DA7281 datasheet(57/88 Pages) RENESAS

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DA7281

LRA/ERM Haptic Driver with Multiple I²C

Addresses, Integrated Waveform Memory, and

Wideband Support

Datasheet

Revision 3.1

10-Feb-2022

CFR0011-120-00

57 of 87

5.9.2

PWM Mode

PWM provides mark / space ratio between 0 % and 100 %. The interpretation of duty cycle depends

on the state of ACCELERATION_EN.

● For ACCELERATION_EN = 0:

○ A 0 % duty cycle corresponds to -100 % driving strength.

○ A 50 % duty cycle corresponds to no drive.

○ A 100 % duty cycle corresponds to +100 % driving strength.

○ FULL_BRAKE_THR defines a lower threshold for driving strength, below this threshold, drive

is interpreted as zero.

● For ACCELERATION_EN = 1:

○ A 0 % duty cycle corresponds to no drive.

○ A 50 % duty cycle corresponds to +50 % driving strength.

○ A 100 % duty cycle corresponds to +100 % driving strength.

○ Negative drive is not possible.

○ FULL_BRAKE_THR defines a lower threshold for driving strength, below this threshold, drive

is interpreted as zero.

The encoded value of PWM data is converted to 8-bit two

’s complement data using the DRO format

and is written to OVERRIDE_VAL so it can be read back.

5.9.3

RTWM and ETWM Modes

● For ACCELERATION_EN = 0:

○ The 4 bits of the amplitude value are interpreted as a two’s complement signed value.

○ The most negative value corresponds to -100 % driving strength.

○ The most positive value corresponds to +100 % driving strength.

○ A zero value corresponds to no drive.

● The full range is between 7 (100 %) and -7 (-100 %), with -8 interpreted as -7 to keep the ranges

symmetrical.ACCELERATION_EN = 1

○ The 4 bits of the amplitude value are interpreted as an unsigned value.

○ The most positive value corresponds to +100 % driving strength.

○ Negative drive is not possible.

○ A zero value corresponds to no drive.

DA7281 Datasheet(PDF) 57 Page - Renesas Technology Corp

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