Ericsson T10S, T18S, A1018S, 628, 688, 788 cell phones

12 pin Ericsson cellphone special connector at the cellular phone

Pin	Description	Comments
1	Audio Out
2	Audio In
3	Accessory Sense. GND to enable External Mic and Speaker (Analog)
4	Audio Signal GND
5	Portable handsfree In.	Internal/external mic and ear (0=External - open=Internal)
6	Music Mute Out, High when phone is used.
7	In Flash Memory Voltage and Service Voltage, In 0V=normal,+5V=test, +12V=test+flash	Test. Switch phone off and provide +5V and switch back on. (set comms at 9600, n,8,1)
8	Logic Out, Status On. Sources over 100mA.	+5V output
9	TX (Data Out) from Mobile Station. Debug messages appear here at 112KBaud when in debug mode.	TTL
10	Digital Ground and DC return
11	Rx (Data in)	TTL
12	DC in for battery charging, DC out for accessory power	+ external power supply 7.2Volt - 600mA