Is there a way to differentiate between the STUSB4500 and STUSB4500L via I2C?

[Mmade.11]

The STUSB4500 and STUSB4500L are similar in nature, however the NVM config for the STUSB4500 is not compatible with the STUSB4500L. Is there a way to identify the part number via the I2C bus? The Device ID Register returns 0x9C for both the STUSB4500 and the STUSB4500L.

[MIMBE]

Hello Mmade.1,

I finally got the answer from the apps dev dept.:

" No, that makes sense what he is seeing…the STUSB4500L is locked and not programmable…it supports the USB-C power profile only, up to 5V at 3A = 15W. If the customer needs to support higher power, then they need to use the STUSB4500. The parts are die-identical, but we de-featured the STUSB4500L for sub-15W applications only, and give it a lower cost. I guess that explains why it removed the NVM section once it recognized the chip as the L version."

And actually, on my computer, STSW-STUSB002 V1.11 showed the "Sink parameters" (exactly as the screen shot you sent me) until it recognized the L version: then this page disappeared, as L version is 5V/3A capable only.

Not very useful, IMO. Unless you're designing a USB-C to USB-A adapter...

Hope this helps.

Cheers.

Matt

[Winfred LU]

> however the NVM config for the STUSB4500 is not compatible with the STUSB4500L.

I don't quite understand the point.

In most cases, there is no need to program STUSB4500L, so that I2C is not needed.

> Is there a way to identify the part number via the I2C bus

Try to read register at offset 0x70, if the value is equal to 0, it means the device is STUSB4500L.