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USB-PD-CHG-EVM-01: is the buck(tps56339) the that what is blocking this EVM from getting work with ONE battery cell ？

GeneralQuin
Prodigy 70 points
Part Number: USB-PD-CHG-EVM-01
Other Parts Discussed in Thread: BQ25960, TPS25751, USB2ANY

Tool/software:

hi， there. 
im very interested at the EVM 。 however for my powerbank application， only one battery cell is allowed to implement everything . however， even though the BQ is able to work together with 1s-4s battery， but the EVM said its working for 2s-4s。 id like to know whether its possible to remove that buck and connect another 5V boost to get the EVM working as expected. 

for my application， the key is to charge a single battery cell with 40W(at least). so i will have to use another none-ti solution to do this. and i  have to ultilize my own MCU to control the PD on the EVM ， my further question is ， is that possible that as the I2C of BQ is routed to the pd controlled，i can still get  information of BQ from the I2C that i will connect between PD controller and the MCU 。

thank you

  • 0
    TI__Mastermind 31332 points

    Hi, 

    Thank you for reaching out!

    Is this application a sink-only design (i.e. battery charging only) or will it be dual role power (i.e. battery charging and OTG mode)?

    What are the power profiles? 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    Prodigy 70 points

    hi， thank you for your quick reply。its a highend powerbank。 so its a DRP. 
    input: 60W to 100W， type C
    output：type C and magsafe.       40W/ or at least to power a magsafe 15W。 
    cell：ONE

    so i have to use another charge bump to charge the internal battery cell. BQ25960 cant reach that high power.



    the key is that only one battery cell is allowed. 



  • 0 in reply to GeneralQuin
    TI__Mastermind 31332 points

    Hi, 

    Thank you for clarifying the application. 

    GeneralQuin said:
    im very interested at the EVM 。 however for my powerbank application， only one battery cell is allowed to implement everything . however， even though the BQ is able to work together with 1s-4s battery， but the EVM said its working for 2s-4s。 id like to know whether its possible to remove that buck and connect another 5V boost to get the EVM working as expected. 

    Your understanding here is correct, the EVM is designed to work for 2s-4s because PP5V on the PD controller will need to be provided with 5V for sourcing. 

    Replacing the buck converter with a boost converter in your design should achieve that. 

    GeneralQuin said:
    for my application， the key is to charge a single battery cell with 40W(at least). so i will have to use another none-ti solution to do this. and i  have to ultilize my own MCU to control the PD on the EVM ， my further question is ， is that possible that as the I2C of BQ is routed to the pd controlled，i can still get  information of BQ from the I2C that i will connect between PD controller and the MCU 。

    The TPS25751 PD controller supports I2C passthrough. The MCU can read and write to BQ through the PD controller via 4CC commands I2Cr and I2Cw. 

    See below: 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    Prodigy 70 points

    OKAY, thank you very much 

  • 0 in reply to Aya Khedr
    Prodigy 70 points

    further question is， is that possible that for me ， i can use any USB2I2C bridge to write/read to/from the PD。  or I have to select the USB2ANY tool suggested by TI ?

  • +1 in reply to GeneralQuin
    TI__Mastermind 31332 points

    Hi, 

    USB2ANY is not supported by the PD controller. We use the Aardvark tool internally for development. However, any I2C adapter can be used. 

    Best Regards, 

    Aya Khedr