MCT8316AEVM: MCT8316AEVM I2C percentage not linear to RPM?

Hi,

first I tried the MCF8316A where this was not a problem. 50% of duty -> 50% of MAXSPEED.

But my customer told me we must use the MCT ( because of the motor type)

So I change to MCT type.
All works fine so far.

Motor starts perfekt.

Also I can control the motor from 6000rpm to 33000rpm.

The only thing I want to set  RPM via a I2C demand.

Setup: MAX_SPEED is 666 Hz alias arround 40.000 RPM.

so if I set 50% -> I get not 20.000 RPM

So is my assumtion wrong?

Or did I something wrong with the setup.

BR

Andreas

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