DRV8308: DRV8308 IC Compressor stops under load

Part Number:DRV8308

Hi,

I'm driving Thomas 600490F compressor wtih DRV8308. I have another driver to compare compressor's behaviour under curtain conditions. In PWM mode, compressor did not draw current high enough when Torque increased. I realize that, our ISENSE trace need to be thicker and we solve that problem. I'm able to draw about 4A current undur full load.

However, I have to use UpdateRegisters(found in evm firmware ) function in While loop, when i only use UpdateRegister function before while loop compressor stops when compressor draws about 1.1A and does not start again. Disabling driver and re-enabling it, does not solve the problem. When UpdateRegister function is in the loop when AUTO_WRITE is closed compressor stops again. When AUTO_WRITE is set compressor runs again.

What could be the problem?