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TPS65987D: Questions about USB PD TI solution based on TPS65987 and BQ25703

Pol REYMOND
Intellectual 2090 points
Part Number: TPS65987D
Other Parts Discussed in Thread: BQ25703, TPS65987, , BQ25703A

Hi team,

You will find below information about what customer would like to do, how they think to do, what they are working on and a list of technical question.

  • What they would like to do and how we think to do :

Case/level 1 : BATTERY connected to a dual role PD device

Their design would be based on the references TPS65987 and BQ25703.

Regarding their target applications, the minus operating temperature of -10°C of the TPS65987D could be blocking. They have understand that the limitation was linked to the package material. Could you please confirm?

What degradation could occur below -10°C? At -25°C for example?

 

USB PD controller shall be able :

  • to control the DC-DC in two mode : SINK (Charger) or SOURCE (battery provides energy to an external SINK). BQ25703 is design for battery charging. Can it be used in reverse power transfer? (BQ25703 using battery to supply a SINK [5-20V])
  • to store battery charging information through the fuel gauge I2C interface. Is-it possible to do this with the TPS65987? 

 

Case/level 2 : battery with host system

The HOST shall be able to get back battery charging  information. Is it possible to get back these by the USBx.x link or by the dedicated CC1,2 link between battery and external devices.

 

Do you think that the TPS65987 is suited for their applications?

 

  • what they are working on?

They are working on two evaluation boards TPS65987, both connected to a separated PC, and linked between them by an USB PD cable.

Question about the SOP :

Could you confirm that the SOP is an information exchange, flowing through CC1,2 between  DFP and UFP?

They are trying to exchange virtual battery information using the SOP.

The following failure message appears :

 

But the value in register 0x42 is good!?

 

Does the SOP is fully operating on the evaluation board and software?

(One PC works with WINDOWS 7, the second with WINDOWS 10. Its seems the frequency of message error is more frequent with WINDOWS 7. It’s just a feeling, not a statement.)

 

Thanks in advance for your support on this request.

Pol

  • 0
    TI__Mastermind 36756 points

    Hi Pol,

    We cannot comment on the behavior below -10 degrees C as the device was not validated below -10C. As for the TPS65987D and BQ25703A design, we have a reference design for a power bank on the web using these two devices. TIDA-01627. The TPS65987D is the I2C master for the BQ25703A and communicates what is required on the Type-C PD port to the BQ25703A over I2C.

    SOP is used by the Type-C PD specification. They can communicate from one side of the Type-C cable to the other side using an Alternate Mode. You could follow the following app note which describes how to implement this:

    If this answers your question, PLEASE select This resolved my issue

    Thank you,
    Eric