Texas Instruments TAS6424R-Q1 User manual

User's Guide
TAS6424R-Q1 Evaluation Module
ABSTRACT
This manual describes the operations of the TAS6424R-Q1 EVM. The TAS6424R-Q1 EVM is a stand-alone
EVM. The PurePath™ Control Console 3 GUI (PPC3) is used to initialize and operate the EVM. The main topics
of this document are:
• Hardware implementation and descriptions
• Software implementation and descriptions
• TAS6424R-Q1 EVM operations (hardware and software)
Required equipment and accessories:
1. TAS6424R-Q1 EVM
2. USB A male to micro B male cable
3. Power Supply Unit (PSU) up to 26.4 V, > 6 A capable, if J12 is removed and 12 V is provided.
If J12 is in, limit the input voltage to 18 V.
4. 1-4 resistive loads or speaker loads
5. 2-6 pair of wires stripped both ends
6. 2-mm slotted screwdriver
7. Optical audio source (optional)
8. Optical SPDIF cable (optional)
9. Desktop or laptop PC with Microsoft® Windows® 7 operating system
Table of Contents
1 Hardware Overview................................................................................................................................................................ 3
1.1 TAS6424R-Q1 Evaluation Module Description.................................................................................................................. 3
2 Software Overview..................................................................................................................................................................5
2.1 PurePath Console 3 (PPC3) Access and Description........................................................................................................5
2.2 PurePath Console 3 – TAS6424E EVM Home Window.....................................................................................................7
2.3 PurePath Console 3 – TAS6424E EVM Register Map Window.........................................................................................8
2.4 PurePath Console 3 – TAS6424E EVM Monitor and Control Window...............................................................................8
2.5 TAS6424R-Q1 EVM Start-Up Procedure........................................................................................................................... 9
3 Schematic, Board Layouts, and Bill of Materials...............................................................................................................16
3.1 TAS6424R-Q1 EVM Schematic....................................................................................................................................... 17
3.2 TAS6424R-Q1 EVM Layouts............................................................................................................................................21
3.3 Bill of Materials.................................................................................................................................................................22
4 Revision History................................................................................................................................................................... 28
List of Figures
Figure 1-1. TAS6424R-Q1 EVM.................................................................................................................................................. 3
Figure 1-2. EVM Block Diagram.................................................................................................................................................. 4
Figure 2-1. PPC3 Download Window.......................................................................................................................................... 5
Figure 2-2. PPC3 Window........................................................................................................................................................... 6
Figure 2-3. Available Apps Window.............................................................................................................................................6
Figure 2-4. PPC3 Window........................................................................................................................................................... 7
Figure 2-5. TAS6424E EVM Home Window................................................................................................................................ 7
Figure 2-6. TAS6424E EVM Register Map Window.................................................................................................................... 8
Figure 2-7. TAS6424E EVM Device Monitor and Control Window.............................................................................................. 8
Figure 2-8. TAS6424R-Q1 EVM Connection............................................................................................................................... 9
Figure 2-9. Device Monitor and Control Window....................................................................................................................... 10
Figure 2-10. Global Control Section.......................................................................................................................................... 10
www.ti.com Table of Contents
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 1
Copyright © 2023 Texas Instruments Incorporated

Figure 2-11. Channel Control Section........................................................................................................................................ 11
Figure 2-12. Miscellaneous Control Section.............................................................................................................................. 11
Figure 2-13. Faults and Warnings Section.................................................................................................................................12
Figure 2-14. AC Load Diagnostics Section................................................................................................................................12
Figure 2-15. DC Load Diagnostics Section................................................................................................................................13
Figure 2-16. Register Map Window........................................................................................................................................... 14
Figure 2-17. Register Map Window - Expanding....................................................................................................................... 14
Figure 2-18. I2C Window – I2C Logging....................................................................................................................................15
Figure 2-19. I2C Window – Sending I2C Commands................................................................................................................15
Figure 3-1. Schematic (Page 1).................................................................................................................................................17
Figure 3-2. Schematic (Page 2).................................................................................................................................................18
Figure 3-3. Schematic (Page 3).................................................................................................................................................19
Figure 3-4. Schematic (Page 4).................................................................................................................................................20
Figure 3-5. TAS6424R-Q1 EVM Top..........................................................................................................................................21
Figure 3-6. TAS6424R-Q1 EVM Bottom....................................................................................................................................21
List of Tables
Table 3-1. Bill of Materials..........................................................................................................................................................22
Trademarks
PurePath™ is a trademark of Texas Instruments.
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
All trademarks are the property of their respective owners.
Trademarks www.ti.com
2TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

1 Hardware Overview
1.1 TAS6424R-Q1 Evaluation Module Description
The TAS6424R-Q1 EVM is a stand-alone EVM. The EVM has single power supply input, USB control via
PurePath Control Console 3 (PPC3) and two digital (I2S) audio input options. See the EVM block diagram in
Figure 1-1.
Figure 1-1. TAS6424R-Q1 EVM
www.ti.com Hardware Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 3
Copyright © 2023 Texas Instruments Incorporated

The block diagram shows the TAS6424R-Q1 EVM signal flow.
PVDD
4.5 Vdc to
26.4 Vdc
VBAT
4.5 Vdc to
18 Vdc
3.3 Vdc LDO
Audio Input
SPDIF
Optical
DIR9001
XMOS
I2C and USB Audio
2nd order
LC Filters
I2S
Micro
USB I2C
I2S
SPDIF Power Switch
3.3 Vdc
Standby Switch
Mute Switch
I2S input
Connectors
Speaker
Outputs
/STBY
Mute
Fault
Input Power
Connector
VBAT
Jumper
PVDD
XMOS Enable Switch
TAS6424R-Q1
Mux
Figure 1-2. EVM Block Diagram
Hardware Overview www.ti.com
4TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2 Software Overview
2.1 PurePath Console 3 (PPC3) Access and Description
The PPC3 is a server-based tool. Access can be requested at http://www.ti.com/tool/PUREPATHCONSOLE.
Note
This EVM uses the PPC3 plug-in for the TAS6424E.
Once approval is given, go to www.ti.com/mysecuresoftware to download the software. After login, the web page
with a similar list of software products available for download is shown.
Figure 2-1. PPC3 Download Window
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 5
Copyright © 2023 Texas Instruments Incorporated

Run the installation program. Also download the PPC3 User Manual (SLOU408) for further instructions. The
following window is displayed when first running PPC3.
Figure 2-2. PPC3 Window
When the window in Figure 2-2 is displayed, click on the sign-in button to see the TAS6424E EVM application.
All of the apps shown below may not be displayed for the user.
Click on TAS6424E app box to download TAS6424E application. After the installation window pops up, click
Install.
TAS6424E EVM box appears in Installed EVM Apps section, see Figure 2-3. Click on TAS6424E box to launch
the TAS6424E App.
Figure 2-3. Available Apps Window
Software Overview www.ti.com
6TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.2 PurePath Console 3 – TAS6424E EVM Home Window
When the TAS6424E EVM PPC3 is launched, the Home Window is shown. If the EVM is powered on and the
USB is connected to the PC, then the Home Window displays the Connect box in the bottom right hand corner. If
the EVM is not powered on or the USB is not connected, then only the TAS6424E EVM – Offline is displayed.
Figure 2-4 shows the downloading progress of TAS6424E application.
Figure 2-4. PPC3 Window
There are three windows available with the TAS6424E EVM PPC3: Home Window, Register Map Window and
Device Monitor, and Control Window.
Figure 2-5. TAS6424E EVM Home Window
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 7
Copyright © 2023 Texas Instruments Incorporated

2.3 PurePath Console 3 – TAS6424E EVM Register Map Window
When clicking on the Register Map Box on the Home Window, the Register Map Window is displayed. The
Register Map indicates the current setting of all the registers in TAS6424R-Q1.
Figure 2-6. TAS6424E EVM Register Map Window
2.4 PurePath Console 3 – TAS6424E EVM Monitor and Control Window
By clicking on the Device Monitor and Control Box on the Home Window, the Device Monitor and Control
Window is displayed. See Figure 2-7 below.
Figure 2-7. TAS6424E EVM Device Monitor and Control Window
Software Overview www.ti.com
8TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.5 TAS6424R-Q1 EVM Start-Up Procedure
This section describes the TAS6424R-Q1 start-up procedure. The required equipment and accessories listed on
the first page of this document must be available.
2.5.1 TAS6424R-Q1 EVM Setup
Hardware and software connections:
1. Make sure that a desktop or laptop PC running Windows 7 is used.
2. Open PPC3 GUI.
3. Connect 14.4 VDC PSU to TAS6424R-Q1 EVM.
4. Connect speakers or resistive loads to TAS6424R-Q1 EVM.
5. Connect USB micro cable from PC to the EVM.
6. Set the switches (SPDIF, STANDBY, MUTE) to up positions.
7. Turn on the PSU.
8. Audio source: this can be a DVD player with optical SPDIF cable or Windows Media Player from PC.
9. At this point, 3.3 V LED, USB-LOCK LED and SPDIF-LOCK LED (if optical SPDIF is used) are on.
10. If the SPDIF LED is not on, then the default I2S input is the USB audio source.
11. On the PPC3 window, launch TAS6424E EVM application.
12. The audio can be streamed now to the speakers. Go to the GUI and click on Device Monitor & Control box.
Click on Play button located on the top right of the window.
Figure 2-8. TAS6424R-Q1 EVM Connection
The following sections describe the register settings of TAS6424R-Q1 in detail.
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 9
Copyright © 2023 Texas Instruments Incorporated

2.5.2 TAS6424R-Q1 Settings on Device Monitor and Control Window
The TAS6424E Register Map window is for reference. Most of the register settings are done on the Device
Monitor and Control window.
Click on the CONNECT button at the bottom left corner of the TAS6424E EVM application window, see Figure
2-9. The LED next to the TAS6424E EVM changes from gray to green and the CONNECT button changes to a
DISCONNECT button.
Click on the TAS6424E Device Monitor and Control box. Figure 2-9 shows how the window is displayed.
Figure 2-9. Device Monitor and Control Window
This window has six major sections: global control section, channel control section, other control section, faults
and warnings section, AC load diagnostics section, and DC load diagnostics section.
2.5.2.1 Global Control Section
The Hi-Z, Mute, and Unmute buttons with the gray background controls all four channels at the same time. When
Hi-Z is selected, all four channels are put in Hi-Z. The display for each channel in the channel control section
reflect these buttons selections.
The Mute Pin button is the GPIO pin controlling the mute function of the device.
The Standby button is the GPIO pin controlling the standby function of the device.
The Reset button is software reset and puts the device back in default settings.
Figure 2-10. Global Control Section
Software Overview www.ti.com
10 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.5.2.2 Channel Control Section
Each channel has the same setting selections: Hi-Z, Mute, Unmute, Volume, Line-out mode, and Speaker mode.
The drop-down menu allows the user to select either the Hi-Z, Mute, or Unmute state of each channel.
The volume slide controls the digital gain of each channel.
The default setting for each channel is speaker mode. If a line-out needs to be used, then select Line Output
button.
Figure 2-11. Channel Control Section
2.5.2.3 Miscellaneous Control Section
There are miscellaneous settings that are available on the GUI for easy access.
1. OSR is the oversampling bit. For lower idle noise, 64X OSR is set as default. For wider bandwidth, 128X
OSR can be used. 64X OSR is recommended.
2. TAS6424R-Q1 supports parallel Bridge-Tied Load. Channels 1 and 2 can be one PBTL channel and
channels 3 and 4 can be the other. Before setting a set of channels to PBTL mode, connect the (+) terminals
as PBTL channel (+) and the (-) terminals as PBTL channel (-). Then connect the speaker (+) to the PBTL
channel (+) and connect the speaker (-) to the PBTL channel (-).
3. The overcurrent has two levels. The lower level is 1. The default is level 2. When running at a lower output
current, the OC level can be set to 1. I2S and TDM are automatically detected. Use the pull-down menu from
the Input Format box to manually select the audio format.
4. If the sampling frequency is greater than 48 kHz, then select 96 kHz from the Input FS pull-down.
5. Overtemperature warning can be programmed by using the pull-down menu to choose the OTW
temperature. The default setting is 120°C.
6. The output switching frequency (FSW) or Pulse Width Modulation frequency (PWM) is set at 2.1 MHz. The
pull-down menu on the PWM FRQ box is used to choose a lower FSW. The LC value must be adjusted
when FSW is changed.
7. The offset phase for each channel is set at 45 degrees and helps lower the ripple current on the power
supply, as not all the channels switch at the same time. To choose a different phase offset, use the pull-down
menu on the Phase box.
8. There are four gain settings in TAS6424R-Q1: low, normal, high and maximum. The default setting is high.
However, the recommended setting is normal for lower noise performance for driving speakers at
14.4 VDC. The gain setting can be selected via the drop-down menu in the Gain box.
9. The volume slew rate is measured with the sampling frequency. The default setting is 1 period of the
sampling frequency (FSYNC or FS). This rate can be selected from 1 to 8 sampling periods with the
drop-down menu under Vol Rate box.
Figure 2-12. Miscellaneous Control Section
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 11
Copyright © 2023 Texas Instruments Incorporated

2.5.2.4 Faults and Warnings Section
The top right buttons on this box serve as the controlling and monitoring faults.
1. Clip enable button: route the clip detection bit to the warning pin. This button is displayed as yellow LED on
the EVM.
2. Thermal enable button: route the overtemperature warning bit to the warning pin. This button is displayed as
the same yellow LED on the EVM.
3. Clear button: clears all the faults and warnings.
4. Read button: manually read the faults and warnings.
Figure 2-13. Faults and Warnings Section
2.5.2.5 AC Load Diagnostics Section
AC load diagnostics report speaker impedance and phase. The diagnostics can be performed with one or all four
channels.
Select the correct output impedance and click Start. Follow the pop-up instructions to complete the load
diagnostics run.
Note
Make sure to set the digital input to 0 dBFS (100% full-scale). If the sine wave is provided from the
USB audio, then turn the audio media volume and PC sound card volume to maximum.
Click on the flip icon located on the top right of the AC load diagnostics box to see the results.
Figure 2-14. AC Load Diagnostics Section
Software Overview www.ti.com
12 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.5.2.6 DC Load Diagnostics Section
The DC load diagnostics report if a channel is short to power, short to ground, short to load or open.
1. Select the impedance of the load from 0.5 to 5 Ω. Click Start and then click the flip on the top right of the box
to view results.
2. If a channel is selected as a line-out, then click on Line-out Enable Diagnostic to enable the line-out load
diagnostics.
3. The Retry box is used when DC load diagnostics are run more than one time.
4. DC load diagnostics can be aborted by clicking on the Abort LD box.
Figure 2-15. DC Load Diagnostics Section
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 13
Copyright © 2023 Texas Instruments Incorporated

2.5.3 TAS6424R-Q1 Settings on Register Map Window
The register map can be sorted either alphabetically or numerically (register number).
Figure 2-16. Register Map Window
When a register is selected, the hex value along with the individual bit value is displayed. The name and
description for each bit are shown to the right in the Fields box.
Figure 2-17. Register Map Window - Expanding
Double click on any bit and the bit changes state. This state is executed at the end of the click.
Software Overview www.ti.com
14 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

2.5.4 I2C Window
The PPC3 has an I2C monitor and also configuration program options.
When this window is first opened, the round button is green. To record I2C commands, click on this button and
the button turns red. The recording can be saved by clicking the save icon.
The I2C commands can also be copied to the clipboard by clicking the icon next to trash bin icon.
Figure 2-18. I2C Window – I2C Logging
A set of I2C commands can be loaded and executed from this window. On the top right corner, click on the
I/O button to display the window above. Write I2C commands here or open an existing *.cfg file then click the
Execute button on the bottom left corner. The I2C commands are sent to the device when the Execute button is
pressed.
Figure 2-19. I2C Window – Sending I2C Commands
www.ti.com Software Overview
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 15
Copyright © 2023 Texas Instruments Incorporated

3 Schematic, Board Layouts, and Bill of Materials
Schematic, Board Layouts, and Bill of Materials www.ti.com
16 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

3.1 TAS6424R-Q1 EVM Schematic
Figure 3-1. Schematic (Page 1)
www.ti.com Schematic, Board Layouts, and Bill of Materials
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 17
Copyright © 2023 Texas Instruments Incorporated

Figure 3-2. Schematic (Page 2)
Schematic, Board Layouts, and Bill of Materials www.ti.com
18 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated

Figure 3-3. Schematic (Page 3)
www.ti.com Schematic, Board Layouts, and Bill of Materials
SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
TAS6424R-Q1 Evaluation Module 19
Copyright © 2023 Texas Instruments Incorporated

Figure 3-4. Schematic (Page 4)
Schematic, Board Layouts, and Bill of Materials www.ti.com
20 TAS6424R-Q1 Evaluation Module SLOU563A – APRIL 2023 – REVISED SEPTEMBER 2023
Submit Document Feedback
Copyright © 2023 Texas Instruments Incorporated