WM9715L datasheet(13/77 Pages) WOLFSON

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Production Data

WM9715L

PD Rev 4.0 December 2007

DEVICE DESCRIPTION

INTRODUCTION

The WM9715L is designed to meet the mixed-signal requirements of portable and wireless computer

systems. It includes audio recording and playback, touchpanel digitisation, battery monitoring,

auxiliary ADC and interrupt functions, all controlled through a single 5-wire AC-Link interface.

SOFTWARE SUPPORT

The basic audio features of the WM9715L are software compatible with standard AC’97 device

drivers. However, to better support the touchpanel and other additional functions, Wolfson

Microelectronics supplies custom device drivers for selected CPUs and operating systems. Please

contact your local Wolfson Sales Office for more information.

AC’97 COMPATIBILITY

The WM9715L uses an AC’97 interface to communicate with a microprocessor or controller. The

audio functions are largely compliant with AC’97 Revision 2.2. The following differences from the

AC’97 standard are noted:

•

Pinout: The function of some pins has been changed to support device specific features.

The PHONE and PCBEEP pins have been moved to different locations on the device

package.

•

Package: The default package for the WM9715L is a 7

×7mm leadless QFN package.

Audio mixing: The WM9715L handles all the audio functions of a smartphone, including

audio playback, voice recording, phone calls, phone call recording, ring tones, as well as

simultaneous use of these features. The AC’97 mixer architecture does not fully support

this. The WM9715L therefore uses a modified AC’97 mixer architecture with three

separate mixers.

•

Tone Control, Bass Boost and 3D Enhancement: These functions are implemented in

the digital domain and therefore affect only signals being played through the audio

DACs, not all output signals as stipulated in AC’97.

Some other functions are additional to AC’97:

•

On-chip BTL loudspeaker driver

•

On-chip BTL driver for ear speaker (phone receiver)

•

Auxiliary mono DAC for ring tones, system alerts etc.

•

Touchpanel controller

•

Auxiliary ADC Inputs

•

2 Analogue Comparators for Battery Alarm

•

Programmable Filter Characteristics for Tone Control and 3D Enhancement

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