IA4420 Datasheet, PDF (20/29 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

IA4420
Bits 8-4 (mp, m3 to m0): FSK modulation parameters:
The resulting output frequency can be calculated as:
f_out = f₀ + (-1)^SIGN * (M + 1) * (15 kHz)
where:
f₀ is the channel center frequency (see the
Frequency Setting Command)
M is the four bit binary number <m3 : m0>
SIGN = (mp) XOR (FSK input)
Bits 2-0 (p2 to p0): Output power:
p2 p1 p0
000
001
010
011
100
101
110
111
Relative Output Power [dB]
0
-3
-6
-9
-12
-15
-18
-21
P_out
df _fsk df _fsk
mp=0 and FSK=0
or
mp=1 and FSK=1
f _out
f₀
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 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 1 1 1 0 0 0 t7 t6 t5 t4 t3 t2 t1 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 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 r4 r3 r2 r1 r0 m7 m6 m5 m4 m3 m2 m1 m0
PO R
E1 9 6 h
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.
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