RFM119W/RFM119SW

Rev 1.0 | Page 16 /19

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Command

Descriptions

as shown in Figure 20.

3.

When the device is configured as Transmission Enabled by DATA Pin Rising Edge, the default state of

TWI_OFF

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.

SOFT_RST

Implemented by clocking in 0xBD01, 16 clock cycles in total.

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.

32 clock cycles 

16 clock cycles 

 

CLK

…

…

DATA

1  

0 

 

0x8D00  

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

CLK 

DATA 

 

16 clock cycles 

 

…

0x8D02  (TWI_OFF) 

 

 

 

 

Default 

State 

 

CLK 

DATA 

16 clock cycles 

 

…

0xBD01 (SOFT_RST) 

 

 

 

 

Default 

State 

 

 

Figure 22. TWI_OFF Command

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.

device to go to SLEEP is to issue TWI_RST and SOFT_RST commands right after the useful data is transmitted, instead of