STA321 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA321

4-channel digital audio system with FFX™ driver

STMicroelectronics 

STA321

Power-up and power-down sequences

4.3

Hardware power-down mode

The hardware power-down is obtained by asserting pin STBY to high.

There are two power-down options available, namely mild mode and full (or deep) mode,

that could be selected using the DC_STBY_EN signal in register STBY_MODES

Figure 8 summarizes the main power-down sequence. “Power on” is the normal operating

status where all the startup procedures have already been executed. The rectangular boxes

indicate the steps to be done by the user whilst the rounded boxes indicate the steps done

by the device.

Figure 8. Hardware power-done sequence

Power on

I2C programming

register

STBY_MODES

bits:

CMP_EN_N

DC_STBY_EN

YES

CMP_EN_N = 1 ?

NO

Comp Cell Pwdn

Pin STBY <= 1'

Embedded amp.

CMOS bridge

Powerdown

CLK_I2C off

CLK_ADC off

CLK Core off

PLL power down

YES

DC_STBY_EN = 1 ?

NO

DC Reg. Stby

Power-down mode

Doc ID 15351 Rev 3

23/157

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