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September 10, 2019 08:23 pm

Myths About USB Type-C

Julie Stultz, Technical Marketing Manager at ON Semiconductor, writes for ElectronicDesign: 1. USB Type-C and PD are complicated: With a universal connector that can plug into a power host (source) or device (sink), it seems like the negotiation of which device is powering which can be overwhelming for product designers and consumers. However, products can have more -- or less -- complexity based on the product designer's needs. For Type-C only devices, a single IC can be used to control all of the connection handshakes. For more complex features, the Power Delivery protocol (PD) can be implemented. There's a strict set of guidelines that must be followed to be USB-C PD compliant. Products receive approval from the USB-IF governing committee before they're certified. Utilizing firmware from certified IC vendors can simplify design the solution.2. USB Type-C and PD is expensive: To detect, attach, and negotiate communication, it would seem that the transition from USB 2.0 to USB-C would become expensive. For basic USB-C functionality, a basic state-machine controller can be used. Controllers are available on the market for 3. All Type-C ports have identical functionality: Despite a common connector, the actual feature set of a USB-C port can vary significantly. Ports on travel adapters only charge devices. Ports on wearable devices typically only receive charge. Ports on dual-role devices such as laptops can still see variation in port features. Power levels for standard Type-C ports are limited to 15 W while ports that implement PD can negotiate power up to 100 W. In addition, some ports are capable of data communication up to USB SS Gen 2 speeds of 10 Gb/s. Other features may include DisplayPort or Thunderbolt support. The article debunks eight more myths.

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