Mobile high definition link
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Mobile High-Definition Link ( MHL ) is an interface for mobile devices with which high-resolution audio and video data can be transmitted from a mobile device ( mobile phone , tablet ) to a screen via a cable . The mobile device can be charged at the same time via the cable. MHL is an alternative to the HDMI standard. To support the MHL standard, the mobile device needs a corresponding socket. The USB socket cannot be used, even if there are MHL cables with a suitable connector.
Normalization
MHL was developed in 2009 by a consortium made up of Nokia , Samsung , Toshiba , Sony and Silicon Image . Specification 1.0 has been around since June 2010. However, it was only introduced on the market in early 2011 in the Samsung Galaxy S II phone .
function
A display device ( HDTV , computer monitor, video projector, etc.) can supply the connected device with power via the MHL connection . For the MHL 1.0 standard, 500 mA is defined at 5 V, 900 mA at 5 V for MHL 2.0. If a mobile device is connected to a corresponding output device, the mobile device can also be controlled with HDMI-CEC -compatible remote controls. An uncompressed video signal with 1080p resolution and an uncompressed 8-channel audio signal (7.1 surround sound) are transmitted . The HDCP encryption is also supported to the playback of DRM to allow -protected media.
Connection socket
MHL is not tied to a specific connector or connector. Most of the time, however, the connection is in the form of a micro USB socket. So far the five-pin standard micro USB socket has been used for this. However, only the mechanics of the USB socket are used, the signals running over it follow the MHL specification, so they are neither USB nor HDMI signals. However, the Samsung Galaxy S III introduced a different eleven-pin socket with extended functionality ( USB on-the-go ) that requires special cables.
| Pin wire color |
Name MHL | Description MHL |
|---|---|---|
| Name USB | Description USB | |
| 1 red |
VBUS | Operating voltage of +5 V / 0.5, 0.9 or 2 A (source) |
| Operating voltage of +5 V / 0.5 A (sink) | ||
| 2 white |
MHL− | Differential line pair for the data |
| Data− | ||
| 3 green |
MHL + | |
| Data + | ||
| 4th | CBUS | Control bus |
| ID | Differentiation between Micro-A and Micro-B connectors | |
| 5 black |
MHL-GND | Signal ground |
| GND | Dimensions | |
| casing |
POWER-GND | Ground for supply voltage |
| ? | shielding |