STA321 datasheet(150/157 Pages) STMICROELECTRONICS

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I2C disabled (microless) mode

STA321

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Doc ID 15351 Rev 3

I2C disabled (microless) mode

Figure 55.

Microless mode block diagram

In microless mode (I2CDIS = 1) the I2C interface is inhibited and SDA and SCL are used as

static inputs. The device is working in the configuration shown in Figure 55 with the ADC

connected to input line 1 and to SAI out. The processing chain uses the inputs from SAI

input 1. The working modes are selected via the logical levels on the inputs SDA, SCL as

follows:

SCL = 0 : CMOS bridge outputs come from digital input serial audio interface;

SCL = 1 : CMOS bridge outputs come from analog ADC input.

SDA = 0 : external amplifier outputs come from digital input serial audio interface;

SDA = 1 : external amplifier outputs come from analog ADC input.

At power-up the channel volume is set to -60 dB. The volume is controlled by pulsing the

inputs LRCLKO and BICLKO as follows:

when pulsing LRCLKO = 1 and BICLKO = 1 simultaneously the channel volume is set

to 0 dB.

Any LRCLKO = 1 pulse causes a channel volume decrease of 0.5 dB.

Any BICLKO = 1 pulse causes a channel volume increase of 0.5 dB.

The channel volume change applies only to the external amplifier.

The digital output serial audio interface is always fed with the result of the ADC conversion

with no volume control (line-out mode). It is in master mode when SCL = 1 and SDA = 1

otherwise it is in slave mode. It is configured in I2S format.

The LRCLK and BICLK signals are shared between input and output SAI.

4-channel

sample rate

converter

Vol

ctrl

FFX™

modulator

Input

SAI

Osc

PLL

Divider

Output

SAI

CMOS

bridge

ADC

V_BIAS

VCM

VHI

VLO

BICLKI1

LRCLKI1

SDATAI1

INL1

INR1

BICLKI2

LRCLKI2

SDATAI2

INL2

INR2

SDATAO1

EAPWM4

EAPWM3

EAPWM2

EAPWM1

OUT1

OUT2

OUT3

PWM00

EAFTN

EATSN

EAPDN

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