WM8991 datasheet(86/174 Pages) WOLFSON

Part #	WM8991

Description	Mobile Multimedia CODEC with Dual-Mode Class AB/D Speaker Driver

PDF	174 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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86 / 174 page

WM8991

Pre-Production

PP, May 2008, Rev 3.1

ALTERNATIVE DAC INTERFACE

The WM8991 may be configured to select between two different audio interfaces, providing the

capability to receive DAC input data via BCLK2, DACLRC2 and DACDAT2 instead of BCLK,

DACLRC and DACDAT. This selection is made by register bit AIF_SEL, as described in Table 45.

To use the alternative DAC interface, the following register settings are required:

•

AIF_TRIS = 0

•

AIF_SEL = 1

•

GPIO3_PU = 0, GPIO4_PU = 0, GPIO5_PU = 0

•

GPIO3_PD = 0, GPIO4_PD = 0, GPIO5_PD = 0

Note that additional devices can also be connected to the main interface pins using the TDM mode.

See "Digital Audio Interface" section for further details on controlling the audio interface pins.

The alternative DAC interface connection is illustrated in Figure 42.

DIGITAL AUDIO

INTERFACE

A-law and u-law support

TDM Support

GPIO

Alternative DAC Interface

Alternative MCLK

Button Control / Accessory Detect

Clock Output

Inverted ADCLRC

Processor #2

Processor #1

AIF_SEL

Figure 42 Alternative DAC Interface

WM8991 Datasheet(PDF) 86 Page - Wolfson Microelectronics plc