SI4022-A0-FT【PDF 10/20 页】IC TX FSK UNI 868/915MHZ 16TSSOP

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Sheet目录57

6页 7页 8页 9页 [10页]11页 12页 13页 14页

Si4022

Control Word

Related Parameters/Functions

Configuration Setting Command

frequency band and deviation, output power, crystal oscillator load capacitance

Frequency Setting Command

frequency of the local oscillator

Power Managament Command

crystal oscillator, synthesizer, power amplifier, low battery detector, wake-up timer,

clock output buffer

Transmitter FIFO Write Command

transmitter FIFO write

FIFO Setting Command

FIFO functions

Data Rate Command

bit rate

Low Battery and Microcontroller Clock

Divider Command

LBD voltage threshold and microcontroller clock division ratio

Wake-up Timer Command

wake-up time period

Extended Wake-up Timer Command

wake-up time period finer adjustment

Extended Features Command

low frequency output clock, wake-up timer extra functions

Status Register Read Command

transmitter status read

bit 15 14 13 12 11 10

POR

bs p2 p1 p0 x3 x2 x1 x0 ms m2 m1 m0

9082h

Frequency Band [MHz]

868

915

p2 p1 p0

Output Power

[dBm]

-3

-6

-9

-12

-15

-18

-21

x3 x2 x1 x0

Crystal Load

Capacitance [pF]

8.5

9.0

9.5

10.0

15.5

16.0

Control Commands

Note

Note: In the following tables the POR column shows the default values of the command registers after power-on.

Configuration Setting Command

The resulting output frequency can be calculated as:

out

= f

(-1)

SIGN

* (M + 1) * (20 kHz)

where:

is the channel center frequency (see the

next command)

M is the three bit binary number <m2 : m0>

SIGN = (ms) XOR (FSK input)

The output power is given in the table as

relative to the maximum available power, which

depends on the actual antenna impedance.

(See: Antenna Application Note available from

http://www.silabs.com/integration).

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