Buffer size for SPI communication using MC20XS4200 in daisy chain configuration.

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Buffer size for SPI communication using MC20XS4200 in daisy chain configuration.

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Contributor III

Dear NXP hello,

I am using the MC20XS4200 to control 6 outputs motor and bulb loads. The PCB board contains 3 MC20XS4200, each MC20XS4200 has 2 channels.

The MC20XS4200 are connected in daisy chain configuration, each MC20XS4200 has 13 register out and 13 register in. Each MC20XS4200 is controlled by its /CSB.

Since the MC20XS4200 are connected in daisy chain configuration, I have to send one buffer each 10ms task for all the MC20XS4200s to write, read and toggle WD to avoid reset.

My question is:

How I could calculate the buffer cache size?Capture d’écran 2021-06-26 105818.pngCapture d’écran 2021-06-26 105835.png

Thank you in advance,

S.Tarik

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