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Si4421
Control Commands
Control Command
Related Parameters/Functions
Related control bits
1
Configuration Setting Command
Frequency band, crystal oscillator load capacitance,
RX FIFO and TX register enable
el , ef , b1 to b0 , x3 to x0
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
4
5
6
7
8
9
10
11
12
13
14
15
Frequency Setting Command
Data Rate Command
Receiver Control Command
Data Filter Command
FIFO and Reset Mode Command
Synchron Pattern Command
Receiver FIFO Read Command
AFC Command
TX Configuration Control Command
PLL Setting 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
bandwidth, LNA gain, digital RSSI threshold
Data filter type, clock recovery parameters
Data FIFO IT level, FIFO start control, FIFO enable
and FIFO fill enable, POR sensitivity
Synchron pattern
RX FIFO read
AFC parameters
Modulation parameters, output power
CLK out buffer speed, dithering, PLL bandwidth
TX data register write
Wake-up time period
Enable and set low duty-cycle mode
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 , sp , ff , al , dr
b7 to b0
a1 to a0 , rl1 to rl0 , st , fi , oe , en
mp , m3 to m0 , p2 to p0
ob1 to ob0 , ddit , dly , bw0
t7 to t0
r4 to r0 , m7 to m0
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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Configuration Setting Command
Power Management Command
Frequency Setting Command
Data Rate Command
Receiver Control Command
Data Filter Command
FIFO and Reset Mode Command
Synchron Pattern Command
Receiver FIFO Read Command
AFC Command
TX Configuration Control Command
PLL Setting Command
Transmitter Register Write Command
Wake-Up Timer Command
Low Duty-Cycle Command
Low Battery Detector and Microcontroller Clock Divider Command
Status Read Command
8008h
8208h
A680h
C623h
9080h
C22Ch
CA80h
CED4h
B000h
C4F7h
9800h
CC77h
B8AAh
E196h
C80Eh
C000h
0000h
14
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