cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
331 Views
Registered: ‎03-09-2020

The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Hello,

I have Nexys A7 FPGA board. Board boots up. But the I2C communication has stopped working.

I checked voltage using multi-meter between clock pin and ground pin. The clock line (for I2C - "JA") is low.

I also checked the resistance between JA pins and ground. Between clock pin and ground, it is around 700 Ω. Whereas on pins other than clock, the resistance is 2 MΩ.

I measured resistance across resistor R3. The value matches the schematic data of 200 Ω.

Can someone help to make the I2C communication work.

Thanks

0 Kudos
1 Solution

Accepted Solutions
Highlighted
209 Views
Registered: ‎03-09-2020

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Hi,

We figured out that the ESD protection diode D3 connected to this line is damaged.

 

Regards,

Jayshree

View solution in original post

5 Replies
Highlighted
Xilinx Employee
Xilinx Employee
255 Views
Registered: ‎06-21-2018

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Hi jayshree,

Maybe I'm missing something, but why do you assume that the PMOD JA can handle I2C? Which PMOD are you connecting to it?

Thanks,
Andres

 

0 Kudos
Highlighted
250 Views
Registered: ‎06-21-2017

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Are there pull up resistors on your I2C lines?

0 Kudos
Highlighted
210 Views
Registered: ‎03-09-2020

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Hi Andres,

We figured out that the ESD protection diode D3 connected to this line is damaged.

 

Regards,

Jayshree

0 Kudos
Highlighted
210 Views
Registered: ‎03-09-2020

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Hi,

We figured out that the ESD protection diode D3 connected to this line is damaged.

 

Regards,

Jayshree

View solution in original post

Highlighted
Xilinx Employee
Xilinx Employee
177 Views
Registered: ‎06-21-2018

Re: The I2C communication stopped working on Nexys A7 FPGA boards

Jump to solution

Good job, Jayshree! Thanks for the update!

Mark your answer as an Accepted Solution to benefit other users and to close this thread.

Cheers,
Andres

0 Kudos