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bq24292i otg and charging simultaneously

Izabelle Lima
Prodigy 50 points
Other Parts Discussed in Thread: BQ24190

is it posible ? If so, in hardware, do i need multiplex D+/D- for usb connector and microprocessor or data is sending by I2C interface ? One other question, How is the detection for wall adapter or usb connector ? I want to have just one connector in my board. I have read the datasheet but this points are not so clear.

Thanks

  • 0
    TI__Mastermind 31120 points

    Communication between the host and charger is done with I2C.  This is a slave device so one can program the registers and read back from the registers the programmed information along with the status, fault and IC registers.

    D+D- is not used on this part.  One the bq24190 it is used only to detect a USB port with no communication available.

    You can have one USB connector that can connect to an adapter or USB host.  If using a USB port, one should use a USB transceiver in the device to communicate with the host and then set up the charger accordingly.

  • 0 in reply to Charles Mauney
    Prodigy 50 points

    Ok, I've just figure out the detection mechanism. But, the D+/D- lines used for detection are the same for the communication between the host and the i.MX53(acting as device). So, my final question is: during the detection period, do I need to isolate the communication lines for the i.MX53? The i.MX53 data lines will be damaged if it remains on the same bus during the detection?

  • 0 in reply to Izabelle Lima
    Prodigy 50 points

    Please, answer my question !!!!!!!!

  • 0 in reply to Izabelle Lima
    TI__Mastermind 31120 points

    I do not know if your device will be damaged.

    We use low level current sources to monitor the D+D- line and would not think that would damage anything else, but since I do not know how sensitive your device is, I can't answer your question.

    After we do our detection we isolate the lines from our IC.

    the only thing I would think would cause an issue is the routing of the connections with high speed communication and possible reflections.

  • 0 in reply to Charles Mauney
    Prodigy 50 points 

    Dear Sir or Madam,

I'm using BQ24190 in one my projects. My ion-lithium battery has three 
terminal: positive, therm and negative. I'm confused how to connect 
battery therm pin to the BQ24190.
Do I have to connect it or not? Is so, how do I connect it? To the pin 
TS1 or TS2?

Another question: I have two batteries in parallel. Each one has its 
own therm pin. Do I have to connect each one to one TS pin? I mean: 
Batery#1 therm pin to TS1 and Batery#2 therm pin to TS2?

I look forward to hearing from you soon.

Regards,
Izabelle Lima.
  • 0 in reply to Izabelle Lima
    Prodigy 50 points

    Hi, I'm still waiting an answer for my question.

    Thanks.

  • 0 in reply to Izabelle Lima
    TI__Mastermind 31120 points

     

    BAT+ goes to BAT

    BAT- goes to ground

    Thermistor wire goes to one of the TS pins and the other battery TS goes to the other TS.