SLOS825E December 2012 – April 2018 DRV2605
The I2C interface is required to configure the device. The device can be used fully with the I2C interface and with either RTP or internal memory. The advantage of using the I2C interface is that no additional GPIO (for the IN/TRIG pin) is required for firing effects, and no PWM signal is required to be generated. Therefore the IN/TRIG pin can be connected to GND. Using the external trigger pin has the advantage that no I2C transaction is required to fire the pre-loaded effect, which is a good choice for interfacing with a button. The PWM interface is available for backward compatibility. If audio-to-vibe is desired, then use C(IN) as shown in Figure 55.