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AD7685 CS MODE - SDI PIN

Question asked by mahesh0208 on Sep 20, 2017
Latest reply on Sep 21, 2017 by Gnib

Hi,

 

Having some trouble with AD7685 in CS mode 3 wire without busy indicator. Both Vref and VDD are tied to 3.3V and i am getting 3.3V output on VIO. 

 

As mentioned in Page 19 of the datasheet, I have tied the SDI pin to VIO (through a 5.1kΩ resistor).

 

But the setup didnt work and later I found that the SDI pin is showing directing short to GND.

 

So I guess the Pin 9 (SDI) is burned, without which will I be able to use AD7685 in SPI-CS mode? What could have caused this problem? I am working with an lpc2148 as host, with ~800kHz CLK and CNV in every 10uS.

 

 

Thanks,


Mahesh

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