Si4021
20
Data Transmit Sequence Through the FSK Pin
nSEL
SCK
SDI
instruction
Internal operations
a0, a1 = 0
ex, es, ea = 1
xtal osc. stable
Xtal osc staus
FSK
T X D A T A
synthesizer on, PLL locked, PA ready to transmit
synthesizer / PLL /
PA status
tsx *
tsp *
C 0 h
3 8 h
d o n ' t c a r e
P o w e r M a n a g e m e n t C o m m a n d
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 t
sx
+t
sp
delay is not needed.
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