RF42/43
3.2. Operating Mode Control
There are three primary states in the RF42/43 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.
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 output of the LPLDO 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 digital modem, crystal oscillator, and 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.
RF42:
RF43:
15
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