SX1240
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
4. Configuration Register
DATASHEET
Table 8
SX1240 TWI Register Description
Default
Bit
Name
Nbits
State
Setting
Notes
CTRL = ‘0’
CTRL = ‘1’
D12
Tx Mode
1
0
Power & Go
0
0
When set to ‘1’ SX1240 is in
1
Forced Transmit
continuous Tx until reset to ‘0’.
D(11:9)
Frequency
3
000
418.00 MHz
RF Operating centre frequency
001
433.42 MHz
010
011
100
101
110
111
433.92 MHz
864.00 MHz
868.30 MHz
868.65 MHz
868.95 MHz
869.85 MHz
100
010
D8
Modulation
1
0
FSK
0
Modulation format
1
OOK
1
D(7:5)
Freq. Devia-
tion
3
000
001
010
10 kHz
12.5 kHz
20 kHz
010
010
FSK Frequency deviation (not
used in OOK mode).
011
100
101
110
111
25 kHz
40 kHz
50 kHz
80 kHz
100 kHz
D4
D3
RF Power
Tx Timer
1
1
0
1
0
0 dBm
10 dBm
2 ms
1
0
1
Programmed RF output power.
Transmit power-off timer.
1
20 ms
1
D(2:0)
Fine Tuning
3
011
fc + 6 * PLL Step
Fine tuning from programmed
010
001
fc + 4 * PLL Step
fc + 2 * PLL Step
centre frequency.
000
111
110
101
100
fc + 0 * PLL Step
fc - 2 * PLL Step
fc - 4 * PLL Step
fc - 6 * PLL Step
fc - 8 * PLL Step
000
000
T(42:0)
Test
43
-
-
-
-
Test registers
SX1240, Rev 1, Oct 2010
?2010 Semtech Corp.
Page 13
www.semtech.com
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