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-rw-r--r-- | src/accessories/accessories_toc.cs | 13 | ||||
-rw-r--r-- | src/accessories/headset-spec.jd | 676 | ||||
-rw-r--r-- | src/accessories/images/headset-circuit1.png | bin | 0 -> 102755 bytes | |||
-rw-r--r-- | src/accessories/images/headset-circuit2.png | bin | 0 -> 43239 bytes |
4 files changed, 687 insertions, 2 deletions
diff --git a/src/accessories/accessories_toc.cs b/src/accessories/accessories_toc.cs index d1badbe7..95748f24 100644 --- a/src/accessories/accessories_toc.cs +++ b/src/accessories/accessories_toc.cs @@ -34,8 +34,17 @@ <li><a href="<?cs var:toroot ?>accessories/aoa.html">Version 1.0</a></li> </ul> </li> - <li><a href="<?cs var:toroot ?>accessories/audio.html">Building Audio Accessories</a></li> - <li><a href="<?cs var:toroot ?>accessories/custom.html">Building Custom Accessories</a></li> + <li class="nav-section"> + <div class="nav-section-header"> + <a href="<?cs var:toroot ?>accessories/audio.html"> + <span class="en">Audio Accessories</span> + </a> + </div> + <ul> + <li><a href="<?cs var:toroot ?>accessories/headset-spec.html">Headset specification</a></li> + </ul> + </li> + <li><a href="<?cs var:toroot ?>accessories/custom.html">Custom Accessories</a></li> </li> <!-- End Accessories --> </ul> diff --git a/src/accessories/headset-spec.jd b/src/accessories/headset-spec.jd new file mode 100644 index 00000000..6e9bd69b --- /dev/null +++ b/src/accessories/headset-spec.jd @@ -0,0 +1,676 @@ +page.title=Wired audio headset specification +@jd:body + +<!-- + Copyright 2014 The Android Open Source Project + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--> +<div id="qv-wrapper"> + <div id="qv"> + <h2>In this document</h2> + <ol id="auto-toc"> + </ol> + </div> +</div> + +<p>This document specifies the requirements for headsets and mobile devices to +function uniformly across the Android ecosystem. It is separated into two +sections beginning with the specifications for the headset +accessory followed by the specifications for the mobile device.</p> + +<h2 id=headset_accessory_plug_specifications>Headset Accessory (Plug) Specifications</h2> + +<p>The requirements in the following section apply to the headset accessory.</p> + +<h2 id=functions>Functions</h2> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Accessory Support</strong></p> +</th> + </tr> + <tr> + <td> +<p>Stereo Audio Out</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> + <tr> + <td> +<p>Audio in (Mic)</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> + <tr> + <td> +<p>Ground</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> +</table> + +<h2 id=control-function_mapping>Control-Function Mapping</h2> + +<table> + <tr> + <th> +<p><strong>Control Function</strong></p> +</th> + <th> +<p><strong>Accessory Support</strong></p> +</th> + <th> +<p><strong>Description</strong></p> +</th> + </tr> + <tr> + <td> +<p>Function A</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Play/pause/hook (Short Press), Trigger Assist (Long Press), Next (double press)</p> +</td> + </tr> + <tr> + <td> +<p>Function B</p> +</td> + <td> +<p>Optional</p> +</td> + <td> +<p>Vol+</p> +</td> + </tr> + <tr> + <td> +<p>Function C</p> +</td> + <td> +<p>Optional</p> +</td> + <td> +<p>Vol-</p> +</td> + </tr> + <tr> + <td> +<p>Function D</p> +</td> + <td> +<p>Optional</p> +</td> + <td> +<p>Reserved (Nexus devices will use this reserved function to launch Google Now +voice search)</p> +</td> + </tr> +</table> + +<p><strong>Assign functions to buttons as follows</strong>:</p> + +<ul> + <li> All one-button headsets must implement Function A. + <li> Headsets with multiple buttons must implement functions according to the +following pattern: + <ul> + <li> 2 functions: A and D + <li> 3 functions: A, B, C + <li> 4 functions: A, B, C, D + </ul> +</ul> + +<h2 id=mechanical>Mechanical</h2> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Accessory Support</strong></p> +</th> + <th> +<p><strong>Notes</strong></p> +</th> + </tr> + <tr> + <td> +<p>4 conductor 3.5mm plug</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Ref: EIAJ-RC5325A standard</p> +</td> + </tr> + <tr> + <td> +<p>CTIA pinout order (LRGM)</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Except in regions with legal requirements for OMTP pinout</p> +</td> + </tr> + <tr> + <td> +<p>OMTP pinout order (LRMG)</p> +</td> + <td> +<p>Optional</p> +</td> + <td></td> + </tr> + <tr> + <td> +<p>Microphone</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Must not be obstructed when operating headset controls</p> +</td> + </tr> +</table> + +<h2 id=electrical>Electrical</h2> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Accessory Support</strong></p> +</th> + <th> +<p><strong>Description</strong></p> +</th> + </tr> + <tr> + <td> +<p>Ear speaker impedance</p> +</td> + <td> +<p><strong>16 ohms or higher</strong></p> +</td> + <td> +<p>Recommend 32 - 300 ohms</p> +</td> + </tr> + <tr> + <td> +<p>Mic DC resistance</p> +</td> + <td> +<p><strong>1000 ohms or higher</strong></p> +</td> + <td> +<p>Mic characteristics must be compliant with section 5.4 “Audio Recording” of +current Android Compatibility Definition Document (CDD)</p> +</td> + </tr> + <tr> + <td> +<p>Control Function Equivalent impedance*</p> + +<p>*Total impedance from positive mic terminal to GND when button is pressed with +2.2 V mic bias applied through 2.2 kOhm resistor</p> +</td> + <td> +<p><strong>0 ohm</strong></p> +</td> + <td> +<p>[Function A] Play/Pause/Hook</p> +</td> + </tr> + <tr> + <td></td> + <td> +<p><strong>240 ohm</strong> +/- 1% resistance</p> +</td> + <td> +<p>[Function B]</p> +</td> + </tr> + <tr> + <td></td> + <td> +<p><strong>470 ohm</strong> +/- 1% resistance</p> +</td> + <td> +<p>[Function C] </p> +</td> + </tr> + <tr> + <td></td> + <td> +<p><strong>135 ohm</strong> +/- 1% resistance</p> +</td> + <td> +<p>[Function D]</p> +</td> + </tr> +</table> + +<h2 id=reference_headset_test_circuit_1>Reference Headset Test Circuit 1</h2> + +<img src="images/headset-circuit1.png" alt="Reference Headset Test Circuit 1" /> +<p class="img-caption"><strong>Figure 1.</strong> Reference headset test circuit 1</p> + +<p class="note"><strong>Note:</strong> Four-segment plug shows CTIA pinout. For OMTP pinout, please swap MIC and +GND segments</strong></p> + +<h2 id=reference_headset_test_circuit_2>Reference Headset Test Circuit 2</h2> + +<img src="images/headset-circuit2.png" alt="Reference Headset Test Circuit 2" /> +<p class="img-caption"><strong>Figure 2.</strong> Reference headset test circuit 2</p> + +<p><strong>Note</strong>: The second reference circuit above illustrates how the actual resistor values +(R1 - R4) will change based on the microphone capsule resistance to achieve the +equivalent impedance values as required by the specification. The example above +assumes a 5 kOhm microphone impedance. Therefore, as an example, to achieve an +equivalent R4 impedance of 135 Ohm, the actual R4 resistor value needs to be +139 Ohms.</p> + +<h2 id=mobile_device_jack_specifications>Mobile Device (Jack) Specifications</h2> + +<p>The requirements in the following section apply to the 3.5 mm jack on Android +mobile devices.</p> + +<p><strong>Headset Jack Functions</strong></p> +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Device Support</strong></p> +</th> + </tr> + <tr> + <td> +<p>Stereo Audio Out</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> + <tr> + <td> +<p>Audio in (Mic)</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> + <tr> + <td> +<p>Ground</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + </tr> +</table> + +<h2 id=software_mapping>Software mapping</h2> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Device Support</strong></p> +</th> + <th> +<p><strong>Description</strong></p> +</th> + </tr> + <tr> + <td> +<p>Function A control event </p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>input event KEY_MEDIA</p> + +<p>Android key KEYCODE_HEADSETHOOK</p> +</td> + </tr> + <tr> + <td> +<p>Function D control event</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>input event KEY_VOICECOMMAND</p> + +<p>Android key KEYCODE_VOICE_ASSIST</p> +</td> + </tr> + <tr> + <td> +<p>Function B control event</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>input event KEY_VOLUMEUP</p> + +<p>Android key VOLUME_UP</p> +</td> + </tr> + <tr> + <td> +<p>Function C control event</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>input event KEY_VOLUMEDOWN</p> + +<p>Android key VOLUME_DOWN</p> +</td> + </tr> + <tr> + <td> +<p>Headset insertion detection</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>input event SW_JACK_PHYSICAL_INSERT 7</p> +</td> + </tr> + <tr> + <td> +<p>Headset type detection</p> +</td> + <td> +<p><strong>Mic</strong></p> +</td> + <td> +<p>input event SW_MICROPHONE_INSERT 4</p> +</td> + </tr> + <tr> + <td> +<p>Headset type detection</p> +</td> + <td> +<p><strong>No Mic</strong></p> +</td> + <td> +<p>input event SW_HEADPHONE_INSERT 2</p> +</td> + </tr> + <tr> + <td> +<p>Headset speaker impedance</p> +</td> + <td> +<p><strong>Required Headphone (low)</strong></p> +</td> + <td> +<p>Failure mode is to indicate headphones so that limitation would be on</p> +</td> + </tr> + <tr> + <td> +<p>Headset speaker impedance</p> +</td> + <td> +<p><strong>Required Line In (high)</strong></p> +</td> + <td> +<p>input event SW_LINEOUT_INSERT 6</p> +</td> + </tr> +</table> + +<h2 id=mechanical11>Mechanical</h2> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Device Support</strong></p> +</th> + <th> +<p><strong>Description</strong></p> +</th> + </tr> + <tr> + <td> +<p>4 conductor 3.5mm jack</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td></td> + </tr> + <tr> + <td> +<p>CTIA pinout order (LRGM)</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>3 Pin & Mono Plug Compatible</p> +</td> + </tr> + <tr> + <td> +<p>OMTP pinout order (LRMG)</p> +</td> + <td> +<p>Optional but <strong>Strongly Recommended</strong></p> +</td> + <td></td> + </tr> + <tr> + <td> +<p>Headset detect sequence</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Plug insert notification must only be triggered after all contacts on plug are +touching their relevant segments. This will prevent unreliable headset +detection due to slow insertion. </p> +</td> + </tr> +</table> + +<h2 id=electrical12>Electrical</h2> + +<h3 id=general>General</h3> + +<table> + <tr> + <th> +<p><strong>Function</strong></p> +</th> + <th> +<p><strong>Device Support</strong></p> +</th> + <th> +<p><strong>Notes</strong></p> +</th> + </tr> + <tr> + <td> +<p>Minimum output voltage drive capacity </p> +</td> + <td> +<p>150mV </p> +</td> + <td> +<p>>= 150mV on 32 ohm</p> + +<p>Test conditions: EN50332-2</p> +</td> + </tr> + <tr> + <td> +<p>Mic bias resistance </p> +</td> + <td> +<p>Required</p> +</td> + <td> +<p>Flexible on detection method used and microphone bias resistor selection. +Require that all button resistance value ranges specified below be detected and +related to their respective function</p> +</td> + </tr> + <tr> + <td> +<p>Mic bias voltage</p> +</td> + <td> +<p>1.8V - 2.9V</p> +</td> + <td> +<p>To guarantee compatibility to common microphone capsules.</p> +</td> + </tr> +</table> + +<h3 id=function_impedance_and_threshold_detection>Function Impedance and Threshold Detection</h3> + +<p>Devices must detect the following resistor ladder on the accessories. The +accessories will be tested to the standardized circuit diagram in the diagram +illustrated earlier (Reference Headset Test Circuit) where the total impedance +is measured from MIC terminal to GND when a button is pressed with 2.2V mic +bias applied through 2.2 kOhm resistor. This is the same effective resistance +as the button detection circuit with the microphone in parallel with the button +resistor.</p> +<table> + <tr> + <th> +<p><strong>Button Impedance Level</strong></p> +</th> + <th> +<p><strong>Device Support</strong></p> +</th> + <th> +<p><strong>Notes</strong></p> +</th> + </tr> + <tr> + <td> +<p><strong>70 ohm or less</strong></p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>[Function A]</p> +</td> + </tr> + <tr> + <td> +<p><strong>110 - 180 ohm </strong></p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>[Function D]</p> +</td> + </tr> + <tr> + <td> +<p><strong>210 - 290 ohm</strong></p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>[Function B]</p> +</td> + </tr> + <tr> + <td> +<p><strong>360 - 680 ohm </strong></p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>[Function C]</p> +</td> + </tr> + <tr> + <td> +<p><strong>Headset speaker impedance level</strong></p> +</td> + <td></td> + <td></td> + </tr> + <tr> + <td> +<p>Low Threshold Detection</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Headphone (low) < 1 Kohm</p> +</td> + </tr> + <tr> + <td> +<p>High Threshold Detection</p> +</td> + <td> +<p><strong>Required</strong></p> +</td> + <td> +<p>Line In (high) > 5 Kohm</p> +</td> + </tr> +</table> diff --git a/src/accessories/images/headset-circuit1.png b/src/accessories/images/headset-circuit1.png Binary files differnew file mode 100644 index 00000000..c69df98e --- /dev/null +++ b/src/accessories/images/headset-circuit1.png diff --git a/src/accessories/images/headset-circuit2.png b/src/accessories/images/headset-circuit2.png Binary files differnew file mode 100644 index 00000000..67bd5b49 --- /dev/null +++ b/src/accessories/images/headset-circuit2.png |