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Original question:

TUSB1046EVM: TUSB1046EVM Input using DP ALT mode, output using typec monitor，use i2c debug

TPS65987D: How to evauate several sink PDOs up to 60W?

Eduard Schnizer
Prodigy 30 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TUSB564Q1-EVM, , TUSB564, TPS65987

Tool/software:

Hello,

We are evaluating the TUSB564Q1-EVM based on both TPS65987D and TUSB564 for our "Type-C Display" application. Using both HP ProBook 450 G9 and HP Thunderbolt Dock 120 W G4 (only the right Type-C receptacle) we've already got an UHD image on the DP output. However, both HP sources only provide VBUS of 5V, even though we use the original PJT file requesting both Fixed Sink 5V and Variable Sink 5V to 20V.

Is that the right way to evaluate all the sink PDOs like 9V/3A, 12V/3A, 15V,3A and 20W/3A?

Thanks

  • 0
    TI__Mastermind 37855 points

    Hi Eduard,

    Just an FYI, but the TPS65987 is NRND. 

    Eduard Schnizer said:
    Is that the right way to evaluate all the sink PDOs like 9V/3A, 12V/3A, 15V,3A and 20W/3A?

     You may want to see if you have a type-c phone wall charger or something similar, as the multiport ones often can support up to 100-W.

    Eduard Schnizer said:
    even though we use the original PJT file requesting both Fixed Sink 5V and Variable Sink 5V to 20V.

    This should be fine. The variable sink PDO should support 5, 9, 15, and 20-V fixed PDOs.

    Do you have a PD analyzer, or a way to access the I2C ports of the TPS65987? There is a chance that the ports are not negotiating USB-C PD, and you only see a 5-V type-C contract. The analyzer will let us decode the CC communication to determine if a PD contract is even being attempted. If you have access to the I2Cs ports of the TPS65987, we may be able to get similar information reading from registers.

    If you connect a different type-C source, do you ever see >5-V on VBUS?

    Can you share the pjt file you are using with the TPS65987.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 30 points

    Hi Christopher,

    Yes, we know about NRND, but we have already produced first fewe samples and want to finish that design.

    No, we haven't any PD analyzers, but we are using the Aardvark and can debug the TPS65987. How can I see what source PDOs were offered?

    Using both HP ProBook 450 G9 and HP Thunderbolt Dock 120 W G4 we always measured 5V on VBUS. However we have already damaged two pieces of TUSB564Q1-EVM by connecting them to 1001-0095 | Ansmann HC245PD 2-Kanal Steckernetzteil AC/DC-Adapter 45W, 110 → 240V ac, 5 → 20 V dc / 2.4 → 3A | RS or to BPCPRO-X51 - Fortec US.

    Can you reccomend a signal source providing both DP ALT and PD 5V/3A 9V/3A, 12V/3A, 15V,3A and 20W/3A?

    Alternatively, we'd like to use a PD source only, you have already approved. Can you reccomend ones?

    Thanks

    Eduard

  • +1 in reply to Eduard Schnizer
    TI__Mastermind 37855 points

    Hi Eduard, 

    Eduard Schnizer said:
    No, we haven't any PD analyzers, but we are using the Aardvark and can debug the TPS65987. How can I see what source PDOs were offered?

    If you can read registers from the TPS65987, I would recommend reading the Status(0x1A) and RX Source capabilities(0x30) registers while the dock is connected. The Status register will indicate if a PD contract has been negotiated in the "Acting as Legacy" register. If a PD contract has been negotiated, the source capabilities register should get updated with the Dock advertised PDOs.

    Eduard Schnizer said:
    However we have already damaged two pieces of TUSB564Q1-EVM by connecting them to 1001-0095 | Ansmann HC245PD 2-Kanal Steckernetzteil AC/DC-Adapter 45W, 110 → 240V ac, 5 → 20 V dc / 2.4 → 3A | RS or to BPCPRO-X51 - Fortec US.

    I'm not sure why or how you have damaged the EVMs, but will focus on the HP docks for now.

    Eduard Schnizer said:
    Can you reccomend a signal source providing both DP ALT and PD 5V/3A 9V/3A, 12V/3A, 15V,3A and 20W/3A?

    What do you mean by a "signal source"? If you are talking about something to test with, you may be able to test using a laptop that supports DP alt mode. I don't have any specific suggestions though.

    Eduard Schnizer said:
    Alternatively, we'd like to use a PD source only, you have already approved. Can you reccomend ones?

    We do not currently have an active PD ics for source only. There are some planned in the coming years, but no recommendations at the moment.

    Thanks and Regards,

    Chris