MCT8329A: DC_BUS_CURR / 256 not showing correct current value

Hi!

I'm experiencing some problems reading the bus current from MCT8329 in a full custom application.

Reading Sys_Status1 returns the correct bus voltage. However when I read Sys_Status3 the DC_BUS_CURR is much too low (yes I divided by 256). I'm wondering in what way the MCT knows about the current in the system. It must be measured by the voltage drop over the shunt?! In my application the shunt is 750uR. So there must be a register, to set the shunt value for correct calculation inside the MCT. But this register doesn't exist (at least in the datasheet). I don't assume, that the MCT use some sophisticated algorithms to determine the real value of Rshunt....

So how do I calculate the correct bus current from DC_BUS_CURR for an arbitrary RShunt?

Kind regards,

Jonas