RFM42B datasheet(13/56 Pages) ETC2

13 / 56 page

RFM42B/43B

3.2. Operating Mode Control

There are three primary states in the RFM42B/43B radio state machine: SHUTDOWN, IDLE, and TX (see

Figure 5). The SHUTDOWN state completely shuts down the radio to minimize current consumption. There are five

different configurations/options for the IDLE state which can be selected to optimize the chip to the applications

needs. "Register 07h. Operating Mode and Function Control 1" controls which operating mode/state is selected

with the exception of SHUTDOWN which is controlled by SDN pin. The TX state may be reached automatically

from any of the IDLE states by setting the txon bit in "Register 07h. Operating Mode and Function Control 1."

Table 10 shows each of the operating modes with the time required to reach TX mode as well as the current

consumption of each mode.

The RFM42B/43B includes a low-power digital regulated supply (LPLDO) which is internally connected in parallel

to the output of the main digital regulator (and is available externally at the VR_DIG pin). This common digital

supply voltage is connected to all digital circuit blocks including the SPI and register space. The LPLDO has

extremely low quiescent current consumption but limited current supply capability; it is used only in the IDLE-

STANDBY and IDLE-SLEEP modes. The main digital regulator is automatically enabled in all other modes.

Figure 5. State Machine Diagram

Table 10. Operating Modes Response Time

State/Mode

Response Time to TX

Current in State/Mode [µA]

Shut Down State

16.8 ms

15 nA

Idle States:

Standby Mode

Sleep Mode

Sensor Mode

Ready Mode

Tune Mode

800 µs

200 µs

450 nA

1µA

800 µA

8.5 mA

TX State

RFM42B:

85 mA @ +20 dBm,

RFM43B:

30 mA @ +13 dBm

SHUT DWN

IDLE*

*Five Different Options for IDLE

SHUTDOWN

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