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Original question:

BQ24392: The reason for CHG_DET not detect

BQ24392: Detection when the host side is Type-C (1.5A ~ 3A, PD)

kz_sk
Intellectual 395 points

Part Number: BQ24392

We design products on the "Device" side.

The host side is type-A or type-C. The device side is a Type-C product.
Full duplex communication is not used, only half duplex communication is used.

2024/1/30 edit↓ 

Purpose of use: If it is "SDP" ,"PS,2 Charger", "Non-compliant USB-Charger" and "Any Device"...Charging is prohibited
Charging is permitted only in the green frame in the table below. Charging is prohibited in orange and yellow frames.

The pin settings are below.
GOOD_BAT... Always connected to Vbus(5V)
CHG_DET, CHG_AL_N....Enable the charging IC using these 2 pins and the output pin of the gauge IC. I am thinking of using a logic IC like the circuit below.

If the host side is Type-A, I think the "switch status" in Table 1 is as per the data sheet.

If the host side is Type-C and the CCpin is 22kΩ (1.5A output), which state does this IC show in Table 1? Is it "any device"?

Host (type-C) --- Device (type-C) also communicates using D+ and D- lines, so I want the switch status to be "connected".

What should I do in case of "no-connected"?

Also, which state in Table 1 will it be when it supports Type-C PD (power derevery)?

  • 0
    TI__Guru**** 158245 points

    Hi Sakamoto:

          Do you have PD controller in your design or just 5.1k on CC pin?

         iF just 5.1k PD on CC pin, the host will be configured as DFP and turn on Vbus , the state should be same as table 1, if PD controller is used in your design, it could be different story.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Intellectual 395 points

    Hi Brian

    There is no PD controller. 5.1kΩ is pulled down to CCpin.

    If the host (USB type-A) is Default, "Device type" will be detected as shown in Figure 7 below.

    However, if Type-C can output "1.5A" or "3A" other than the default, I would like to know which "Device Type" BQ24392 indicates.

    I don't know whether to perform PrimaryDetection and SecondaryDetection as shown in Figure 7 when the host is Type-C.

    That's why I'm asking this question.


    Also, if the host is Type-C and PD, will detection like the one shown in Figure 7 be performed?

    Also, I don't know which of Table 7 the "Device Type" indicates.


    Regarding the part related to the USB type-C standard, I am having trouble finding materials. Thank you for your guidance.

    The table below is a list of host types when the device is Type-C.

    I would like to know the "Device type" in the "Which of table7?" section.

  • 0 in reply to kz_sk
    TI__Guru**** 158245 points

    Hi Sakamoto::

         BQ24392 is mainly for BC 1.2 detection with DP/DM,  but  Type-C current deliver with CC pins, which  is different from BC1.2, so table  1 in BQ24392 is not applied for type_C current delivery..

        So the current or power for tyep_C  is depends on tyep_C host capability.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Intellectual 395 points

    Hi　Brian

    If the host is Type-C, will the Switch-Status be “No-Connected”?

    In the case of "No-Connected", the D+ and D- pins will be cut off and communication will not be possible, so I am worried about that.

  • 0 in reply to kz_sk
    TI__Guru**** 158245 points

    Hi Sakamoto:

         As I said before, CC current delivery and BQ1.2 are different.

        For BQ24392, it only matters what is connected on Dp/Dm. Even for green table, switch is connected only when GOOD_BAT is high for CDP. in other condition, switch is in Hi-Z state.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Intellectual 395 points

    I may be misunderstanding the functions of "USB SW ON" and "USB SW OFF".
    Is the following recognition correct for the above two functions?
    ・“USB SW ON”…Short the “DX_CON” pin and “DX_HOST” pin by the Switch-Matrix block of BQ24392. Therefore, the host and device can communicate.

    ・"USB SW OFF"...Open "DX_CON" pin and "DX_HOST" pin by Switch-Matrix block of BQ24392. Therefore, the host and device cannot communicate.

  • 0 in reply to kz_sk
    TI__Guru**** 158245 points

    Hi Sakamoto:

       Your understanding for USB SW is correct.

    Regards

    Brian