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TPS65987D: Customer's questions

Yoshinobu Kagawa
Expert 2040 points
Part Number: TPS65987D


There are four questions from customer.

1. When using TPS65987D, which is the direction of power supply / reception in the initial state?
Customer wants to keep receiving power in the initial state.

2. I would like to supply power to iPAD / iPhone / Android etc. from our product equipped with TPS65987D.Is it possible to set the power supply current by I2C from the CPU on our product to TPS65987D?
Specifically, I would like to specify 4 current values ​​of 5mA at 500mA / 900mA / 1.5A / 3A from CPU.
(I think how to specify the current from the CPU to TPS65987D by I2C etc.Is it possible to set it in units of 50 mA? )

3. If a current exceeding the value specified by the CPU above flows to the iPAD / iPhone / Android connected to TYPE-C, will the TPS65987D limit the current?
What is the current limit range?
(For example, if the TPS65987D is set to 500mA, will the power supply be stopped if a current exceeding 1.xx times that flows?)

4. Isn't TPS65987D an issue with debounce? (Are you able to handle it?)

Kagawa

  • 0
    TI__Mastermind 30000 points

    Hello,

    1. You can configure the TPS65987D to initiate the swap to sink so that it will always prefer to be a sink.

    2. Yes your customer can control the Type-C current advertisement to 500/900mA, 1.5A, and 3A using bits 0:1 of register 0x29

    3.  You can refer to section 3.2 of the following app note for the FW OCP for the internal power path

    https://www.ti.com/lit/an/slva994/slva994.pdf

    4. Would you be able to elaborate more on the de-bounce issue you are referring to?

  • 0 in reply to Adam Mc Gaffin
    Expert 2040 points

    Hello Adam-san,

    1. Is this "setting TPS65987D" the setting when fixing some PIN of TPS65987D to either H/L?
    (For example, in the setting of F/W, SYSTEM does not start unless power from USB is supplied via TPS65987D.)

    4. When a product using a PD controller IC and Apple's Charger are connected with a USB TYPE-C cable, the timing of detection debounce of CC does not go well, and there are cases where the power supply from the Charger does not go well. Customer heard when explaining other companie's PD controller IC.
    (The IC maker says that the latest PD controller IC adjusts the debounce detection timing so that the latest IC can receive and supply power well.)

    Regards,
    Kagawa

  • 0 in reply to Yoshinobu Kagawa
    TI__Mastermind 30000 points

    Hello,

    1. This is done through the configuration tool associated with the device following the link below. There are videos on this page as well to help you get started. In register 0x29, there are configurable bits where the TPS65987D can initiate a PD swap to sink

    http://www.ti.com/tool/TPS6598X-CONFIG

    4. I'm not sure the specific issue your customer is mentioning, but if the device being connected is a USB-IF Type-C PD compliant device, and your device is also compliant, there should be no issues connecting to one another. Also, if you wish to be charged from legacy chargers (BC1.2, Divider 1, etc...) then the TPS65987D also has the ability for legacy charger advertisement as well as detection. This is also configured within register 0x29