Pinout
PCA9685 16-ch PWM/servo driver pinout
Pins
- GND
- OE (output enable, active low — leave open for always-on)
- SCL / SDA (I2C, address 0x40 + solder jumpers A0–A5)
- VCC (logic 3.3–5V)
- V+ (SERVO power 5–6V — separate supply, the green terminal, not the MCU 5V)
- 16 channels × 3 pins each: PWM / V+ / GND, standard servo plug order
- 12-bit PWM at 24–1526 Hz — set ~50 Hz for servos
Specifications
| Logic supply (VCC) | 2.3–5.5 V |
|---|---|
| Servo supply (V+) | 5–6 V, separate supply |
| Interface | I2C, up to 1 MHz |
| I2C address | 0x40 default; 0x40–0x7F via A0–A5 (0x70 all-call) |
| Channels | 16 |
| PWM resolution | 12 bit (4096 steps) |
| PWM frequency | 24–1526 Hz (≈50 Hz for servos) |
| Output current | 25 mA sink / 10 mA source per pin (at 5 V) |
| Board size | ≈62 × 25 mm |
