4432-T-B1 B 915【PDF 21/47 页】KIT DEV TEST EZRADIOPRO SI4432

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Si4430/31/32-B1

Rev 1.1

3.2.1. SHUTDOWN State

The SHUTDOWN state is the lowest current consumption state of the device with nominally less than 15 nA of

current consumption. The shutdown state may be entered by driving the SDN pin (Pin 20) 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 chip is connected to the power supply, a POR will be initiated after the falling edge of SDN.

3.2.2. IDLE State

There are five 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/RX mode.

This tradeoff is shown in Table 11. After the POR event, SWRESET, or exiting from the SHUTDOWN state the chip

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 of the five IDLE states 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 "8.6. Wake-Up Timer and 32 kHz Clock Source" on page 56 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 in "Register 07h.

Operating Mode and Function Control 1". See "8.4. Temperature Sensor" on page 53 and "8.5. Low Battery

Detector" on page 55 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 the minimum 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 TX or RX 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 in Register 62h. Crystal Oscillator Control and Test. 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 spread spectrum systems (FHSS). 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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