[51] ad7730 problems, bad reading

[wsurferw]

Hi all, I'm designing a circuit for a tilted using the AD7730, I communicate with the device properly, use single conversion for reading data, but approximately 25% of the read data are FFFF (16 bit mode). I've tried different sampling frequencies from 50Hz to 800Hz and occurs in all cases alike.
Can anyone help?


Thank you very much.

 

[milan.rajik]

Zip and post complete project files (code + circuit).

 

[wsurferw]

Zip and post complete project files (code + circuit).

Thank you very much for your reply and the time spent by me.
In the attached is the schematic. The reset line is actually controlled by the micro an AT89S8253.
The software that accompanied it performs the initialization of the AD7730, also the reading of the data.

Sorry for my English (google translator) Greetings.