USB Power Output - Mazda CX3 Forum
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post #1 of 14 Old 08-18-2016, 09:41 AM Thread Starter
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USB Power Output

These pics show the output voltage and current that is put out by the USB and Power Outlet (cig lighter). For those not familiar with the iPhone and iPad power requirements.

iPhone requires an output current of 1.1Amp @ 5Volts
iPad 2.1Amp @ 5Volts

This is the current required charging the devices when flat.

The maximum current that can be obtained from the USB outlets is 0.5Amp

The maximum current that can be obtained from the power outlet is dependent on what charger unit that's plugged into the power outlet.

Note: One pic deleted so number count (on pics) is missing one.
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post #2 of 14 Old 08-18-2016, 12:02 PM
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Thanks for confirming this, I figured the USB slots must have been 500mA. I bought a car charger that can output 2.4A since I needed a high current for my HTC 10. The USB port wasn't good enough and even those 1A chargers were slow.

This is the one I got: https://www.amazon.com/Chargers-RAVP...ds=car+charger

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post #3 of 14 Old 08-18-2016, 12:22 PM
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Yeah, they're USB 2.0 slots, if I'm not mistaken. I seem to remember reading at work that 500 mA is the limit in that specification and the USB standards body didn't increase that limit until USB 3.0 or 3.1. Why they didn't put USB 3.0 in there, I don't understand. Especially since it's the standard these days and it doesn't really cost anything extra in most retail products I've seen lately in the PC parts market anyway.

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post #4 of 14 Old 08-18-2016, 12:35 PM
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The USB spec is 500 mAh but there aren't any laws requiring mfr's to adhere to the spec. Different manufacturers have different ways of informing the device how much current can be delivered. Apple does it by providing different voltages across the data pins.
Reverse engineering Apple?s recharging scheme | Hackaday

A lot of it will depend on how the Mazda USB ports present themselves. The easy way out if you don't need data input across the wire is to just get one of those low-profile high-current accessory adapters.


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post #5 of 14 Old 08-19-2016, 11:49 AM
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Quote:
Originally Posted by Levi3xt View Post
...The maximum current that can be obtained from the power outlet is dependent on what charger unit that's plugged into the power outlet...
Up to a maximum of 10A

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post #6 of 14 Old 08-19-2016, 01:14 PM
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And that's at 12V (120W). 120W at 5V is 24A. Even if the charger is only 75% efficient, that's still 18A. That's a lot of phones to charge.
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post #7 of 14 Old 08-21-2016, 07:19 AM Thread Starter
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Originally Posted by NotAPreppie View Post
And that's at 12V (120W). 120W at 5V is 24A. Even if the charger is only 75% efficient, that's still 18A. That's a lot of phones to charge.
All well and good stating at 12V you have 120W (10A) and at 5V 120W (24A). However, you won't get 24A as the outlet and wiring are not able to handle 24A. Let's say Mazda allow a 50% in wiring capacity (I would bet it's more like 20%...if that) that would only allow 15A.

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post #8 of 14 Old 08-08-2017, 04:59 PM
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Originally Posted by Levi3xt View Post
All well and good stating at 12V you have 120W (10A) and at 5V 120W (24A). However, you won't get 24A as the outlet and wiring are not able to handle 24A. Let's say Mazda allow a 50% in wiring capacity (I would bet it's more like 20%...if that) that would only allow 15A.
Is there any product like that:
XD# Mini Dual 2 Ports USB Car Charger Adaptor Cigar Cigarette Adapter for iPhone | eBay

Which supports 2.1A USB port?
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post #9 of 14 Old 08-21-2017, 04:52 AM
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I brought a USB hub that i can power by using both ports this hub has 3 ports and charges my samsung s8+ whilst using android auto and works great.
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post #10 of 14 Old 08-22-2017, 04:17 AM
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Originally Posted by cartoonfanboy View Post
I brought a USB hub that i can power by using both ports this hub has 3 ports and charges my samsung s8+ whilst using android auto and works great.
Link to eBay/Amazon/Ali Express?
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