RFM42 Datasheet, PDF (14/110 Pages) –

RFM42/43
3.2.1. Shutdown State
The shutdown state is the lowest current consumption state of the device with nominally less than 10 nA of current
consumption. The shutdown state may be entered by driving the SDN pin high. The SDN pin should be held low in all
states except the SHUTDOWN state. In the SHUTDOWN state, the contents of the registers are lost and there is no
SPI access.
When the module is connected to the power supply, a POR will be initiated after the falling edge of SDN.
3.2.2. Idle State
There are four different modes in the IDLE state which may be selected by "Register 07h. Operating Mode and
Function Control 1". All modes have a tradeoff between current consumption and response time to TX mode. This
tradeoff is shown in Table 10. After the POR event, SWRESET, or exiting from the SHUTDOWN state the module will
default to the IDLE-READY mode. After a POR event the interrupt registers must be read to properly enter the SLEEP,
SENSOR, or STANDBY mode and to control the 32 kHz clock correctly.
3.2.2.1. STANDBY Mode
STANDBY mode has the lowest current consumption possible with only the LPLDO enabled to maintain the register
values. In this mode the registers can be accessed in both read and write mode. The standby mode can be entered by
writing 0h to "Register 07h. Operating Mode and Function Control 1". If an interrupt has occurred (i.e., the nIRQ pin = 0)
the interrupt registers must be read to achieve the minimum current consumption. Additionally, the ADC should not be
selected as an input to the GPIO in this mode as it will cause excess current consumption.
3.2.2.2. SLEEP Mode
In SLEEP mode the LPLDO is enabled along with the Wake-Up-Timer, which can be used to accurately wake-up
the radio at specified intervals. See "7.6. Wake-Up Timer" for more information on the Wake-Up-Timer. Sleep mode
is entered by setting enwt = 1 (40h) in "Register 07h. Operating Mode and Function Control 1". If an interrupt has
occurred (i.e., the nIRQ pin = 0) the interrupt registers must be read to achieve the minimum current consumption. Also,
the ADC should not be selected as an input to the GPIO in this mode as it will cause excess current consumption.
3.2.2.3. SENSOR Mode
In SENSOR Mode either the Low Battery Detector, Temperature Sensor, or both may be enabled in addition to the
LPLDO and Wake-Up-Timer. The Low Battery Detector can be enabled by setting enlbd = 1 and the temperature
sensor can be enabled by setting ents = 1 in "Register 07h. Operating Mode and Function Control 1". See "7.4.
Temperature Sensor" and "7.5. Low Battery Detector" for more information on these features. If an interrupt has
occurred (i.e., the nIRQ pin = 0) the interrupt registers must be read to achieve theminimum current consumption.
3.2.2.4. READY Mode
READY Mode is designed to give a fast transition time to TX mode with reasonable current consumption. In this
mode the Crystal oscillator remains enabled reducing the time required to switch to the TX mode by eliminating the
crystal start-up time. Ready mode is entered by setting xton = 1 in "Register 07h. Operating Mode and Function
Control 1". To achieve the lowest current consumption state the crystal oscillator buffer should be disabled. This is
done by setting "Register 62h. Crystal Oscillator/Power-on-Reset Control" to a value of 02h. To exit ready mode,
bufovr (bit 1) of this register must be set back to 0.
3.2.2.5. TUNE Mode
In TUNE Mode the PLL remains enabled in addition to the other blocks enabled in the IDLE modes. This will give
the fastest response to TX mode as the PLL will remain locked but it results in the highest current consumption.
This mode of operation is designed for Frequency Hopping Systems (FHS). Tune mode is entered by setting pllon= 1
in "Register 07h. Operating Mode and Function Control 1". It is not necessary to set xton to 1 for this mode, the internal
state machine automatically enables the crystal oscillator.
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