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WM8816-MICRO-EV1M PDF даташит

Спецификация WM8816-MICRO-EV1M изготовлена ​​​​«Wolfson Microelectronics» и имеет функцию, называемую «Micro-Controller Board User Handbook».

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Номер произв WM8816-MICRO-EV1M
Описание Micro-Controller Board User Handbook
Производители Wolfson Microelectronics
логотип Wolfson Microelectronics логотип 

12 Pages
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WM8816-MICRO-EV1M Даташит, Описание, Даташиты
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WM8816-MICRO- EV1M
WM8816 Micro-Controller Board User Handbook
INTRODUCTION
The WM8816 Micro-Controller Board is a user-friendly interface for the WM8816 Stereo Volume
Control Evaluation Platform.
By connecting the WM8816 Micro-Controller Board directly to the 10 pin header of the WM8816
evaluation board users can quickly and easily generate the digital signals required to demonstrate
the volume, balance and peak level detection features of the WM8816 volume control chip.
The latest revision of the datasheet offers device functionality information as well as timing and data
format requirements.
GETTING STARTED
PACKING LIST
The WM8816 Micro-Controller Board Kit contains:
1 WM8816_MICRO_EV1B Micro-Controller Board
This manual -1 WM8816_MICRO_EV1M
10 Pin Ribbon Cable For Connection To The WM8816_EV1B Board
CUSTOMER REQUIREMENTS
Minimum customer requirements are:
A 9 Volt D.C. Bench Top Power Supply.
A WM8816_EV1B Board
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
December 2002, Rev 1.1
Copyright 2002 Wolfson Microelectronics plc









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WM8816-MICRO-EV1M Даташит, Описание, Даташиты
BLOCK DIAGRAM
WM8816-MICRO-EV1M
Wolfson Microelectronics Ltd. – WM8816_Micro_EV1_REV2
SW1 Power
J3
D10
U2
U8 DISPLAY MODE
D7 Volume
D6 Balance
D5 Peak Ref.
PIC 16F874
Micro-Controller
U7
J1
J4 J2
J5
Front Rear Centre / LFE
D8 Mute
PEAK STAT. REG
D4 D2
Left O/L Right O/L
D3 D1
Left OK Right OK
6-CHANNEL
D13 Front
D12 Rear
D11 Centre
D15 LFE
K1
Key
10 9
87
65
43
21
Figure 1 WM8816 Micro-Controller Board Block Diagram
POWER SUPPLIES
A 9 Volt power supply, with a positive centre pin miniature power jack, should be connected to the
power input connector (J3). This 9 Volt supply is regulated onboard to the 5 Volt supply required by
the PIC Micro-Controller (U7).
For normal operation the power on/off switch (SW1) should be in the right hand (on) position,
illuminating the “Power On” LED (D10).
BOARD FUNCTIONALITY
Header J5 of the WM8816 Micro-Controller Board should be connected directly to the 10-pin header
of the WM8816 Evaluation Board using the ribbon cable provided.
The keypad (K1) allows for the input of Volume, Balance, and Peak Level information which is then
sent, via the ribbon cable, to the Evaluation Board. A PIC Micro-Controller is used to convert user
inputs, from the keypad, into the appropriate digital format (as described in the WM8816 data sheet).
Components U2 & U8 form a four-digit display, which is used to display the current Volume, Balance,
and Peak Reference Register settings. LED’s D5, D6 and D7 indicate which of the three display
modes is being currently displayed.
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Rev 1.1, December 2002
2









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WM8816-MICRO-EV1M Даташит, Описание, Даташиты
KEYPAD LAYOUT
.
WM8816-MICRO-EV1M
VOL.
BAL.
CENTRE
BAL.
VOL.
MUTE
DISP.
FRONT
BAL.
REAR
CENTRE
/LFE
P.REF P.STAT
Figure 2 Keypad Layout
The following sections describe the function of each of these keys.
SETTING THE VOLUME
The volume is set using the up and down arrow keys marked “Vol.”. The up arrow increments the
volume in 0.5dB steps whilst the down arrow decrements the volume in 0.5dB steps. The applied
gain can be varied between +15.5dB and –111.5dB. Holding down the keys causes the output
volume level to be changed faster.
When either of the “Vol.” keys are pressed, LED (D7) is illuminated, and the output display (U2 & U8)
is updated to show the latest volume, in dB.
ADJUSTING THE BALANCE SETTING
The left and right arrow keys, marked “Bal.”, are used to adjust the relative loudness of each channel.
Attenuating the opposite channel makes one channel (apparently) louder.
The left arrow shifts the balance towards the left channel in 0.5 dB steps. Similarly the right arrow
key shifts the balance towards the right channel in 0.5dB steps. Pressing the “Centre Bal.” key
equalises the volume emitting from both channels.
When any of the balance keys is pressed LED (D6) is illuminated and the output display (U2 & U8) is
updated to indicate the latest setting. Balance settings are displayed as a 3 digit number preceded
by an ‘L’ or ‘R’. The letter ‘L’ indicates that the left channel is the loudest channel, whilst the letter ‘R’
indicates that the right channel is the loudest channel. The following number indicates how many
dB’s the opposite channel has been attenuated to achieve the balance effect. For example a display
of R45.5 indicates that the balance is currently set towards the right channel – and that to achieve
this the left channel has been attenuated by 45.5dB.
Holding down either of the left / right balance keys causes the settings to change much faster. The
maximum volume difference that can be set between channels, in the current board implementation,
is 63.5 dB.
MUTE
Pressing the key marked MUTE causes the mute option to be toggled between on and off. LED (D8)
is illuminated when the WM8816 is muted.
The WM8816 Micro-Controller Board initiates what the data sheet calls a “Software Mute” - since it is
achieved by writing the code for –112dB to the digital serial interface of the WM8816 chip.
It is still possible to adjust the volume, balance and peak level detection settings whilst the device is
muted. However it should be noted that these settings will only come into effect once the device is
un-muted.
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Rev 1.1, December 2002
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Номер в каталогеОписаниеПроизводители
WM8816-MICRO-EV1MMicro-Controller Board User HandbookWolfson Microelectronics
Wolfson Microelectronics

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