SX1240 Просмотр технического описания (PDF) - Semtech Corporation

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SX1240

Low Cost Integrated Transmitter IC 434 MHz and 868 MHz Band RF Transmitter

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX1240

Integrated Transmitter IC

DATASHEET

4. Configuration Register

Table 8 SX1240 TWI Register Description

Bit

Name

D12 Tx Mode

D(11:9) Frequency

D8 Modulation

D(7:5) Freq. Devia-

tion

D4 RF Power

D3 Tx Timer

D(2:0) Fine Tuning

T(42:0) Test

Nbits State

Setting

1

0

Power & Go

1

Forced Transmit

3

000

001

010

011

100

101

110

111

418.00 MHz

433.42 MHz

433.92 MHz

864.00 MHz

868.30 MHz

868.65 MHz

868.95 MHz

869.85 MHz

1

0

1

FSK

OOK

3

000

001

010

011

100

101

110

111

10 kHz

12.5 kHz

20 kHz

25 kHz

40 kHz

50 kHz

80 kHz

100 kHz

1

0

1

0 dBm

10 dBm

1

0

1

2 ms

20 ms

3

011 fc + 6 * PLL Step

010 fc + 4 * PLL Step

001 fc + 2 * PLL Step

000 fc + 0 * PLL Step

111 fc - 2 * PLL Step

110 fc - 4 * PLL Step

101 fc - 6 * PLL Step

100 fc - 8 * PLL Step

43

-

-

Default

CTRL = ‘0’ CTRL = ‘1’

Notes

0

0

When set to ‘1’ SX1240 is in

continuous Tx until reset to ‘0’.

RF Operating centre frequency

010

100

0

Modulation format

1

FSK Frequency deviation (not

used in OOK mode).

010

010

Programmed RF output power.

1

1

0

Transmit power-off timer.

1

Fine tuning from programmed

centre frequency.

000

000

-

-

Test registers

SX1240, Rev 1, Oct 2010

©2010 Semtech Corp.

Page 13

www.semtech.com

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