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Si4420
3. Frequency Setting Command
Bit
15
1
14
0
13
1
12
0
11
f11
10
f10
9
f9
8
f8
7
f7
6
f6
5
f5
4
f4
3
f3
2
f2
1
f1
0
f0
POR
A680h
The 12-bit parameter F (bits f11 to f0 ) should be in the range of
96 and 3903. When F value sent is out of range, the previous
The constants C1 and C2 are determined by
the selected band as:
value is kept. The synthesizer center frequency f 0 can be
calculated as:
f 0 = 10 * C1 * (C2 + F/4000) [MHz]
Band [MHz]
315
433
868
915
C1
1
1
2
3
C2
31
43
43
30
4. Data Rate Command
Bit
15
1
14
1
13
0
12
0
11
0
10
1
9
1
8
0
7
cs
6
r6
5
r5
4
r4
3
r3
2
r2
1
r1
0
r0
POR
C623h
The actual bit rate in transmit mode and the expected bit rate of the received data stream in receive mode is determined by the 7-bit
parameter R (bits r6 to r0 ) and bit cs .
BR = 10000 / 29 / (R+1) / (1+ cs *7) [kbps]
In the receiver set R according to the next function:
R= (10000 / 29 / (1+ cs *7) / BR) – 1, where BR is the expected bit rate in kbps.
Apart from setting custom values, the standard bit rates from 600 bps to 115.2 kbps can be approximated with small error.
Data rate accuracy requirements:
Clock recovery in slow mode: ? BR / BR < 1 / (29*N bit )
Clock recovery in fast mode: ? BR / BR < 3 / (29*N bit )
BR is the bit rate set in the receiver and ? BR is the bit rate difference between the transmitter and the receiver. N bit is the maximal number of
consecutive ones or zeros in the data stream. It is recommended for long data packets to include enough 1/0 and 0/1 transitions, and be
careful to use the same division ratio in the receiver and in the transmitter.
5. Power Setting Command
Bit
15
1
14
0
13
0
12
1
11
0
10
p16
9
d1
8
d0
7
i2
6
i1
5
i0
4
g1
3
g0
2
r2
1
r1
0
r0
POR
9080h
Bit 10 (p16) : pin16 function select
p16
0
1
Function of pin 16
Interrupt input
VDI output
14
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