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Si4420
Control Commands
Control Command
Related Parameters/Functions
Related control bits
1
Configuration Setting Command
Frequency band, crystal oscillator load capacitance,
TX register, RX FIFO
el, ef, b1 to b0, x3 to x0
Receiver/Transmitter mode change, synthesizer, xtal
2
Power Management Command
osc, PA, wake-up timer, clock output can be enabled
er, ebb, et, es, ex, eb, ew, dc
here
3
4
5
6
7
8
9
10
11
12
13
Frequency Setting Command
Data Rate Command
Receiver Control Command
Data Filter Command
FIFO and Reset Mode Command
Receiver FIFO Read Command
AFC Command
TX Configuration Control Command
Transmitter Register Write Command
Wake-Up Timer Command
Low Duty-Cycle Command
Frequency of the local oscillator/carrier signal
Bit rate
Function of pin 16, Valid Data Indicator, baseband
bw, LNA gain, digital RSSI threshold
Data filter type, clock recovery parameters
Data FIFO IT level, FIFO start control, FIFO enable
and FIFO fill enable
RX FIFO can be read with this command
AFC parameters
Modulation parameters, output power, ea
TX data register can be written with this command
Wake-up time period
Enable low duty-cycle mode. Set duty-cycle.
f11 to f0
cs, r6 to r0
p16, d1 to d0, i2 to i0, g1 to g0, r2
to r0
al, ml, s, f2 to f0
f3 to f0, al, ff, dr
a1 to a0, rl1 to rl0, st, fi, oe, en
mp, m3 to m0, p2 to p0
t7 to t0
r4 to r0, m7 to m0
d6 to d0, en
Low Battery Detector and
14
Microcontroller Clock Divider
LBD voltage and microcontroller clock division ratio
d2 to d0, v4 to v0
Command
15
Status Read Command
Status bits can be read out
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.
Description of the Control Commands
1. Configuration Setting Command
Bit
15
1
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
el
6
ef
5
b1
4
b0
3
x3
2
x2
1
x1
0
x0
POR
8008h
Bit el enables the internal data register. If the data register is used the FSK pin must be connected to logic high level.
Bit ef enables the FIFO mode. If ef =0 then DATA (pin 6) and DCLK (pin 7) are used for data and data clock output.
b1
0
0
1
1
b0
0
1
0
1
Frequency Band {MHz]
315
433
868
915
x3
0
0
0
0
x2
0
0
0
0
x1
0
0
1
1
x0
0
1
0
1
Crystal Load Capacitance [pF]
8.5
9.0
9.5
10.0
…
1
1
1
1
1
1
0
1
15.5
16.0
12
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