RFM110W Datasheet, PDF (19/22 Pages) List of Unclassifed Manufacturers – Low-Cost Consumer Electronics Applications

RFM110W/RFM117W
Command
TWI_OFF
Descriptions
as shown in Figure 20.
3. When the device is configured as Transmission Enabled by DATA Pin Rising Edge, the default state of
the DATA is low, there is no t_CD requirement, as shown in Figure 21.
Implemented by clocking in 0x8D02, 16 clock cycles in total.
It turns off the TWI circuit, and the DATA pin is able to detect the Rising/Falling edge to trigger transmission
after this command, till the TWI_RST command is issued. The command is shown as Figure 22.
Implemented by clocking in 0xBD01, 16 clock cycles in total.
SOFT_RST
It resets all the other circuits of the chip except the TWI circuit. This command will trigger internal calibration
for getting the optimal device performance. After issuing the SOFT_RST command, the host MCU should
wait 1 ms before sending in any new command. After that, the device goes to SLEEP state. The command is
shown as Figure 23.
CLK
tCD
DATA 1
32 clock cycles
…
0
16 clock cycles
…
0x8D00
tDD
1
Figure 20. TWI_RST Command When Transmission Enabled by DATA Pin Falling Edge
32 clock cycles
16 clock cycles
CLK
…
…
DATA
0
0x8D00
0
Figure 21. TWI_RST Command When Transmission Enabled by DATA Pin Rising Edge
16 clock cycles
CLK
DATA
…
0x8D02 (TWI_OFF)
tDD
Default
State
Figure 22. TWI_OFF Command
16 clock cycles
CLK
DATA
…
0xBD01 (SOFT_RST)
tDD
Default
State
Figure 23. SOFT_RST Command
The DATA is generated by the host MCU on the rising edge of CLK, and is sampled by the device on the falling edge. The CLK
should be pulled up by the host MCU during the TRANSMISSION shown in Figure 19. The TRANSMISSION process should
refer to Figure 16 or Figure 17 for its timing requirement, depending on the “Start By” setting configured on the RFPDK.
The device will go to SLEEP state by driving the DATA low for t_STOP, or issuing SOFT_RST command. A helpful practice for the
device to go to SLEEP is to issue TWI_RST and SOFT_RST commands right after the useful data is transmitted, instead of
waiting the t_STOP, this can save power significantly.
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