SI4022-A0-FT【PDF 11/20 页】IC TX FSK UNI 868/915MHZ 16TSSOP

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Sheet目录57

7页 8页 9页 10页 [11页]12页 13页 14页 15页

Si4022

bit 15 14 13 12 11 10

POR

ex es etr eb

C002h

bit 15 14 13 12 11 10

POR

f11 f10 f9

AD57h

Band [MHz]

868

915

Power Management Command

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.

The constant C is determined by

the selected band as:

Frequency Setting Command

The 12-bit parameter of the Frequency Setting

Command 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

center frequency f

can be calculated as:

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

Bit

POR

Transmitter FIFO Write Command

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

Note

Note: 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

etr

Active (transmit)

Idle

Sleep

Standby

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