Hello,
I am using the adt7410 IC.
As you can see in the image I attached, I am trying to write x02 to the configuration register and then I want to read back the value that I wrote. In the image, when I readback the configuration register, it seems that I read x0C. It is observed that I read the value at temperature value most significant byte (x00). Can you help me what am I doing wrong?
Thanks in advance.
Hello ,
The circuit diagram is as in the image.
I set the configuration bits as follows;
[1:0] Fault queue : 10 = 3 faults.
2 CT pin polarity : 0 = active low
3 INT pin polarity : 0 = active low.
4 INT/CT mode : 0 = interrupt mode
[6:5] Operation mode : 00 = continuous conversion (default). When one conversion is finished, the ADT7410 starts another.
7 Resolution : 0 = 13-bit resolution. Sign bit + 12 bits gives a temperature resolution of 0.0625°C.
When I read back the configuration register, I want to see the value I wrote and prove that it was written correctly.
I can read temperature values from 0x00 and 0x01 addresses but I can't read configuration register(from 0x03) , status register (from 0x02) and ID(from 0x0B).
Regards,
seyma
Hi Seyma ,
I tried to replicate the error you've been getting, and was successful in doing so. I have found out that what you were reading was the temperature MSB register. The issue could be resolved by implementing a repeat start at the end of your write, before trying to read the said registers. Please see attached image as a reference (red windows) where to implement a repeated start. 
Regards,
Karlo
Hi ,
Thank you for reply but I can't see the image you attached. If you don't mind can you send it again?
Regards,
Seyma
Hi Seyma ,
Sorry for the broken file, please see attached image. The red windows are where you're supposed to implement a repeated start instead of fully stopping the communication. I hope this helps.
Regards,
Karlo
