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USB-PD-CHG-EVM-01: TPS25750 high current drawn from battery

Jozef Augustín
Prodigy 60 points
Part Number: USB-PD-CHG-EVM-01
Other Parts Discussed in Thread: TPS54531, BQ25798, BQ25790, , TPS25750, EV2400

Tool/software:

Hi

I'm using TPS2570 in my design with the same configuration like on EVM (BQ25798, TPS54531). I discovered there is high current when my device is turned off. I tried to write the same configuration in to the eeprom on EVM and checked the current there. And there is 2.78mA from the battery to the EVM when everything is turned off. 

According to the datasheet, TPS should enter the sleep mode after time T of inactivity - which is few hundreds milliseconds. IPP5V,Sleep should be 2uA and IVIN_3V3,Sleep should be 56uA.

Why there is current 2.78mA from the battery on EVM? 

Configuration:

-power sink and source

- max sourced 100W

- max consumed 100W

- preferred role power source

- no USB data

- no support BC1.2

- no vendor ID

- no product ID

- charger BQ25790 or 25792

- bat voltage 12.6V

- battery charging current 1A

- termination current and precharge 0.04A

Thank you. 

Jozef Augustin

  • 0
    TI__Genius 9740 points

    Hi Jozef,

    We have received your query and are assigning a team member to look into this. Please give us some time to provide a response.

  • 0 in reply to Alex Liu
    TI__Genius 11630 points

    What is the connection status of the device during this time? Is the current flowing into or out of the battery? What path are you measuring current through? Are you able to provide a block diagram of what you're seeing/your design?

    Regards,

    Conner

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Hi.

    Here is my procedure: 1. connect battery to the EVM. 2. connect PD charger to the EVM. TPS negotiate charging parameter with charger, charging is in progress and everything works great. 3. Then I disconnect the USB-C from EVM and there is 2.7mA current OUT of the battery. After one hour there is still 2.7mA out of the battery.  Nothing else is connected to the EVM. Only battery and external 10k thermistor. 

    Thank you

    Jozef

  • 0 in reply to Jozef Augustín
    TI__Expert 5820 points

    Today is holiday in USA please allow some time to get back to you. 

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    Thank you for the detailed description of your setup. Can you read the BQ devices registers? 

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Yes of course. 

    I read registers when device was idle (as on picture I sent earlier). 

    2526.BQ25798.txt 
    * Created: Wed Sep 04 09:25:29 CEST 2024
*
* Format: Register Name  tab Character,\t  Register Address  tab Character,\t  Hexadecimal register value.
* Device: BQ25798
* BQZ Container: Charger_2_00-bq25798.bqz
*
REG00	02
REG01	04EC
REG03	0064
REG05	BB
REG06	005A
REG08	0D
REG09	05
REG0A	A3
REG0B	00DC
REG0D	4B
REG0E	3D
REG0F	A2
REG10	80
REG11	00
REG12	00
REG13	01
REG14	1C
REG15	AA
REG16	CC
REG17	7A
REG18	54
REG19	0032
REG1B	00
REG1C	00
REG1D	01
REG1E	00
REG1F	00
REG20	00
REG21	00
REG22	00
REG23	00
REG24	00
REG25	00
REG26	00
REG27	00
REG28	00
REG29	00
REG2A	00
REG2B	00
REG2C	00
REG2D	00
REG2E	30
REG2F	00
REG30	00
REG31	0000
REG33	0000
REG35	4E84
REG37	0000
REG37	0000
REG3B	0000
REG3D	0000
REG3F	0000
REG41	0000
REG43	0000
REG45	0000
REG47	00
REG48	19

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    My apologies Jozef, the previous image did not upload properly and shows up as a broken link. I am going to send the thread the the BQ Team and have them review your register values for the cause of the undesirable current draw. 

    Regards,

    Conner

  • 0 in reply to Conner Gillette
    Prodigy 60 points

      I don't understand. I sent only 2 attachments - the picture of connection and values of registers. Which one has a broken link?

     Thank you, I'll be waiting for your reply. 
  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    Picture of connections must be the broken link. I can see the register values you provided.

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    there is picture of connection

  • +1 in reply to Jozef Augustín
    TI__Intellectual 1110 points

    Hi Jozef,

    I'm from the BQ team. I do not see any obvious issues with the registers. The likely cause of this is pullups on the EVM connected to SYS that are still drawing current. The SYS pin of BQ25798 on the USB-PD-CHG-EVM-01 powers the 5V buck converter. If a battery is installed, it appears buck converter will see the SYS voltage, causing the additional current.

    Regards,

    Jared Baxter

  • 0 in reply to Jared Baxter
    Prodigy 60 points

    Sorry I clicked by mistake on "This resolved my issue".


    USB-PD-CHG-EVM-01 is a reference design how to use TPS25750. When I want to use TPS25750 in dual role configuration (as a power source and a power sink), the device has to be powered by 5V buck converter (according to this topic).   

    Can you give me any recommendation how to change your reference design to achieve low current consumption form battery? 

    Thank you 

    Jozef

  • 0 in reply to Jozef Augustín
    TI__Guru**** 151535 points

    HI Jozef,

    The BQ25798 Iq values are shown below:

    In battery only (no VBUS) or with VBUS voltage applied and EN_HIZ bit=1 or ILIM_HIZ pin = 0V, the charger's max Iq is 24uA.  For lower Iq, you can add an external NMOS shipFET, driven by charger's SDRV pin, to prevent current flow from BAT to SYS. In ship mode, the charger's I2C registers are still readable.  In shutdown mode, the registers are not readable and reset to defaults. In both ship and shutdown mode, the charger's BATP pin connects to the battery pack and draws the Iq shown above.  Ship and shutdown modes can only entered when VBUS < UVLO and auto exit when VBUS voltage> UVLO is applied.

    Alternatively, you could add your own PMOS FET that isolates the charger's BAT and BATP pins from the charger completely. A separate signal would be needed to drive the PMOS FET's gate.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 60 points

    It seems there is no problem with the charger. Let's go back to TPS25750.

    I've made some measurements and here is the result. 

    I measured the current in these two places and it seems there is a problem. Procedure is the same as I wrote earlier. 1. connect battery 2 . connect USB 3. disconnect USB and then I measure the current.

    According to the datasheet there should be 2uA on 5V and 56uA on 3v3. 

    I have 2,3mA on 3v3 and 215uA on 5V

    It seems TPS is not in sleep mode. 

     

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    It is possible that there is activity occurring from the below list of activity:

    Are you able to monitor the I2C traffic to see if there is traffic during the period in which you measure current?

    Regards,

    Conner

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    No. There is no traffic after USB is disconnected. (I2C connected to EEPROM and charger)

    All GPIOs are disable. No pull-up or pull-down is activated. There is also no communication on I2C with MCU (there is no MCU connected)

    USB-C is disconnected then I suppose there is no incoming USB PD message or change in CC status. 

    I have EV2400. Can I use it to check Voltage alert and Fault alert? 
    Thank you

  • 0 in reply to Jozef Augustín
    Prodigy 60 points

    I tried to read SLEEP_CONFIG Register with external MCU and SleepModeAllowed bit is asserted.

    So, device should enter sleep mode. 

    MODE Register return APP - The PD Controller is fully functioning in the application firmware

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Hi

    There have been no activity for 5 days. Can you help me with this problem? 

    I've made a modification on EVM. I removed resistor R13 and I connected pin number 3 of U3 to GPIO0 on TPS with tiny wire.
    I also set plug_event on this GPIO. 

    Now I have a battery consumption of around a few tens of microampers. But device can work only in sink mode. The source mode is not working. Before with the same eeprom content it was working. 

    Jozef

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    Hi Jozef,

    I believe I have found the source of the issue. Can you please send me your device configuration file from the GUI (JSON format)?

    Regards,

    Conner

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Here is it. 

    {
  "questionnaire": {
    "device": "TPS25750",
    "answers": [
      null,
      0,
      4,
      4,
      0,
      0,
      3,
      0,
      1,
      1,
      0,
      12.6,
      1,
      0.04,
      0.04
    ],
    "vendorId": "0000",
    "productId": "0000",
    "version": "1.0.0.2"
  },
  "configuration": {
    "data": {
      "selected_ace": [
        {
          "register": 6,
          "data": [
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ]
        },
        {
          "register": 22,
          "data": [
            10,
            48,
            48,
            77,
            0,
            0,
            0,
            0,
            0,
            0,
            3
          ]
        },
        {
          "register": 50,
          "data": [
            4,
            168,
            42,
            44,
            145,
            1,
            38,
            44,
            209,
            2,
            0,
            44,
            177,
            4,
            0,
            244,
            65,
            6,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ]
        },
        {
          "register": 51,
          "data": [
            4,
            44,
            145,
            1,
            16,
            44,
            209,
            2,
            0,
            44,
            177,
            4,
            0,
            244,
            65,
            6,
            0,
            69,
            65,
            6,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ]
        },
        {
          "register": 92,
          "data": [
            48,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            48,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ]
        },
        {
          "register": 117,
          "data": [
            0,
            0,
            0,
            0
          ]
        }
      ]
    }
  }
}

    Jozef.

  • +1 in reply to Jozef Augustín
    TI__Genius 11630 points

    Hi Jozef,

    There was a hidden register preventing the device entering sleep mode. I have created a project binary with the settings you provided me that corrects this register setting. For our next Application Tool release, I will include this fix.

    Flashing the attached binary should allow you to enter sleep mode.

    Kind regards,

    Conner Gillettejozef_sleep.bin

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Hi Conner Gillette

    I'm now out of office, but I'll try it as soon as I return. 


    I don't have any device to write binary in to my EEPROM. Could you please provide me C file? 
    Thank you.

    Jozef

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    Hi Jozef,

    Here is the C file you requested.

    Regards,

    Connerjozef-sleep.c

  • 0 in reply to Conner Gillette
    Prodigy 60 points

    Hi Conner Gillette

    Thank you very much. Now your development board has consumption only 0.617mA. 
    I've made measurements on 5V input 1uA and on 3v3 input 40uA. The rest of the current (550uA) is probably caused by BQ25798.  

    Can I set in the Application Tool battery charger to Battery only mode with disabled ADC? Because it seems the charger's ADC is enabled. 

    You've released a new version of Application Tool and I've tried it but sleep mode doesn't work. I can achieve 0.617mA only with your configuration file. When will you include it?

    Thank you

    Jozef Augustin

  • 0 in reply to Jozef Augustín
    TI__Genius 11630 points

    Hi Jozef,

    I will consult with the team working on this and provide you an estimated time frame for this to be updated.

    Regards,

    Conner

  • 0 in reply to Conner Gillette
    TI__Genius 11630 points

    I think I misunderstood your request. There will be no changes to the Application Customization tool for the TPS25750 in regards to changing BQ device registers. The only change that will be made is to the hidden register in the TPS25750. That will be completed in the next month.

    Regards,

    Conner