ADS7854: Issue when reading configuration data

Arnaund,

For SPI Mode:  Different literature is not completely constant on what the numbers refer to for SPI mode.   Thus, I will describe the mode behavior for this device.  For ADS7854 the clock can idle high or low.  Data transitions on the rising edge and is captured on the falling edge.  I believe you are assuming that clock idles high, data transitions on rising edge, and is captured on falling edge.  This is a correct way of interoperating the SPI communications. 

Regarding the register read.  The data sheet implies that you should be able to read the ADDR1, and ADDR0 bits.  However, I suspect that this may not be correct and these are write only bits (similar to bit 15 Write/Read).  The fact that all the remining bits read back correctly supports this assumption.  Also, the fact that the remaining bits looks correct indicates that you are using the correct SPI mode.  I will confirm this operation in the lab, but this may take some time.  For now, I think you are correctly configuring the device.

Best regards,

Art

Arnaund,

I did not have any devices on hand.  I placed an order for some samples.  It will be a few days before I can confirm this.

Thanks,

Art