WM8816-MICRO-EV1M データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8816-MICRO-EV1M

WM8816 Micro-Controller Board User Handbook

Wolfson Microelectronics plc 

BLOCK DIAGRAM

WM8816-MICRO-EV1M

Wolfson Microelectronics Ltd. – WM8816_Micro_EV1_REV2

U2

SW1 Power

J3

D10

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

8

7

6

5

4

3

2

1

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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