WM8802 Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8802

Digital Audio Interface Transceiver

Wolfson Microelectronics plc 

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WM8802

CHIP ADDRESS SETTINGS (EMPHA/UO, AUDIO /VO)

The WM8802 comes with a function to set a unique chip address to allow the use of several

WM8802 on the same micro-controller bus.

A 10kΩ pull-down or pull-up resistor is used to set EMPHA/UO and AUDIO /VO as the chip address

settings. This allows up to set 4 chip addresses.

Chip addresses in the micro-controller interface can be set with CAL and CAU provided that they are

first two bits on the LSB side. CAL and CAU corresponds to the lower and higher chip address

respectively.

Address writing to a particular device is enabled by making the chip address setting, using

EMPHA/UO and AUDIO /VO, the same as the chip addresses sent from the micro-controller.

The chip address setting must be performed even when using only one WM8802 in the system. The

chip address is undefined and control from the micro-controller cannot be performed if the chip

address setting is not performed. While XMODE is Low and the micro-controller is not used the state

of the chip address setting pin is undefined,. Be sure to connect either A pull-down resistor or a pull-

up resistor should be connected to EMPHA/UO and AUDIO /VO.

AUDIO /VO

EMPHA/UO

Pull-down

Pull-down

Pull-down

Pull-up

Pull-up

Pull-down

Pull-up

Pull-up

Table 2 Chipset Address Settings

CAU

0

0

1

1

CAL

0

1

0

1

WM8802

EMPH/UO

AUDIO/VO

CKST

INT

Pull-up 10kΩ

External

Circuit

Pull-down 10kΩ

Figure 4 Function Setting Input Pin Setting Example

Notes:

1. Chip address setting

=> CAL = CAU = 0

2. Demodulation function master or slave setting

=> Master

3. Modulation function or general purpose I/O port switch => General purpose I/O port

function

w

PP Rev 1.1 April 2004

11

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