MC33664 with single SPI port on MCU

[jbirchy]

can the MC33664 operate with a single SPI port on a MCU?

The datasheet shows the following, but I thought a single SPI port architecture was possible

[TomasVaverka]

Hello John,

The TPL bus is only suitable handling half duplex communication (one sender only).

If the MCU wants to send messages via the MC33664 the MCU is the SPI master providing CSB; CLK, DATA.

If the MC3377x transmits message the MC33664 translates the message back to SPI signals providing CSB, CLK, DATA. The MCU is acting as SPI slave here.

The MC33664 is intentional done as just translator without any internal intelligence (eases functional (ASIL) safety requirements).

Using a MOSI, MISO would require to change this fundamental requirement setup. And the handling would not be as easy as it looks from first sight.

Best regards,

Tomas

[Patrick_Pavle]

Hello @TomasVaverka ,

so this isn´t a fault in figure 1 that MOSI should be used twice for both SPI interfaces?

Best regards,

Patrick