Pin #

Pin name

Pin description

1

DCIO

DC+ pole for charging phone battery and external accessory powering.

2

GND

Digital GND and DC return.

3

VPPFLASH

Flash memory Vpp /Service.

4

GND

Audio signal GND, 0 V reference.

5

CFMS_PHFS¹

Accessory Control From Mobile Station serial (ACB) communication/ Portable Hands Free Sense.

6

CTMS¹

Accessory Control To Mobile Station serial (ACB) communication.

7

DFMS²

Data From Mobile Station, serial bus communication.

8

DTMS²

Data To Mobile Station, serial bus communication/External accessory Power on

9

CTS_ON

Mobile station Clear To Send/ ON REQuest

10

AFMS/RTS

Audio from Mobile station/ Ready To Send

11

ATMS

Audio to Mobile station