TPD4S012: schmatic review

Hi Sky, 

I am a bit confused on why the RCLAMP is being used before the TPD4S012. They are both protection devices. If you need to protect more channels, then we can find a device that has that option for you. 

Best,

McKenzie

Hi Sky, 

Would you be able to share more of the schematic so I can see what the RCLAMP device is connecting to? Being able to see the bigger picture will help determine the best recommendation. 

Best,

McKenzie

Hi Sky, 

So based on what I am seeing, it looks like the RCLAMP device and the TPD4S012 device are in parallel. That isn't ideal and will add more capacitance into your system. There are a few options:

1. Remove RCLAMP device, then GND the ID pin on the TPD4S012 device so the pin is not floating. 

2. Remove RCLAMP and TPD4S012, then have one device for VBUS protection and one device for D+/D- (I can give you TI recommendations if needed).

Are there any specific requirements needed for protecting the MCU?

Best,

McKenzie

Hi Sky, 

Yes, I would recommend ESD441 for VBUS and ESD122 for the D+/- lines. Here's a good application note on USB ESD protection: link. 

Best,

McKenzie