• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 41 subscribers
  • Views 978 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TIDA-01627: Power Bank design questions

Juan Jose Frutos Andreu
Intellectual 610 points

Part Number: TIDA-01627

Hi,

I am facing a battery pack design. I give it a thought and I realise that will be very interesting to make a power bank compilant with the USB PD as the battery for my company future products.

I have review all the TI PD products and I want to know if there is any way to command a stop in the power supply from the power bank to the sink system, in order to turn off the system.

Also will be interesting to have a way to notice to the sink system the state of charge of the battery.

Can this functionalities beeing implemented using the USB PD protocol? Shall I desing the system with an additional GPIO interface in order to achieve this functionalities?

Any idea will be welommed!

Best Regards,

Juanjo

  • 0
    Intellectual 610 points

    Will be any drawback in the design if the SYS signal is taking out the system using an additioal connector in order to make the measurement of the battery state and to power the system?

    I have readen the BQ25703A datasheet again looking for an I2C register with actual battery voltage but I dind't find it... does the BQ25703A have this functionality?

    Best Regards,

    Juanjo

  • 0 in reply to Juan Jose Frutos Andreu
    TI__Expert 6430 points

    HI Juanjo,

    First of all apologies for the delay in responce.

    Now coming to your queries and below are the answers:

    1. There's no way to stop the PD power source by just sending a message. However, you could do a power role swap in which case the direction of power will reverse and the power bank will start charging.
    2. You can do this but you'll need some batter guage and a microcontroller to make the battery measurenment and then relay it to the sink.
    3. These functionalities can be acheived but these are beyond the PD specifications and therefore will need external components on the board
    4. Yes, you can bring out SYS signal out there's no issue in that.
    5. You can read ADCVSYSVBAT (0x2C) register to check battery voltage. Please check page 66 of the BQ25703A datasheet for more information.

    Thanks,

    Rahul

  • 0 in reply to Rahul Sharma16
    Intellectual 610 points

    Hi Rahul,

    Thank you for the response.

    We would like to have the TPS65987D configuration of the TIDA-01627, in order to take it as an example.

    We are looking for the correct way to controll the BQ25703A from the TPS65987D but we are not able to find any reference.

    BTW we do not relay that in the provided Application configuration tool Manual there is enough information for making the TPS65987D controll the BQ25703A.

    Can the same master of the TPS65987D look at the register of the BQ25703A. in order to know the battery SoC? Or it is non recommended?

    Best Regards,

    Juanjo

  • 0 in reply to Juan Jose Frutos Andreu
    TI__Mastermind 36751 points
    Hi Juanjo,

    The following app note can be followed for making the TPS65987D control the BQ25703A: www.ti.com/.../slvae18.pdf

    Thank you,
    Eric