WM8281ECSSLASHR datasheet(200/392 Pages) CIRRUS

200 / 392 page

WM8281

200

Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R659

(0293h)

Accessory

Detect

Mode 1

ACCDET_SRC

Accessory Detect / Headphone Feedback

pin select

0 = Accessory detect on MICDET1,

Headphone ground feedback on

HPOUT1FB1

1 = Accessory detect on MICDET2,

Headphone ground feedback on

HPOUT1FB2

Table 71 Headphone Output (HPOUT1) Ground Feedback Control

Earpiece

The HPOUT1FB1 or HPOUT1FB2 pin is

selected by the ACCDET_SRC register bit.

WM8281

HPOUT1L

HPOUT1R

HPOUT1FB1

HPOUT2L

HPOUT2R

HPOUT2FB

HPOUT1FB2

HPOUT3L

HPOUT3R

HPOUT3FB

Each headphone output can support stereo (single-

ended) or mono (differential) output. The illustration

shows the configuration for a typical application.

Figure 57 Headphone and Earpiece Connection

SPEAKER OUTPUTS (ANALOGUE)

The speaker driver outputs SPKOUTLP, SPKOUTLN, SPKOUTRP and SPKOUTRN provide two

differential (BTL) outputs suitable for direct connection to external loudspeakers. The integrated Class

D speaker driver provides high efficiency at large signal levels.

The speaker driver signal paths incorporate a boost function which shifts the signal levels between the

AVDD and SPKVDD voltage domains. The boost is pre-configured (+12dB) for the recommended

AVDD and SPKVDD operating voltages (see “Recommended Operating Conditions”).

Ultra-low leakage and high PSRR allow the speaker supply SPKVDD to be connected directly to a

lithium battery. Note that SPKVDDL powers the Left Speaker driver, and SPKVDDR powers the Right

Speaker driver; it is assumed that SPKVDDL = SPKVDDR = SPKVDD.

Note that SYSCLK must be present and enabled when using the Class D speaker output; see

“Clocking and Sample Rates” for details of SYSCLK and the associated register control fields.

The OUT4L and OUT4R output signal paths are associated with the analogue outputs SPKOUTLP,

SPKOUTLN, SPKOUTRP and SPKOUTRN.

The Class D speaker output is a pulse width modulated signal, and requires external filtering in order

to recreate the audio signal. With a suitable choice of external speakers, the speakers themselves can

provide the necessary filtering. See “Applications Information” for further information on Class D

speaker connections.

The external speaker connection is illustrated in Figure 58, assuming suitable speakers are chosen to

provide the PWM filtering.

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