Texas Instruments TAS6424E-Q1 User manual

User’s Guide
TAS6424E-Q1 EVM
Gregg Scott
ABSTRACT
This manual describes the operations of the TAS6424EQ1EVM. The TAS6424EQ1EVM 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
• TAS6424E-Q1 EVM operations (hardware and software)
Required equipment and accessories:
1. TAS6424E-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 Trademarks..............................................................................................................................................................................1
2 Hardware Overview................................................................................................................................................................ 2
3 Software Overview..................................................................................................................................................................4
4 Board Layouts, Bill of Materials, and Schematic...............................................................................................................20
5 Revision History................................................................................................................................................................... 32
List of Tables
1 Trademarks
PurePath™ are trademarks of Texas Instruments.
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
All trademarks are the property of their respective owners.
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2 Hardware Overview
2.1 TAS6424E-Q1 Evaluation Module Description
The TAS6424E-Q1 EVM is a stand-alone EVM. It 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 2-1.
Figure 2-1. TAS6424E-Q1 EVM
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The block diagram shows the TAS6424E-Q1 EVM signal flow.
PVDD
4.5 Vdc to 26.4 Vdc
VBAT
4.5 Vdc to 18Vdc
3.3 Vdc LDO
Audio Input
SPDIF
Optical
DIR9001
XMOS
I2C and USB Audio
2nd order
LC Filters
TAS6424E-Q1
Micro
USB
SPDIF Power Switch
Standby Switch
Mute Switch
I2S input
Connectors
Speaker
Outputs
Input Power
Connector
Jumper
XMOS Enable Switch
3.3 Vdc
I2S
I2S
Fault
I2C
/STBY
Mute
PVDD
VBAT
MUX
Figure 2-2. EVM Block Diagram
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3 Software Overview
3.1 PurePath™ Console 3 (PPC3) Access and Description
The PPC3 is a server-based tool. Access can be requested on http://www.ti.com/tool/PUREPATHCONSOLE.
Once approval is given, go to www.ti.com/mysecuresoftware to download the software. After login, the user will
see this web page with a similar list of software products available for download.
Figure 3-1. PPC3 Download Window
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Run the installation program. Also download the PPC3 User Manual (SLOU408) for further instructions. The
following window is displayed when first running PPC3.
Figure 3-2. PPC3 Window
When the window in Figure 3-2 is displayed, click on “sign in” to see TAS6424E EVM application. All of the apps
shown below may not be displayed for the user.
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Click on TAS6424E App box to download TAS6424E application. Installation window will pop up, then click
“Install”.
TAS6424E EVM box will appear in “Installed EVM Apps” section, see Figure 3-3. Click on TAS6424E box to
launch TAS6424E App.
Figure 3-3. Available Apps Window
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3.2 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, the Home Window will display “Connect” box in the bottom right hand corner. If the
EVM is not powered on or the USB is not connected, only “TAS6424E EVM – Offline” is displayed.
Figure 3-4 shows the downloading progress of TAS6424E-Q1 applications.
Figure 3-4. PPC3 Window
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There are three windows available with the TAS6424E EVM PPC3: Home Window, Register Map Window and
Device Monitor and Control Window.
Figure 3-5. TAS6424E EVM Home Window
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3.3 PurePath™ Console 3 – TAS6424E EVM Register Map Window
When click on 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 TAS6424E-Q1.
Figure 3-6. TAS6424E EVM Register Map Window
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3.4 PurePath™ Console 3 – TAS6424E EVM Monitor and Control Window
When click on Device Monitor and Control Box on the Home Window, the Device Monitor and Control Window is
displayed.
Figure 3-7. TAS6424E EVM Device Monitor and Control Window
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3.5 TAS6424E-Q1 EVM Start Up
This section describes the TAS6424E-Q1 start-up procedure. Have the equipment and accessories listed on the
first page of this document available.
3.5.1 TAS6424E-Q1 EVM Setup
Hardware and software connections:
• Desk top or laptop PC running Windows 7. Open PPC3 GUI.
• Connect 14.4 VDC PSU to TAS6424E-Q1 EVM
• Connect speakers or resistive loads to TAS6424E-Q1 EVM
• Connect USB micro cable from PC to the EVM
• Set the switches (SPDIF, STANDBY, MUTE) to up positions
• Turn on the PSU
• Audio source: This can be a DVD player with optical SPDIF cable or Windows Media Player from PC
• At this point, 3.3 V LED, USB-LOCK LED and SPDIF-LOCK LED (if optical SPDIF is used) are on.
• If the SPDIF LED is not on, the default I2S input is the USB audio source.
• On the PPC3 window, launch TAS6424E EVM application
• 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.
• The following sections describe in detail the register settings of TAS6424E-Q1.
Figure 3-8. TAS6424E-Q1 EVM Connection
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3.5.2 TAS6424E-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 “CONNECT” button on the bottom left corner of the TAS6424E EVM application window, see Figure
3-9. The LED next to the TAS6424E EVM changes from gray to green and the “CONNECT” button changes to
“DISCONNECT” button.
Click on the TAS6424E Device Monitor and Control box. The following window is displayed.
Figure 3-9. Device Monitor and Control Window
This window has 6 major sections: global control section, channel control section, other control section, faults
and warnings section, AC load diagnostics section and DC load diagnostics section.
3.5.2.1 Global Control Section
The Hi-Z, Mute and Unmute buttons with the gray background controls 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 will
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. This will put the device back in default settings.
Figure 3-10. Global Control Section
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3.5.2.2 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 user to select either 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 line-out is used, select Line Output button.
Figure 3-11. Channel Control Section
3.5.2.3 Miscellaneous Control Section
There are miscellaneous settings that are available on the GUI for easy access.
OSR is oversampling bit. For lower idle noise 64X OSR is set as default. For wider bandwidth, 128X OSR can be
used. 64X OSR is recommended.
TAS6424E-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 (-).
The over-current has two levels. The lower level is 1. The default is level 2. When running at lower output
current, OC level can be set to 1. I2S and TDM are automatically detected. Use the pull down menu from “Input
Format” box to manually select the audio format.
If sampling frequency is greater than 48 kHz, select 96 kHz from the “Input FS” pull down.
Over-temperature 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 frequency (PWM) is set at 2.1 MHz. The
pull-down menu on the PWM FRQ box is used to choose a lower FSW. LC value should be adjusted when FSW
is changed.
The 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.
There are four gain settings in TAS6424E-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 is selectable via the drop down menu in the ”Gain” box.
The volume slew rate is measured with sampling frequency. The default setting is 1 period of sampling
frequency (FSYNC or FS). This rate is selectable from 1 to 8 sampling periods with the drop down menu
under “Vol Rate” box.
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Figure 3-12. Miscellaneous Control Section
3.5.2.4 Faults and Warnings Section
The top right buttons on this box serve as controlling and monitoring faults.
Clip enable route the clip detection bit to the warning pin. This is displayed as yellow LED on the EVM.
Thermal enable route the over-temperature warning bit to the warning pin. This is display as the same yellow
LED on the EVM.
Clear button clears all the faults and warnings.
Read button manually read the faults and warnings.
Figure 3-13. Faults and Warnings Section
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3.5.2.5 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, 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 3-14. AC Load Diagnostics Section
3.5.2.6 DC Load Diagnostics Section
The DC load diagnostics report if a channel is short to power, short to ground, short to load or open.
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.
If a channel is selected as a line-out, click on “LO ENA LD” to enable line-out load diagnostics.
“Retry” box is used when DC load diagnostics are run more than one time.
DC load diagnostics can be aborted by click on the “Abort LD” box.
Figure 3-15. DC Load Diagnostics Section
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3.5.3 TAS6424E-Q1 Settings on Register Map Window
The register map can be sorted either alphabetically or numerically (register number).
Figure 3-16. Register Map Window
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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 3-17. Register Map Window - Expanding
Double click on any bit, the bit will change state. This state is executed at the end of the click.
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3.5.4 I2C Window
The PPC3 has an I2C monitor and also configuration program options.
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 used by clicking the save icon.
The I2C commands can also be copied to clip board by clicking the icon next to trash bin icon.
Figure 3-18. I2C Window – I2C Logging
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A set of I2C commands can be loaded and executed from this window. On the top right corner, click on “I/O”
button to display the above window. Write I2C commands here or open an existing *.cfg file then click “Execute”
button on the bottom left corner. The I2C commands are sent to the device when the “Execute” button is
pressed.
Figure 3-19. I2C Window – Sending I2C Commands
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4 Board Layouts, Bill of Materials, and Schematic
4.1 TAS6424E-Q1 EVM Layouts
Figure 4-1. TAS6424E-Q1 EVM Top
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