Texas Instruments TAS2574 Manuale utente

EVM User's Guide: TAS2574 TAS2574EVM

TAS2574 Evaluation Module

Description

The TAS2574EVM has been designed to demonstrate

the performance of TAS2574 in a dual-mono

configuration. This tool utilizes the AC-MB

motherboard to provide an interface and supply

voltages to the EVM daughter card. Up to four devices

can share a common bus through I2S/TDM + I2C

interfaces; two EVMs can be mounted one on top of

each other, as shown in Section 2.8.

Get Started

1. Download TAS2574 data sheet.

2. Order the EVM at TAS2574 product folder.

3. Request access and download PPC3 from

TAS2574 product folder.

4. Visit and ask questions at e2e forum.

Features

• Mono or dual-mono speaker evaluation

• Interface using PurePath Console 3 Windows®

software

• EVM interconnection for up to 4 audio channels

• USB input

• External I2C and I2S/TDM host controller

connection available

Applications

•Mobile Phone, Tablets and Wearables

•Smart Speakers with Voice Assistance

•Bluetooth and Wireless Speakers

TAS2574 Dual-Mono Evaluation Module

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TAS2574 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

This user's guide describes the function and use of the TAS2574EVM. This document includes the hardware

configuration instructions, a quick-start guide, jumper and connector descriptions, software description,

schematics, and printed circuit board (PCB) layout that demonstrate TI's recommended practices for these

devices.

This section provides details on what is included inside the evaluation module box, what are TAS2574

capabilities and operation ranges, as well as what is the additional test equipment that can be required for

a full audio evaluation.

1.2 Kit Contents

The evaluation kit consists of the following items:

• TAS2574EVM

• AC-MB controller board

A speaker is not included in the kit, however any speaker can be connected to each of the amplifiers outputs

using the banana jacks or screw headers.

Similarly, a power supply is not part of the kit, but the barrel jack connector can be connected to any power

supply in a range of 2.4V to 5.5V.

1.3 Specification

The TAS2574 is a digital input Class-D audio amplifier optimized for delivering best battery life for real use case

of music playback and voice calls.

The integrated boost operation is flexible so that TAS2574 can be implemented in 1S, 2S and 3S battery

applications. TAS2574EVM showcases the 1S battery broadly used in mobile and industrial applications.

TAS2572

OUT_P

OUT_N

VBAT

BGND

GND

IOVDD

PGND

VDD

PVDD

VSNS_N

VSNS_P

VDD

1.65 V - 1.95 V

GREG

DREG

SDZ

AD1

IRQZ

IOVDD

1.2 V / 1.8 V

2.2 µF

0.1 µF

R2 C11

C10

Optional Components if EMI

filtering is required

AD2

1 µF

VBAT

2.5 V - 5.5 V

1 µF

VBAT_SNS

(opt.)

1 µF

10 µF

0.1 µF

10 µF

IOVDD

I2S

I2C

3 4 3

Figure 1-1. Application Diagram for 1 S Battery System

For 2 S battery applications, the boost inductor can be supplied by a higher supply from 4.5V to 9 V. VBAT pin is

still supplied by a voltage from 2.5V to 5.5V.

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TAS2572

OUT_P

OUT_N

VBAT

BGND

GND

IOVDD

PGND

VDD

PVDD

VSNS_N

VSNS_P

VDD

1.65 V - 1.95 V

GREG

DREG

SDZ

AD1

IRQZ

IOVDD

1.2 V / 1.8 V

2.2 µF

0.1 µF

R2 C11

C10

Optional Components if EMI

filtering is required

AD2

1 µF

VDD_5V

3.0 V - 5.5 V

1 µF

VBAT_SNS

(opt.)

1 µF

C5a

10 µF

0.1 µF

10 µF

IOVDD

I2S

I2C

3 4 3

VBAT2S

4.5 V - 9.0 V

Figure 1-2. Application Diagram for 2 S Battery System

In a 3 S battery application, the integrated boost can be bypassed, and an external power rail up to 14 V can

supply PVDD directly. The boost inductor is not required in this case and SW pins are left open. VBAT pin is still

supplied by a voltage from 2.5V to 5.5V.

TAS2572

OUT_P

OUT_N

VBAT

BGND

GND

IOVDD

PGND

VDD

PVDD

VSNS_N

VSNS_P

VDD

1.65 V - 1.95 V

GREG

DREG

SDZ

AD1

IRQZ

IOVDD

1.2 V / 1.8 V

2.2 µF

0.1 µF

R2 C11

C10

Optional Components if EMI

filtering is required

AD2

1 µF

VDD_5V

2.5 V - 5.5 V

1 µF

VBAT_SNS

(opt.)

0.1 µF

10 µF

IOVDD

I2S

I2C

3 4 3

PVDD (ext.)

(VBAT - 14 V)

Figure 1-3. Application Diagram for 3 S Battery System

1.4 Device Information

TAS2574 is a mono, digital-input, Class-D audio amplifier optimized for efficiently driving high peak power into

small loudspeaker applications. The Class-D amplifier is capable of delivering 6W of max average power into 8

Ω load at a battery voltage of 4.2 V. Integrated speaker voltage and current sense provides real time monitoring

of loud speakers. Up to four devices can share a common bus via I2S/TDM + I2C interfaces.

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TAS2574 Evaluation Module 3

2 Hardware

2.1 AC-MB Settings

2.1.1 Audio Serial Interface Settings

The AC-MB provides the digital audio signals to the evaluation module from the USB, optical connector, stereo

jack, and external audio serial interface (ASI) header. Figure 2-1 shows a block diagram of the ASI routing on the

AC-MB.

MUX

USB

Optical Input

Stereo Analog

Input

External ASI Header

Source

Selector

(SW2)

Audio

Processor

PCM921 1Optical Output

To EVM

Figure 2-1. AC-MB Audio Serial Interface Routing

Switch SW2 on the AC-MB selects the audio serial bus that interfaces with the TAS2574EVM daughter card.

Next to switch SW2, the AC-MB has a quick reference table to identify the audio serial interface source options

and switch settings. The AC-MB acts as the controller for the audio serial interface, with three different modes of

operation: USB, optical or analog, or external ASI.

2.1.2 USB

The serial interface clocks and data are provided from the USB interface. The sampling rate and format are

determined by the USB audio class driver on the operating system.

The default settings for the USB audio interface are 32-bit frame size, 48-kHz sampling rate, BCLK and FSYNC

ratio is 256, and the format is time division multiplexing (TDM).

The AC-MB is detected by the OS as an audio device with the name TI USB Audio UAC2.0. Figure 2-2

illustrates the AC-MB audio setting for the USB mode of operation.

Figure 2-2. AC-MB USB Audio Setting

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2.1.3 External

In this mode, the audio serial interface clocks for the evaluation board are provided through connector J7 from

an external source. This architecture allows the use of an external system to communicate with the evaluation

board, such as a different host processor or test equipment (for instance, Audio Precision PSIA). The clocks

generated from the USB interface and PCM9211 are isolated with this setting. Figure 2-3 shows the AC-MB

audio setting for the external mode of operation.

Figure 2-3. AC-MB External Audio Setting

Figure 2-4 shows how to connect the external audio interface, with the bottom row for the signal and the top row

for ground.

Figure 2-4. AC-MB Connection with External Audio Serial Interface

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TAS2574 Evaluation Module 5

2.2 AC-MB Power Supply

The AC-MB motherboard is powered from a single 5-V power supply. However, the motherboard has different

low-dropout regulators (LDOs) integrated that provide the required power supplies to the different blocks of

the board. Figure 3-1 shows a block diagram depicting the power structure of the AC-MB. The AC-MB can

be powered from the host computer by using the USB 5-V power supply (VBUS) by shorting header J5, USB

POWER. Additionally, the AC-MB can be powered from an external power supply connected to terminal J4,

EXTERNAL POWER. Header J5 must be open for external supply operation. The IOVDD voltage for the digital

signals that is provided to the evaluation module is generated on the motherboard from the main power supply

(USB or external). The voltage levels available are 1.2V, 1.8V and 3.3V, and can be selected via the J3 header

IOVDD. Default setting for TAS2574EVM operation is 1.8V; 3.3V operation cannot be used for TAS2574EVM.

When the motherboard is fully powered and the power supplies from the onboard LDOs are correct, the

green POWER LED (D3) turns ON. The USB READY LED indicates that a successful USB communication is

established between the AC-MB and the host computer.

Figure 2-5. Power -Supply Distribution of the AC-MB

2.3 Default Jumper Setting on TAS2574EVM

Figure 4-1 given below illustrates all the default jumper settings for TAS2574EVM.

Figure 2-6. Default Jumper Settings

Table 4-1 shows the default positions for all the jumpers on TAS2574EVM.

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Table 2-1. Default Jumper Settings

Jumper Setting Description

J7 Insert IOVDD current sense for U1

J8 Insert AVDD current sense for U1

J29 DNI External VBST for U1

J6 Insert VBAT pin current sense for U1

J93 Insert SDOUT break for U1

J82 Insert SDIN break for U1

J71 Insert RST break for U1

J60 Insert SBCLK break for U1

J50 Insert FSYNC break for U1

J13 Insert INT break for U1

J91 Insert SDA break for U1

J92 Insert SCL break for U1

J56 Insert (1-2) VBAT source selector for U1

J28 Insert (2-3) VBAT_SNS selector for U1

J39 Insert VBAT source from barrel jack for U1

J46 Insert VBAT source from barrel jack for U1

J34 Insert IOVDD current sense for U2

J35 Insert AVDD current sense for U2

J32 DNI External VBST for U2

J33 Insert VBAT pin current sense for U2

J97 Insert SDOUT break for U2

J96 Insert SDIN break for U2

J100 Insert RST break for U2

J94 Insert SBCLK break for U2

J95 Insert FSYNC break for U2

J14 Insert INT break for U2

J99 Insert SDA break for U2

J98 Insert SCL break for U2

J57 Insert (1-2) VBAT source selector for U2

J52 Insert (2-3) VBAT_SNS selector for U2

J41 Insert VBAT source from barrel jack for U2

J49 Insert VBAT source from barrel jack for U2

J74 DNI EEPROM write protect

J51 DNI EEPROM address selector

J37-4-9 IOVDD_MB Buffer source selector

J38-5-2 IOVDD_MB IOVDD source selector for U1 and U2

J36-11-10 IOVDD_MB AVDD source selector for U1 and U2

J45 Insert (2-3) 1.8V LDO source selector

J19 Insert I2C pull-up connect

J20 Insert I2C pull-up connect

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TAS2574 Evaluation Module 7

Table 2-1. Default Jumper Settings (continued)

Jumper Setting Description

J77 DNI FSYNC loopback for APx connection

J78 DNI SBCLK loopback for APx connection

2.4 I2C Target Address Selection

TAS2574EVM has DIP switches S2 and S3 for setting the I2C target address for each channel individually as per

the table provided in the silk screen of the PCB. Make sure both the devices have different target address.

Figure 2-7. DIP Switch S2-S3 for I2C Address Selection

2.5 IOVDD and AVDD Power Supply Options on EVM

TAS2574EVM daughter card provide multiple flexible options for IOVDD_BUFF, IOVDD and AVDD power

supplies. There are options to select between internal or external voltage sources for each of these supplies

individually.

IOVDD_BUFF is 1.8V power supply, which is used for the buffers and voltage translators.

IOVDD is the input/output power supply for TAS2574 device, which can be either 1.2V or 1.8V.

AVDD is the analog power supply for TAS2574 device, which is 1.8V fixed. If using IOVDD_MB from AC-MB as

1.2V, then make sure to select AVDD source to be either external or +1.8V_LDO.

Figure 6-1shows the default jumper setting for IOVDD_BUFF, IOVDD and AVDD. By default, 1.8V coming from

the AC-MB motherboard (IOVDD_MB) has been selected for IOVDD_BUFF, IOVDD and AVDD with the help of

jumper J9, J5 and J11.

Figure 2-8. Default Jumper Setting for IOVDD_BUFF, IOVDD and AVDD

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There are 1.8V and 3.3V LDOs included in the EVM. These LDOs are powered from the supply connected to

J43, or these can be supplied either from 5 V rail coming from AC-MB, depending on the configuration of jumper

J45.

2.6 VBAT Power Supply for TAS2574 on EVM

By default, the barrel jack connector J43 is used to power VBAT on both TAS2574 channels. Supply 2.4V-5.5V

on this connector.

Alternatively, independent connectors can be used for the external VBAT supply for both the channels –

VBAT1_IN and VBAT2_IN. Jumpers J39 and J46 must be open to disconnect VBAT to VBAT1_IN form J43

input, and similarly J41 and J49 must be open to disconnect VBAT to VBAT2_IN from J43 input.

For channel-1, external VBAT1_IN can be connected between connectors J30 (or J72) and J31 (or J73) as

shown in Figure 7-1.

For channel-2, external VBAT2_IN can be connected between connectors J55 (or J58) and J3 (or J59) as shown

in Figure 7-1.

Channel-1

VBAT1_IN

Channel-2

VBAT2_IN

Channel-1&2

VBAT_IN

Figure 2-9. VBAT Connector for Channel-1 and Channel-2

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TAS2574 Evaluation Module 9

2.6.1 VBAT 2S EVM Hardware Configuration

This section shows how to set the EVM jumpers in order to evaluate TAS2574EVM in a 2 S battery application

for VBAT as depicted in Figure 1-2.

In this case, VBAT pin C1 must still be connected to a power supply range from 3 V up to 5 V, while VBAT_SNS

and the boost inductor can be connected to a higher 2 S supply range from 4.5V up to 9 V.

• VBAT pin C1 connection can be connected to USB-5V by changing J56 position to 2-3 instead of 1-2.

• VBAT_SNS pin C4 connection can be modified using J28, this connection is optional.

• 2 S VBAT supply is directly available at J30 (or J72) and J31 (or J73) for channel-1 and J55 (or J58) and

J3 (or J59) for channel-2. If using J43 to supply 2 S battery voltage, then make sure to change J45 to use

+5V_MB instead.

2.6.2 VBAT 3S EVM Hardware Configuration

This section shows how to set the EVM jumpers in order to evaluate TAS2574EVM in a 3 S battery application

for VBAT as depicted in Figure 1-3.

VBAT pin C1 must still be connected to a power supply range from 3 V up to 5 V. VBAT_SNS cannot be used

so VBAT_SNS must be shorted to GND. The internal boost is not used, so the SW pins are left floating and the

inductor can be removed from the circuit.

3 S battery supply range from VBAT pin C1 level up to 14 V is directly connected to PVDD node, the decoupling

capacitors and GREG capacitor are still required.

• VBAT pin C1 connection can be connected to USB-5V by changing J56 position to 2-3 instead of 1-2.

• VBAT_SNS pin C4 connection must be left as default with J28 shorted across pins 2-3.

• 3 S VBAT supply must be connected to J1 for channel-1 and J12 for channel-2, short the jumpers across J29

and J32.

2.7 1-Channel Configuration

When only one of the amplifiers on the TAS2574EVM is required, the other device can be completely isolated

from the circuit. This section includes instructions on how to disconnect U2, however the same procedure can be

applied to disconnect U1.

• The block of jumpers from J98 through J33 must be disconnected, as well as J57 and J52 in the same row.

This removes all digital signals and VBAT supply as well.

• J34 and J35 to the left of U2 must be disconnected as well. This removes IOVDD and AVDD supplies.

• J41 and J49 must be disconnected as well. This removes VBAT connection from J43 to the boost inductor.

2.8 4-Channel Configuration

Two dual-mono EVMs can be interconnected using J75 and J76 headers, mounting one EVM on top of another.

This enables the evaluation of a total of 4 audio channels.

When 2 EVMs are interconnected, the following jumper configuration must be considered:

• Short jumper J51 on one of the EVMs, this jumper is open by default.

• Open jumpers J19 and J20 on both EVMs, these jumpers are shorted by default.

In addition to the jumper configurations, make sure each amplifier is set for a different I2C address using S2 and

S3 on each EVM.

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