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Si4420
Bits 8-4 (mp, m3 to m0) : FSK modulation parameters:
The resulting output frequency can be calculated as:
where:
f out = f 0 + (-1) SIGN * (M + 1) * (15 kHz)
P out
f 0 is the channel center frequency (see the
Frequency Setting Command )
M is the four bit binary number < m3 : m0>
SIGN = ( mp ) XOR (FSK input)
df fsk
df fsk
Bits 2-0 (p2 to p0) : Output power:
f 0
f out
p2
0
0
0
0
1
1
1
1
p1
0
0
1
1
0
0
1
1
p0
0
1
0
1
0
1
0
1
Relative Output Power [dB]
0
-3
-6
-9
-12
-15
-18
-21
mp=0 and FSK=0
or
mp=1 and FSK=1
mp=0 and FSK=1
or
mp=1 and FSK=0
The output power given in the table is relative to the maximum available power, which depends on the actual antenna impedance.
(See: Antenna Application Note: IA ISM-AN1)
11. Transmitter Register Write Command
Bit
15
1
14
0
13
1
12
1
11
1
10
0
9
0
8
0
7
t7
6
t6
5
t5
4
t4
3
t3
2
t2
1
t1
0
t0
POR
B8AAh
With this command, the controller can write 8 bits (t7 to t0) to the transmitter data register. Bit 7 (el) must be set in Configuration Setting
Command.
12. Wake-Up Timer Command
Bit
15
1
14
1
13
1
12
r4
11
r3
10
r2
9
r1
8
r0
7
m7
6
m6
5
m5
4
m4
3
m3
2
m2
1
m1
0
m0
POR
E196h
The wake-up time period can be calculated by ( m7 to m0 ) and ( r4 to r0 ):
T wake-up = M * 2 R [ms]
Note:
? For continual operation the et bit should be cleared and set at the end of every cycle.
? For future compatibility, use R in a range of 0 and 29.
Software reset: Sending FE00h command to the chip triggers software reset. For more details see the Reset modes section.
20
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