RFM213W Datasheet, PDF (16/20 Pages) List of Unclassifed Manufacturers – Low-Cost Consumer Electronics Applications

RFM213W
RX State
The device receives the incoming signals and outputs the demodulated data from the DOUT pin. In duty-cycle receive mode, the
device only stays in the RX State for a certain amount of time, which is defined by the option “Rx Time” on the RFPDK. The
current in this state is about 3.8 mA.
5.7 Always Receive Mode
If the duty-cycle receive mode is turned off, the device will go through the Power Up (PUP) sequence, stay in the SLEEP state for
about 3 ms, tune the receive frequency, and finally stay in the RX state until the device is powered down. The power up sequence,
which takes about 4 ms to finish, includes the task of turning on the crystal and calibrating the internal blocks. The device will
continuously receive the incoming RF signals during the RX state and send out the demodulated data on the DOUT pin. The
configurable system clock is also output from the CLKO pin if it is enabled in the Advanced Mode on the RFPDK. The figure
below shows the timing characteristics and current consumption of the device from the PUP to RX.
Data
(DOUT pin)
System Clock
(CLKO pin)
Current
3.8 mA
900 uA
PUP
about 4 ms
2.0 mA
440 nA
SLEEP TUNE RX
about
3 ms
about
300 us
State
Figure 13. Timing and Current Consumption for Always Receive Mode
5.8 Duty-Cycle Receive Mode
If the duty-cycle mode is turned on, after the PUP the device will automatically repeat the sequence of SLEEP, XTAL, TUNE and
RX until the device is powered down. This allows the device to re-tune the synthesizer regularly to adept to the changeable
environment and therefore remain its highest performance. The device will continuously receive any incoming signals during the
RX state and send out the demodulated data on the DOUT pin. The configurable system clock output is output from the CLKO
pin during the TUNE and RX state. The PUP sequence consumes about 9.5 ms which is longer than the 4 ms in the Always
Receive Mode. This is because the LPOSC, which drives the sleep timer, must be calibrated during the PUP.
Data
(DOUT pin)
System Clock
(CLKO pin)
Current
3.8 mA
3.8 mA
900 uA
PUP
about 9.5 ms
2.0 mA
440 nA ^{520 uA}
SLEEP XTAL TUNE
Sleep
Time
Xtal Stabilizing
Time
about
300 us
RX
Rx Time
2.0 mA
440 nA ^{520 uA}
SLEEP XTAL TUNE RX State
Sleep
Time
Xtal Stabilizing
Time
about
300 us
Rx Time
Figure 14. Timing and Current Consumption for Duty-Cycle Receive Mode
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