WM8955 Evaluation Board User Handbook WM8955 stereo with portable

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WM8955 Evaluation Board User Handbook WM8955 stereo with portable

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WM8955-EV1M
WM8955 Evaluation Board User Handbook
WM8955 stereo with portable audio applications. This evaluation platform documentation should used conjunction with latest version WM8955 datasheet. datasheet gives device functionality information well timing data format requirements. This evaluation platform been designed allow user ease give optimum performance device measurement well providing user with ability listen excellent audio quality offered WM8955.
GETTING STARTED
PACKING LIST
WM8955 Evaluation contains: WM8955-EV1B Evaluation Board (Silkscreen marked WM8750) WM8955-EV1S 3.5" floppy disks containing control software This manual WM8955-EV1M
CUSTOMER REQUIREMENTS
Minimum customer requirements are: D.C. Power supply D.C. Power supply +1.8V +3.6V printer cable (for software control)
Minimum spec requirements are: Win95/98/NT/2000/XP Processor
Signal Path Requires: Digital coaxial optical data source active stereo speakers
Analogue Signal Path Requires: Analogue coaxial 3.5mm jack plug signal source active stereo speakers
WOLFSON MICROELECTRONICS www.wolfsonmicro.com
September 2003,
Copyright 2003 Wolfson Microelectronics
WM8955-EV1M EVALUATION BOARD OPERATION
POWER SUPPLIES
Using appropriate power leads with connectors, power supplies should connected described Table
REF-DES
SOCKET NAME DBVDD AVDD DCVDD HPVDD DGND AGND
SUPPLY +1.8V +3.6V +1.8V +3.6V +1.42V +3.6V +1.8V +3.6V
Table Power Supply Connections DGND AGND connections connected common supply with reduction performance. reduce supply connections that need attached EVB, sites populated with resistors shorting AVDD, HPVDD DBVDD. this configuration recommended that supply only attached AVDD. separate supplies required resistors should removed from sites Note: Refer WM8955 datasheet limitations individual supply voltages. Important: Exceeding recommended maximum voltage damage components. Under voltage cause improper operation some components.
BOARD FUNCTIONALITY
There three options inputting digital data into WM8955 evaluation board. There coaxial input (J19) standard phono connector optical input (U3) standard optical receiver module. direct digital input also available side header (H1). analogue input signals applied evaluation board phono connectors (RLINE_IN1), (LLINE_IN1), (RLINE_IN2) (LLINE_IN2). analogue outputs board phono connectors (ROUT1), (LOUT1), (LOUT2), (ROUT2), (MONO OUT) (OUT3). There also analogue output 3.5mm jack socket (HP_OUT). WM8955 device pins accessible easy measurement headers (J13, J15, J21) running each side device. Level-shift (U4) used shift fixed digital input from CS8427 (U5) down same level DBVDD.
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WM8955-EV1M
BOARD INPUT
REF-DES SOCKET NAME SPDIF_IN SIGNAL Digital (AES/EBU, UEC958, S/PDIF, EIAJ CP340/1201) signal. Digital (AES/EBU, UEC958, S/PDIF, EIAJ CP340/1201) optical signal.
OPTICAL_IN
Table Digital Inputs REF-DES SOCKET NAME RLINE_IN1 LLINE_IN1 RLINE_IN2 LLINE_IN2 SIGNAL Analogue signal Analogue signal Analogue signal Analogue signal
Analogue signals applied these connectors coupled before being input WM8955. Table Analogue Inputs Note: When used Master Mode, SPDIF signal must still applied phono connector J19. This input signal used allow correct operation CS8427 well being used generate MCLK WM8955.
BOARD OUTPUT
REF-DES Table Analogue Outputs SOCKET NAME ROUT1 LOUT1 ROUT2 LOUT2 MONO OUT3 HP_OUT SIGNAL Line/Headphone Output Line/Headphone Output Speaker Output Speaker Output Mono Output ROUT1/VREF/MONO Headphone Output
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WM8955-EV1M
INTERFACES
Figure Interfaces
HEADERS
9/10 11/12 13/14 15/16 SIGNAL MCLK DACDAT DACLRC BCLK SIGNAL DACLRC_OUT
WM8955
NAME MCLK DCVDD DBVDD DGND BCLK DACDAT DACLRC CLKOUT
OPEN
WM8955
NAME HPVDD AVDD AGND VREF VMID HPDETECT
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WM8955-EV1M
Table Headers WM8955 NAME PLLGND MONOOUT OUT3 ROUT1 LOUT1 HPGND ROUT2 LOUT2 WM8955 NAME MONOIN MONOIN LINEINR LINEINL MODE SDIN SCLK
LINKS, JUMPERS SWITCHES
LINKS JUMPERS (BCLK) (DACLRC) J32, J33, (external speaker connection) (external speaker connection) (CLKOUT) Table Links LINK/JUMPER STATUS Pins SHORT Pins SHORT OPEN SHORT OPEN SHORT OPEN SHORT DESCRIPTION Connects OUT3 output reference Connects output reference [default setting] Master mode Slave mode [default setting] Master mode Slave mode [default setting] signals coupled [default setting] signals coupled AGND Pin2 speaker connection AGND Pin2 speaker connection Clock output
SWITCHES
SWITCH STATUS
DESCRIPTION After input data format change been made using SW3, CS8427 will only latch settings after been pressed released. DATA FORMAT Compatible [default setting] 24-bit Right Justified Left Justified
(DATA FORMAT)
(Software Control)
Pins SHORT Pins SHORT Pins SHORT Pins SHORT
3-wire (SPI) Control Mode [default setting] 2-wire Control Mode
J27, (R/LOUT Select)
Output Select (3.5mm Jack Socket) Line Output Select (Phono Socket) [default setting]
Table Switches
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WM8955-EV1M WM8955 OPERATION
SOFTWARE CONTROL
There possible serial software control modes that selected operate WM8955. standard user interface 3-wire solution with second option being 2-wire solution.
3-WIRE MODE
operate WM8955 (3-wire) mode, jumper switch must that pins SHORT. 3-wire serial interface then becomes active pins 30(CSB), 31(SDIN) 32(SCLK). serial interface board connected printer port other standard parallel port. port used selected through software provided. software supplied with this gives user access possible features provided WM8955. 3-wire latch, data clock lines also connected board test points (CSB), (SDIN) (SCLK). Please refer WM8955 datasheet full details serial interface timing register features.
SCLK
SDIN
Figure 3-Wire Serial Interface
2-WIRE MODE
operate WM8955 2-wire mode, jumper switch must that pins SHORT. 2-wire serial interface becomes active pins 31(SDIN) 32(SCLK). serial interface board connected printer port other standard parallel port. Note: bi-directional parallel port required 2-wire operation1. 2-wire data clock lines also connected board test points (SDIN) (SCLK). When used 2-wire mode, WM8955 possible addresses (0011010 [0x34h] 0011011 [0x36h]) that selectable pulling high. connecting probe Test Points must noted that line pulled high WM8955 evaluation board selecting address 0011011. must pulled driven through software writes address 0011010 used done WM8955-EV1S software provided).
SDIN
ADDR
DATA B15-8
DATA B7-0
SCLK
START
STOP
Figure 2-Wire Serial Interface Note: 2-wire mode reporting expected then most likely cause that parallel port being used bi-directional. most PC's, parallel port configured BIOS settings during initial power
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WM8955-EV1M
REGISTER (00h) (01h) (02h) (03h) (04h) (05h) (06h) (07h) (08h) (09h) (0Ah) (0Bh) (0Ch) (0Dh) (0Fh) (17h) (18h) (19h) (1Ah) (1Bh) (22h) (23h) (24h) (25h) (26h) (27h) (28h) (29h) (2Ah) (2Bh) (2Ch) (2Dh) (2Eh) (3Bh) ADDRESS (Bit Reserved Reserved Reserved Reserved 1000 Reserved 1010 1011 1100 1101 1111 Reserved 10111 11000 11001 11010 11011 Reserved 100010 100011 100100 100101 100110 100111 101000 101001 101010 10111 11000 11001 11010 11011 TSDEN OUT3SW[1:0] VMIDSEL[1:0] DACL LD2LO RD2LO LD2RO RD2RO LD2MO RD2MO LO2VU RO2VU MCLKSEL DACR LI2LO MI2LO MI2RO RI2RO LI2MO RI2MO LO2ZC RO2ZC MOZC CLKOUTEN CLKOUTSEL PLLOUTDIV2 PLL_RB [17:9] [8:0] VSEL[1:0] HPSWEN VREF LOUT1 VROI Bit[8] LO1VU RO1VU CLKOUTDIV2 LDVU RDVU Bit[7] LO1ZC RO1ZC BCLKINV BCLKDIV2 CLKDIV2 LRSWAP SR[4:0] LDACVOL[7:0] RDACVOL[7:0] BASS[3:0] TRBL[3:0] DACMU WL[1:0] Bit[6] Bit[5] Bit[4] Bit[3] LOUT1VOL[6:0] ROUT1VOL[6:0] DEEMPH[1:0] FORMAT[1:0] Bit[2] Bit[1] Bit[0]
writing 000000000 this register resets registers their default state DMONOMIX[1:0] HPSWPOL ROUT1 LI2LOVOL[2:0] MI2LOVOL[2:0] MI2ROVOL[2:0] RI2ROVOL[2:0] LI2MOVOL[2:0] RI2MOVOL[2:0] ROUT2INV LOUT2 HPZC ROUT2 LOUT2VOL[6:0] ROUT2VOL[6:0] MOUTVOL[6:0] PLLEN [21:18] MONO DACINV OUT3 TOEN DACOSR DIGENB DMEN
Table Mapping Program Registers Please refer WM8955 datasheet full details serial interface timing register features.
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WM8955-EV1M SERIAL INTERFACE SOFTWARE DESCRIPTION
SOFTWARE INSTALLATION
There floppy disks supplied with this evaluation kit. install software: Insert disk Select `Start' button Windows task `Run.' option. Type "A:\set-up" then press Follow on-screen instructions.
SOFTWARE OPERATION
many features offered WM8955 software been split into different panels. This eases complexity software making each panel less busy, panels have also been grouped that makes simple control each section device. main menu panel shown Figure used call other panels well offering number pull-down menus.
Figure Software Menu Panel
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WM8955-EV1M
`Submit All' button will submit values every register WM8955. `Reset' button writes reset register (R15) does reset control panel values. previous values resubmitted then `Submit All' button should pressed, user would like start afresh then `Reset Software Panel Settings' button should also pressed. Pressing this button does write device, only resets panel settings their default state. Left clicking Wolfson logo will open default browser Wolfson Microelectronics website (`www.wolfsonmicro.com'). Line setup buttons have also been provided quick start approach. Pressing either these buttons will power Line signal paths known state described following pages. Important: must noted that CS8427 SPDIF decoder will only work rate 256fs. This will limit sample rates that using WM8955 unless external source used supplying signals directly relevant pins header
SUBMIT SETUP
pressing `DAC Setup' button, software writes device setting SPDIF_In through L/ROUT1 L/ROUT2 outputs; active 24-bit, input data format. Table lists required board settings allow this signal path become active. This ease initial WM8955 until user becomes familiar with both device software operation.
DGND
DBVDD +1.8V +3.6V
AVDD +1.8V +3.6V
AGND
PARALLEL PORT
RLINE
SPDIF_
Figure Recommended Setup
MONO
ROUT2 ROUT1
OPEN
DCVDD +1.42V +3.6V
LLINE
RLINE
LLINE
LOUT2
LOUT1
OUT3
HPVDD +1.8V +3.6V
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WM8955-EV1M
LINKS JUMPERS (BCLK) (DACLRC) J32, J33, J27, Pins SHORT Pins SHORT LINK/JUMPER STATUS jumpers place Pins SHORT SHORT SHORT OPEN DESCRIPTION clocks data input Connects output reference Slave mode Slave mode signals coupled DATA FORMAT Compatible
3-wire (SPI) Control Mode Line Output Select (Phono Socket)
Table Setup Jumper Settings (Slave Mode)
LINE SUBMIT SETUP
pressing `Line Setup' button, software writes device setting L/RLINE_IN1 through analogue path L/ROUT1 L/ROUT2 outputs. with setups previously described, this ease initial WM8955 until user becomes familiar with both device software operation.
DGND
DBVDD +1.8V +3.6V
AVDD +1.8V +3.6V
AGND
PARALLEL PORT
RLINE
SPDIF_
Figure Recommended Line Setup
SPDIF_
OPEN
DCVDD +1.42V +3.6V
LLINE
RLINE
LLINE
ROUT2 ROUT1 LOUT2 LOUT1 MONO OUT3
HPVDD +1.8V +3.6V
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WM8955-EV1M
LINKS JUMPERS (BCLK) (DACLRC) J32, J33, J27, Pins SHORT Pins SHORT LINK/JUMPER STATUS jumpers place SHORT SHORT OPEN Slave mode Slave mode signals coupled DATA FORMAT Compatible DESCRIPTION clocks data input
3-wire (SPI) Control Mode Line Output Select (Phono Socket)
Table Line Setup Jumper Setup (Slave Mode)
POWER DOWN
Figure Power Control Power Down Interface Control panel used enable/disable various sections WM8955. also used audio interface required data format. Pressing `Power Submit' button will cause settings shown this panel written WM8955. full device register write sent.
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WM8955-EV1M
VOLUME CONTROL
Figure Volume Control Volume Control panel used control both analogue digital volume settings WM8955. volume sliders update `real' time (i.e. `Volume Submit' button does have pressed update output volume level) will only have effect output Volume Update bits set. Once changes made Volume Update bits, `Volume Submit' button must left clicked change take effect. Pressing `Volume Submit' button will cause settings shown this panel written WM8955. full device register write sent.
MIXER CONTROL
Figure Mixer Control Mixer Control panel used control many signal mixing options offered WM8955. volume sliders update `real' time (i.e. `Mixer Submit' button does have pressed update mixer volume level). Pressing `Mixer Submit' button will cause settings shown this panel written WM8955. full device register write sent.
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WM8955-EV1M
TONE CONTROL
Figure Tone Control Tone Control panel used control Bass Treble options offered WM8955. sliders update `real' time (i.e. `Tone Submit' button does have pressed update relevant tone slider level). Pressing `Tone Submit' button will cause settings shown this panel written WM8955. full device register write sent. Pressing `Tone Preset button sets Bass Treble levels maximum (i.e. +9dB linear Bass +9dB Treble). These settings automatically submitted WM8955. Pressing `Tone Preset button sets Bass Treble levels mid-level (i.e. linear Bass Treble). These settings automatically submitted WM8955. Pressing `Tone Default' button sets Bass Treble levels their default states. These settings automatically submitted WM8955. purpose Preset button allow effects Bass Treble functions easily tested.
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WM8955-EV1M
CONTROL
Figure Control control panel allows access control options offered WM8955. start PLL, must enabled ResetB switch must `PLL Running'. required sources additional setting then set. values should recommended WM8955 datasheet. clock measured CONNEX connector setting path correctly using Control panel. Once WM8955 default settings changed control panel, relevant section highlighted blue show section where setting changed. highlight around relevant section also purpose letting user know that they have submitted required changes WM8955. After Submit from relevant panel main panel Submit, sections will default back their original 'panel grey' colour. Submit button also becomes inactive until another change made register settings. Refer Appendix Section this user manual additional evaluation board setup details.
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WM8955-EV1M SCHEMATIC LAYOUT
Figure Functional Diagram
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WM8955-EV1M
Figure Digital Input
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Figure Software Control
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WM8955-EV1M
Figure Level Shift
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WM8955-EV1M
Figure Analogue Input
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WM8955-EV1M
Figure WM8955
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WM8955-EV1M
Figure Analogue Output
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WM8955-EV1M
Figure Power
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WM8955-EV1M WM8955-EV1B LAYOUT
Figure Layer Silkscreen
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WM8955-EV1M
Figure Layer
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WM8955-EV1M
Figure Bottom Layer
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WM8955-EV1M
Figure Bottom Layer Silkscreen
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WM8955-EV1M WM8955-EV1B BILL MATERIAL
Description 74ALVC164245 Dual Supply Transceiver 10uF pitch Oscon Through Hole Cap. pitch Oscon Through Hole Cap. 220uF pitch Oscon Through Hole Cap. 0.01uF 0805 Ceramic Capacitor 0.1uF 0805 Ceramic Capacitor 0805 Ceramic Capacitor 0805 Ceramic Capacitor 220pF 0805 Ceramic Capacitor Unpop 0805 Ceramic Capacitor site 4.7nF 1206 Ceramic Capacitor 3.5mm Jack Socket 6.5mm Centre Height 2.54mm pitch Header VERTICAL 2.54mm pitch Header VERTICAL 2.54mm pitch Header VERTICAL 36-way Centronics/IEE488 mountable Connector JSK9-16-G0 Jumper Switch 0.1" Center-off VERTICAL Non-Insulated Panel Socket Phono Socket mount BLACK Phono Socket mount Phono Socket mount WHITE Phono Socket mount YELLOW Connector Mount CS8427 96KHz Audio Transceiver DS1813 active Power-On-Reset chip 1206 Resistor 1210 Inductor site 3.3uH 1210 Surface Mount Inductor '1210A series' 47uH 1210 Surface Mount Inductor series' Unpop 1210 Surface Mount Inductor site HSMY-C670 0805 Chip YELLOW Header 0.1" VERTICAL 0805 chip resistor 0.1W 100K 0805 chip resistor 0.1W 100R 0805 chip resistor 0.1W 0805 chip resistor 0.1W 0805 chip resistor 0.1W 0805 chip resistor 0.1W 330R 0805 chip resistor 0.1W 0805 chip resistor 0.1W 0805 chip resistor 0.1W 0805 chip resistor 0.1W 620R 0805 chip resistor 0.1W 680R 0805 chip resistor 0.1W 0805 chip resistor 0.125W REF-DES
C5-6 C48- C70-71 C65-66
C2-3 C14-16 C30-33 C53-54 C58-60 C72-75 C76-77 C81-87 C10-12 J27-28 SW1-2 SW4-5 SW7-9 J1-2 J4-5 J39-40 J42-43 J44-45 L1-5 J23-25 J31-35 J37-38 R60-62 R58-59 R63-64 R71-72 R56-57 R65-66 R22-32 R67-70 R11-13
R16-17 R40-41 R73-
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WM8955-EV1M
Description Unpopulated 0805 resistor site Switch 6-Way Rocker B3F1000 SPNO mount switch 1.32mm Test Terminal BLACK 1.32mm Test Terminal TORX176 Digirtal Audio Optical Receiver Ratio 96KHz SPDIF Digital Audio transformer SOIC TN0200T Channel MOSFET SOT23 WM8955L Stereo with Portable Audio REF-DES R37-39 R44-45 R53-54 R76-77 TP5-9 TP2-4 TP10 Q1-3
Table WM8955-EV1M Bill Materials Note: audio transformer used this board manufactured Scientific Conversion Inc. (www.scientificonversion.com).
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WM8955-EV1M APPENDIX EXTERNAL CONNECTION WM8955-EV1B
WM8955-EV1B evaluation board been designed allow easily connected external platform with error free operation. following information provided ease connection process ensure that signals sent received WM8955-EV1B reliable correct voltage levels.
AUDIO INTERFACE CONNECTIONS
recommended that twisted pair (signal twisted with GND) shielded wires used make audio interface connections between WM8955-EV1B platforms. This ensure that interference noise picked clocks data lines, thus reducing performance reliability. When WM8955 Slave Mode, jumpers header should removed, disconnecting digital input section evaluation board. audio interface timing data signals from platform should then connected shown Figure signals should connected header strips running each side device. Connecting signals output side level-shift (U4) will cause drive contention between could result damage either both devices. most cases, supplies will around power portable applications. inputs level-shift (74ALVC164245) have threshold (i.e. Logic High +2V(min); Logic +0.8V(max)) input current requirements (i.e. 15uA max) allowing most DSP's connect directly.
MCLK DACDAT DACLRC BCLK
Figure Connections from Platform digital inputs WM8955 have CMOS threshold (i.e. Logic High (min) DBVDDx0.7; Logic (max) DBVDDx0.3). These directly level shift outputs. When WM8955 Master mode, jumpers header should removed, disconnecting digital input section evaluation board. external MCLK signal being used (i.e. supplied DSP) then platform should connected shown Figure signal should connected header strip running side device. Connecting signal output side level-shift (U4) will cause drive contention between could result damage either both devices. most cases, supplies will around power portable applications. inputs level-shift (74ALVC164245) have threshold (i.e. Logic High +2V(min); Logic +0.8V(max)) input current requirements (i.e. 15uA max) allowing most DSPs connect directly.
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WM8955-EV1M
MCLK
Figure Timing Connections from Platform digital inputs WM8955 have CMOS threshold (i.e. Logic High (min) DBVDDx0.7; Logic (max) DBVDDx0.3). These directly level shift outputs.
SOFTWARE INTERFACE
When using WM8955-EV1B evaluation board with platform, registers using supplied software with parallel port cable shown Figure being used write WM8955 registers well supplying/receiving audio interface timing data signals, then recommended that twisted pair shielded wires used connect platform WM8955-EV1B. supplies same voltage DBVDD supplies WM8955; direct connection made (CSB), (SDIN) (SCLK) header strip 3-wire software mode shown Figure running higher voltage (e.g. +5V) than WM8955, then signals from platform should connected test points (CSB), (SDIN) (SCLK). Connecting higher voltage signals from test points will level shift them through transistors down same level DBVDD supply shown Figure This will ensure that WM8955 input CMOS thresholds (i.e. Logic High (min) DBVDDx0.7; Logic (max) DBVDDx0.3) damage done device. same connections apply controlling WM8955 2-wire software mode (i.e. only (SDIN) (SCLK) header strip used). (CSB) pulled board device address 0011010 [0x34h] required pulled high address 0011011 [0x36h] required.
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WM8955-EV1M
CONNECTION DIAGRAMS
Software Control
WM8955-EV1B Platform Audio Interface
Figure Connection with Control using Wolfson Software
Software Control
WM8955-EV1B
Platform
Audio Interface
Figure Full Control with Equal Supplies WM8955
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WM8955-EV1M
Software Control
Test Points Transistors
WM8955-EV1B Platform Audio Interface
Figure Full Control with Higher Supply than WM8955
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WM8955-EV1M ADDITIONAL WM8955-EV1B SETUP RECOMMENDATIONS
CONNECTION MONO SPEAKER
WM8955-EV1 drive mono speaker from R/LOUT2 outputs. Figure shows setup required signal applied signal path driven speaker attached phono connectors J42. stated Table speaker also attached jumpers J38.
DGND
DBVDD +1.8V +3.6V
AVDD +1.8V +3.6V
AGND
PARALLEL PORT
RLINE
SPDIF_
Figure Recommended Mono Speaker Connection Setup Note: LOUT2 output; ROUT2 output.
MONO
ROUT2 ROUT1
SPDIF_
OPEN
DCVDD +1.42V +3.6V
LLINE
RLINE
LLINE
LOUT2
LOUT1
OUT3
Output
Output
HPVDD +1.8V +3.6V
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WM8955-EV1M
LINKS JUMPERS (BCLK) (DACLRC) J27, Pins SHORT Pins SHORT LINK/JUMPER STATUS jumpers place. Pins SHORT SHORT SHORT OPEN SHORT DESCRIPTION clocks data input Connects output reference Slave mode Slave mode signals coupled signals coupled DATA FORMAT Compatible
3-wire (SPI) Control Mode Line Output Select (Phono Socket)
Table Mono Speaker Setup Jumper Settings (Slave Mode)
SOFTWARE SETUP
Press `DAC Setup' button. Open Mixer Control panel. `ROUT2 Invert' switch Signal Inverted followed `Mixer Submit' button.
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WM8955-EV1M
HEADPHONE AUTO DETECT FUNCTION
DGND
DBVDD +1.8V +3.6V
AVDD +1.8V +3.6V
AGND
PARALLEL PORT
RLINE
SPDIF_
Figure Detect Function Setup features WM8955 auto detect function. This enabled WM8955-EV1B making following software settings. Press `DAC Setup' button. Open Tone Control panel `Headphone Switch' Enable. Press Tone Submit button.
headphone auto detect function should active. With headphone connected 3.5mm jack socket (J46) audio should output from speakers connected R/LOUT2. When headphone plugged into 3.5mm jack socket (J46), audio should stop being output from speakers connected R/LOUT2 only output headphone. Refer WM8955 datasheet further details this, other functions offered WM8955.
MONO
ROUT2 ROUT1
SPDIF_
OPEN
DCVDD +1.42V +3.6V
LLINE
RLINE
LLINE
LOUT2
LOUT1
OUT3
HPVDD +1.8V +3.6V
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WM8955-EV1M EVALUATION SUPPORT
this evaluation help become familiar with functionality performance WM8955 DAC. require more information require technical support please contact Wolfson Microelectronics Applications group through following channels: Email: Telephone Apps: Fax: Mail: apps@wolfsonmicro.com (+44) 7070 (+44) 7001 Applications Department address last page.
contact your local Wolfson representative. Additional information made available from time time site http://www.wolfsonmicro.com
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WM8955-EV1M IMPORTANT NOTICE
Wolfson Microelectronics (WM) reserve right make changes their products discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability.
warrants performance products specifications applicable time sale accordance with WM's standard warranty. Testing other quality control techniques utilised extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements.
order minimise risks associated with customer applications, adequate design operating safeguards must used customer minimise inherent procedural hazards. Wolfson products authorised critical components life support devices systems without express written approval officer company. Life support devices systems devices systems that intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided, reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
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Reproduction information from site datasheets permissible only reproduction without alteration accompanied associated warranties, conditions, limitations notices. Representation reproduction this information with alteration voids warranties provided associated product service, unfair deceptive business practice, responsible liable such use.
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Wolfson Microelectronics Bernard Terrace Edinburgh United Kingdom
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WM8955 Evaluation Board User Handbook WM8955 stereo with portable

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