UDA1342TS Просмотр технического описания (PDF) - Philips Electronics

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UDA1342TS

Audio CODEC

Philips Electronics 

Philips Semiconductors

Audio CODEC

Preliminary specification

UDA1342TS

8.14 Static pin mode

The controllable features in the static pin mode are:

• System clock frequency

• Data input and output format select

• ADC input channel select.

8.14.1 SYSTEM CLOCK SETTING SELECT

In the static pin mode pin L3CLOCK is used to select the

system clock setting.

Table 7 System clock setting

PIN

L3CLOCK

0

1

SYSTEM CLOCK SETTING

256fs

384fs

8.14.2 DIGITAL INTERFACE FORMAT SELECT

In the static pin mode the digital interface audio formats

can be selected via pins L3DATA and QMUTE. The

following interface formats can be selected (see Table 8):

• I2S-bus format with data word length of up to 24 bits

• MSB-justified output format and LSB-justified input

format with data word length of 16, 20 or 24 bits.

Table 8 Data format select in static pin mode

PIN

L3DATA

0

0

1

1

PIN

QMUTE

0

1

0

1

INPUT/OUTPUT FORMAT

I2S

LSB-justified 16 bits input and

MSB-justified output

LSB-justified 20 bits input and

MSB-justified output

LSB-justified 24 bits input and

MSB-justified output

8.14.3 ADC INPUT CHANNEL SELECT

In the static pin mode pin IPSEL selects the ADC input

channel.

Table 9 ADC input channel select

PIN

IPSEL

0

1

CHANNEL SELECT

input channel 1 (pins VINL1 and VINR1)

input channel 2 (pins VINL2 and VINR2)

8.15 L3-bus interface

All digital processing features and system controlling

features of the UD1342TS can be controlled by a

microcontroller via the L3-bus interface.

The controllable features are:

• Reset

• System clock frequency

• Data input and output format

• Multi purpose output

• ADC features

– Operation mode control

– Polarity control

– Input amplifier gain control

– Mixer control

– DC filtering.

• DAC features

– Power control

– Polarity control

– Input data oversampling rate

– Mixer position selection

– Mixer control

– Silence detector

– De-emphasis

– Volume

– Flat/min./max. switch

– Bass boost

– Treble

– Mute

– Quick mute mode.

8.15.1 INTRODUCTION

The exchange of data and control information between the

microcontroller and the UDA1342TS is accomplished

through a serial hardware interface comprising the

following pins:

• L3DATA: microcontroller interface data line

• L3MODE: microcontroller interface mode line

• L3CLOCK: microcontroller interface clock line.

The UDA1342TS acts as a slave receiver or a slave

transmitter. Therefore L3CLOCK and L3MODE lines

transfer only input data and the L3DATA line transfers

bidirectional data.

2000 Mar 29

14

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