DA7280 datasheet(45/76 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

45 of 76

5.8.3

Frame Definition

A frame consists of a collection of parameters used to define the playback of a snippet with differing

gain, time base, carrier frequency, and number of repetitions. A frame consists of up to three bytes,

its structure is shown in Figure 27. The frame parameters can be easily set up using the Dialog

SmartCanvas GUI.

● Byte 1 is mandatory. For byte 1, always set COMMAND_TYPE = 0. If set incorrectly, the device

will generate an interrupt of the type E_MEM_FAULT.

● Byte 2 is optional. When used, set COMMAND_TYPE = 1 in Byte 2.

● Byte 3 is optional, for use in wideband sequences only, and contains the frame frequency's eight

LSBs.

If COMMAND_TYPE of frame Byte 2 is set to 1 and FREQ_CMD = 1, then the Byte 3 contains drive

frequency data to enable wideband LRA support.

All frame parameters except COMMAND_TYPE, SNP_ID_L, GAIN, and TIMEBASE are optional. For

a full description, see Table 18.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Byte 1 =>

COMMAND_TYPE

= 0

GAIN [1:0]

TIMEBASE[1:0]

SNP_ID_L[2:0]

Byte 2 =>

COMMAND_TYPE

= 1

SNP_ID_LOOP[3:0]

FREQ_CMD

FREQ[8]

SNP_ID_H

Byte 3 =>

FREQ[7:0]

Figure 27: Command Structure for a Single Frame

Table 18: Bit Definitions for Frame Parameters

Byte

Number

Definitions

Description

1 and/or 2

COMMAND_TYPE

COMMAND_TYPE labels the byte and tells the system how to interpret the

following seven LSBs.

COMMAND_TYPE = 0 in Byte 1

COMMAND_TYPE = 1 signifies Byte 2 is present following Byte 1

GAIN[1:0]

Gain applied to the snippet identified by SNP_ID_L/H:

00 = 0 dB

01 = -6 dB

10 = -12 dB

11 = -18 dB

TIMEBASE[1:0]

The timebase length of the snippet pointed to by the snippet ID. This

FREQ_WAVEFORM_TIMEBASE:

If FREQ_WAVEFORM_TIMEBASE = 0 (default):

00 = 5.44 ms

01 = 21.76 ms

10 = 43.52 ms

11 = 87.04 ms

If FREQ_WAVEFORM_TIMEBASE = 1:

00 = 1.36 ms

01 = 5.44 ms

10 = 21.76 ms

11 = 43.52 ms

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