EVAL- SCS001V1: Doubts regarding type of source, configuration and output.

[AshutoshK]

Hello There!

I have bought EVAL- SCS001V1 sink device for my application in which I need the output as 12V/2A from the mentioned sink device. I came across below problems and I seek help on it.

1) Problem related to STSW-STUSB002 GUI version 2.0.

The first problem is with the GUI version 2.0 as specified. When I made hardware connections as mentioned in the quick start document and I tried to connect the Nucleo- F072RB with the GUI 2.0, I got an error which says " The Parameter is Incorrect". and I'm unable to connect the hardware with the GUI 2.0.

I have resolved this issue by using the previous version ( STSW-STUSB002 GUI 1.09 ). So my hardware got detected in this version and I was able to program or write the NVM successfully. In the Connection Status of the GUI 1.09 it showed that " OK STUSB4500_L  Detected (COM19), at address 0x28 (I2C bus 1)" sharing image below.

2) Problem related to the usage of the source device and selecting desired PDO's.

Currently I'm using the 65W mobile phone charger as the source device. I was not aware of the charging technology it was using. I was not able to switch the PDO profiles at the output. I was getting constant output 5V whereas the required is 12V. So if I'm not wrong the source must be USB PD technology support.

I need help on the available sources which I can use. And how can I select the desired PDO from configured PDO's in NVM to get the desired output 12V/2Amps.

 

 

[NBALL]

Hello AshutoshK,

May I ask you to share a picture of the board you are using ?
As per the snapshot shared, it seems it is eval-scs002v1 and not eval-scs001v1.

As eval-scs002v1 is stusb4500L which is TypeC only: you will never be able to get more than 5V.
Best rgeards

Nathalie

[NBALL]

About the GUI issue, the whole package needs to be installed as some libraries have changed.
Best regards

Nathalie

[AshutoshK]

Could you please send me the latest working GUI I have with me 1.08, 1.09, 2.0. But 2.0 not working.

[AshutoshK]

Yes I have updated STlink FW when I was installing drivers at the start of my evaluation. Thanks for the same.

Also I have an update, my configuration worked and I got +12V at the output. In dashboard window its showing PDO3 is selected (Attaching screen shot for your reference). I have changed the source to PD compatible.

So basically what I have understood is the source which we are using must be compatible to sink i.e the source must have USB PD 2.0 if your sink is PD 2.0. I have also tried on source supporting latest PPS technology having the required output profiles but it didn't worked with eval-scs002v1. To work with the sink having PD 2.0 source must be PD supported. I have one doubt please enlighten me on this., In STUSB4500 datasheet it is given PD2.0 , PD3.0 compatible then why it didn't worked for PPS. As PPS is extension of the PD3.0 what I think it must work.

I have one observation regarding NVM PDO configuration. I have connected the load to the output of eval-scs001v1 which I measured and found 12V. In the Dashboard of GUI it is showing "Explicit Contract with PDO 3". But on PDO3 I have configured 15V profile and on PDO2 12V. What can be the possible cause that profile Explicitly selected is PDO3 but the output I'm getting at eval-scs001v1 is +12V, it must be +15V according to the selected PDO3.

[NBALL]

Hello

All PD3 sources support also PD2. Please note that 12V is not a mandatory voltage node. Only 5-9-15-20 are, depending on source power. So most probably, PD3 source which you are using does not provide 12V as fix PDO: that's why you cannot get 12V at stusb4500 output. (see 
STUSB4500 algo selects fix PDO based on source fix PDO offer.

As fix PDOs power rules and object are same in both PD2 and PD3, our sink works with both PD2 and PD3 sources.

stusb4500 is not able to get PPS voltage because PPS PDO is only a PD3 object.

The PDO number refers to the request sent by STUSB4500: it has requested 3rd source PDO which was, in this case, 12 volt.  15V will be 4th PDO of the source as they need to by ordered by increasing voltage. 9V is the second.

Best regards

Nathalie

 

[AshutoshK]

Hello Nathalie

Thankyou for the details, I'm getting 12V as a output at the output of the sink device. But there is one issue I'm getting, when I power ON the source at the very first time I can't able to get the 12V output at sink device output. The led on sink device blinks and it goes in off state. After sometime I need to power OFF the source and power ON it again then I get the output at the sink device as 12V. I dont know why this is happening please help on this.

 

Best Regards

[AshutoshK]

Hello Nathalie,

I am using the 35W source having profiles 5V, 9V, 12V, 15V and 20V. The problem is I'm not able to select the 15V and 20V profiles. It works fine while selecting 5V, 9V and 12V profiles. I'm not able to understand the reason I have tried various values of current and also tried lower and upper voltage tolerances.

Kindly help on this. 

[NBALL]

Hello

STUSB4500 has 3 PDOs.
I guess that when you want to select 15V and 20V, you have suppressed 9V and 12V.

As this is 35W source, I suppose that 20v is 1.75A and 15V is 2.33A.
Thus STUSB4500 PDOs need to be set accordingly.

Best regards

Nathalie

[AshutoshK]

Hello,

Yes, this is 35W source with 20v, 1.75A and 15V, 2.33A.

I have surpassed 9V and 12V profiles and in GUI I have set PDO's as given in image below.

I have tried 15V 0.5A, 15V,1A , 15V 1.5A, 15V 2A. But nothing worked. Tried entering current value lesser than source current for 15V and 20V it also doesn't worked.