Enhanced mini-USB

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Enhanced mini-USB" – news · newspapers · books · scholar · JSTOR (September 2009) (Learn how and when to remove this template message)

An enhanced mini-USB (EMU)

switch.

In the CEA-936-A standard, there are no extra pins — the USB data pins are also used for RS-232 transmit and receive, stereo audio left and right, or for microphone and speaker/earpiece. Devices select which function the pins perform depending on user settings or on the context or mode in which the device is being operated. Two different functions cannot be used at once.

Using the connector may require a breakout cable or special headset. Most often, the user must buy a special adapter or

for a monophonic headset or 3.5 mm for stereo headphones. True breakout cables which provide all connections are unavailable, thus a phone cannot be charged at the same time as a headset or headphones are inserted, even for EMUs with extra pins.

Some mobile phone companies have used the extra pin "X" to enforce the use of their own battery chargers.

or not connected at all. Without this connection, the phone will refuse to charge, displaying "unauthorized charger" despite receiving the proper current. The phone will charge while connected to a personal computer only if the PC is running a special device driver.

Extra pins in hybrid mini-USB connectors are used as non-standard compliant way to provide USB 3.0 SuperSpeed connectivity as alternative to standard SuperSpeed micro-B and USB-C connectors.^[3]

References

External links

• "EMU". OpenEZX. 2013-05-01. Archived from the original on 2013-05-01. Retrieved 2019-03-21.