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AD5522 PMU usb communication problem

Question asked by KevinCai on May 23, 2016
Latest reply on Jul 21, 2016 by KevinCai

I tried to use the measurement chip AD5522 to output a constant 4V voltage。

And I setup all the needed data to the specific regs(as  data x1_reg=CCCC, gain m_reg=FFFF, offset c_reg=8000)

But none right output voltage was get.   I read back all the regs , which are just as the default config(as x1_reg=8000)

AD5522 (1).PNG

AD5522 (2).PNG

AD5522 (3).PNG


So  I doubted that it is a mcu comunication problem. ( QUESTION 1 )

but when i operated in the SWEEPS page as blew,  it  displayed the right output. 

so the communication works just right ???  

And in this config,  the output is clampped  on  1.21V.  ( QUESTION 2)  Actually the defualt Clamp range is from 0000 to FFFF.

AD5522 (4).PNG

Should i suppose to reload mcu firmware or any other moves ?