DA7281-00FVC datasheet(22/76 Pages) DIALOG

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DA7281

LRA/ERM Haptic Driver with Multiple I²C Addresses,

Integrated Waveform Memory, and Wideband Support

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

22 of 76

5.2.6

If sequence consistency or I2C bus availability is a concern, register triggered waveform memory

mode (RTWM) mode can be used to play back previously defined sequences from the Waveform

Memory, see Section 5.8, via I2C register trigger only. Enter this mode by setting

OPERATION_MODE = 3.

5.2.6.1

I2C Triggering and Sequence Looping

Sequence selection is done via PS_SEQ_ID with the additional option to loop the sequence up to

16 times using PS_SEQ_LOOP. To trigger a sequence, set SEQ_START = 1. Once a sequence

completes, the event is reported by dropping the nIRQ pin low and signaling via SEQ_DONE_M.

To repeat a sequence immediately following completion of playback, set SEQ_CONTINUE = 1.

5.2.7

Edge Triggered Waveform Memory Mode

If there is no host available, or for minimal host interaction, edge triggered waveform memory mode

(ETWM) mode can be used to play back a previously defined sequences from the Waveform

Memory, see Section 5.8, via external GPI edge trigger or also via I2C trigger, as in RTWM mode.

The ETWM is also useful if deterministic timing is required without reliance on the I2C bus.

The GPI/PWM pin can be configured and will react according to the setting in GPI_POLARITY as

follows:

● Rising edge trigger, GPI_POLARITY = 0: only a rising GPI edge creates an event that triggers a

pre-programmed sequence.

● Falling edge trigger, GPI_POLARITY = 1: only a falling GPI edge creates an event that triggers a

pre-programmed sequence.

● Rising and falling edge trigger, GPI_POLARITY = 2: both edges create events that trigger a pre-

programmed sequence.

Any event received during playback from pin GPI/PWM after the initial GPI trigger event will result in

a sequence stop.

● There are two ways of reacting to a GPI event based on GPI_MODE:

● Single sequence, GPI_MODE = 0: no matter how many times the GPI is triggered, it will play the

sequence located at GPI_SEQUENCE_ID.

● Multi-sequence, GPI_MODE = 1: odd GPI events trigger the sequence at GPI_SEQUENCE_ID,

while even GPI events trigger the sequence located at the value of GPI_SEQUENCE_ID + 1 bit.

In ETWM mode, a maximum of two different sequences can be configured when multi-sequence

mode is enabled. The desired haptic sequence for the GPI must be set by programming

GPI_SEQUENCE_ID.

Once a sequence has finished playing, a signal is sent via the nIRQ pin and DA7281 automatically

returns to IDLE state, assuming STANDBY_EN = 0, to await the next trigger event.

Sequence looping operates in the same way as RTWM mode, see Section 5.2.6.1.

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