Connector - Ericsson 218/337/318/388UNKNOWN CONNECTOR| Pin | Direction | Description |
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| 1 | Input | Voice | | 2 | Input | +5V=External Power, 0V=Battery | | 3 | Output | Ext Speak control | | 4 | --- | Analog GND | | 5 | Output | Voice | | 6 | Output | +5V=POWER ON, 0V=POWER OFF | | 7 | Output | Charger control | | 8 | --- | Digital/DC GND | | 9 | Input | 0V=normal,+5V=test, +12V=test+flash | | 10 | Input | Hook | | 11 | Input | TTL serial in | | 12 | Output | TTL serial out | | 13 | Input | 0V for aprox 1 sec = POWER ON/OFF | | 14 | Input | DC Power supply |
Direction is phone relative world.
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