STA321 datasheet(23/157 Pages) STMICROELECTRONICS

Teilenummer	STA321

Bauteilbeschribung	4-channel digital audio system with FFX??driver

PDF	157 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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23 / 157 page

STA321

Power-up and power-down sequences

Doc ID 15351 Rev 3

23/157

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-down mode

YES

CMP_EN_N = 1 ?

Comp Cell Pwdn

DC_STBY_EN = 1 ?

YES

DC Reg. Stby

Embedded amp.

CMOS bridge

Powerdown

Power on

Pin STBY <= 1'

CLK_I2C off

CLK Core off

CLK_ADC off

PLL power down

2C programming

STBY_MODES

bits:

CMP_EN_N

DC_STBY_EN

STA321 Datenblatt(PDF) 23 Page - STMicroelectronics