8.3.5.2 Internal Memory Interface

The DRV2604LL device is designed with 2 kB of integrated RAM for waveform storage used by the playback engine. The data is stored in an efficient way (voltage-time pairs) to maximize the number of waveforms that can be carried. The playback engine also has the ability to generate smooth ramps (up or down) by relying on the start-waveform and end-waveform points and by using linear interpolation techniques.

Storing waveforms on the DRV2604LL device instead of the host processor has several advantages including:

• Offloading processing requirements, such as PWM generation, from the host processor or micro-controller
• Improving latency by storing the waveforms on the DRV2604LL device and only requiring a trigger signal
• Reducing I²C traffic by eliminating the requirement to transfer waveform data