WM8523GEFLSLASHV datasheet(32/51 Pages) WOLFSON

32 / 51 page

WM8523

Production Data

PD, Rev 4.1, August 2011

HARDWARE CONTROL INTERFACE

The WM8523 can be controlled in hardware mode or in software modes. In hardware mode, the device

is configured according to logic levels applied to hardware pins.

Hardware control mode is selected by leaving CIFMODE pin open-circuit (high-impedance). When

hardware mode is selected, the associated multi-function control pins are defined as described in Table

22.

PIN NAME

PIN NUMBER

DESCRIPTION

TSSOP

QFN

ZFLAG

Zero Flag Output

0 = Normal operation

1 = Infinite zero detect is triggered or mute is applied

DEEMPH

De-emphasis Filter Select

0 = Filter disabled

1 = Filter enabled

AIFMODE0

AIFMODE1

AIFMODE0

FORMAT

24-bit Left Justified

24-bit I2S

16-bit Right Justified

24-bit Right Justified

AIFMODE1

MUTE

¯¯¯¯¯

Mute Control

0 = Mute

1 = Normal operation

CIFMODE

Control Interface Mode

0 = I2C Mode

1 = SPI Mode

Z = Hardware Mode

Table 22 Hardware Control Pin Configuration

DE-EMPHASIS

A digital de-emphasis filter may be applied to the DAC output when the sampling frequency is 44.1kHz.

Operation at 48kHz and 32kHz is also possible, but with an increase in the error from the ideal response.

Details of the de-emphasis filter characteristic for 32kHz, 44.1kHz and 48kHz can be seen in Figure 31 to

Figure 36.

MUTE

In hardware mode, the MUTE

¯ ¯ ¯ ¯ ¯ pin controls the DAC mute to both left and right channels. When the mute

is asserted a softmute is applied to ramp the signal down, with the ramp rate related to the sample rate

as defined in Table 15 on page 30. Once mute is achieved, the ZFLAG is asserted. When the mute is

de-asserted the signal returns to full scale in one step and the ZFLAG is de-asserted.

ZERO DETECT

The zero detect function in hardware mode will assert the ZFLAG pin high when 1024 zero count

samples are input to the digital audio interface. Additionally, the ZFLAG is asserted when the device is

muted using the MUTE

¯¯¯¯¯ pin and also until the device comes out of reset.

WM8523GEFL/V датащи(PDF) 32 Page - Wolfson Microelectronics plc

WM8523GEFL/V датащи(HTML) 32 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

датащи скачать

ссылки URL