ST STA304 Manuale utente

1/13

AN1456

APPLICATION NOTE

January 2002

1 EVALUATION BOARD

The STA304 Digital Audio Processor is a single chip device implementing end to end digital solution for audio

application. In conjunction with STA500 Power Bridge it gives the full digital DSP-to-Power high quality chain

with no need for Digital-to Analog converters.

The STA304 Evaluation kit is an example for a general application involving all the STA304 and STA500 capa-

bilities, which gives the possibility to evaluate the system performances.

The evaluation kit consists of two boards, and control software. In the first board an STA304 and three STA500

are available, while the second is used to connect the main board to the PC. The control software allows then

to control all the evaluation board capabilities from a simple visual interface.

1.1 LPT Interface (LPT300)

In order to allow proper communication between the 3.3V powered (digital) evaluation board and a standard

LPT interface the STA304 evaluation kit includes also the LPT interface board (LPT300) shown in Figure 1.

Basically the interface will perform a signal level translation between 3.3V and 5V in both directions.

The LPT300 interface take the supply (both 3.3V and 5V) from pins 17 and 18 of the connector J2 (see Figure

2), so no regulators are on board. There is the possibility to have also the regulator on board (U3 and U4), but

in that case the pins 17 and 18 should be disconnected from the STA304 evaluation board. In Figure 2 the com-

ponents that are not needed for LPT300 (such as regulators) are drawn in dashed lines.

IMPORTANT:

the LPT300 interface can have some problems if the PC LPT port is configured as "bi-direction-

al". In order to perform a quick test, after the LPT300 is connected to the STA304 board, switch on the supply

and try the "Test procedure" (see the SETUP section). If the test doesn't succeed, try to check the PC parallel

port settings: most PC in fact, can configure their LPT interface in different modes (SPP/EPP/ECP) and it could

happen that some of those configurations are not well suited to control our evaluation kit.

Figure 1. LPT300 Interface Layout

- JP1, JP3 open without U3

and U4. Supply from J2

connector (default for

LPT300).

by Luca Molinari

STA304 + STA500 DIGITAL AUDIO PROCESSOR

EVALUATION BOARD OPERATING MANUAL

www.BDTIC.com/ST

AN1456 APPLICATION NOTE

2/13

Figure 2. LPT300 interface schematic

SCL

SDA

PWDN

AC97_MODE

RESET

PWRDN THWARN Left

THWARN Right

THWARN LFE

www.BDTIC.com/ST

3/13

AN1456 APPLICATION NOTE

1.2 STA304 Evaluation Board

The STA304 evaluation board layout is shown in Figure 3.

The board has one SPDIF input (differential, electrical single ended, and optical), and two serial inputs. Three

serial output are available, as well as five analog power outputs.

AC97 signals are available on connector J2 for an AC97 application (an AC97 external controller is needed).

Figure 3. STA304 eval. board layout

SPDIF

Electrical

Professional

(Differential)

SPDIF

Electrical

Consumer

(Single-end) SPDIF

Optical

SPDIF

Interface

Selector LPT300 connector Ac97 connector

5.0V

3.3V

Supply

Serial

Interface I/O

Clock Input

(Remove the crystal

before using)

www.BDTIC.com/ST

AN1456 APPLICATION NOTE

4/13

Three power stages (STA500) are mounted on board. The three devices take the analog supply from the termi-

nal J1 (10V up to 35V), as well as the digital supply from the IC6 regulator.

IC3 and IC4 are configured to drive 8 ohm load (up to 30 W) on LEFT,RIGHT,S-LEFT,S-RIGHT, while IC1 is

configured to drive 4 ohm load (up to 60 W) on LFE.

Some board behaviours are selectable from the Jumper and the switch on board, read carefully the "setup" sec-

tion to avoid board damages.

Before using the STA304 demo board, the jumper J4 and J5 must be shorted. This jumper could be used to

perform current measurement for STA304; in fact, they are in series to all the digital (J4) and the analog (J5)

STA304 supply.

In case of STA500 damage, it is possible to break the supply to the damaged device using the relative jumper

on the lower side of the board (near J1). Be sure that all the jumpers should be shorted if you want to use all the

three power chip.

6 CHANNELS APPLICATION SUGGESTIONS

For the 6 channels applications, like DTS and AC3 it is mandatory to use two STA304.

In order to obtain the best results in terms of Audio Quality, we suggest to drive each STA50X with two PWM

signals coming from a single STA304, otherwise some overlap of the PWM frames could generate undesired

noise.

One possible configuration is:

Left / Right / Surround L / Surround R from the first STA304, CENTRE and LFE from the second one.

If STA50X in mono configuration is used for LFE (4

Ω

application), than this LFE can be fed from any of the two

STA304 because no crosstalk is present.

www.BDTIC.com/ST

5/13

AN1456 APPLICATION NOTE

Figure 4.

For the

STA304 evaluation board schematic

VDD

SCKI LRCKI SDI2 SDI1 CKOUT SCKO SDO3 SDO2 SDO1 LRCKO

RESET

VCC

POWER

LFE

N.M.

S-LEFT

S-RIGHT

5-6-7-8

RIGHT

LEFT

N.M.

Ac97 MODE

TEST MODE

PWDN

SLEFT-B

LEFT-A

LEFT-B

RIGHT-A

RIGHT-B

SRIGHT-A

SRIGHT-B

TH_WAR-2

TH_WAR-3

TH_WAR-1

LFE-B

LFE-A

TH_WAR-3

PWDN

SRIGHT-B

SLEFT-A

SLEFT-B

PWDN

TH_WAR-2

SLEFT-A

SRIGHT-A

LEFT-A

RIGHT-A

RIGHT-B

PWRDN

LEFT-B

PWRDN

TH_WAR-1

PWRDN

LFE-B

LFE-A

+3.3

+5V

+3.3V

+3.3

+5V +3.3V

+3.3V VCCA

+3.3

VCC

+5V

+3.3V

+3.3 +3.3V

VCC VCCA

J12

J10

J9J8 J11

IC2

STA300

SDI1/SDATA_OUT

SDI2/SDATA_IN

LRCKI/SYNC

BCKI/BIT_CLK

VDD1

GND1

RESET

AC97_MODE

SDA

SCL

TEST_MODE

VDD2

XTI

XTO

GND2

VCC

RXP

RXN

VSS

LFE_B

LFE_A

SRIGHT_B

SRIGHT_A

GND3

VDD3

RIGHT_B

RIGHT_A

LEFT_B

LEFT_A

GND4

VDD4

SLEFT_B

SLEFT_A

EAPD

LRCKO

SDO1

SDO2

SDO3

SCKO

GND5

VDD5

CKOUT

PWDN

J4 J5 J7

100nF

J3 J6

C21

100nF

L11

L12

C68

10uF 16V

C73

100nF

C32

100nF

C42 100nF

C44

100nF

C45

100nF

R29

100

C58 100nF

C38 100nF

J20

R26

SMD0

Q1 6.144MHz

1 2

R25 1M

C56

18pF

C57

18pF

J17

RX178A

DATA

GND

+VS

J18

SW2-1

SW2-2

J23

TP8

TP9

TP1

C49

100nF

C72

100nF

IC6

LD1086DT33

GND

OUT

C71

100nF

C70

100nF

IC5

LD1086DT50

GND

OUT

C67

10uF 16V

C66

10uF 16V

C65

10uF 16V

J21

SW1

C25

1nF

R9 10K

C10

220nF

C11 1uF

R4 10K

L1 10uH

10K

R6 0

202

C15 100nF

L2 10uH

2.2

C14

100nF

C3 220nF

C17 100nF

1uF

TP3

C5 1000uF 35V

R7 0

100nF

220nF

C2 1uF

C12 220nF

680pF

J13

J15

R12 10K

C26

100nF

C40

100nF

C30 1uF

C33

100nF

L4 22uH

C37

470nF

L5 22uH

TP5

R17 0

C41 100nF

C20

330pF

J16

C29 100nF

C27

100nF

R13

TP6

C34

330pF

R14

10K

C16 100nF

L7 22uH

TP7

R18 0

C23

470nF

L3 22uH

C19

100nF

C31 100nF

R16

C36

100nF

J14

R15

R10

TP4

R19 10K

R22 10K

R20 10K

SW3

412

R21 10K

R36 0

TP12

C48

330pF

C47

100nF

TP13

TP10

C69

470nF

C55 100nF

R32

10K

L9 22uH

R27

C64

100nF

C51

470nF

R28

22 IC4

STA500

18 19

GND-SUB

OUT2B

VCC2B

GND2B

GND2A

VCC2A

OUT2A

OUT1B

VCC1B

GND1B

GND1A

VCC1A

OUT1A

N.C. GND-Clean

GND-Reg

VDD

IBIAS

CONFIG

PWRDN

TRI-STATE

FAULT

TH_WAR

IN1A

IN1B

IN2A

IN2B

VSS

VCCSign.

C74 100nF

C52

100nF

C59 1uF

J22

R30 10K

C62

330pF

R35 0

J19

R33

C75

100nF

L13 22uHC76 100nF

C61

100nF

L8 22uH

C50

470uF 35V

R31

C77 100nF

C46 100nF

C60 100nF

TP11

C54 1uF

C53

100nF

R34

R23

JP4

JP5

LF1

C4A

100nF

2200uF 35V

C28 1uF

IC1

STA500

18 19

GND-SUB

OUT2B

VCC2B

GND2B

GND2A

VCC2A

OUT2A

OUT1B

VCC1B

GND1B

GND1A

VCC1A

OUT1A

N.C. GND-Clean

GND-Reg

VDD

IBIAS

CONFIG

PWRDN

TRI-STATE

FAULT

TH_WAR

IN1A

IN1B

IN2A

IN2B

VSS

VCCSign.

R24

C39 100nF

C43 100nF

C24

100nF

IC3

STA500

18 19

GND-SUB

OUT2B

VCC2B

GND2B

GND2A

VCC2A

OUT2A

OUT1B

VCC1B

GND1B

GND1A

VCC1A

OUT1A

N.C. GND-Clean

GND-Reg

VDD

IBIAS

CONFIG

PWRDN

TRI-STATE

FAULT

TH_WAR

IN1A

IN1B

IN2A

IN2B

VSS

VCCSign.

TP2

C27A

100nF

C18

100nF

C53A

100nF

L10 22uH

R3A

R11

C50A

470uF 35V

www.BDTIC.com/ST

AN1456 APPLICATION NOTE

6/13

1.3 Setup and configuration

Before connecting the LPT300 and STA304 boards, check the jumper configuration:

The SW3 switch should be configured in this way:

■AC97 "ON" (switch 1)

■TEST_MODE "OFF" (switch 2)

■SA "OFF" (switch 3)

■PWDN "ON" (switch 4)

It is mandatory that the second switch is OFF, otherwise the STA304 is set to TEST MODE.

To avoid board damages the switch 1 and 4 should not be OFF when the LPT interface is connected. The sec-

ond switch set the SA pin, so the I2C address can be changed. Up to now the demo board software can use

only the seven bit address 0x1E (011110), so SA should be OFF.

Now the LPT300 interface and the STA304 demo board could be plugged together (BE CAREFUL, See Figure

5 for the plug).

Connect the PC parallel port to the LPT board using a parallel cable, and turn on the board supply.

Run STA304.exe on the PC, and select the Register page. Push the "RESET" button. In this condition the board

should waste about 150-200mA.

Try now the "TEST" button, the software should read the first four, and the last four registers via I2C. If the val-

ues read are equal to the default the "Pass" message should appear, and the I2C interface is working.

If the test fail, try first of all to check the PC configuration. Try to change the parallel port configuration (EPP,

ECP, etc.) and retry the test procedure starting from the RESET.

If the test is still fail, check the supply on the LPT interface, and on the STA304 demo board. Try to check also

if the I2C signals (SCL, SDA) are moving while the TEST button is pressed. If SDA or SCL are not moving, may-

be the LPT interface could be damaged.

Figure 5.

To select the SPDIF input way, the switch SW2 must be configured:

The numbers in the first column mean that a slider in the SW2 switch must be put in that position: for example

2-4-6-8 means that a slider must be in position 2, an other in position 4, an other in position 6, and the last in

position 8.

When the Electrical Professional interface is selected, it is mandatory that the STA304 be configured as SPDIF

SW2 config. Selected Interface

2-4-6-8 Electrical Professional

1-3-6-8 Electrical consumer

1-3-5-7 Optical

Component side

STA300 Evaluation Board

LPT300

www.BDTIC.com/ST

7/13

AN1456 APPLICATION NOTE

Analog (I/O Page in the control panel) . For the other interfaces, both Analog and digital could be used depend-

ing on input SPDIF levels. SPDIF digital could be used only if the RXP signal is in the range 0.2*VDD for ViL,

and 0.8*VDD for ViH. SPDIF Analog could be used if the input SPDIF signal is above 400 mV peak to peak.

1.4 DDX Output

To activate the five DDX outputs the following procedure must be used:

– Select the input interface (the presets 1, 2 ,3 could be used) from I/O Page;

– Select ST Table in Main Page;

– Remove the mute in the Main Page (*);

– Remove the DDX Reset in Main Page;

– Push Turn ON in Main Page.

At this point Sound should exit from the STA500.

(*) To avoid potential malfunctionings, it is recommended to remove the DDX mute only when both SRC and SPDIF are locked, i.e.:

- If SPDIF is used, the first two bits of 77h address must be: bit 0 = 0, bit 1 = 0.

- If I2S is used, the first two bits of 77h address must be bit 0 = 0, bit 1 = don’t care because it is referred to SPDIF.

2 CONTROL SOFTWARE

In order to control and evaluate the STA304 board a dedicated control panel has been developed. It runs on

Win95/98 operating system and allows complete DSP control (volume, mute, tone, etc.), full Serial and SPDIF

configuration, and demo board status monitoring (thermal warning, SPDIF and sample rate converter lock).

2.1 Main Page

1) The "Controls" section groups the volume, mute and tone controls for the STA304 demo board. There is a

master mute that automatically check all the mute controls, and a Left/Right Lock that link together L-R SL-

SR and CNT-LFE volume sliders. The range for the volume sliders depends on the full compliant bit in reg.

www.BDTIC.com/ST

AN1456 APPLICATION NOTE

8/13

5Ah (see I/O Page) as described in the datasheet.

2) In this section some configuration bits are grouped (see the registers on data sheet for more info).

3) The section 3 groups the status 'led' for the board. There are 3 thermal warning (red if a STA500 goes in

over heat), and two lock led for the Sample Rate Converter (SRC) and for the SPDIF.

When a thermal warning is detected, the corresponding STA500 channels will be automatically muted to

avoid the part destruction (in this case a by hand power off should be suggested). All the led are updated

every 300 ms.

4) Some default control presets are already present in those 6 memories. To store the current control position

just press down one of those buttons until it's automatically released. The presets buttons store and restore

not only the volume, the tone and the mute settings, but the all registers that define the fundamental behav-

iour of STA304 demo board, such as if using SPDIF or I2S, the DDX table, etc. (registers

0x02;0x03;0x08;0x09;0x26;0x27;0x36:0x39;0x5A:0x77). As soon as the software is started, in the memory

M1,M4,M5 and M6 are stored the default STA304 settings (i.e. the RESET values), while in the memory M2

there are the "SPDIF differential" settings, and finally in the memory M3 there are the "SPDIF digital".

5) Use this check-box to globally enable or disable the ToolTip function.

6) The "Turn off/on" button is used to put in power down or resume from the power down the STA500, while

the "Standby/Resume" button put (resume) the STA304 in (from) powerdown, leaving the I2C and AC97 in-

terface alive.

When entering in this page, all the controls are updated reading the STA304 registers.

2.2 I/O Page

In this page, all the input/output interfaces can be configured.

1) This 3 radio buttons are used to select from the 3 input interfaces supported by the STA304.

2) Regarding AC97, the software controls only the full compliant bit (if checked the STA304 works in full com-

pliant mode as described in the datasheet).

www.BDTIC.com/ST

9/13

AN1456 APPLICATION NOTE

3) The Serial interface has different configurations. Choosing "Bit Clock Polarity" and "LR Clock Polarity", the

bit and word clock polarity can be changed; the 'Alignment' field changes the data alignment respect to the

word clock, and the number of active bit clock edges (see DAP input Stage section in the datasheet).

4) If 'Digital Input' is checked, the internal SPDIF trigger is bypassed, and only the RXP signal is used by

STA304. In this configuration the input signal range is 0.2*VDD for ViL and 0.8*VDD for ViH. Otherwise RXP

and RXN pass through a Differential schmitt trigger, and the signal should follow the AES3 specifications.

5) The output serial interface is configured in the same way of the input one (see I2S Output Interface section

in the datasheet).

When entering in this page, all the controls are updated reading the STA304 registers.

2.3 Download Page

Using this page it is possible to read and download the coefficients in STA304. It is possible also to save and

load from file the values.

■Load: pushing the load button a load dialog will appear, and selecting a coefficients file the table 2 will

be updated with the new values read.

■Save: pushing the save button a save dialog will appear, selecting a file name the coefficient table will

be saved.

■Download: pushing this button the current table value will be stored in STA304.

■Read: pushing this button all the coefficientvalues will be read from STA304,and the table updatedwith

the read values.

Itis possibleto write a commentfor the coefficients file (inbox 1), and itwill be saved during the save procedure,

and loaded in the load procedure.

www.BDTIC.com/ST

AN1456 APPLICATION NOTE

10/13

A coefficients file is made of two comment lines at the top (comments begin with '#'), and a list of pair address-

value for every coefficient. Note that is not mandatory to put all the coefficients in the file, but only the needed

coefficient can be put. The numeric format for address and values can be either decimal or hexadecimal (ex.

0x1A). To have an example, the suggestion is to try to save the current coefficients, and to take a look to the

saved file.

The C code linked to the Download button is:

The whole coefficients table is parsed with the "for(int i…" loop. A coefficient is written using the procedure de-

scribed in Chapter 10 of the datasheet.

Regarding the read button, the code is:

In this case all the coefficients are read, and stored in the table m_coeff_list.

The code above is just to show the read/write coefficient procedure, is not intended to show a real application

code. Every application could have different code.

BOOL DownloadPage::DownloadCoeff()

{BOOL result=TRUE;

char elem[8];

int val;

for(int i=0;i<NCOEF;++i)

{m_coeff_list.GetItemText(i,1,elem,7);

sscanf(elem,"%x",&val);

result = result && WriteByte(0x78,(val & 0x0ff00)>>8);

result = result && WriteByte(0x79,(val & 0x000ff)>>0);

result = result && WriteByte(0x7A,(i+0x40));

result = result && WriteByte(0x7B,0x0f & ((val & 0xf0000)>>16));

}

return(result);

}

void DownloadPage::OnCoeffRead()

{// TODO: Add your control notification handler code here

int add,coe;

char st[6];

unsigned char dataL,dataM,dataH;

for(add=0;add<NCOEF;++add)

{WriteByte(Coefficent_1H_ADD,(unsigned char)add+0x40);

WriteByte(Coefficent_1L_ADD,(1<<7));

ReadByte(Coefficent_0H_ADD,&dataM);

ReadByte(Coefficent_0L_ADD,&dataL);

ReadByte(Coefficent_1L_ADD,&dataH);

dataH&=0xF;

coe=(unsigned int)dataL+((unsigned int)dataM *256)+

((unsigned int)dataH *256*256);

sprintf(st, "%05x", coe);

m_coeff_list.SetItemText(add,1,st);

}

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