Sony Ericsson Secrets

Each command has to be followed by a 0x0A, 0x0D sequence, that is carriage return - line feed. These commands will be ackowledged with an 'OK' prompt. An incoming call is signalled by the string 'RING' sent by the phone at 9600b in normal mode.

Portable Handsfree Unit

1 Earphone: 16 Ohm
2 Microphone: <- 2 kOhm
5 Connected to 04 (GND)
Pinouts

Left to right, keyboard up.

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.

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

8 Logic Out, Status On. Sources over 100mA

9 Data Out from Mobile Station. Debug messages appear here at 112KBaud when in debug mode.

10 Digital Ground and DC return

11 Data in

12 DC in for battery charging, DC out for accessory power