WM8281ECSSLASHR datasheet(97/392 Pages) CIRRUS

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WM8281

Rev 4.0

Haptic Output (06h)

Haptic Signal

Generator

HAP_ACT

HAP_CTRL

ONESHOT_TRIG

LRA_FREQ

HAP_RATE

Digital Core Output Mixer

DAC

Output Volume

Class D Speaker Driver

DAC

OUTnxMIX_SRCn

OUTnxMIX_VOLn

Haptic Device

Figure 36 Digital Core Haptic Signal Generator

The bracketed number (06h) in Figure 36 indicates the corresponding *_SRCn register setting for

selection of the haptic signal generator as an input to another digital core function.

The haptic signal generator is selected as input to one of the digital core output mixers by setting the

*_SRCn register of the applicable output mixer to (06h).

The sample rate for the haptic signal generator is configured using the HAP_RATE register - see

Table 23. Note that sample rate conversion is required when routing the haptic signal generator

output to any signal chain that is asynchronous and/or configured for a different sample rate.

The haptic signal generator is configured for an ERM or LRA actuator using the HAP_ACT register bit.

The required resonant frequency is configured using the LRA_FREQ field. (Note that the resonant

frequency is only applicable to LRA actuators.)

The signal generator can be enabled in Continuous mode or configured for One-Shot mode using the

HAP_CTRL register, as described in Table 21. In One-Shot mode, the output is triggered by writing to

the ONESHOT_TRIG bit.

In One-Shot mode, the signal generator profile comprises the distinct phases (1, 2, 3). The duration

and intensity of each output phase is programmable.

In Continuous mode, the signal intensity is controlled using the PHASE2_INTENSITY field only.

In the case of an ERM actuator (HAP_ACT = 0), the haptic output is a DC signal level, which may be

positive or negative, as selected by the *_INTENSITY registers.

For an LRA actuator (HAP_ACT = 1), the haptic output is an AC signal; selecting a negative signal

level corresponds to a 180 degree phase inversion. In some applications, phase inversion may be

desirable during the final phase, to halt the physical motion of the haptic device.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R144

(0090h)

Haptics

Control 1

ONESHOT_TRIG

Haptic One-Shot Trigger

Writing ‘1’ starts the one-shot profile (ie.

Phase 1, Phase 2, Phase 3)

3:2

HAP_CTRL [1:0]

Haptic Signal Generator Control

00 = Disabled

01 = Continuous

10 = One-Shot

11 = Reserved

HAP_ACT

Haptic Actuator Select

0 = Eccentric Rotating Mass (ERM)

1 = Linear Resonant Actuator (LRA)

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