User Manual

RA01
Version: 1.0 Date: 10/8/2008
Control Commands
Control Word Related Parameters/Functions Related control bits
1
Configuration Setting Command Frequency band, crystal oscillator load
capacitance, baseband filter bandwidth, etc.
b1 to b0, eb, et, x3 to x0,
i2 to i0. dc
2
Frequency Setting Command Frequency of the local oscillator f11 to f0
3
Receiver Setting Command VDI source, LNA gain, squelch, enable receiver d1 to d0, g1 to g0, sq, en
4
Wake-up Timer Command Wake-up time period r3 to r0, m7 to m0
5
Extended Wake-up Timer Command Wake-up time period finer adjustment d1 to d0, m13 to m8
6
Low Battery Detector
and Clock Divider Command
LBD voltage and microcontroller clock division
ratio
d2 to d0, elfc, t3 to t0
7
Data Filter Command Data filter type, clock recovery parameters, POR
level selection, autosleep mode
al, ml, dsfi, sf, ewl, srt, r1
to r0
8
Data Rate Command Bit rate cs, r6 to r0
9
Output and FIFO Command FIFO IT level, FIFO start control, FIFO enable
and FIFO fill enable
f3 to f0, s1 to s0, ff, fe
10
Extended Features Command Low frequency output clock, wake-up timer extra
functions, long FIFO extra functions
exlp, ctls, dcal, bw1 to
bw0, f5 to f4
11
Low Duty Cycle Command Duty Cycle operation d6 to d0, enld
12
Demodulator Setting Command Demodulator time constant tc1, tc0
13
Status Read Command Receiver 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 eb et ex x3 x2 x1 x0 i2 i1 i0 dc 938Ah
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
… …
0 0 0 0 15.5
0 0 0 0 16.0
b1 b0 Frequency Band [MHz]
0 0 Reserved
0 1 434
1 0 868
1 1 915
i2 i1 i0 IF Frequency
[kHz]
Baseband
Bandwidth [kHz]
0 0 0 Reserved Reserved
0 0 1 245 340
0 1 0 230 260
0 1 1 180 200
1 0 0 145 140
1 0 1 105 105
1 1 0 Reserved Reserved
1 1 1 Reserved Reserved
Bits eb and et control the operation of the low battery
detector and wake-up timer, respectively. They are
enabled when the corresponding bit is set.
If ex is set the crystal is active during non-active
mode. When dc bit is set it disables the clock output.
Note: The wake-up timer can be enabled by the elfc bit in the Low Battery Detector and Microcontroller Clock
Divider Command or by the
enldc bit in the Low Duty Cycle Command or by enabling the low battery detector by eb bit in this command.
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