TPS65988EVM: The TPS65988 PD controller does not PON while the phone insertion in J1 conn- PD Port1

Hello,

I've assigned this to the relevant expert who will get back to you soon

Hi Adam,

Could you/expert, please respond?

Thanks

Vitaliy

Hi Vitaliy,

Sorry to reply late.

One question,

Did you use the default configuration in Application Customization Tool for this application scenario?

Thanks.

Bing

Hi Bing,

What do you mean by default configuration?

I am using the Advanced template type for TPS65988 DRP, prefers power source, or prefers power source and tethered cable.

I don't have the real tethered cable, but the phone in J1 can be inserted only in one direction. The reversibility is protected mechanically. Does it make sense to use DRP, prefers power source and tethered cable or DRP, prefers power source?

The pjt and bin files of my project are enclosed.

Thanks

Vitaliy

POC PD Serial Flash ADV_CONF.zip

Hi Vitaliy,

I will try the pjt & bin files you uploaded, and will give you a feedback.

Thanks.

Bing

Hi Bing,

Could you please advise and provide your feedback.

Thanks

Vitaliy

Hi Vitaliy,

According to the pjt file, I tried it on TPS65988 EVM board and it works, below is the details:

Try to reproduce  the Experiment 1a:

1. Use a DRP board (prefers DFP) to emulate a phone,;

2. Download the pjt into the 988 device, and then EVM Port A corresponds to J1 port and EVM Port B corresponds to J2 port, and use a C-to-C cable to plug in Port A, then the other side of the cable can be regarded as J1;

3. Cut off the power of 988 EVM to emulate dead battery mode;

4. Use the DRP board to plug in J1;

Below is the result:

As the POWER-Z USB Meter shows, the DRP board (phone) can power J1 port.

Try to reproduce the Experiment 1b:

1. Firstly use an A to C cable to plug in a Laptop A receptacle;

2. Then plug C-side into J1;

Below is the result:

The LED on board present, and the device can enter debug mode. From the row of "Acting as Legacy", it can be seen that the port can't support PD, it can just used as a legacy sink cause no CC line in A-to-C cable.

Try to reproduce the Experiment 2:

1. Connect DRP board to J2 through a C-to-C cable;

below is the result:

J2 port can be powered by DRP port.

From the above results, it seems that J1 can be power by DRP board, i.e., by phone. And I check the connection of TPD6S300 based on TPS65988 EVM User Guide, below is the circuit of TPD6S300:

Pin RPD_G1 & RPD_G2 are connected to their relevant CC line pins. 

Additionally, the waveform of CC lines on J1 connector is as below:

The behavior of CC1 & CC2 is normal according to the result.

According to above results, I suggest that check the hardware circuit. If CC2 follows CC1, is it possible that short issue occurs on your board? 

In the Experiment 3, when open the trace from C_CC2 to RPD_G2, then every phone connection is enabled, have you tried both orientation of the connection?

Thanks.

Bing

Hi Vitaliy

It is nice to find out the cause. And if the problem has been solved please close the question.

Thanks.

Bing