| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | VCHARGE | battery charging voltage IN (max. 2A) |
| 2 | VCHARGE | battery charging voltage IN (max. 2A) |
| 3 | VBATTERY | 6 V output to accessories (max. 0.5A) |
| 4 | V-PROG | flash programming voltage (0.5/12 VDC) |
| 5 | EXTMIC+PWR | external audio from the microphone (typ. 400 mVrms) |
| 6 | GND | |
| 7 | GND | |
| 8 |
EXTERP+HOOK |
external audio to the speaker amplifier (220 mVrms) |
| 9 | !PTTX | external PTT input, 0V active (0/5V) |
| 10 | I2C_INT | i2c interrupt, radio input (0/5V) |
| 11 | SCL | I2C clock |
| 12 | SDA | I2C data |
| 13 | TXD | serial out (0/5V) |
| 14 | RXD | serial in (0/5V) |
| 15 | EXTIO | |
| 16 | CHGCONT | charging control voltage (analog) |
