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BQ24160: BQ24160 operation

user5013697
Intellectual 490 points

Part Number: BQ24160

Hello

please let me clear about BQ24160 operation.

<about Output voltage>

1:  As my understanding, If IN or USB pin is connected to AC adapter/USB-Vbus,  Is System voltage (output form BQ24160)  set around 3.7V.

    Is it correct?

2:  when IN or USB pin is connected and battery voltage is above 3.7V (Vsys), in this case, Does BQ24160 output battery voltage straightly?

<about USB Charging>

Customer will use tow Li-ino battery in parallel  (they use tow BQ24160 individually)  ,in this use case,  please tell us below.

1: Can I use BQ24160 in parallel?  if it is OK, are there any problem if D+/D- line divided to each BQ24160?

   I think it has some problem in USB-Enumeration process.  could you please any advice.

Best regard

Yamane

Question BQ24160.pptx

 

  • 0
    TI__Guru**** 181076 points

    Regarding output voltage 1 and 2, yes.  SYS is regulated to the higher of MINSYS (default of 3.7V) or VBATREG+3% if not charging or VBATREG+ICHRGE*RDSON if charging.

    Regarding usb charging 1, if using two bq24160 in parallel with IN/USB and BAT pins tied together, only 1 set of D+/D- can be used to perform primary USB detection (bq24160 does not perform enumeration).  Also, since both have the same I2C address, a switch on the I2C lines is required to allow independent communication.  The SYS pins should not be tied together because each charger will be regulating to a slightly different voltage.  Lastly, once the battery voltage is near VBATREG and enters constant voltage mode, it is recommended to disable charging of one charger so that only charger controls termination.  Otherwise, there can be oscillations. 

     

  • 0 in reply to Jeff F
    TI__Guru**** 181076 points
    Just curious about the need for dual input? Is it for higher current charging?
  • 0 in reply to Jeff F
    Intellectual 490 points
    Thank you for your reply.

    According to your answer, I understood that it is not able to use USB charge in same time.
    So Are there any Timing chart of USB detection when QB24160 charged from USB port.
    ( Timing chart for D+, D– Based Adapter Detection for the USB Input)

    Best regards
    Yamane
  • 0 in reply to user5013697
    TI__Guru**** 181076 points

    D/s section 9.3.10 explains the detection process, which is compatible with USB BC1.2 primary detection specification.

  • 0 in reply to Jeff F
    Intellectual 490 points

    Thank you for your answer.

    please answwer one more question.

    Pls see attached ppt file,

    Question BQ24160_2.pptx

    QUESTION:

    How long time does BQ24160 spend in USB detect process?

    (How long time does BQ24160 spend to detect DCP/CDP/SDP.)

    I think this process is depend on Charger IC(BQ24160).

    And if any error happen, I think the device will re-try the detect process. If it is correct, how many time does the device do?

    I would like to know the period which is until DCP/CDP/SDP detected from USB port connected.

    best regards

    yamane

  • 0 in reply to user5013697
    TI__Guru**** 181076 points
    bq24160 only performs primary detection between DCP (1.5A) and SDP (100mA). It does not perform secondary detection per USB BC 1.2 spec. The process can take as long as 500ms from the time V(IN) rises above UVLO voltage. If there is an error, the device defaults to input current limit of 100mA.
  • 0 in reply to Jeff F
    Intellectual 490 points
    Thank you but Pease tell me below.

    1: what does it mean primary detection and secondary detection?

    2: Does not BQ24160 re-try the DCP/SDP detection if it fail in the detection process?
    Is it mean that if there is an error in the process at once, the device defaults to 100mA limit setting?

    Best regards
    Yamane
  • 0 in reply to user5013697
    TI__Guru**** 181076 points

    The governing body for USB published the BC 1.2 battery charging spec many years ago.  There are different steps during detection.  First is to establish communication.  Next is primary detection of either adapter (DCP) or USB port (SDP/CDP).  Next is secondary detection that further segregates the DCP ports and whether the USB port is SDP or CDP.    The spec gives timeouts for each step. Regardless, the intent is allow the charger to provide just enough power to the system host so that it can enumerate with the USB host and find out more information about how much power the USB port can provide.

    If the bq24160 does not establish communication or complete primary detection within the timeouts specified in the datasheet, the device defaults to 100mA input current and waits for the system host to enumerate with the USB host and then increase the input current limit to a safe value.