STW81101 datasheet(30/42 Pages) STMICROELECTRONICS

부품명	STW81101

상세설명	Multi-band RF frequency synthesizer with integrated VCOs

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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30 / 42 page

SPI digital interface

STW81101

30/42

6.2

Timing specification

Figure 23.

SPI Timing specification

Table 17.

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

Table 18.

Address decoder and outputs

Address

Outputs

DATABITS

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 19.

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

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