How to Use DRV2605 Motor Controller: Examples, Pinouts, and Specs

The DRV2605 is a haptic motor driver designed to provide precise control of vibration motors, including both Linear Resonant Actuators (LRAs) and Eccentric Rotating Mass (ERM) motors. It features an integrated library of pre-programmed haptic waveforms, making it ideal for creating customizable haptic feedback effects. The device communicates via the I2C interface, enabling seamless integration with microcontrollers and other digital systems.

• Smartphones and tablets for tactile feedback
• Wearable devices such as smartwatches and fitness trackers
• Gaming controllers for immersive haptic effects
• Medical devices requiring precise vibration control
• Automotive touch interfaces

The DRV2605 is a versatile and feature-rich motor driver. Below are its key technical details:

• Operating Voltage: 2.5V to 5.5V
• Output Drive Voltage: Up to 5.5V
• Motor Types Supported: ERM and LRA
• Communication Interface: I2C (7-bit address)
• Built-in Waveforms: Over 100 pre-programmed haptic effects
• Current Consumption:
  • Active mode: ~1.5mA
  • Standby mode: ~10µA
• Operating Temperature: -40°C to 85°C
• Package: 10-pin VSON (3mm x 3mm)

The DRV2605 has 10 pins, as described in the table below:

The DRV2605 is straightforward to use in a circuit. Below are the steps and considerations for integrating it into your design:

1. Power Supply: Connect the VDD pin to a 2.5V to 5.5V power source and GND to ground.
2. Motor Connection: Connect the vibration motor to the OUT+ and OUT- pins.
3. I2C Communication: Connect the SDA and SCL pins to the corresponding I2C lines of your microcontroller. Use pull-up resistors (typically 4.7kΩ) on both lines.
4. Enable Pin: Pull the EN pin high to enable the device.
5. Decoupling Capacitor: Place a 1µF capacitor between VREG and GND for stability.

The DRV2605 is controlled via I2C. Below is an example of how to initialize and play a haptic effect using an Arduino UNO:

#include <Wire.h>

// DRV2605 I2C address
#define DRV2605_ADDR 0x5A

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication for debugging

  // Initialize DRV2605
  Wire.beginTransmission(DRV2605_ADDR);
  Wire.write(0x01); // Mode register
  Wire.write(0x00); // Set to internal trigger mode
  Wire.endTransmission();

  Wire.beginTransmission(DRV2605_ADDR);
  Wire.write(0x03); // Library selection register
  Wire.write(0x06); // Use LRA library
  Wire.endTransmission();

  Wire.beginTransmission(DRV2605_ADDR);
  Wire.write(0x04); // Waveform sequence register
  Wire.write(0x01); // Play waveform 1
  Wire.endTransmission();

  Wire.beginTransmission(DRV2605_ADDR);
  Wire.write(0x0C); // Go register
  Wire.write(0x01); // Start playback
  Wire.endTransmission();

  Serial.println("Haptic effect triggered!");
}

void loop() {
  // No continuous actions required in this example
}

• Motor Selection: Ensure the motor is compatible with the DRV2605 (ERM or LRA).
• Power Supply: Use a stable power source to avoid noise or instability.
• I2C Address: The default I2C address is 0x5A. Ensure no address conflicts on the I2C bus.
• Waveform Selection: Refer to the DRV2605 datasheet for a list of pre-programmed waveforms.

1. Motor Not Vibrating

   • Cause: Incorrect wiring or motor type mismatch.
   • Solution: Verify motor connections and ensure the motor is compatible (ERM or LRA).

2. I2C Communication Fails

   • Cause: Incorrect I2C address or missing pull-up resistors.
   • Solution: Check the I2C address (default is 0x5A) and ensure pull-up resistors are present.

3. Device Not Responding

   • Cause: EN pin not pulled high or insufficient power supply.
   • Solution: Ensure the EN pin is high and the power supply meets the voltage requirements.

4. Unexpected Behavior

   • Cause: Incorrect register configuration.
   • Solution: Double-check the initialization sequence and register values.

Q1: Can the DRV2605 drive multiple motors simultaneously?
A1: No, the DRV2605 is designed to drive a single motor at a time.

Q2: How do I select a specific haptic effect?
A2: Write the desired waveform ID to the waveform sequence register (0x04). Refer to the datasheet for a list of waveform IDs.

Q3: Can I use the DRV2605 with a 3.3V microcontroller?
A3: Yes, the DRV2605 supports a wide operating voltage range (2.5V to 5.5V) and is compatible with 3.3V logic levels.

Q4: What is the difference between ERM and LRA motors?
A4: ERM motors create vibrations by spinning an unbalanced mass, while LRA motors use a spring-mass system for linear motion. The DRV2605 supports both types.

By following this documentation, you can effectively integrate the DRV2605 into your projects and create rich haptic feedback experiences.