TUSB2E11EVM: Question regarding TUSB2E11EVM

Hi Team,

Adding one more question:

customer find adding the value in the red point then it works, can you help to explain how to set this value appropriately? Thanks.

BRs.

Frank

Hi Frank,

What software is your customer using? We typically use ADS for our IBIS models, where we don't see this error with these C_comp values.

Frank Cai said:

My customer is now evaluating TUSB2E11EVM and they find the following error, could you please check whether there are some wrong setting? Thanks.

For the 'Repeater Type' parameter, it looks like this is just checking for compatibility and may not necessarily gating performance of the model.

Can the customer still run the model even with the compatibility error? How does the model look with the current values for C_comp?

Thanks,

Ryan

我们用的是ANSYS的circuit design

Hi Yifeng,

Can you send a link to the software we use? That way we can try to reproduce on our side. 

Ryan Kitto said:

For the 'Repeater Type' parameter, it looks like this is just checking for compatibility and may not necessarily gating performance of the model.

Can the customer still run the model even with the compatibility error? How does the model look with the current values for C_comp?

Can you also double check these questions?

Additionally, if possible, replies in English would help me understand your responses better.

Thanks,

Ryan

1、I set this value to 10pF according to the specification sheet, and the simulation effect is very good

2、At present, we have not adjusted the gear level. May I ask about the default settings, the strength and settings of the model's gear level

3、But according to the application guidance, it seems that this chip supports adjusting gears. Can this function be achieved?

thanks

Hi Yifeng,

yifeng GUO said:

2、At present, we have not adjusted the gear level. May I ask about the default settings, the strength and settings of the model's gear level

3、But according to the application guidance, it seems that this chip supports adjusting gears. Can this function be achieved?

What do you mean gear levels? Do you just mean the equalization levels? Yes, you can adjust the equalization, as well as the amplitude and pre-emphasis.

The datasheet has more details about what these default settings typically are, as well as the value of these settings.

The user's guide should also have some information about these settings.

Thanks,

Ryan

How should we understand the differences between these modes?If we just want to automatically trigger the BC1.2 function of the chip, is the setting in the second line sufficient and And then read back the result based on the GPIO status?

Hi Yifeng,

The first two modes on this table are for BC1.2 detection, while the bottom two modes are for BC1.2 advertisement. Depending on what you kneed, you should set these pins accordingly.

If you are looking for BC1.2 detection to occur only when VBUS is connected by dividing the signal to a high-voltage on the SDA pin, then you can do that, yes. You can also just pull the pin high, so that BC1.2 detection is always on.

The status of the BC1.2 detection will be output from GPIO2 and 1, yes.

Thanks,

Ryan

hi ，I tested on your demo EVB, but found that the chip is not working. If I want to configure it to a mode that does not require BC1.2 and IIC (the chip works automatically when powered on), the current setting is SCL grounded through 90R and SDA grounded directly. Is the configuration correct? Are there any other things to pay attention to?

Hi Yifeng,

What do you mean by the chip not working? Like, you cannot get any signal through the TUSB2E11EVM, or any USB connection? 

For the TUSB2E11EVM, there should be header pins for controlling the SDA/SCL pins to correctly configure the EVM. You should be able to use these jumper settings if you don't plan on using I2C or BC1.2:

What settings are being used for the other GPIO? What do you have the EVM connected? An eUSB2 SOC to a flash drive, or a different connection type? What about the VBUS jumpers?

Thanks,

Ryan

1、I connected it according to the design instructions, with SDA/SCL connected to GND

Q：Does this correspond to the non IIC mode and not requiring BC1.2

2、 ，I don't use J1 and provide external 5V power supply  though J12

I test 3.3/1.8/5v on EVB and they are OK

Hi Yifeng,

yifeng GUO said:

Q：Does this correspond to the non IIC mode and not requiring BC1.2

Yes, with both to ground, it would be set to I2C mode with BC1.2 disabled.

yifeng GUO said:

I test 3.3/1.8/5v on EVB and they are OK

Does the EVM work when you supply those voltages? Or is the board still not working?

yifeng GUO said:

2、 ，I don't use J1 and provide external 5V power supply  though J12

Do you have the EVM connected to an eUSB2 SOC that's acting as a device or a host?

Looking at the schematic, you may need to supply 5V to both pins of the jumper. Have you already tried this?

Thanks,

Ryan