RFM219SW

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STBY State

The crystal oscillator is turned on. The frequency synthesizer and RF front-end are turned off. The FIFO contents retain in the

STBY state. If the sleep timer is turned on, after the sleep timer timeout the chip is automatically switched to the STBY state and

waits for the MCU’s commands. It takes the time defined by the “Xtal Stabilizing Time” on the RFPDK for the device to switch

from the SLEEP state to the STBY state. The power consumption is about 520 uA in the STBY state.

TUNE State

The frequency synthesizer (PLL) is tuned and locked to the desired frequency. The RF front-end is turned off. The FIFO contents

retain in the TUNE state. It takes about 300 us to switch from the STBY state to the TUNE state. The power consumption is about

2 mA in the TUNE state.

RX State

All the blocks are turned on. The chip will receive the incoming signals, output the demodulated data from the GPO pin which is

configured as DOUT or perform the data decoding and buffering with the packet handler and the FIFO. The power consumption

of the RX state depends on the frequency band and the demodulation methods. It only takes about 20 us to switch from the

TUNE state to the RX state.

EEPROM State

This state is designed for the user to get access to the User Space of the EEPROM. The User Space is a 32-byte free space that

allows the users to store their own information. The User Space is independent from the Configuration Space which is used to

store all the parameters downloaded from the RFPDK. The details about how to get access to the User Space can be found in

the” AN136 Accessing the RFM219SW EEPROM”.

5.8 GPOs and Interrupts

Four General Purpose Outputs (GPOs) are available to use.

Pin

Name

I/O

Function

13

GPO1

O

Programmable output, options are: nRSTO (default), INT1, INT2 and DOUT

12

GPO2

O

Programmable output, options are: INT1 (default), INT2 and DCLK

9

GPO3

O

Programmable output, options are: CLKO (default), INT1, INT2 and DOUT

8

GPO4

O

Programmable output, options are: DOUT (default), INT1, INT2 and DCLK

The nRSTO and the CLKO are respectively the POR and clock output to drive the external MCU. They are designed to lower the

system application BOM. The DOUT is the demodulated data output and the DCLK is the sync clock output.

The INT1 and INT2 are the two interrupt outputs which response to multiple sources, as listed in table below.

Table 14. Interrupt Sources

Interrupts

Descriptions

Clearing Methods

RSSI_VLD

The RSSI valid interrupt

By External MCU

PREAM_VLD

The preamble detection interrupt

By External MCU

SYNC_PS

The sync word detection interrupt

By External MCU

NODE_PS

The node ID detection interrupt in packet mode

By External MCU

CRC_PS

The CRC validation successful interrupt in packet mode

By External MCU

PKT_DONE

The packet receiving done interrupt in packet mode

By External MCU

SL_TMO

The sleep timer timeout interrupt

By External MCU