RFM119W Datasheet, PDF (13/19 Pages) List of Unclassifed Manufacturers – Low-Cost Consumer Electronics Applications

W
RFM119W/RFM119SW
5.6. Working States and Transmission Control Interface
The RFM119W/S has following 4 different working states: SLEEP, XO-STARTUP, TUNE and TRANSMIT.
SLEEP
When the RFM119W/RFM119SW is in the SLEEP state, all the internal blocks are turned off and the current consumption is
minimized to
20 nA typically.
XO-STARTUP
After detecting a valid control signal on DATA pin, the RFM119W/RFM119SW goes into the XO-STARTUP state, and the
internal XO starts to work. The valid control signal can be a rising or falling edge on the DATA pin, which can be configured on
the RFPDK. The ^{host MCU has to wait for the t}XTAL ^{to allow the XO to get stable. The t}XTAL ^{is to a large degree crystal}
dependent. A typical value of t_XTAL is provided in the Table 11.
TUNE
The frequency synthesizer will tune the RFM119W/RFM119SW to the desired frequency in the time t_TUNE. The PA can be
turned on to _{transmit the incoming data only after the TUNE state is done, before that the incoming data will not be transmitted.}
See Figure
16 and Figure 17 for the details.
TRANSMIT
The RFM119W/RFM119SW starts to modulate and transmit the data coming from the DATA pin. The transmission can be
ended in 2 ^{methods: firstly, driving the DATA pin low for t}STOP ^{time, where the t}STOP ^{can be configured from 20 to 90 ms on the}
RFPDK; _{secondly, issuing SOFT_RST command over the two-wire interface, this will stop the transmission in 1 ms. See}
Section 6.2.3 for details of the two-wire interface.
Table 11.Timing in Different Working States
Parameter
Symbol
Min
Typ
XTAL Startup Time ^[1]
t_XTAL
400
Time to Tune to Desired Frequency
t_TUNE
370
Hold Time After Rising Edge
t_HOLD
10
Time to Stop the Transmission^[2]
t_STOP
2
Notes:
[1]. This parameter is to a large degree crystal dependent.
[2]. Configurable from 2 to 9 in 1 ms step size and 20 to 90 ms in 10 ms step size.
Max
Unit
us
us
ns
90
ms
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