12ASX2 datasheet(25/147 Pages) INFINEON

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EiceDRIVER

™ SIL

1EDI2002AS

Functional Description

Datasheet

Rev. 3.1, 2015-07-30

Hardware Description

2.4.4.2

General Operation

The SPI interface of the 1EDI2002AS supports full duplex operation. The interface relies on four communication

signals:

•

NCS: (Not) Chip Select.

•

SCLK: Serial Clock.

•

SDI: Serial Data In.

•

SDO: Serial Data Out.

The SPI interface of the 1EDI2002AS supports slave operation only. An SPI master (typically, the main

microcontroller) is connected to one or several 1EDI2002AS devices, forming an SPI bus. Several bus topologies

are supported.

A regular SPI bus topology can be used where each of the slaves is controlled by an individual chip select signal

(Figure 2-6). In this case, the number of slaves on the bus is only limited by the application’s constraints.

Figure 2-6 SPI Regular Bus Topology

In order to simplify the layout of the PCB and to reduce the number of pins used on the microcontroller’s side, a

daisy chain topology can also be used. The chain’s depth is not limited by the 1EDI2002AS itself. A possible

topology is shown Figure 2-7.

SCLK

Master

SDO

SDI

NCS1

SCLK

SDI

SDO

NCS

Slave 1

SCLK

SDI

SDO

NCS

Slave 2

SCLK

SDI

SDO

NCS

Slave n

NCSn

NCS2

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