PalmOne Treo 650, 700, 755p and Centro headset / handsfree diagram

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PDA connectors and cables 4 conductor diagram

4 pin 3.5mm (2.5mm) plug connector layout 4 pin 3.5mm (2.5mm) plug connector at the headset cable

Pin Name Description
1 Left audio channel (tip)
2 Right audio channel (1st ring)
3 Microphone input channel (2nd ring)
4 Ground Common ground


  • If 3-pin 2.5 mm standard headphone headset detected, the pinout is following: pin 1 (tip) - mic, pin 2 - earbud, pin 3 - ground.


Category:PDA Connectors


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