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STW81101 bảng dữ liệu(PDF) 29 Page - STMicroelectronics

tên linh kiện STW81101
Giải thích chi tiết về linh kiện  Multi-band RF frequency synthesizer with integrated VCOs
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STW81101 bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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STW81101
SPI digital interface
29/42
6
SPI digital interface
6.1
General features
The SPI digital interface is selected by hardware connection of the pin #21 (DBUS_SEL) to
3.3V.
The STW81101 IC is programmed by means of a high-speed serial-to-parallel interface with
write option only. The 3-wires bus can be clocked at a frequency as high as 100MHz to allow
fast programming of the registers containing the data for RF IC configuration.
The programming of the chip is done through serial words with whole length of 26 bits. The
first 2 MSB represent the address of the registers. The others 24 LSB represent the value of
the registers.
Each Data bit is stored in the internal shift register on the rising edge of the CLOCK signal.
On the rising edge of the LOAD signal the outputs of the selected register are sent to the
device.
Figure 22.
SPI input and output bit order



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