STW81101ATR datasheet(34/48 Pages) STMICROELECTRONICS

tên linh kiện	STW81101ATR

Giải thích chi tiết về linh kiện	Multi-band RF frequency synthesizer with integrated VCOs

PDF	48 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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34 / 48 page

SPI digital interface

STW81101

34/48

7.2

Timing specification

Figure 27.

SPI timing specification

Table 18.

SPI data structure (MSB is sent first)

MSB

LSB

Address

Data for register (24 bits)

A0 D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Table 19.

Address decoder and outputs

Address

Outputs

Data bits

D23-D0

Name

Function

ST1

Reference divider, VCO amplitude, VCO calibration,

charge pump current, prescaler modulus

ST2

Functional modes, VCO dividers

ST3

Reserved

ST4

Reserved

Table 20.

SPI timing specification

Parameter

Description

Min.

Typ.

Max.

Unit

tsetup

Data to clock setup time

0.8

thold

Data to clock hold time

0.2

tclk

Clock cycle period

tload

Load pulse width

tclk_loadr

Clock to load rising edge

tclk_loadf

Clock to load falling edge

0.5

Data

MSBMSB-1

LSB

tsetup

tdk

clk_loadr

tload

thold

Clock

Load

clk_loadf

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