WM9713 datasheet(14/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

DEVICE DESCRIPTION

INTRODUCTION

The WM9713L is a largely pin compatible upgrade to WM9712, with a PCM voice codec added. This

codec is interfaced via a PCM type audio interface which makes use of GPIO pins for connection.

It is designed to meet the mixed-signal requirements of portable and wireless smartphone systems. It

includes audio recording and playback, touchpanel digitisation, battery monitoring, auxiliary ADC and

GPIO functions, all controlled through a single 5-wire AC-Link interface. Additionally, PCM voice

codec functions are supported through provision of an additional voice DAC and a PCM audio serial

interface.

A PLL is included to allow unrelated reference clocks to be used for generation of the AC link system

clock. Typically 13MHz or 2.048MHz references might be used as a reference.

SOFTWARE SUPPORT

The basic audio features of the WM9713L 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 WM9713L uses an AC’97 interface to communicate with a microprocessor or controller. The

audio and GPIO 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 WM9713L is a 7

×7mm leadless QFN

package.

•

Audio mixing: The WM9713L 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 WM9713L 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 for mono or stereo speakers

•

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

•

PCM interface to additional Voice DAC and existing audio ADCs

•

PLL to create AC’97 system clock from unrelated reference clock input

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