RFM31 Datasheet, PDF (16/137 Pages) –

RFM31
1. Enable the Main Digital LDO and the Analog LDOs.
2. Start up crystal oscillator and wait until ready (controlled by timer).
3. Enable PLL.
4. Calibrate VCO (this action is skipped when the vcocal bit is ―0‖, default value is ―1‖).
5. Wait until PLL settles to required transmit frequency (controlled by timer).
6. Enable receive circuits: LNA, mixers, and ADC.
7. Calibrate ADC (RC calibration).
8. 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.
3.2.4. Device Status
Add R/W Function/Description D7 D6 D5
02
R
Device Status
ffovfl ffunfl rxffem
D4
D3 D2 D1
D0
POR Def.
headerr
cps[1] cps[0]
—
The operational status of the module can be read from "Register 02h. Device Status".
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