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SD-to-USB Adapter?

Jake Page Icon Posted 2016-08-29 2:00 PM
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I'm either googling it wrong or it doesn't exist: is there an usb adapter that fits an sd card slot? Meaning that you insert card into sd slot and on the adapter's other side is a usb port. Or is that apples and oranges?

Jake

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C:Amie Page Icon Posted 2016-08-29 6:20 PM
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I think a key issue is voltage. USB is 5v and SD is 3.3v at its absolute highest, lower for newer interfaces. It would need to be externally powered.

CF is 5v, hence it's possible there.
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Rich Hawley Page Icon Posted 2016-08-30 2:37 AM
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You mean like this?




(ImageCorp_20160829203602.jpg)



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CE Geek Page Icon Posted 2016-08-30 8:20 AM
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Quote
C:Amie - 2016-08-29 10:20 AM

CF is 5v, hence it's possible there.


Thus the Ratoc and Solar Express cards.
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Jake Page Icon Posted 2016-08-30 9:14 PM
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Many thanks, people, for the heads-up. Rich, I looked up the Mobiadapter. Not much written instruction, so it's hard to tell if it will only power usb sticks or something more complicated such as a usb modem.

I don't know how you found that thing. You tickle those google ivories better than I do.

Jake

Edited by Jake 2016-08-30 9:14 PM
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C:Amie Page Icon Posted 2016-08-31 8:21 PM
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http://www.anandtech.com/show/10163/usb-flash-drives-power-consumption-measurement-using-plugables-usbctkey
Coming back to our original intent of measuring the power consumed by USB peripherals such as flash drives, it is obvious that we need to be measuring the voltage and current on the VBUS line. This aspect has suddenly become something to care about because of the number of mobile devices supporting 'OTG'. Not all mobile devices are able to provide the 900 mA output current to 'bus-power' attached devices. Note that 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. Understanding the power consumption profile of a flash drive is essential to determine whether it can be safely used with a particular mobile device. It can also help in understanding the impact of usage on the battery life of a mobile device. From a technical viewpoint, it also gives insight into the efficiency of the USB peripheral itself.


If it runs at 3.3v, it'll chew your battery to bits

Pretty cool though
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