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Terminal Descriptions
3.5 mm phone jack
No. Name Description Impedance I/O
1 GND Ground Ground −
2 EXTPTT External PTT Detection 47 k
I
3 MIC External MIC Input 1.8 k
I
4 EXTSP Internal Audio Output 32
O
5 Not used − − −
6 Not used − − −
7 Not used − − −
Micro USB jack (B type)
No. Name Description Impedance I/O
1 VBUS USB Detect 13 k
I
2 D- DATA High Impedance/ 44
I/O
3 D+ DATA High Impedance/ 44
I/O
4ID NC − NC
5 GND Ground Ground −