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Always getting overrange on FIFO Status of AD6641

Question asked by sjkim on Oct 23, 2017
Latest reply on Oct 25, 2017 by David.Buchanan

Hello, I'm trying to access AD6641 registers via SPI to handle data from ultrasound pulses.

I wrote a test code with reference to this article: How to choose for read FIFO SPI interface for AD6641? 

 

Unfortunately, however, it seems my AD6641 module cannot get into the FILL mode by an unknown reason.

 

I always get 0x04 when reading 0x10A (FIFO status) register, which means over-range.

But there is no explanation about over-range, and I even don't know what causes this phenomenon.

 

Is there any workaround to solve this problem, or is it a kind of hardware issue?

 

Any suggestions would be much appreciated.

 

Best Regards,

Sijun

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