Si4020
Control Commands
Control Command
Related Parameters/Functions
Frequency band, microcontroller clock output, crystal load capacitance, frequency
deviation
1
2
Configuration Setting Command
Crystal oscillator, synthesizer, power amplifier, low battery detector, wake-up timer, clock
output buffer
Power Management Command
3
4
5
6
7
8
9
Frequency Setting Command
Data Rate Command
Carrier frequency
Bit rate (at EEPROM mode only)
Nominal output power, OOK mode
Low battery threshold limit
Length of the clock tail after power down
Push-button related functions
Wake-up time period
Power Setting Command
Low Battery Detector Command
Sleep Command
Push-Button Command
Wake-Up Timer Command
10 Data Transmit Command
11 Status Register Command
Data transmission
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
1
14
0
13
0
12
b1
11
b0
10
d2
9
8
7
6
5
4
3
2
1
0
POR
d1
d0
x3
x2
x1
x0
ms
m2 m1 m0
8080h
b1
b0
0
Frequency Band [MHz]
x3 x2 x1 x0
Crystal Load Capacitance [pF]
0
0
1
1
315
433
868
915
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
8.5
9.0
1
0
9.5
1
10.0
…
Clock Output Frequency
[MHz]
d2 d1 d0
1
1
1
1
1
1
0
1
15.5
16.0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1.25
1.66
2
The resulting output frequency can be calculated as:
SIGN
fout = f0 – (-1) * (M + 1) * (30 kHz)
2.5
3.33
5
where:
f0 is the channel center frequency (see the next command)
M is the three bit binary number <m2 : m0>
SIGN = (ms) XOR (FSK input)
10
13
SILICON [ SILICON ]
