PCA9536 and BeagleBone Black

Hardware
1

Has anyone found a way to make the Beaglebone black communicate with the PCA9536 over I2C? When I attempted to detect the 2 cards as 41 and 43 they did not appear!

2

What hardware are you using? Can you provide a photo of your hardware setup?

3

I am using the BeagleBone black with the I2C cape on pins 19 and 20. Attached to this is 4 4xrelay boards, 2 4xanalog in, 2 4xanalog out, and 2 4xDI. The DI, DO are powered by an external 12 vdc power supply with the appropriate power jumper settings.

4

Hi,

Is there any way you can provide a photo of the hardware setup?

I’ll look into this, it has been quite a while since I worked with I2C on BBB so I’ll have to do a little refresher.

I assume you are using i2ctools and running the detect command? What port are you scanning with the detect command?

5

I am using the I2C tools and running the detect command on 2 as it is pre built in the BBB. I do not seam to be able to post a picture. The manufacture has stated:

"Its not related to any hardware difference. Its related to SMBUS/i2c kernel lib. Fixing this lib issue could be a big task. "

I am not sure how that all comes together but it looks as if I may have to move to different hardware.

6

Who is the manufacture that stated that? Are you using hardware we developed in this application? I’m trying to understand exactly what devices you have.

7

Is this the I2C interface board you have installed on the BBB?

If so what System image(OS) are you running on the BBB?

8

I have the I2C shield and it is working correctly. I plug the IO cards from NCD and the PAC9536 are not available on the i2cdetect tool. I also can not read any information from them when they have a known voltage to them (12 VDC from power supply). Next using the I2C shield for the Pi3 and the devices show up as addressed. After speaking with: Bhaskar (National Control Devices) @ support@ncd.zendesk.com, they have said that it is the fault of the sumbus for I2c on the BeagleBone that is to blame for the failure. I have contacted sumbus to see if they have any ideas but I am coming up short.