SLOS825E December 2012 – April 2018 DRV2605
The DRV2605 device includes continuous haptic modes (such as PWM and RTP mode) as well as triggered modes (such as the internal memory interface). The haptic effects in the continuous haptic modes begin as soon as the device enters the mode and stop when the device goes into standby mode or exits the continuous haptic mode. For the triggered mode, the DRV2605 device has a variety of trigger options that are explained in this section.
In the continuous haptic modes, the IN/TRIG pin provides external trigger control of the GO bit, which allows GPIO control to fire ROM waveforms. The external trigger control can provide improved latencies in systems where a significant delay exists between the desired effect time and the time a GO command can be sent over the I2C interface.
The triggered effect must already be selected to take advantage of the lower latency. This option works best for accelerating a pre-queued high-priority effect (such as a button press) or for the repeated firing of the same effect (such as scrolling).