PCA9685PW 16 Output Channels Linear PWM Dimming 25mA TSSOP28

Description

PCA9685PW 16 Output Channels Linear PWM Dimming 25mA TSSOP28

The PCA9685PW is a 16-channel, 12-bit PWM LED controller from NXP Semiconductors, housed in a TSSOP-28 package.

Key Specifications:

• Number of Channels: 16
• PWM Resolution: 12-bit (4096 steps)
• Control Interface: I²C-bus, supporting Fast-mode Plus (Fm+) up to 1 MHz
• Operating Voltage: 2.3 V to 5.5 V
• Maximum Output Current per Channel: 25 mA
• Maximum Output Voltage per Channel: 5.5 V
• PWM Frequency: Programmable from 24 Hz to 1526 Hz
• Package: TSSOP-28

This controller is optimized for applications like RGB backlighting and LED status indicators, providing precise brightness control for each LED channel.

For detailed electrical characteristics and application guidelines, please refer to the PCA9685 datasheet.

The PCA9685PW can be used to control both servo motors and DC motors, but with some considerations:

🔹 Controlling Servo Motors

✅ PCA9685 is perfect for servos because:

• It provides 16 independent PWM outputs
• 12-bit resolution (4096 steps) allows precise servo movement
• I²C control means you only need two wires (SDA, SCL)
• Works with 3.3V and 5V logic (compatible with most microcontrollers)

📌 Example: You can connect servo motors (e.g., SG90, MG995) and control them by setting the PWM duty cycle to pulse widths between 500µs and 2500µs (typical servo range).

🔹 Controlling DC Motors

✅ but with an external motor driver (H-Bridge like L293D, TB6612FNG, or MOSFETs)
🔸 Why? The PCA9685 only provides PWM signals (not direct motor current).

• Use PCA9685 PWM outputs to control motor driver inputs (ENA, ENB, PWM1, PWM2, etc.)
• The motor driver will amplify the PWM signals to provide sufficient current to DC motors

📌 Example:

• PCA9685 → Controls TB6612FNG motor driver
• TB6612FNG → Drives the DC motors

🚀 Summary