Hello everyone,
I'm currently testing a small data acquisition project with the AD7705/AD7606 Data Acquisition Module (this one: https://easyelecmodule.com/product/ad7705-and-ad7606-data-acquisition-module/). The goal is to capture precise voltages from sensors via SPI. Unfortunately, nothing's working so far, the module simply isn't responding.
What's happening so far:
I have a stable 3.3 V supply, all GND references are correctly connected, and the SPI lines are soldered. When I try to read the data, the BUSY pin remains permanently LOW, even though I trigger the conversion start (CNVST) via SPI.
With the AD7705, I wanted to read data, but the return value always remains 0x0000 , apparently, the reset/init signal isn't being recognized correctly.
My questions:
Does a reset or init command have to be activated via hardware (reset pin) before data can be read? (For some users, this was the solution.) Are there any basic timing rules for SPI that are easily overlooked and lead to busy pin problems?
How do you typically measure the busy pin? Do I need to reduce the load or add a buffer?
I would be very grateful if anyone could help me get started or give me some tried-and-tested tips.
Regards and thanks in advance, Jordan