RFM219SW Datasheet, PDF (20/35 Pages) List of Unclassifed Manufacturers – Wireless Alarm and Security Systems

RFM219SW
Turn on the radio (Forwards)
PUP
SLEEP
STBY
TUNE
RX
EEPROM
Turn off the radio (Backwards)
Figure 17. Device Operating State Machine
The below figure shows the switching time for a typical receive cycle, starting from the SLEEP mode. The power consumption is
also shown in the figure. They are measured when the device works in 868.35 MHz using FSK demodulation, with the Sleep
Timer turned off.
Current
5.7 mA
2.0 mA
520 uA
100 nA
SLEEP
Wait for XTAL to get stable
Time = Xtal Stabilizing Time <= 2.5 ms
STBY
Wait for PLL to settle
Time = 300 us
TUNE
Wait for RF to settle
Time = 20 us
Send go_stby to switch to STBY
Send go_tune to switch to FS
Send go_rx to switch to RX
RX
Receive incoming data
Time determined by MCU, Rx Timer,
or receiving status
Can switch to any other state
Time
Figure 18. Timing and Power from SLEEP to RX state
Power Up (PUP) State
Once the device is powered up, it will go through the Power Up (PUP) sequence which includes the task of releasing the
Power-On Reset (POR), turning on the crystal and calibrating the internal blocks. The PUP takes about 9.5 ms to finish. After that
the device is automatically switched to the SLEEP state.
SLEEP State
Most of the internal blocks are powered down including the crystal oscillator to save power. The SPI interface and control
registers are accessible. The FIFO is not accessible. The optional LPOSC and sleep timer can be turned on if the parameter of
‘Sleep Timer On-Off’ is set to ‘On’ on the RFPDK. The sleep current is less than 60 nA when the sleep timer is turned off and 440
nA when it is turned on.
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