WM9712LSEFL/V datasheet, PDF - EEWORLD Datasheet

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WM9712LSEFL/V: DescriptionAC97 Audio and Touchpanel CODEC; File Size699KB，78 Pages; ManufacturerWolfson Microelectronics plc (Cirrus Logic); Websitehttp://www.wolfson.co.uk

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WM9712LSEFL/V Overview

AC97 Audio and Touchpanel CODEC

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WM9712L

AC’97 Audio and Touchpanel CODEC

DESCRIPTION

The WM9712L is a highly integrated input / output device

designed for mobile computing and communications. The

device can connect directly to a 4-wire or 5-wire touchpanel,

mono or stereo microphones, stereo headphones and a

mono speaker, reducing total component count in the

system. Additionally, phone input and output pins are

provided for seamless integration with wireless

communication devices.

The WM9712L also offers up to four auxiliary ADC inputs

for analogue measurements such as temperature or light,

and five GPIO pins for interfacing to buttons or other digital

devices. To monitor the battery voltage in portable systems,

the WM9712L has two uncommitted comparator inputs.

All device functions are accessed and controlled through a

single AC-Link interface compliant with the AC’97 standard.

Additionally, the WM9712L can generate interrupts to

indicate pen down, pen up, availability of touchpanel data,

low battery, dead battery, and GPIO conditions.

The WM9712L operates at supply voltages from 1.8 to 3.6

Volts. Each section of the chip can be powered down under

software control to save power. The device is available in a

small leadless 7x7mm QFN package, ideal for use in hand-

held portable systems, or in the industry standard 48-pin

TQFP package.

FEATURES

•

AC’97 Rev 2.2 compatible stereo codec

- DAC SNR 94dB, THD –87dB

- ADC SNR 92dB, THD –87dB

- Variable Rate Audio, supports all WinCE sample rates

- Tone Control, Bass Boost and 3D Enhancement

•

On-chip 45mW headphone driver

•

On-chip 400mW mono speaker driver

•

Stereo, mono or differential microphone input

- Automatic Level Control (ALC)

•

Auxiliary mono DAC (ring tone or DC level generation)

•

Seamless interface to wireless chipset

•

Resistive touchpanel interface

- Supports 4-wire and 5-wire panels

- 12-bit resolution, INL

±2

LSBs (<0.5 pixels)

- X, Y and touch-pressure (Z) measurement

- Pen-down detection supported in Sleep Mode

•

Up to 5 GPIO pins

•

2 comparator inputs for battery monitoring

•

Up to 4 auxiliary ADC inputs

•

1.8V to 3.6V supplies

•

7x7mm QFN or 48-pin TQFP package options

APPLICATIONS

•

Personal Digital Assistants (PDA)

•

Smartphones

•

Handheld and Tablet Computers

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

www.wolfsonmicro.com

Production Data, December 2003, Rev 4.0

2003

Wolfson Microelectronics plc.

WM9712L

TABLE OF CONTENTS

Production Data

DESCRIPTION .......................................................................................................1

FEATURES.............................................................................................................1

APPLICATIONS .....................................................................................................1

BLOCK DIAGRAM .................................................................................................1

TABLE OF CONTENTS .........................................................................................2

PIN CONFIGURATION...........................................................................................4

ORDERING INFORMATION ..................................................................................4

PIN DESCRIPTION ................................................................................................5

ABSOLUTE MAXIMUM RATINGS.........................................................................6

RECOMMENDED OPERATING CONDITIONS .....................................................6

ELECTRICAL CHARACTERISTICS ......................................................................7

AUDIO OUTPUTS.......................................................................................................... 7

AUDIO INPUTS.............................................................................................................. 8

AUXILIARY MONO DAC (AUXDAC).............................................................................. 8

TOUCHPANEL AND AUXILIARY ADC .......................................................................... 9

COMPARATORS ........................................................................................................... 9

REFERENCE VOLTAGES ........................................................................................... 10

DIGITAL INTERFACE CHARACTERISTICS................................................................ 10

HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER ..................................... 11

POWER CONSUMPTION............................................................................................ 12

DEVICE DESCRIPTION.......................................................................................13

INTRODUCTION.......................................................................................................... 13

AUDIO PATHS OVERVIEW......................................................................................... 14

AUDIO INPUTS ....................................................................................................15

LINE INPUT ................................................................................................................. 15

MICROPHONE INPUT................................................................................................. 15

PHONE INPUT............................................................................................................. 17

PCBEEP INPUT ........................................................................................................... 18

AUDIO ADC..........................................................................................................19

RECORD SELECTOR ................................................................................................. 20

RECORD GAIN............................................................................................................ 21

AUTOMATIC LEVEL CONTROL.................................................................................. 22

AUDIO DACS .......................................................................................................25

STEREO DAC.............................................................................................................. 25

AUXILIARY DAC.......................................................................................................... 28

ANALOGUE AUDIO OUTPUTS ...........................................................................29

HEADPHONE OUTPUTS – HPOUTL AND HPOUTR.................................................. 29

EAR SPEAKER OUTPUT – OUT3............................................................................... 30

LOUDSPEAKER OUTPUTS – LOUT2 AND ROUT2.................................................... 31

PHONE OUTPUT (MONOOUT)................................................................................... 32

THERMAL SENSOR .................................................................................................... 32

JACK INSERTION AND AUTO-SWITCHING............................................................... 33

DIGITAL AUDIO (SPDIF) OUTPUT ............................................................................. 34

AUDIO MIXERS ........................................................................................................... 35

PD Rev 4.0 December 2003

Production Data

WM9712L

VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION ...............................37

TOUCHPANEL INTERFACE................................................................................38

PRINCIPLE OF OPERATION - FOUR-WIRE TOUCHPANEL ..................................... 38

PRINCIPLE OF OPERATION - FIVE-WIRE TOUCHPANEL........................................ 40

CONTROLLING THE TOUCHPANEL DIGITISER ....................................................... 42

AUXILIARY ADC INPUTS ....................................................................................47

BATTERY MEASUREMENT USING THE BMON/AUX3 PIN ....................................... 47

BATTERY ALARM AND ANALOGUE COMPARATORS ....................................48

GPIO AND INTERRUPT CONTROL ....................................................................51

AC97 DATA AND CONTROL INTERFACE .........................................................58

INTERFACE PROTOCOL............................................................................................ 58

INTERFACE TIMING ................................................................................................... 59

APPLICATIONS INFORMATION .........................................................................71

RECOMMENDED EXTERNAL COMPONENTS........................................................... 71

LINE OUTPUT ............................................................................................................. 72

AC-COUPLED HEADPHONE OUTPUT....................................................................... 73

DC COUPLED (CAPLESS) HEADPHONE OUTPUT ................................................... 73

BTL LOUDSPEAKER OUTPUT ................................................................................... 74

COMBINED HEADSET / BTL EAR SPEAKER............................................................. 74

COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER......................................... 74

JACK INSERT DETECTION ........................................................................................ 75

HOOKSWITCH DETECTION....................................................................................... 75

PACKAGE DRAWING - QFN ...............................................................................76

PACKAGE DRAWING – TQFP ............................................................................77

IMPORTANT NOTICE ..........................................................................................78

ADDRESS:................................................................................................................... 78

PD Rev 4.0 December 2003

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