USB Type C and USB Power Delivery in the automotive sector

 

What is USB Type C?

USB-C, also known as USB Type C, is the latest connector developed by the USB Implementers ’Forum (USB-IF) - a group of leading electronics companies such as Apple, Intel, Dell and Belkin. Since many of the world's best known manufacturers support this new technology, it is already being used everywhere. Thanks to this support, USB-C will gradually replace the previous USB types, i.e. USB-A, USB-B and USB Mini-B.

 

 

 

 

The most important properties of USB Type C at a glance

  • Brand new reversible plug with a height of only 2.4mm
  • Compatible with USB Power Delivery 2.0 with up to 100 W.
  • Double the bandwidth of USB 3.0 and increase it to 10 Gbit / s with SuperSpeed ​​+ USB3.1
  • Combines multiple protocols into a single cable, including DisplayPort ™, PCIe®, or Thunderbolt ™

 

 

What is Power Delivery?

USB Power Delivery is a specification of USB that enables devices to be supplied with up to 100 watts. For the first time, the voltage can be regulated with Power Delivery.

 

 

 

 

USB Type C and USB Power Delivery in the automotive sector

As more consumer devices (such as phones, tablets, and laptops) support USB-C and Power Delivery, the need for USB-C and Power Delivery ports in cars increases. Consumers can quickly charge all of their devices (including laptops and tablets) via USB-C and enable new features like intelligent mirroring for entertainment in the back seats.

 

Automotive-USB-C-Anwendungen

 

 

USB Type C Automotive Controller

Due to the high requirements, USB Type C controllers in the automotive sector have to have numerous properties, such as programmable, highly integrated Type C and PD properties for intelligent, in-vehicle charger connections (head units, rear seat chargers and rear seat entertainment). An example of this is the product family of EZ-PD CCGx controllers from Cypress Semiconductor, which provide a multitude of functions and properties that are necessary in the automotive sector.

 

 

Features of USB Type C controllers

  • Dynamic load balancing between the individual connections
  • Support of the USB Power Delivery 3.0 standard with PPS and older protocols (BC 1.2, QC 2.0 / 3.0 / 4.0 +, Apple Charging, Samsung AFC)
  • One-chip solution for systems with USB-C + USB-A (with CCG3PA Automotive)
  • Intelligent communication with media hubs in the infotainment unit
  • Support of "Alternate Mode" (DisplayPort standard) in rear seat entertainment systems
  • Cable length compensation for designs with connection cables
  • Intelligent power management with temperature-dependent and VIN-based power throttling
  • Possibility of user-defined adaptation (connection priority, LED displays, etc.) through programming
  • Flash memory updated to the latest USB power delivery standards

 

 

 

What is the problem with USB Type C?

Due to the fact that the possible power output is considerably higher than with previous USB specifications, there are many advantages that speak for the implementation of USB-PD, but also one primary disadvantage: security.

Since USB-PD (Power Delivery) enables a much greater power output than conventional USB charging standards, even small percentage deviations from the specification for cables or power supply units lead to problems, damage or, in the worst case, to injuries. There have been numerous reports of burned-out or burned-out Type C charging sockets caused by untested no-name power supply units or cables whose resistances were incorrectly dimensioned and thus gave too much power.

 

 

Tools for testing USB Power Delivery

With the right tools, comprehensive tests for compliance with the specification can be carried out and valuable time can be saved in the development of USB-PD systems.

 

PD_Analyzer

 

USB Power Delivery Protocol Analysis

By combining the USB Power Delivery Analyzer with the free Data Center ™ software, you can log, monitor and decode the power supply on the CC1 / CC2 pins (configuration channel), while at the same time the USB 2.0 and USB 3.1 (up to Gen2) Data line is used.

PD_Tester

 

Test of the power supply capability of the USB host

Make sure the voltage readings stay within specification under heavy load. The Power Delivery Tester PM125 checks whether a USB host is able to deliver the specified maximum power without errors. The PM125 model supports PPS and the Quickcharge specifications.

PD_loopback_and_scurcuit_tester

 

Data integrity test and short circuit tests

With the USB 3.0 / 2.0 loopback connector you can measure the transmission speed and the voltage level. In connection with the PM125, the specified current, voltage drop and data integrity can be tested on a USB Type-C cable. The USB SOS device helps to identify faulty connections.