L9945 datasheet(42/151 Pages) STMICROELECTRONICS

부품명	L9945

상세설명	Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems

PDF	151 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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42 / 151 page

Figure 20. Daisy chain and parallel operation

single chain

two devises in one daisy chain

three devises in one daisy chain

shift register

SDI

CLK

NCS1 NCS2 NCS3

IC C: L9945

IC B: L9945

IC A: L9945

NCS1

CLK

NCS1 CLK

NCS1

CLK

NCS1: low for 96 clocks CLK

writes into IC A-IC C

reads from IC A-IC C

IC D: L9945

NCS2 CLK

NCS2: low for 64 clocks CLK

writes into IC D -E

reads from IC D -E

IC E: L9945

NCS2

CLK

NCS3: low for 32

clocks CLK

writes into IC F

reads from IC F

SDO

IC F: L9945

NCS3

CLK

SDI

SDO

SDI

SDO

SDI

SDO

SDI

SDO

SDI

SDO

shift register

GAPG0102161614CFT

Figure 21. Data transfer in daisy chain operation

master SDI

NCS1

CLK

SDO device 3

SDI device 3

SDO device 2

SDI device 2

SDO device 1

SDI device 1

master SDO

GADG2802171135PS

5.9.4

SPI electrical characteristics signal and the timing diagram

This section contains the electrical characteristics of the SPI signal and the timing diagram.

Note:

Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V,

unless otherwise noted.

L9945

Serial Peripheral Interface (SPI)

DS12275 - Rev 8

page 42/151

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