Si4022

 

 

 

0

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 parameter of the 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

The constant C is determined by

the selected band as:

center frequency f can be calculated as:

= 8 * 10 MHz * (C + F/4000)

Power Management 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

0

0

ex

es

etr

eb

et

dc

C002h

Bit 5 <ex>:

Enables the the crystal oscillator.

Bit 4 <es>:

Enables the synthesizer.

Bit 3 <etr>:

Enables the power amplifier. If the ex and es bit is not set, it switches on the crystal oscillator and the

synthesizer as well.

In FIFO mode (bit fe is set in the FIFO Setting Command) setting this bit will roll out the content of the FIFO.

Bit 2 <eb>:

Enables the low battery detector.

Bit 1 <et>:

Enables the wake-up timer.

Bit 0 <dc>:

Disables the clock output buffer.

N

N

Nooottteee:

If faster operation is needed, then leave ex and es bit set to ‘1’ and toggle only the etr bit.

Power Saving Modes

The different operating modes of the chip depend on the following control bits:

Operating Mode

eb or et

es

etr

ex

Active (transmit)

X

x

1

x

Idle

X

0

0

1

Sleep

1

0

0

0

Standby

0

0

0

0

Transmitter FIFO Write Command

Bit

7

6

5

4

3

2

1

0

POR

 

1

1

0

0

0

1

1

0

-

With this command, the controller can write databits to the transmitter FIFO. Bit (fe) must be set in the FIFO Setting Command.

f

0

Band [MHz]

C

868

10

915

11