Texas Instruments TPA6404-Q1 User manual

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TPA6404-Q1 Evaluation Module
User's Guide
SLOU479A–October 2017–Revised December 2017
TPA6404-Q1 Evaluation Module
This manual describes the operations of the TPA6404Q1E2EVM. The TPA6404Q1E2EVM 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
• TPA6404 EVM operations (hardware and software)
Required equipment and accessories:
1. TPA6404 EVM
2. USB A male to micro B male cable
3. Power Supply Unit (PSU) up to 18 V, 6-A capable
4. 1–4 resistive loads or speaker loads
5. 8 pairs of wires stripped both ends
6. 2-mm slotted screwdriver
7. Desktop or laptop PC with Microsoft®Windows®7 OS
8. Access to the internet for downloading software
Contents
1 Hardware Overview.......................................................................................................... 2
2 Software Overview........................................................................................................... 4
3 TPA6404 EVM Start Up..................................................................................................... 9
4 Board Layouts, Bill of Materials, and Schematic....................................................................... 16
List of Figures
1 TPA6404Q1 EVM............................................................................................................ 2
2 EVM Block Diagram......................................................................................................... 3
3 PPC3 Download Window................................................................................................... 4
4 PPC3 Window................................................................................................................ 5
5 Available Apps Window..................................................................................................... 5
6 TPA6404 EVM Home Window............................................................................................. 6
7 TPA6404 EVM Register Map Window.................................................................................... 7
8 TPA6404 EVM Device Monitor & Control Window...................................................................... 8
9 TPA6404 EVM Connections ............................................................................................... 9
10 Device Monitor & Control Window ....................................................................................... 10
11 Global Control Section..................................................................................................... 10
12 Channel Control Section .................................................................................................. 11
13 Miscellaneous Control Section ........................................................................................... 11
14 Faults / Warnings Section................................................................................................. 12
15 AC Load Diagnostics Section............................................................................................. 12
16 DC Load Diagnostics Section ............................................................................................ 13
17 Register Map Window ..................................................................................................... 13
18 I2C Window – I2C Logging ............................................................................................... 14

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19 I2C Window – Sending I2C Commands ................................................................................ 14
20 TPA6404Q1 EVM Top..................................................................................................... 16
21 TPA6404Q1 EVM Bottom................................................................................................. 17
22 TPA6404Q1 EVM Analog Inputs Schematic ........................................................................... 18
23 TPA6404Q1 EVM XMOS I/O Schematic................................................................................ 19
24 TPA6404Q1 Device Schematic .......................................................................................... 20
25 TPA6404Q1 EVM Power Supply Input Schematic .................................................................... 21
Trademarks
PurePath is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
1 Hardware Overview
1.1 TPA6404Q1 Evaluation Module Description
The TPA6404Q1 EVM can operate as a stand-alone EVM. USB adapter is provided for a more thorough
evaluation of the device. Figure 1 shows the EVM board.
Figure 1. TPA6404Q1 EVM

3.3-V
LDO 3.3 V
4.5- to 18-V
Input 4.5-18 V
TPA6404
2nd
ORDER LC
FILTER
2nd
ORDER LC
FILTER
LED
1.8 V
Differential
Outputs
DC Blocking
Capacitors RC LPF
VBAT
1.8-V
LDO
XMOS GPIO
I2C
USB
External
Audio
Input SHUTDOWN
MUTE
FAULT
WARN
USB (I2C)
Differential
Inputs
ANALOG
1.0 V
1-V
LDO
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Figure 2 shows the TPA6404E1 EVM signal flow:
Figure 2. EVM Block Diagram

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2 Software Overview
2.1 PurePath™ Console 3 (PPC3) Access and Description
PPC3 is a server-based tool. Request access at http://www.ti.com/tool/PUREPATHCONSOLE.
Once approval is given, download the software from www.ti.com/mysecuresoftware.
Figure 3. PPC3 Download Window
Run the installation program. Also download the PPC3 User Manual (slou408) for further instructions.

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Figure 4 shows the window displayed when first running PPC3.
Figure 4. PPC3 Window
When the window in Figure 4 is displayed, click on “sign in” to see TPA6404 EVM application. All of the
Apps in Figure 5 may not be displayed for you.
Figure 5. Available Apps Window

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Click the TPA6404 App box to download the TPA6404 application. An Installation window pops up, next
click Install.
The TPA6404 EVM box appears in the Installed EVM Apps section, see Figure 5. Click on the TPA6404
box to launch the TPA6404 App. There are three windows available with the TPA6404 EVM PPC3: Home
Window,Register Map Window, and Device Monitor & Control Window.
2.2 PurePath™ Console 3 – TPA6404 EVM Home Window
When the TPA6404 EVM PPC3 is launched, the Home Window displays (see Figure 6). If the EVM is
powered on and the USB is connected to the PC, 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, only TPA6404
EVM – Offline is displayed.
Figure 6. TPA6404 EVM Home Window

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2.3 PurePath™ Console 3 – TPA6404 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 the TPA6404 device.
Figure 7. TPA6404 EVM Register Map Window

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2.4 PurePath™ Console 3 – TPA6404 EVM Monitor & Control Window
When clicking on Device Monitor & Control box in the Home Window, the Device Monitor & Control
window is displayed. The Register Map indicates the current setting of all the registers in TPA6404.
Figure 8. TPA6404 EVM Device Monitor & Control Window

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3 TPA6404 EVM Start Up
This section describes the TPA6404 start up procedure. Have all the equipment and accessories listed on
the first page of this document available.
3.1 TPA6404 EVM Setup
Figure 9. TPA6404 EVM Connections
Hardware and software connections:
• Desktop or laptop PC running Windows 7. Open PPC3 GUI.
• Connect 14.4-VDC PSU to the TPA6404 EVM
• Connect speakers or resistive loads to the TPA6404 EVM
• Connect USB micro cable from the PC to the EVM
• Set the switches (STANDBY, MUTE) to down positions
• Turn on the PSU
• Connect the audio source – this can be a 3-mm stereo connector connected from the PC to the EVM
as shown in Figure 9.
• At this point, 3.3V LED, and USB-LOCK LED are on.
• On the PPC3 window, launch the TPA6404 EVM application
• Click Connect at the bottom left corner of the window
• Click Device Monitor & Control
• Click on Play at the top left corner of the window
• On the PC make sure the volume level is set as desired. The maximum level is quite loud.
• On the EVM, first switch up the STANDBY switch and then the MUTE switch
• The audio can now be streamed to the speakers

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3.2 TPA6404 Settings on Device Monitor & Control Window
Most of the register settings are done on the Device Monitor & Control window. The TPA6404 Register
Map window is for reference.
Click the CONNECT button on the bottom left corner of the TPA6404 EVM application window, see
Figure 7. The LED next to the TPA6404 EVM changes from gray to green and the CONNECT button
changes to a DISCONNECT button.
Click on the TPA6404 Device Monitor & Control box, the Device Monitor & Control window displays.
Figure 10. Device Monitor & Control Window
This window has 7 major sections: the global control section, channel control section, miscellaneous
control section, faults and warnings section, AC load diagnostics section, and DC load diagnostics section.
3.2.1 Global Control Section
The Hi-z,Mute and Unmute buttons with the gray background control all 4 channels at the same time.
When Hi-z is selected, all 4 channels are put in Hi-z. The display for each channel in the channel control
section reflects these button selections.
Figure 11. Global Control Section
The Reset button is a software reset. This puts the device back in default settings.

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3.2.2 Channel Control Section
Each channel has the same setting selections: Hi-z,Mute, and Play mode.
Figure 12. Channel Control Section
3.2.3 Miscellaneous Control Section
There are miscellaneous settings that are available on the GUI for easy access (see Figure 13).
Figure 13. Miscellaneous Control Section
The overcurrent has two levels. The lower level is 1, the default is level 2. When running 6- or 8-Ω
speakers, the OC level can be set to 1.
Overtemperature warning can be programmable, use the pull-down menu to choose the OTW
temperature. The default setting is 120°C.
The output switching frequency (FSW) or Pulse Width Modulation (PWM) frequency is set at 2.1 MHz. The
pull-down menu on the PWM FRQ box is used to choose a lower FSW.
The PWM output (at the pin) offset phase for each channel is set at 45 degrees. This 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. TI recommends using the default value. If other
settings are used, thorough testing is strongly recommended.
There are four gain settings in the TPA6404: low, medium, high and max. The default setting is standard
gain for driving speakers at 14.4 VDC. The gain setting is selectable via the drop-down menu in the Gain
box.

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3.2.4 Faults / Warnings Section
The top right buttons on the Faults / Warnings box serve as controlling and monitoring faults.
Clip enable route the clip detection bit to the warning pin. This is displayed as a yellow LED on the EVM.
Thermal enable route the overtemperature warning bit to the warning pin. This is displayed as the same
yellow LED on the EVM. The Clear button clears all the faults and warnings. The Read button manually
read the faults and warnings.
Figure 14. Faults / Warnings Section
3.2.5 AC Load Diagnostics Section
The AC load diagnostics report speaker impedance and phase. Diagnostics are performed with one or all
four channels.
Figure 15. AC Load Diagnostics Section
Select the correct output impedance and click the Start > button. Follow the pop up instructions to run the
load diagnostics.
Click on the icon located on the top right of the AC load diagnostics box to see the results.

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3.2.6 DC Load Diagnostics Section
The DC load diagnostics report if a channel is short to power, short to ground, short to load, or open.
Figure 16. DC Load Diagnostics Section
Select the impedance of the load from 0.5 to 5 Ω. Click Start > and then click the icon on the top
right of the box to view results.
If a channel is selected as a line-out, click on “LO ENA LD” to enable line-out load diagnostics. Use the
Retry box when DC load diagnostics are run more than one time. Exit DC load diagnostics by clicking the
Abort LD box.
3.3 TPA6404 Settings on Register Map Window
Select a particular register then double click on any bit, the bit will change state. This state is executed at
the end of the click.
Figure 17. Register Map Window

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3.4 I2C Window
The PPC3 has an I2C monitor and also configuration program options (see Figure 18).
Figure 18. I2C Window – I2C Logging
When this window is first open, the round button is green. To record I2C commands, click on this button
and it will turn red. The recording can be saved for later use by clicking the save icon.
The I2C commands can also be copied to the clip board by clicking the icon next to trash bin icon.
Figure 19. I2C Window – Sending I2C Commands

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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 in Figure 19. 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.

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4 Board Layouts, Bill of Materials, and Schematic
4.1 TPA6404 EVM Layouts
Figure 20 and Figure 21 illustrate the EVM board layouts.
Figure 20. TPA6404Q1 EVM Top

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Figure 21. TPA6404Q1 EVM Bottom

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4.2 TPA6404E1 EVM Schematic
Figure 22 and Figure 23 illustrate the EVM schematics.
Figure 22. TPA6404Q1 EVM Analog Inputs Schematic

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Figure 23. TPA6404Q1 EVM XMOS I/O Schematic

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Figure 24. TPA6404Q1 Device Schematic