AN2846 datasheet(28/35 Pages) STMICROELECTRONICS

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SCLT3-8 link configurations

AN2846

28/35

Doc ID 15130 Rev 1

SCLT3-8 link configurations

Parallel and daisy chain configurations can be implemented using SCLT3-8 or other devices

compatible with a serial peripheral interface.

In parallel mode the microcontroller selects the SCLT-8 with which it wants to communicate

by setting the corresponding /CS to low state as long as the communication lasts. The

microcontroller should be able to control as many /CS pins as SCLT-8s it wants to address.

While in daisy chain configuration the microcontroller commands at the same time all the

SCLT3-8s connected in series. The data must transit from SCLT3-8 to SCLT3-8 going out

from the MISO pin, going in through MOSI pin till reaching the last one connected to the

microcontroller. Considering n SCLT3-8s connected in daisy chain, the microcontroller has

to read n times 16 bits and the communication time is proportional to n times 16 bits.

Figure 36.

Daisy-chain configuration

Figure 37.

Parallel configuration

SCK

MISO

/CS

MOSI

SCLT

SCK

MISO

/CS

MOSI

SCLT

SCK

MISO

/CS

MOSI

MASTER SPI

SCLT

SCK

MISO

/CS1

MOSI

MASTER SPI

SCK

MISO

/CS1

MOSI

SCLT

SCK

MISO

/CS2

MOSI

/CS2

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