• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 82 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.

BQ25790: Function under certain situations

Shuhei Goto
Intellectual 1410 points
Part Number: BQ25790
  • Hi team,

Customer have following questions.

Could you give me answer or comment?

[Status] Charge the 2-cell Li-ion battery 

  • Case1:  Power supply from USB2.0(PC)
  • Q1: Is it possible to charging limited to 5V/0.5A ?

  • Case2: Power supply from USB AC adaptor(5V/2A)
  • Q2: Is it possible to charging limited to 5V/1.5A ?

  • Case3: Power supply from USB-PD AC adaptor
  • Q3: Is it possible to charging limited to 10W ?

  • Case4: Power supply from 10-16V
  • Q3: Is it possible to charging with specific supply? For example 10W.

Kind regards,

Goto

  • 0
    TI__Guru*** 144480 points

    Hi Goto,

    Charge current is controlled by the charge current I2C registers.  Input current from an adaptor or port is controlled by the input current I2C register.  At power up, the default charge current is set by the PROG pin resistor to either 1A or 2A.  The input current registers is set to the lower of the value negotiated by the D+/D-  pins or the resistor set clamp per the ILIM_HIZ pin.  The D+/D- is USB BC1.2 and many high voltage DCP (like QC2.0) compatible.  The host can always change the input current limit register and disable the ILIM_HIZ pin with I2C writes.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Intellectual 1410 points

    Hi Jeff, 

    Thank you for supporting.

    As a reminder, are all four of the above conditions possible?

    I understand that the input current limit can be adjusted by setting the ILIM_HIZ pin and IINDPM register.
    What is the charge current I2C register? REG06?

    Regards,

    Goto

  • +1 in reply to Shuhei Goto
    TI__Guru*** 144480 points

    Hi Goto,

    Yes, after input current limit and charge current registers are configured by the host. ICHG is REG0x03-0x04.

    Regards,

    Jeff