66W Datasheet, PDF (38/87 Pages) List of Unclassifed Manufacturers – 868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

WIRELESS & SENSING
RFM66W
DATASHEET
4. Operating Modes
4.1. General Overview
The RFM66W 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 4.3.
Table 20 Basic Transceiver Modes
Mode
000
001
010
011
100
101
Selected mode
Sleep mode
Standby mode
FSTx: Frequency synthesiser to Tx frequency
Transmit mode (Tx)
FSRx: Frequency synthesiser to Rx frequency
Receive mode (Rx)
Enabled blocks
None
Top regulator and crystal oscillator
Frequency synthesizer at Tx frequency (Frf)
Frequency synthesizer and transmitter
Frequency synthesizer at frequency for reception (Frf-IF)
Frequency synthesizer and receiver
When switching from a mode to another one, the sub-blocks are woken up according to a pre-defined and optimized
sequence.
4.2. 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 15 below shows a complete startup process, from the lower power mode “Sleep”.
Duration: TS_FS
Current drain: IDDFS
FSTx
Duration: TS_TR
Current drain: IDDT
Transmit
Sleep
mode
Duration: TS_OSC
Current drain: IDDST
Stdby
mode
Duration: TS_FS
Current drain: IDDFS
FSRx
Duration: TS_RE
Current drain: IDDR
Receive
Figure 15. Startup Process
TS_OSC is the startup time of the crystal oscillator, and mainly depends on the characteristics of the crystal itself. TS_FS is
the startup time of the PLL, and it includes a systematic calibration of the VCO.
Typical values of TS_OSC and TS_FS are given in section 2.3.
Tel: [phone] Fax: [phone] E-mail: [e-mail] http://www.hoperf.com
Page 38