WM8802 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8802

Digital Audio Interface Transceiver

Wolfson Microelectronics plc 

WM8802

DEVICE DESCRIPTION

INITIAL SYSTEM SETTINGS

SYSTEM RESET (XMODE)

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The system operates normally when XMODE is set to High after applying a supply voltage of 3.0V or

greater. Following power ON, the system is reset by setting XMODE to Low again.

A 10kΩ pull-down or pull-up resistor can be used to set EMPHA/UO, AUDIO /VO, CKST and

INT for the following:

• chip address

• demodulation function master or slave

• modulation function or general-purpose I/O function settings

If EMPHA/UO, AUDIO /VO, CKST , and INT are not pulled up or down, their state is undefined. A

pull-up or pull-down resistor should always be connected to these pins.

SETTING

Chip address

Demodulation function master or slave

Modulation function or general-

purpose I/O function

Table 1 Pin Names and Settings

PINS

EMPHA/UO, AUDIO /VO

CKST

INT

3.0V 3.3V

DVDD

Normal system operation range

Setting completed

XMODE

Set pin state

Undefined Setting input Output state Setting input Output state

state

state

Min 200 µs

Figure 3 Setting Timing Chart of Function Setting Input Pins

w

PP Rev 1.1 April 2004

10

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