SI4020 查看數據表（PDF） - Silicon Laboratories

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SI4020

Universal ISM Band FSK Transmitter

Silicon Laboratories 

Data Transmit Sequence Through the FSK Pin

Si4020

nSEL

SCK

SDI

Power Management Command

C0h

38h

instruction

Internal operations

a0, a1 = 0

ex, es, ea = 1

Xtal osc staus

synthesizer / PLL /

PA status

FSK

don't care

tsx *

xtal osc. stable

tsp *

synthesizer on, PLL locked, PA ready to transmit

TX DATA

NOTE:

* See page 6 for the timing values

Data Transmit Sequence Through the SDI Pin

Note:

• Do not send CLK pulses with the TX data bits; otherwise they will be interpreted as commands.

• This mode is not SPI compatible, therefore it is not recommended in microcontroller mode.

• If the crystal oscillator and the PLL are running, the tsx+tsp delay is not needed.

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