WM8281ECSSLASHR datasheet(98/392 Pages) CIRRUS

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WM8281

Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R145

(0091h)

Haptics

Control 2

14:0

LRA_FREQ

[14:0]

7FFFh

Haptic Resonant Frequency

Selects the haptic signal frequency (LRA

actuator only, HAP_ACT = 1)

Haptic Frequency (Hz) =

System Clock / (2 x (LRA_FREQ+1))

where System Clock = 6.144MHz or

5.6448MHz, derived by division from

SYSCLK or ASYNCCLK.

If HAP_RATE<1000, then SYSCLK is the

clock source, and the applicable System

Clock frequency is determined by

SYSCLK.

If HAP_RATE>=1000, then ASYNCCLK is

the clock source, and the applicable

System Clock frequency is determined by

ASYNCCLK.

Valid for Haptic Frequency in the range

100Hz to 250Hz

For 6.144MHz System Clock:

77FFh = 100Hz

4491h = 175Hz

2FFFh = 250Hz

For 5.6448MHz System Clock:

6E3Fh = 100Hz

3EFFh = 175Hz

2C18h = 250Hz

R146

(0092h)

Haptics

phase 1

intensity

7:0

PHASE1_INTEN

SITY [7:0]

00h

Haptic Output Level (Phase 1)

Selects the signal intensity of Phase 1 in

one-shot mode.

Coded as 2’s complement.

Range is +/- Full Scale (FS).

For ERM actuator, this selects the DC

signal level for the haptic output.

For LRA actuator, this selects the AC peak

amplitude; Negative values correspond to

a 180 degree phase shift.

R147

(0093h)

Haptics

Control

phase 1

duration

8:0

PHASE1_DURAT

ION [8:0]

000h

Haptic Output Duration (Phase 1)

Selects the duration of Phase 1 in one-

shot mode.

000h = 0ms

001h = 0.625ms

002h = 1.25ms

… (0.625ms steps)

1FFh = 319.375ms

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