DRV2667RGPR datasheet(21/51 Pages) TI2

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Table 7-3. Waveform Chunk Bytes for Synthesizer (continued)

BYTE

NAME

DESCRIPTION

Envelope

The envelope byte is divided into two nibbles. The upper nibble, bits [7:4], sets the ramp-up rate

at the beginning of the synthesized sinusoid, and the lower nibble, bits [3:0], sets the ramp-down

rate at the end of the synthesized sinusoid. The user must note that the ramp-up time is included

in the duration parameter of the waveform, and the ramp-down time is appended to the duration

parameter of the waveform. As such, if a ramp-up time is used, the ramp-up time must be less

than the duration time as programmed in byte 3. Also note that the Total Ramp Time is for a

ramp to full-scale amplitude (amplitude = 0xFF). Ramps to a fraction of full-scale have the same

fraction of the Total Ramp Time.

Nibble Value

Total Ramp Time

No Envelope

32 ms

64 ms

96 ms

128 ms

160 ms

192 ms

224 ms

256 ms

512 ms

768 ms

1024 ms

1280 ms

1536 ms

1792 ms

2048 ms

7.5.3.2.1 Programming the Waveform Sequencer

To play the effects stored in memory, the effects must be loaded into the waveform sequencer. The effects can

then be launched by the use of the GO bit.

The waveform sequencer queues up to eight waveform identifiers for playback. A waveform identifier is an

integer value referring to the index position of a waveform in the Header Block (see Figure 7-6). Upon assertion

of the GO bit, playback begins at register 0x03. When playback of that waveform ends, the waveform sequencer

plays the next waveform identifier in register 0x04 if the identifier stored in register 0x04 is non-zero. Th

waveform sequencer continues in this way until the sequencer reaches an identifier value of zero or until all eight

identifiers are played as shown in Figure 7-9.

WAVFORM0[7:0]

WAVFORM1[7:0]

WAVFORM2[7:0]

WAVFORM3[7:0]

WAVFORM4[7:0]

WAVFORM5[7:0]

WAVFORM6[7:0]

WAVFORM7[7:0]

Effect 1

Effect 2

Effect 3

Effect 4

Effect 5

Effect N

RAM

Waveform Sequencer

Figure 7-9. Waveform Sequencer

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DRV2667

SLOS751E – MARCH 2013 – REVISED JANUARY 2023

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