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Part Number: TPS65987EVM
I’m an FAE in the Israeli team,
I am currently supporting a customer,
The customer is using the TP65987EVM with display port sink board from 10G expansion EVM attached (image attached),
He is facing the following three problems:
From seeing the pictures you can see that there is a collision on the line and he does not understand why this happens.
The problem is that when he connects the power back it does not change back to become a charger of the laptop unless he reconnects the usb-c . What should he change in the configuration to enable this to happen.
Can you please help me with the problems he is facing?
For your three problems:
1. I am not sure what lines you are looking at. I2C2 (which is used for FTDI) has a pullup, which is not reflected in the scope shot. Also, I2C2 is only used in debug mode through the GUI for the EVM.
2. There could be some equalization issues occurring when the phone is driving the super speed lines. You could try doing 4 lane DisplayPort if your phone can support that.
3. Check to see if GPIO21 is set to Barrel Jack Detect Event. If it is not, enable it. This will check to see if the barrel jack has been connected and should enable a power role swap when it is.
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In reply to Emma Hoying:
this is my reply from customer:
As can be seen in the Scope picture it is not a problem of pullups. You can see in a train of clocks that for some bytes it is 3.3V amplitude and for some it is about 1V. I don’t have any explanation except bad IC.
May be it is easier and cheaper to send a new EVB.
It is not a problem of picture through Display port . it is a problem of negotiation . you can see on the pictures that when I connect the laptop the led of the DP (d13) is lit even when DP cable is not connected to EVB.
On the second picture when the smartphone is connected the Led is off.
If the debug function was functioning I could capture the status and analyze it but unfortunately it does not function.
That solved this problem, thanks.
In reply to Victor Levy:
Glad to hear the GPIO event solved one of your issues.
I2C works through pull ups, so if the lines are not pulled up, the communication will not work. If I2C2 is broken, you should order a new board. Your I2C communication usually look like this on the TPS65987EVM.
Thank you Emma,
regarding the second question my customer asked, can you please help me answer his comment(resending)?:
a. It is not a problem of picture through Display port . it is a problem of negotiation . you can see on the pictures that when I connect the laptop the led of the DP (d13) is lit even when DP cable is not connected to EVB.On the second picture when the smartphone is connected the Led is off.
As discussed above, please order a new board for your customer or ensure that I2C is pulled up by soldering connections. I2C needs a pullup to work and if their I2C lines are not pulled up, the communication will not function properly.
I have ordered a new board for the customer(TPS65987EVM) as you have advised,
He is still having the same issue with the display port function as it is working with the laptop but not with his smartphone.
It is a Samsung S10e and it works with any adaptor that is on the market but not with the TI board.
The debug problem that was on the previews board is happening on the new one.
See attached project files.
Can you help me with this?
Thank you for the support.
Do you or your customer have a PD analyzer to read the PD messaging being sent between the phone and EVM? The first step for displaying video over Type-C is to negotiate and accept the display port alternate mode. In your previous post, you state "on the second picture when the smartphone is connected the Led is off". The purpose of this LED it to indicate that HPD (hot plug detect) has gone high. So the fact that this is not going high shows that a display port connection is established and HPD is not going high (cause for the display issue) or that their is no DP alternate mode negotiated between the two devices. Both would cause for the video not to display, and you need a PD analyzer to help isolate where the issue could be occurring.
This is the one I typically recommend customers use.
In reply to Adam Mc Gaffin:
Yes the customer has total Phase PD analyzer and attached are the captured negotiation of 3 scenarios
The configuration in the last post for checking.
samsung s10e with TI evm.zip
With the Samsung and TI EVM, the Samsung device never sends the VDM:Discover Modes message, so the DP alternate mode is never discovered and entered. With the MacBook pro and TI EVM, the MacBook does send this discover modes message, so the two devices are able to discover and enter into the DP alternate mode. I am having difficulties opening the Samsung and dongle file so I cannot review them fully, but if this test works, it is probably because the dongle is sending the VDM:discover modes message and the two devices are able to enter into the DP alternate mode.
Since the Samsung phone is the one acting as the DFP. it should be the one to send out the request for VDM alternate modes.
My customer answered the following:
I have checked with another product which is based on Cypress component with the same Samsung S10e and it works. Here is the log file from cypress analyzer that succeeded to charge and send DP signals.
I can’t accept that with Cypress PD controller it works and with TI not.
samsung usb lock.zip
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