DC2420 eavaluation board of LTC2984


I am FAE in Japanese distributor.

Our customer evaluates DC2420 with DC2214.

They confirmed INTERRUPT pin was High after power up.

But Status register retruned the data value=0x00.

According to the datasheet, It should be 0x40.

And SDO level on their board was high before status regiter read and SDO level was low after status regiter read.

Then, INTERRUPT changed high → low → high when Status register was write 0x80.

They judged the boards connected correctlly.

Coud you inform why the status register returned the data value=0x00 after initialization?

Attached Evaluation picture.jpg is our cutomer board connection picture.

Best regrads