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TPS65987DDJ: What is the difference between TPS65987D and TPS65987DDJ chips?

user5707026
Genius 3145 points
Part Number: TPS65987DDJ
Other Parts Discussed in Thread: TPS65987D, BQ25703A

Dears

What is the difference between TPS65987D and TPS65987DDJ chips?
Regarding TYPE-C PD function control, currently using the TPS65987DDJ chip, can the PD mode charging control be achieved without the participation of an external HOST? TPS65987DDJ chip, how does the external host control the chip's operation through the I2C interface? I did not find documents such as control instructions or internal register descriptions on the Internet. Is there a document?
Is the external SPI interface FLASH necessary? Without FLASH, can it be started normally only with its default BOOT mode?

Please reply urgent.

Thanks

Elsa Duan

  • 0
    TI__Mastermind 30000 points

    Hello Elsa,


    The internal ROM is different between the TPS65987D and the TPS65987DDJ as they are intended for different applications. The TPS65987DDJ is intended for Thunderbolt platforms while the TPS65987D is intended for all other platforms.

    If your system is a Thunderbolt platform, use the TPS65987DDJ and request access to all of the collateral needed for this device (on product page). If your system is not a Thunderbolt platform, then switch to the TPS65987D and you can find all your necessary documentation online

  • 0 in reply to Adam Mc Gaffin
    Genius 3145 points

    Hi Adam

    It's urgent case.

    Can you confirm that if you use TPS65987D without using external SPI FLASH and without using an external processor, can you achieve a pure PD charging method with the BQ25073A chip in the back end?

    The schematic diagram of the circuit design is shown in the figure:

    PD_EVM_1_sch_2020-8-13.pdf
    In actual use, no FLASH chip with SPI interface is soldered.
    I have tried that VIN_3V3 is provided by an external power supply and LDO_3V3 is generated internally.
    The battery is connected in series with two lithium batteries, the designed charge termination voltage is 8.4V, and the actual tested battery voltage is 7.6V.
    Design goal: Use the simplest way (preferably not to use external FLASH and external host) to realize PD mode battery charging and discharging, and the charging power is between 30w and 60w.

    Thanks

    Elsa Duan

  • 0 in reply to user5707026
    TI__Mastermind 30000 points

    I can't speak on the design that you shared, but if you want to have the TPS65987D control an external battery charger such as the BQ25703A, you must use a customer configuration which requires the use of the application configuration tool and an external flash