TUSB320LAI: EN IEC62680 1-3 test support.

Jeffery Lam

Part Number: TUSB320LAI
Other Parts Discussed in Thread: TUSB320

Tool/software:

Hi,

Our product utilizes the TUSB320LAI CC controller to manage USB-C port behavior. In accordance with the EU Common Charger Directive, we are required to comply with EN IEC 62680-1-3.

Recently, we encountered several test failures during IEC compliance testing in SNK mode and would appreciate your support in identifying a solution.

The test failures are as follows:

TD 4.3.1 Sink Connect Source Test – The PUT does not assert Rd on the CC pin.
TD 4.3.2 Sink Connect DRP Test – The PUT, when acting as PUT_R, does not assert Rd on both CC pins.
TD 4.3.3 Sink Connect Try.SRC DRP Test – The PUT, as PUT_R, does not assert Rd on both CC pins.
TD 4.3.4 Sink Connect Try.SNK DRP Test – The PUT does not maintain Rd on both CC pins for the duration of the test.
TD 4.11.2 Sink Dead Battery Test – The PUT improperly asserts Rp, which is not allowed.

Below is the schematic snippet for the CC controller. Please note that the port’s default role is configured as DRP. However, for testing purposes, we set the port to UFP (unattached.SNK) via I²C. The I²C configuration values used are:

30 32 33 42 53 55 54 00 00 30 10

However, based on the test results, it appears that the port role was not successfully switched from DRP to SNK mode.

Regards,

Jeff

3 months ago

0 Ryan Kitto 3 months ago

TI__Mastermind 38955 points

Hi Jeff,

Could you try disabling UFP accessory support for me, and seeing if that improves any of the test results:

Additionally, when you are using I2C to set the TUSB320LAI to UFP/SNK, are you doing this while there is no connection?

If there is an attached connection, switching from DRP to UFP will have no affect. There needs to be no active connection when you set MODE_SELECT.

Thanks,

Ryan

0 Jeffery Lam 3 months ago in reply to Ryan Kitto

Prodigy 50 points

Hi,

1. Could you try disabling UFP accessory support for me, and seeing if that improves any of the test results:

Yes, we could try this.

2. Additionally, when you are using I2C to set the TUSB320LAI to UFP/SNK, are you doing this while there is no connection?

Yes, there is nothing connected to the port while we switch mode.

Regards,

Jeff

0 Ryan Kitto 3 months ago in reply to Jeffery Lam

TI__Mastermind 38955 points

Hi Jeff,

Sounds good. Just to confirm, the SDA/SCL lines are pulled up to either 1.8V or 3.3V with a 4.7KOhm resistor, correct?

Jeffery Lam said:
The I²C configuration values used are:

30 32 33 42 53 55 54 00 00 30 10

And I'm guessing this confirms that any writes you are making can be read back, correct?

You can also monitor whether the TUSB320 has been set to UFP or not by monitor the CC pins to ensure they are pulled-down. If they are toggling between high and low, then the TUSB320 is still set to DRP.

Thanks,

Ryan