DSALPHA-3

Jul 09

©

2009 RF Solutions Ltd.

Page 7

ALPHA-TX

ALPHA-RX

Transmitter Programming Guide

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Brief description

The ALPHA Transmitter is a low cost FSK transmitter. It needs only an MCU, crystal, decoupling capacitor

and antenna to build a high reliability FSK transmitter. The operation frequency can cover 300 to

1000MHz.

The module supports a command interface to setup frequency, deviation, output power and also data rate.

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Commands

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． Timing diagram

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． 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

d2

d1

d0

x3

x2

x1

x0

ms

m2

m1

m0

8080h

b1..b0: band select：

b1

b0

band[MHz]

0

1

433

1

0

868

1

1

915

d2..d0: select frequency of CLK pin

d2

d1

d0

CLK frequency[MHz]

0

0

0

1

0

0

1

1.25

0

1

0

1.66

0

1

1

2

1

0

0

2.5

1

0

1

3.33

1

1

0

5

1

1

1

10

CLK signal is derived from the crystal oscillator and can be applied to the MCU clock in to save a

second crystal. If not used, please set bit “dc” to disable CLK output