USB Power Delivery v2.0 Specification Finalized - USB Gains Alternate Modes
by Brett Howse on September 17, 2014 8:00 AM EST
The last while has been a busy time for the USB 3.0 Promoters Group, with the new USB 3.1 Type-C Connector detailed last month. Joshua was able to get a hands on with the new connector at IDF last week. With support for up to 10 Gbps, a new reversible Type-C connector, and up to 100 watts of power delivery, the USB group is trying to expand the already universal connector to be able to do much more than is possible with the current specification. To fulfill this mandate, they have now finalized the USB Power Delivery v2.0 spec, and the Billboard Device Class v1.0 spec.
When USB was first introduced, the thought was that it would be primarily a data interface, with a limited amount of power delivery which was generally used to power the electronics of certain devices. The initial specification for USB only had provisions for 0.75 watts of power – 150 mA at 5 V. USB 2.0 bumped that to 500 mA, or 2.5 watts, and USB 3.0 specified 900 mA at 5 V, or 4.5 watts. All of these specifications allow for power as well as data transmission at the same time. In addition, there was also a Battery Charging specification which allows up to 1.5 A at 5 V for a maximum of 7.5 watts of power but with no data transmission available. The jump from 7.5 watts to 100 watts of the new specification is a huge increase, and one that cannot be done with just an amperage increase on the system as was done in the previous versions of USB. Version 3.1 now supports 5 V, 12 V, and 20 V on the pins to allow the higher power output without excessive current, but even the current has been increased to a maximum of 5 A which is much higher than before.
The inelegant USB 3.0 Micro-B connector
USB Power Delivery is designed to increase the flexibility of USB, by providing enough power for many more devices, while at the same time still allowing data delivery. It is also even more flexible, due to a couple of changes. First, the direction of power delivery is no longer fixed. Imagine a tablet with a keyboard attached. The keyboard can have a battery, and the battery can be charged through the data connection, but when the tablet is unplugged from its charger, the power flow can reverse and the tablet can now be powered by the keyboard. Another example is a laptop with six USB ports. The USB ports can be used for peripherals, or, a USB charger can be connected to any port to charge the laptop. Dedicated charging connectors will no longer be required.
The reversible USB 3.1 Type-C connector
Another change is that all devices must now negotiate the amount of power required, and that can be renegotiated if another devices requires additional power. A good scenario would be if you have a laptop, and you are charging your phone on one of the USB ports. The phone would be pulling the maximum amount of power it can in order to charge quickly. If you then plug in a USB RAID array, it will need additional power at the start in order to get all of the disks spinning, but then can be lowered to a steady state. The system can lower the power delivery to the phone, provide it to the RAID array, and then move it back to the phone when the power is available.
The final key is that the Power Delivery specification is not just for power, nor is it just for USB. The Power Delivery Specification allows Alternate Modes to be defined, and the system can negotiate to enable these modes, enter them, and exit them. These modes will be defined outside the scope of USB-IF specifications using Structured Vendor Defined Messages. This allows the ability to reconfigure some of the pins a USB Type-C connector exposes and will allow the cable to be used for many different purposes rather than just for USB.
This leads us to the second specification – the Billboard Device Class. This specification outlines the methods used to communicate the Alternate Modes supported by the Device Container to a host system. It includes descriptors which can be used to provide support details in a human-readable format. What it does not contain is the methodology to switch to the Alternate Mode – that is done in the Power Delivery specification itself. The Billboard Device Class will allow a device which supports an Alternate Mode to connect to a host which does not support that mode, and then inform the user why it does not work without having silent failures, and for this reason all Billboard Devices must support USB 2.0 as a minimum.
This new framework could open the ubiquitous USB cable up to an entirely new array of devices and functions. One possibility that the USB-IF mentions in the specification is a theoretical means for PCI-E over USB. I’ve already given the example of a tablet with a battery in the keyboard, but a laptop could be connected to a monitor which can also charge the laptop. Much more power hungry devices can be connected to a USB port as well, including printers and high speed storage. All of this was defined with a graceful fail as well, so the user is not stuck wondering why his device is not functioning any longer.
The new Alternate Modes have quite a potential, and with the increased power capabilities of USB 3.1 and the Power Delivery Specification, it will be very interesting to see how these capabilities are taken advantage of in future devices.
Source: USB-IF
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phoenix_rizzen - Wednesday, September 17, 2014 - link
A separate powered USB hub would be better. Single big power brick to hide under the desk, and then you power everything from there: monitor, laptop, phone, tablet, harddrives, etc. And plug all your peripherals into there: keyboard, mouse, etc.Then you only have to worry about a single connector going into the laptop/desktop/whatever.
I can see this causing a resurgence in "docks" for laptops, using USB as the "dock connector".
mkozakewich - Wednesday, September 17, 2014 - link
There is no reason to run a desktop monitor from your laptop. If you've got a big beast of a screen, it's highly likely you'll be stationary right next to a plug. It's the reverse that's true; the monitor can power the laptop.The rest of what you said holds true regardless. Monitors have adapters to supply whatever they need, and they need to watch their heat generation. Cheaper monitors wouldn't be able to supply a free 100 W to laptops, although laptops can usually negotiate a lower rate and just charge slower. You could also put it on sleep.
If you had a portable monitor, it would be like an ARM tablet without the ARM, and it would probably only take 4 W or so. USB 3.0 could power that, if not supply the data. USB 3.1 could handle any mobile monitor you throw at it.
(Now why aren't we seeing more of these? Or tablets with video in that can become a monitor? When the iPad 3 came out, I would have bought one JUST to use as a monitor, if it could support that.)
Murloc - Thursday, September 18, 2014 - link
laptops usually have a monitor already so there's no need to use a tablet as an alternative monitor, except for rare exceptions where you need computational power but you don't need the keyboard and you have touch-friendly software on your laptop.markass530 - Monday, September 22, 2014 - link
No reason other than to have 2 monitors, as part of a docking station set up, just to not have to squint at a small ass laptop screen when you're at home, pretty sure I could come up with 20 other reasons.. so yea your special needs effort of "No reasons" needs some revising, and maybe a little bit of thought and effortt.3DoubleD - Wednesday, September 17, 2014 - link
I'm so glad I didn't invest a penny into USB3.0. These type-C 3.1 connectors are clearly where it is at - reversible plug, ultrafast, and with flexible, high power-capable delivery. I'm pretty excited for these to be ubiquitous!fokka - Wednesday, September 17, 2014 - link
usb3 is great too, but sure, 3.1 brings usb to a whole new level. can't wait for the market to make the switch.Deelron - Wednesday, September 17, 2014 - link
Oh it's been worth the couple of dollars more to get the faster transfers (as a late adopter).Impulses - Thursday, September 18, 2014 - link
Only really used USB 3.0 myself for backup HDDs, but it was definitely WELL worth it for that. I did buy a USB 3.0 extension to charge my OG Transformer (propriety connector on one end, 3.0 pin out on the USB/AC end).MrSpadge - Wednesday, September 17, 2014 - link
This flexibility may enable truely great new usage cases and could simplify quite a lot of things. However, "These modes will be defined ... using Structured Vendor Defined Messages" looks like lot's of compatibility problems may be incoming.AppleCrappleHater2 - Wednesday, September 17, 2014 - link
As a non-apple-fanboy, I do have to say that the lightning connector used on iPhones is a smarter connector. If it's going to break due to external force influences, it'll break the tongue off the plug, rather than damaging the socket, subsequently a lot cheaper and easier to fix. Replacing broken microUSB ( and soon Type-C ) sockets on phones, tablets and similar devices is rarely cheap and frequently has additional complications ( such as lifting tracks, broken PCBs or just nearly impossible to find a suitable replacement connector ).It's a lot simpler extracting a broken off tongue from a lightning socket and getting a new cable.