SX1240ISTRT Semtech, SX1240ISTRT Datasheet - Page 13

• Manufacturer Part Number: SX1240ISTRT
• Description: IC, RF/IF TRANSMITTER, 868.3MHz, SOIC-8
• Manufacturer: Semtech

Specifications of SX1240ISTRT

• Transmitting Current: 16.5mA
• Data Rate: 100Kbps
• Modulation Type: FSK, OOK
• Rf Ic Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 1.8V To 3.7V
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes

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