User Manual

RA01
Version: 1.0 Date: 10/8/2008
2. Frequency Setting Command
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 POR
1 0 1 0 f11 f10 f9 f8 f7 f6 f5 f4 f3 f2 f1 f0 AD57h
The 12-bit Frequency Setting Command <f11 :
f0> has the value F. The value F should be in the
range of 96 and 3903. When F is out of range, the
previous value is kept. The synthesizer center
frequency f
0 can be calculated as:
f
0 = R * 10 MHz * (C + F/4000)
The constant C is determined by the selected
band as:
Band [MHz] R C
433 4 5
868 8 10
3. Receiver Setting Command
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 POR
1 1 0 0 0 0 0 0 d1 d0 g1 g0 sq 0 0 en C080h
Bit 7-6 < d1:d0 >: Select the VDI (valid data indicator) signal:
d1 d0 VDI output
0 0 RSSI or Clock Recovery Lock
0 1 RSSI
1 0 Clock Recovery Lock
1 1 Always High
Bit 5-4 < g1:g0 >: Set the LNA gain:
g1 g0 GLNA (dB relative to max. G)
0 X Automatic Gain Switch
1 0 -32
1 1 0
Bit 3 <sq>: Enables the squelch function. Disables the signals on pin 6 (data) and pin 7 (data clk) when VDI is low.
Bit 0 <
en >: Enables the whole receiver chain and crystal ocsillator when set. Enable/disable of the wake-up timer
and the low battery detector are not affected by this setting.
4. Wake-up Timer Command
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 POR
1 1 1 0 r3 r2 r1 r0 m7 m6 m5 m4 m3 m2 m1 m0 E196h
The wake-up time period can be calculated by M < m13 : m0 > , R < r3 : r0 > and D < d1 : d0 >:
T
wake-up = M * 2
R-D
ms
Note: The wake-up timer generates interrupts continuously at the programmed interval while the
et bit is set.
5. Extended Wake-up Timer Command
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 POR
1 1 0 0 0 0 1 1 d1 d0 m13 m12 m11 m10 m9 m8 C300h
These bits can be used for further fine adjustment of the wake-up timer. The explanation of the bits can be found
above.
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