TUSB1046EVM: TUSB1046EVM I2C aardvark connection

Hi Marcel,

I am unfamiliar with the TUSB1046EVM hardware. However, the TPS65982 will be an I2C Slave by default. There should be no conflict with the Aardvark. I would suggest checking the schematic and EVM to ensure that there is a good connection to the I2C pins, the I2C pull-ups are active, and the TPS65982 is powered.

Thanks,
Eric

Hi Eric,

Can you please explain when the  I2C Port 1 and  I2C Port 2 do function as master as in the data sheet it is stated that these can be either slave or master, but it is unclear for me how the I2C master/slave role is determined.

We have a good connection with I2C, I did some additional test with Application Customization tool and connected the Aardvark to the Beagle and when using the "Sweep I2C address range for response" it was visible on the beagle address 0x0-0x7e transactions occurred. But when connected to J8 it looks like the TPS65982 is acting as a I2C master and the scanning fails.

The schematic for the TUSB1046EVM is http://www.ti.com/lit/ug/sllu255/sllu255.pdf but on the http://www.ti.com/tool/TUSB1046EVM#technicaldocuments there are complete different schematics and PCB layout.
Can you post a link to the correct PCB layout for the board we have?

Find below a picture of the PCB revision we have

Regards

Marcel

I

Marcel

Please see attached for the EVM schematic.

INT053A_Schematic.pdf

Thanks

David

Hi,

Thanks for the schematic but this is already available @ .

Maybe I am not clear with my questions, so I will repeat them again and hoping to receive the answers:

1. Can you please explain when the  I2C Port 1 and  I2C Port 2 do function as master as in the data sheet it is stated that these can be either >>slave or master, but it is unclear for me how the I2C master/slave role is determined.
   
   
2. When connecting a TotalPhase aardvark to J8 why I2C communication is not functioning? Is the TPS65982 a I2C master?
   
   
3. The schematic for the TUSB1046EVM is http://www.ti.com/lit/ug/sllu255/sllu255.pdf but on the http://www.ti.com/tool/TUSB1046EVM#technicaldocuments there are complete different schematics and PCB layout. Can you post a link to the correct PCB layout for the board we have so when know where the components are placed?
   
   
   

Kind Regards,
Marcel

Hello,

How to open this file? Can you send us a pdf of the assembly drawing?

But anyhow, we are stuck for now! We have two different boards and out of the box when applying voltage to the board and measuring the SCL and SDA lines on J8, one board has the SCL low and SDA high and the other has the SDA low and SCL high. This without any aardvark or cable connected expect of coarse the power through J10.

So how does this happen? Something is actively pulling these lines. When conneting a aardvark the low levels do become a bit higher, but this indicates even more that something active is pulling these lines.

Thanks,

Martin.

Martin

Attached is the PDF file.

For I2C_SCL2, please make sure R100 , R85 are not populated, R68 is populated. This will isolate the 1046 from the I2C_SCL2.

For I2C_SDA2, please make sure R101, R86 are not populated, R67 is populated.

INT053A_PCB.pdf

Thanks

David