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Si4020
 
 
13
 
Control Commands
 
Control Command
Related Parameters/Functions
1     Configuration Setting Command
Frequency band, microcontroller clock output, crystal load capacitance, frequency
deviation
2     Power Management Command
Crystal oscillator, synthesizer, power amplifier, low battery detector, wake-up timer, clock
output buffer
3     Frequency Setting Command
Carrier frequency
4     Data Rate Command
Bit rate (at EEPROM mode only)
5     Power Setting Command
Nominal output power, OOK mode
6     Low Battery Detector Command
Low battery threshold limit
7     Sleep Command
Length of the clock tail after power down
8     Push-Button Command
Push-button related functions
9     Wake-Up Timer Command
Wake-up time period
10    Data Transmit Command
Data transmission
11    Status Register Command
Transmitter status read
Note: In the following tables the POR column shows the default values of the command registers after power-on.
1. Configuration Setting Command
bit     15     14     13     12     11     10
9
8
7
6
5
4
3
2
1
0
POR
 
1
0
0
b1     b0     d2     d1     d0     x3     x2     x1     x0     ms    m2    m1    m0
8080h
 
b1     b0     Frequency Band [MHz]
0
0
315
0
1
433
1
0
868
1
1
915
 
d2    d1    d0
Clock Output Frequency
[MHz]
0
0
0
1
0
0
1
1.25
0
1
0
1.66
0
1
1
2
1
0
0
2.5
1
0
1
3.33
1
1
0
5
1
1
1
10
 
x3    x2    x1    x0    Crystal Load Capacitance [pF]
0     0     0     0
8.5
0     0     0     1
9.0
0     0     1     0
9.5
0     0     1     1
10.0
&
1     1     1     0
15.5
1     1     1     1
16.0
 
The resulting output frequency can be calculated as:
f
out
 = f
0
  (-1)
SIGN
 * (M + 1) * (30 kHz)
where:
f
0
 is the channel center frequency (see the next command)
M is the three bit binary number <m2 : m0>
SIGN = (ms) XOR (FSK input)
 
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