STA321TR 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

STA321TR

4-channel digital audio system with FFX™ driver

STMicroelectronics 

Power-up and power-down sequences

4

Power-up and power-down sequences

STA321

4.1

Device power-up

After providing the power supply to the device, it is necessary to wait until the DC regulator

PWUP time has elapsed before the device can be set up and used for normal operations.

(see Figure 7).

Figure 7. Startup sequence

VVDDVIDODIO 3v3

VVDVDDD_RREEGG 2v2

VPVDPDVDD

SSTBTYB(Yact(iavectHiv) e H)

RRSTSNT(Nact(ivaecLti)ve L)

D(aPCctWiRveeDgH.NiPghW()aDcNtive H)

DC Reg. A. OK

(aAct.iOveKHi(gahc) tive H)

2

I IC2CrWearidtings

2

I CI2cCloCcLkK

XTXTI I//MMCCLLKK

Vdd ramp

DC reg. PWUP time

Device in reset mode

User configuration via I2C

Table 8. Power-up signal description

Signal/pin

Type

Description

VDDIO

Supply

Power supply of the digital pads (= VDDIO1,2)

VDD_REG Supply

Power supply of the system core (= VDD_REG1,2)

PVDD

Supply

Power supply of the PLL

STBY

In (digital) External standby signal provided by the user

RSTN

In (digital) External reset signal provided by the user

PWDN

Internal

Power-down of the DC regulator cell, controlled by the core

A. OK

I2C read

I2C clock

Internal

In (I2C)

Internal

DC regulator status, when active the 1.8 V is provided to the core

Configuration commands coming to the I2C interface

I2C peripheral clock

XTI/MCLK In (digital) Clock input source

20/157

Doc ID 15351 Rev 3

Share Link: