4432-T-B1 B 915【PDF 22/47 页】KIT DEV TEST EZRADIOPRO SI4432

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Si4430/31/32-B1

Rev 1.1

3.2.3. TX State

The TX state may be entered from any of the IDLE modes when the txon bit is set to 1 in "Register 07h. Operating

Mode and Function Control 1". A built-in sequencer takes care of all the actions required to transition between

states from enabling the crystal oscillator to ramping up the PA. The following sequence of events will occur

automatically when going from STANDBY mode to TX mode by setting the txon bit.

1. Enable the main digital LDO and the Analog LDOs.

2. Start up crystal oscillator and wait until ready (controlled byan internal timer).

3. Enable PLL.

4. Calibrate VCO (this action is skipped when the skipvco bit is 1, default value is 0).

5. Wait until PLL settles to required transmit frequency (controlled by an internal timer).

6. Activate power amplifier and wait until power ramping is completed (controlled by an internal timer).

7. Transmit packet.

Steps in this sequence may be eliminated depending on which IDLE mode the chip is configured to prior to setting

the txon bit. By default, the VCO and PLL are calibrated every time the PLL is enabled.

3.2.4. RX State

The RX state may be entered from any of the IDLE modes when the rxon bit is set to 1 in "Register 07h. Operating

Mode and Function Control 1". A built-in sequencer takes care of all the actions required to transition from one of

the IDLE modes to the RX state. The following sequence of events will occur automatically to get the chip into RX

mode when going from STANDBY mode to RX mode by setting the rxon bit:

1. Enable the main digital LDO and the Analog LDOs.

2. Start up crystal oscillator and wait until ready (controlled by an internal timer).

3. Enable PLL.

4. Calibrate VCO (this action is skipped when the skipvco bit is 1, default value is 0).

5. Wait until PLL settles to required receive frequency (controlled by an internal timer).

6. Enable receive circuits: LNA, mixers, and ADC.

7. Enable receive mode in the digital modem.

Depending on the configuration of the radio all or some of the following functions will be performed automatically by

the digital modem: AGC, AFC (optional), update status registers, bit synchronization, packet handling (optional)

including sync word, header check, and CRC.

3.2.5. Device Status

The operational status of the chip can be read from "Register 02h. Device Status".

Add R/W Function/Description

D0 POR Def.

Device Status

ffovfl ffunfl

rxffem

headerr

freqerr

cps[1] cps[0]

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