STA014 datasheet(25/45 Pages) STMICROELECTRONICS

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PCMCONF

Address: 0x55 (85)

Type: R/W

Software Reset: 0x21

Hardware Reset: 0x21

MSB

LSB

Description

ORD

DIF

INV

FOR

SCL

PREC (1) PREC (1)

PCM order the LS bit is transmitted First

PCM order the MS bit is transmitted First

The word is right aligned

The word is left aligned

LRCKT Polarity compliant to I2S format

LRCKT Polarity inverted

I2S format

Different formats

Data are sent on the rising edge of SCKT

Data are sent on the falling edge of SCKT

16 bit mode (16 slots transmitted)

18 bit mode (32 slots transmitted)

20 bit mode (32 slots transmitted)

24 bit mode (32 slots transmitted)

PCMCONF is used to set the PCM Output Inter-

face configuration:

ORD: PCM order. If this bit is set to’1’, the LS Bit

is transmitted first, otherwise MS Bit is transmiited

first.

DIF: PCM_DIFF. It is used to select the position

of the valid data into the transmitted word. This

setting is significant only in 18/20/24 bit/word

mode.If it is set to ’0’ the word is right-padded,

otherwise it is left-padded.

INV (fig.13): It is used to select the LRCKT clock

polarity. If it is set to ’0’ the polarity is compliant to

I2S format (low -> left , high -> right), otherwise

the LRCKT is inverted. The default value is ’0’. (if

I2S have to be selected, must be set to ’0’ in the

STA014 configuration phase).

FOR: FORMAT is used to select the PCM Output

Interface format.

After hw and sw reset the value is set to 0 corre-

sponding to I

2S format.

SCL (fig.14): used to select the Transmitter Serial

Clock polarity. If set to ’1’ the data are sent on the

rising edge of SCKT and sampled on the falling. If

set to ’0’ , the data are sent on the falling edge

and sampled on the rising. This last option is the

most commonly used by the commercial DACs.

The default configuration for this flag is ’0’.

PREC [1:0]: PCM PRECISION

It is used to select the PCM samples precision, as

follows:

’00’: 16 bit mode (16 slots transmitted)

’01’: 18 bit mode (32 slots transmitted)

’10’: 20 bit mode (32 slots transmitted)

’11’: 24 bit mode (32 slots transmitted)

The PCM samples precision in STA014 can be

16 or 18-20-24 bits.

When STA014 operates in 16 (18-20-24) bits

mode, the number of bits transmitted during a

LRCKT period is 32 (64).

LEFT

LRCKT

INV_LRCLK=1

INV_LRCLK=0

LEFT

RIGHT

LEFT

D00AU1192

Figure 19. LRCKT Polarity Selection

INV_SCLK=0

SCKT

SDO

Figure 20. SCKT Polarity Selection

INV_SCLK=1

SCKT

SDO

STA014-STA014B-STA014T

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