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Si4430/31/32-B1
36
Rev 1.1
be modulated and transmitted. In RX mode it will be the received demodulated data. Figure 15 demonstrates using
SDI and SDO as the TX/RX data and clock:
Figure 15. Microcontroller Connections
If the SDO pin is not used for data clock then it may be programmed to be the interrupt function (nIRQ) by
programming Reg 0Eh bit 3.
4.2.3. PN9 Mode
In this mode the TX Data is generated internally using a pseudorandom (PN9 sequence) bit generator. The primary
purpose of this mode is for use as a test mode to observe the modulated spectrum without having to provide data.
SEL
SDI
DO
SPI input
dont care
SPI input
TX on
command
TX mode
MOD input
TX off
command
SPI input
dont care
RX on
command
RX mode
RX off
command
Data output
SPI input
SPI input
SPI output
SPI output
SPI output
SPI output
SPI output
dont care
dont care
Data CLK
Output
Data CLK
Output
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