TWR-ADCDAC over SPI with K70F120M

[stefanmay]

Dear community,

I am a bit frustrated about the documentation of the Kinetis tower and its modules. Can anyone give me advices for the SPI timing parameters needed to run the LTC2600 on TWR-ADCDAC?

I am using Processor Expert with MQX, since I was expecting a proper tool-driven support.

What are the correct parameters for

- Clock rate

- Delay between chars

- CS to CLK delay

- CLK to CS delay

?

I cannot establish a stable communication. Your help is very appreciated.

Best regards,

   Stefan May

[Hui_Ma]

Hi,

From LTC2600 datasheet, the K70 max. SPI speed 30MHz should works with LTC2600 (LTC2600 could support SPI speed 50MHz);

Delay between chars, the LTC2600 Min. is 10ns, so SPIx_CTARn[PDT] using the reset value 0b0 should be ok.

LTC2600 could support CS TO CLK delay min. 7ns, which is much smaller than K70 DSPI CS to CLK delay (K70 datasheet is about 30ns);

The SPIx_CTARn[PCSSCK] can keep the reset value 0b0;

CLK to CS delay without related info at LTC2600, The SPIx_CTARn[PASC] keep the reset value 0b0.

Have a great day,
best regards,

Ma Hui

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