Headsets, Headphones, Handsfree - pinouts of mobile phones and other equipment  > HTC pinouts
should work with HTC HD2, 7 Trophy / Spark, Aria, Arrive, AT&T Desire, Desire (CDMA), Droid Eris, DROID Incredible 2, Droid Incredible ADR6300 , EVO 4G, EVO Shift 4G, Freestyle, Google Nexus One GSM, HD7, Hero GSM, Imagio / XV6975, Inspire 4G, Merge, Mytouch 3G 1.2, myTouch 3G Fender, myTouch 3G Slide, myTouch 4G, Sprint / Alltel Hero - CDMA, Sprint / Verizon Touch Pro 2 XV6875, Surround, Thunderbolt, T-Mobile G2, T-Mobile HD2, Touch HD, Verizon Bee / Alltel Wildfire, Verizon / Sprint Nexus One CDMA, Wildfire GSM 3.5mm headphone jack

 

Pin Number Description
1  Left Speaker
2  Right Speaker
3  Ground
4  Microphone

Looks the same as apple iPhone and LG, but different to Motorola, Nokia, Palm or SonyEricsson phones.

Button wiring pin 4 to 3.

No button pressed 47000 ohm (Nexus one) or 33000 ohm (Desire S).

Phone/Play button 1 ohm

Next button 600 ohm

Back button 220 ohm

Measurement made on Nexus One headset and Desire S headset.

The HTC HD2 Headphones are the sames as on the Hero and Nexus One and HTC Desire HD.

The Middle Button is the same as on Apples iPhone Headphones but the outer buttons are incompatible and the Apple mic does not work on HTC Phones.

 


HTC 39H00004-00M headset wires:

Color  Description Pin Number
Green  Left Audio 1
Red  Right Audio 2
Green/Red  Mic Ground 3
Clearcoat (inside the Green/Red)  Mic 4
Blue  Right Audio Ground 3
Gold  Left Audio Ground 3

 

4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the 3.5mm
Source(s) of this and additional information: http://forum.xda-developers.com/showthread.php?t=634379
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