DA7280 datasheet(44/76 Pages) DIALOG

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DA7280

LRA/ERM Haptic Driver with Multiple Input Triggers,

Integrated Waveform Memory and Wideband Support

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

44 of 76

For example, assuming ACCELERATION_EN = 1, the snippet shown in Figure 25 creates a

waveform that ramps from zero to an amplitude of 1111 over a period of 2 timebases, then step from

1111 to 1000, and remains there for 4 timebases. The length (in milliseconds) of a timebase is

specified using the TIMEBASE frame bits, see Section 5.8.3.

Description

RMP

TIME[6:4]

AMP[3:0]

Ramp

Step

Amplitude

Timebase

1111

1000

Figure 25: Snippet Ramp and Step with ACCELERATION_EN = 1

If a constant drive level of longer than 8 timebases is required, set RMP = 0 for subsequent PWL

points.

A generic example of a snippet is shown in Figure 26. Pn represents the PWL pair located at

amplitude An and with time step Tn, where n represents the PWL pair number. Note that a snippet

played at the start of a non-looped sequence will start from a default point P0 set at zero amplitude;

however, if the snippet is not at the start of a sequence or is read during the looping of a sequence,

the starting point will be the last played PWL point.

T0 = 0

Amplitude

[%]

Time

T0 = 0

Amplitude

[%]

T0 = 0

Amplitude

[%]

RMP = 1 for all PWL points

RMP = 0 for all PWL points

Time

Figure 26: Snippet Example

Note 1

A built-in snippet containing a single silent PWL point (amplitude = 0) is available by setting

SNP_ID = 0. The duration is set to 2 timebases. Because of the existence of this snippet, customer

defined snippets start at SNP_ID = 1. The snippet is inherent to the decoding and is not actually stored

in the waveform memory. The number of snippets (byte 0) does not include snippet 0 and there is no

end pointer for snippet 0 stored in the waveform memory.

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