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| 1 | V_IN - Charger Input Voltage 8,4 V, 0,8 A |
| 2 | CHRG - CTRL Charger Control PWM 32 kHz |
| 3 | XMIC - Mic Input 60mV - 1V |
| 4 | SGND - Signal Ground |
| 5 | XEAR - Ear Output 80mV - 1V |
| 6 | MBUS 9.600 B/s |
| 7 | FBUS_RX 9,6 - 230,4 KB/s |
| 8 | FBUS_TX 9,6 - 230,4 KB/s |
| 9 | L_GND - Charger/Logic Ground |