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QF TK might exceed the USB standard in Current requirements..

post #1 of 5
Thread Starter 
I noticed that the keyboard might exceed the limitations of the USB standard for 500mA current for devices that are not chargers.

I looked at some numbers for leds and it appears in some cases X100 of them might reach 2 A and exceed it.

Good evidence appears to be the FAQ for CM Trigger which explicitly states that that keyboard cannot sustain the highest level of backlit power and it must use an external 5V adaptor to go higher, But the TK has no FAQ at all.

I suspect they violate the standard and that may make the device to misbehave especially in laptops.

It's likely that while the standard allows 500mA they go routinely at up to 2.5A which means they don't just reach the limit of the standard but the limit of the hub itself.

I noticed a powered hub here provides only up to 2.5A, for reference.
Edited by fateswarm - 5/29/13 at 11:31pm
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post #2 of 5
All very true.
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post #3 of 5
Thread Starter 
It's likely that they care little since desktops are often powerful enough to carry a 'christmas tree' such as this but it may be a problem in laptops that usually ARE designed at those around 2.5A limits per whole hub (each device shouldn't draw more than 500mA, let alone more than 2000, and they ALREADY usually have internal devices connected to the hubs).

i.e. carry an (externally powered) hub around if you suspect power issues just to make sure.
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post #4 of 5
Will turning of the back-lighting solve the problem?
post #5 of 5
Thread Starter 
Quote:
Originally Posted by xeekei View Post

Will turning of the back-lighting solve the problem?
It's not exactly clear what's going on since the keyboard might hang for a few minutes - and then return to life - even when most of the leds are off.

So I had suspected the laptop giving it unstable voltage but that was in turn very unlikely since tons of other peripherals work perfectly.

The only other time I noticed a problem was when I had a simultaneous connection of many devices and then a disk going down.

But this had it even when being connected alone. It appears a powered hub stabilizes it enormously.
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