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TPS25750: About ADCIN1 and ADCIN2 pins suitable settings

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Guru 21045 points

Part Number: TPS25750

Hi Team,

 

Our customer are evaluating TPS25750DRJKR at the following conditions.

Then, we have tree questions.

 

<Conditions>

-DRP (Source:12V/1.67A、9V/2.2A、5V/3A and Sink:8.4V/1.3A)

-Application have 2cell battery with BQ25792RQMR

-Configuration by external MCU (not EEPROM)

-ADCIN1 and ADCIN2 pins are GND

 

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[Q1]

If configuration by external MCU (not EEPROM), could you please let us know the suitable setting of ADCIN1 and ADCIN2 pins?

 

Currently, TPS25750DRJKR is working fine.

However, we found other E2E thread.

According to this thread, “In order to enter AlwaysEnableSink mode, you will need to change the voltage divider on the PCB  to set the ADCIN1 and ADCIN2 voltage to 1.5V.”

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1022414/usb-pd-chg-evm-01-can-t-work-well

 

We understand that if ADCIN1 and ADCIN2=GND(Current our setting), TPS25750DRJKR is SafeMode.

Is there anything wrong with the different settings?

--------

 

[Q2]

If your recommended setting are ADCIN1 and ADCIN2=1.5V,

We will connect ADCIN1 and ADCIN2 to 1V5_LDO pin of TPS25750DRJKR.

Is my understanding correct?

 

Other E2E thread

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1018307/tps25750-question-about-i2c-address-setting

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[Q3]

I'm starting "configuration with the following steps.

However, in rare cases, TPS25750DRJKR cannot be started properly(I2C can’t communicate).

Step1: Power supply from Battery to TPS25750DRJKR

Step2: VBUS is connected to TPS25750DRJKR

Step3: Configuration from external MCU

 

Bye the way, if we tried the following steps, I2C can communicate always.

-Step1-> Step3-> Step2

-Step2-> Step1-> Step3

 

Could you please let us know this cause if you have any information?

I'm worried if ADCIN1 and ADCIN2 pin settings aren’t affecting TPS25750DRJKR.

--------

 

Regards,

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  • +1
    TI__Mastermind 35061 points

    Hide,

    A1, A2:  The purpose of Safemode is to allow the TPS25750 to accept power from the VBUS and load it's configuration from the EEPROM without connecting the PPHV bus.  This allows the device to be configured before any power is applied to the system.  For AlwaysEnableSink mode, the TPS25750 will power up and connect the high voltage path.  This allows an internal power tree to power up an MCU to configure the TPS25750 for cases without EEPROMS which matches you configuration.

    A3:  The TPS25750 will not respond to many I2C commands until after step 3 has completed, so it is much better to configure the device before issuing any non-boot related commands.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Guru 21045 points

    Hi Chuck-san,

     

    Thank you for the information.

    I understand that if not EEPROM(use external MCU), your recommended setting is AlwaysEnableSink.

     

    Regards,

    Hide