WM8802SCFTV datasheet(33/65 Pages) WOLFSON

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WM8802

PP Rev 1.1 April 2004

DESCRIPTION OF MODULATION FUNCTION AND GENERAL-PURPOSE I/OS

MODULATION FUNCTION USAGE METHOD

INITIAL SETTING

The modulation function and general-purpose I/O port function cannot be used simultaneously

because they share the same pins. INT should be pulled down with a 10k

Ω resistor to select the

modulation function. For the setting method, see page 10.

In the initial setting, the modulation function is stopped. The modulation function can be set using

TXOPR.

DATA OUTPUT (TMCK, TBCK, TLRCK, TDATA, TXO)

Bi-phase modulated data is output from TXO by inputting a 256fs clock to TMCK, 64fs clock to

TBCK, fs clock to TLRCK and audio data to TDATA.

The polarity of the TLRCK clock is set using TXLRP.

Input data can be modulated in the sampling range of 32kHz to 192kHz, TMCK rate of 4MHz to

25MHz and up to 24 bit data.

The initial value for the input data format is I

2S. Switching to Left Justified format is set using TXDFS.

For the channel status, the first 48 bits of data can be written with the micro-controller interface.

TXO is fixed to Low by setting TXOPR to Stop.

LEFT

CHANNEL

RIGHT

CHANNEL

TLRCK (I)

TBCK (I)

TDATA (I)

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

1 BCLK

16 to 24 bits

Figure 25 Data Input Timing – I2S Data Input

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