RFM119SW datasheet(13/19 Pages) HOPE

13 / 19 page

RFM119W/RFM119SW

Rev 1.0 | Page 13 /19

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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 tXTAL to allow the XO to get stable. The tXTAL is to a large degree crystal

dependent. A typical value of tXTAL is provided in the Table 11.

TUNE

The frequency synthesizer will tune the RFM119W/RFM119SW to the desired frequency in the time tTUNE. 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 tSTOP time, where the tSTOP 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

Max

Unit

XTAL Startup Time [1]

tXTAL

400

Time to Tune to Desired Frequency

tTUNE

370

Hold Time After Rising Edge

tHOLD

Time to Stop the Transmission[2]

tSTOP

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.

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