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BQ25606: Questions and suggestions

Silvia Clemente
Prodigy 40 points
Part Number: BQ25606
Other Parts Discussed in Thread: TUSB320

Hi,

We are developing a kind of power bank solution in order to power up our systems.

We are thinking in a high level architecture like the one shown in the following picture:

The "pogo pin" connector will supply 5V to our system. The microB connector will be used for charging the battery through the BQ25606, we have several questions regarding the architecture.

1. Is the BQ25606 a valid PN for this architecture?

2. The OTG pin shall be conected to the microB connector?

3. Will the BQ25606 supply current through the microB if a PD system is attached to the microB? Or it is needed a PD port controller and a type C connector? In case it is, can you suggest a PN for making this role?

The design will be based on the default configuration such as it appears in the point 9.2 Typical Application Diagram of datasheet. In our case, the battery is single cell Li-Ion of 6000mAh, with maximun charge current of 1C and NTC 10k Ohmios.

Can you suggest a DC/DC converter for the solution? 

Thanks in advance.

Best regards,

Silvia.

  • 0
    TI__Expert 5590 points

    The "pogo pin" connector will supply 5V to our system. The microB connector will be used for charging the battery through the BQ25606, we have several questions regarding the architecture.

    1. Is the BQ25606 a valid PN for this architecture?

    Yes, but OTG cannot be controlled this way. To enable OTG, OTG needs to be pulled high. OTG needs to be negotiated.  

    2. The OTG pin shall be conected to the microB connector?

    No, OTG should be controlled by MCU.

    3. Will the BQ25606 supply current through the microB if a PD system is attached to the microB? Or it is needed a PD port controller and a type C connector? In case it is, can you suggest a PN for making this role?

    BQ25606 can be used if you have a MCU for interface. MicroB is still OK. 

    The design will be based on the default configuration such as it appears in the point 9.2 Typical Application Diagram of datasheet. In our case, the battery is single cell Li-Ion of 6000mAh, with maximun charge current of 1C and NTC 10k Ohmios.

    Can you suggest a DC/DC converter for the solution? 

    Checked our Boost converters online, I am not expert on that. 

    Thanks in advance.

    Best regards,

  • 0 in reply to Hong Mao
    Intellectual 610 points
    Hi Hong,

    Thanks a lot for your quick resposne.

    To put in in a short way, correct me if Im wron, If OTG is pulled high, boost mode is enable, so the BQ25606 can deliver power to the USB microB port looking at the architecture shwon in the figure.

    We won't like to introduce a MCU with our own FW due to this will lead in a longer design stage.

    Could be a good solution, to use the TUSB320 in GPIO configuration, in order to advertise with a GPIO if the attached device is a sink or source? and drive this signal to the OTG pin of the BQ25606?

    Will this be a good solution?

    Best Regards,

    Juanjo
  • 0 in reply to Juan Jose Frutos Andreu
    TI__Expert 5590 points
    The issue is that you cannot figure out the voltage is from external or from OTG when OTG is running. I do not think it is a good idea to detect current sink or source. If you have dedicated OTG cable for OTG, you can use the cable to trigger OTG.
  • 0 in reply to Hong Mao
    Prodigy 40 points

    Hi Hong,

    Just like you comment us, Can the OTG's configuration be similar to the configuration of picture, being our device the A-Device? 

    In the case that we don't use the boost mode, Could we connect OTG to GND? And then we use this port only to charger but not deliver power from the battery to other portable devices. 

    Best Regards,

    Silvia.

  • 0 in reply to Silvia Clemente
    TI__Expert 5590 points
    Yes, you can connect OTG to GND if it is not used.
  • 0 in reply to Hong Mao
    Intellectual 610 points
    Hi Hong,

    Will we have any drawback, if OTG is tied GND, or just that the usb port shall be used just for charging? and not for power delivery?

    Regards,

    Juanjo
  • 0 in reply to Juan Jose Frutos Andreu
    TI__Expert 5590 points
    Juanjo:

    I do not quite understand your question. If you do not want the battery to power other device, you tie OTG to GND. If you want the battery powered other device connected at USB port, OTG pin needs to be pulled high by anyway.
  • 0 in reply to Hong Mao
    Intellectual 610 points
    Hi Hong,

    Thanks a lot for the support given.

    Yes I think both of us get lost in the translation.

    An additional question, what is the voltage level "REGN" in the Figure 18 of the bq25606? (the one that is supplying the Resistors that biases the NTC of the battery) is the REGN pin?

    I can not find any clue about this in the datasheet.

    Thanks a lot for the support,

    Best Regards,

    Juanjo
  • 0 in reply to Juan Jose Frutos Andreu
    TI__Expert 5590 points
    It is regulated between 5V to 6V depending on VBUS
  • 0 in reply to Hong Mao
    Intellectual 610 points

    Can this NTC be powered just during battery charguing?

    The turn on / off system is designed to drive the signal to the enable of a DC/DC coverter, which provides the 5V output. Will be any issue if the net is powered from this DC/DC? (untill the system is not powered on, the thermistor net wont be powered).

    Please answer both questions.

    Best Regards,

    Juanjo

  • 0 in reply to Juan Jose Frutos Andreu
    TI__Expert 5590 points
    Sorry, I could understand your questions. Could you elaborate your questions?