Silicon Laboratories SI4421 manual Si4421, Control Commands, Control Register Default Values

Si4421

Control Commands

	Control Command		Related Parameters/Functions		Related control bits
1	Configuration Setting Command		Frequency band, crystal oscillator load capacitance,		el, ef, b1 to b0, x3 to x0
			RX FIFO and TX register enable
			Receiver/Transmitter mode change,	synthesizer,
2	Power Management Command		crystal oscillator, PA, wake-up timer,	clock output	er, ebb, et, es, ex, eb, ew, dc
			enable
3	Frequency Setting Command	Frequency of the local oscillator/carrier signal			f11 to f0
4	Data Rate Command		Bit rate		cs, r6 to r0
5	Receiver Control Command		Function of pin 16, Valid Data Indicator, baseband		p16, d1 to d0, i2 to i0, g1 to g0, r2
			bandwidth, LNA gain, digital RSSI threshold		to r0
6	Data Filter Command		Data filter type, clock recovery parameters		al, ml, s, f2 to f0
7	FIFO and Reset Mode Command		Data FIFO IT level, FIFO start control, FIFO enable		f3 to f0, sp, ff, al, dr
			and FIFO fill enable, POR sensitivity
8	Synchron Pattern Command	Synchron pattern			b7 to b0
9	Receiver FIFO Read Command	RX FIFO read
10	AFC Command	AFC parameters			a1 to a0, rl1 to rl0, st, fi, oe, en
11	TX Configuration Control Command	Modulation parameters, output power			mp, m3 to m0, p2 to p0
12	PLL Setting Command	CLK out buffer speed, dithering, PLL bandwidth			ob1 to ob0, ddit, dly, bw0
13	Transmitter Register Write Command	TX data register write			t7 to t0
14	Wake-Up Timer Command	Wake-up time period			r4 to r0, m7 to m0
15	Low Duty-Cycle Command		Enable and set low duty-cycle mode		d6 to d0, en
	Low Battery Detector and
16	Microcontroller Clock Divider	LBD voltage and microcontroller clock division ratio			d2 to d0, v3 to v0
	Command
17	Status Read Command	Status bit readout

In general, setting the given bit to one will activate the related function. In the following tables, the POR column shows the default values of the command registers after power-on.

Control Register Default Values

	Control Register	Power-On Reset Value
1	Configuration Setting Command	8008h
2	Power Management Command	8208h
3	Frequency Setting Command	A680h
4	Data Rate Command	C623h
5	Receiver Control Command	9080h
6	Data Filter Command	C22Ch
7	FIFO and Reset Mode Command	CA80h
8	Synchron Pattern Command	CED4h
9	Receiver FIFO Read Command	B000h
10	AFC Command	C4F7h
11	TX Configuration Control Command	9800h
12	PLL Setting Command	CC77h
13	Transmitter Register Write Command	B8AAh
14	Wake-Up Timer Command	E196h
15	Low Duty-Cycle Command	C80Eh
16	Low Battery Detector and Microcontroller Clock Divider Command	C000h
17	Status Read Command	0000h

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