STW82102B datasheet(47/67 Pages) STMICROELECTRONICS

Part #	STW82102B

Description	RF down converter with embedded integer-N synthesizer

PDF	67 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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47 / 67 page

STW82102B

SPI digital interface

Doc ID 018516 Rev 2

47/67

SPI digital interface

10.1

SPI general features

The SPI digital interface is selected by hardware connection of the pin 25 (DBUS_SEL) to

3.3 V.

The STW82102B 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 100 MHz 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 21.

SPI input and output bit order

Last

DATA

LOAD

25 (MSB)

LOAD #4

Reg. #0

Reg. #1

Reg. #4

Address

bit sent

(LSB) 0

decoder

00 (LSB)

STW82102B Datasheet(PDF) 47 Page - STMicroelectronics