Texas Instruments TAS2555EVM User manual

TAS2555EVM
User's Guide
Literature Number: SLOU411
August 2015

Contents
1 Description.......................................................................................................................... 5
2 Specifications...................................................................................................................... 5
3 Software ............................................................................................................................. 5
4 Mono Setup......................................................................................................................... 6
5 Digital Audio Interfaces ........................................................................................................ 7
5.1 Digital Audio Interface Selection ....................................................................................... 8
6 PurePath Console 3 Software................................................................................................ 9
7 Stereo............................................................................................................................... 10
8 Schematics, PCB Layout, and Bill of Materials....................................................................... 12
8.1 TAS2555EVM Schematics ............................................................................................ 12
8.2 TAS2555EVM Printed-Circuit Board (PCB) Layouts............................................................... 16
8.3 TAS2555EVM Bill of Materials........................................................................................ 20
2Table of Contents SLOU411–August 2015
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List of Figures
1 TAS2555EVM ................................................................................................................ 6
2 Setting Default Playback Device........................................................................................... 7
3 USB Audio Selection ........................................................................................................ 8
4 Direct (AP/PSIA) Audio Selection.......................................................................................... 9
5 Stereo Mode Using Two TAS2555EVMs ............................................................................... 10
6 Stereo Adapter Board Setup.............................................................................................. 11
7 TAS2555EVM USB Block................................................................................................. 12
8 TAS2555EVM Muxes and Translators .................................................................................. 13
9 TAS2555EVM Schematic ................................................................................................. 14
10 TAS2555EVM Power Supply ............................................................................................. 15
11 Top Overlay ................................................................................................................ 16
12 Top Solder Paste .......................................................................................................... 16
13 Top Solder Mask ........................................................................................................... 16
14 Top Layer ................................................................................................................... 17
15 Copper Layer 2............................................................................................................. 17
16 Copper Layer 3............................................................................................................. 17
17 Copper Layer 4............................................................................................................. 18
18 Copper Layer 5............................................................................................................. 18
19 Bottom Layer................................................................................................................ 18
20 Bottom Solder Mask ....................................................................................................... 19
21 Drill Drawing ................................................................................................................ 19
22 Board Dimensions ......................................................................................................... 19
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List of Tables
1 Default Jumper Settings .................................................................................................... 6
2 TAS2555EVM Bill of Materials ........................................................................................... 20
4List of Tables SLOU411–August 2015
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User's Guide
SLOU411–August 2015
TAS2555 Evaluation Module
This user's guide describes the characteristics, operation, and use of the TAS2555 Evaluation Module
(EVM). A complete schematic diagram, printed-circuit board layouts, and bill of materials are included in
this document.
1 Description
The TAS2555 device is an amplifier with integrated boost converter and programmable digital signal
processor. It can operate in various modes supporting Class-D, Class-G, and Class-H. The on-chip
voltage and current sense, together with TI’s SmartAmp®algorithm, protect the speaker against
overheating and excessive excursion.
The TAS2555EVM supports evaluation and development with the TAS2555 device through the following
interfaces:
• USB interface
– TAS2555 control through Purepath™ Console 3 (PPC3) GUI, USB-HID
– USB-class audio device, compatible with Microsoft®Windows®7+
• Digital audio AP and PSIA interface through 100-mil headers
• TI Learning Board 2 for speaker characterization
• SPI interface for TAS2555 control
• I2C interface for TAS2555 control
2 Specifications
Amplifier power supply (VBAT) 2.7 to 5.5 V
EVM power supply 5 V
IO power supply (IOVDD) 1.62 to 3.6 V
Output power 4 W
USB, USB class-audio MIcro-USB B
3 Software
The EVM requires Purepath Console 3 with the TAS2555EVM plug-in.
Purepath is a trademark of Texas Instruments.
SmartAmp is a registered trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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Mono Setup www.ti.com
4 Mono Setup
1. Install Purepath Console 3 with the TAS2555EVM plug-in.
2. Connect a speaker to J8 on the EVM.
3. Attach a 5-V, 2-A power supply to connector J29 (inner = 5 V, outer = GND).
4. Connect the EVM to a Windows 7+ PC with a micro-USB cable (J23). It will enumerate as a USB
class-audio device (sound card).
Figure 1. TAS2555EVM
Table 1. Default Jumper Settings
Jumper Setting Description
J3 removed
J18 1-2 MCLK = on-board
J15 1-2 DIN = on-board
J17 1-2 BCLK = on-board
J16 1-2 WCLK = on-board
J20 1-2 SDA = USB
J19 1-2 SCL = USB
J27 inserted P0 = 0, select USB for on-board digital audio
J26 inserted P1 = 0, select USB for on-board digital audio
J25 removed Enable on-board digital audio
J30 inserted IOVDD = on-board 1.8 V
J4 inserted DVDD current measurement header
J7 inserted IOVDD current measurement header
J6 inserted AVDD current measurement header
J10 removed MOSI not used
J14 removed IRQ not used
J9 removed SS not used
J11 inserted ADR1 = 0, select 0x98 for the TAS2555 I2C address
J12 inserted ADR0 = 0, select 0x98 for the TAS2555 I2C address
J13 inserted SPI-SEL = 0, select I2C as the control interface
J24 inserted WP = 1, write protect the EEPROM
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www.ti.com Digital Audio Interfaces
5. Verify that the EVM is the default playback device by opening the sound dialog from the Windows
Control Panel as shown in Figure 2.
Figure 2. Setting Default Playback Device
6. Check if the sampling rate matches the Windows setting by opening Properties > Advanced. The EVM
firmware enumerates as a USB-miniEVM that supports 48-kHz sampling rate by default. This setting
must match the EVM at 2 channel, 16 bit, 48000 Hz (CD Quality).
5 Digital Audio Interfaces
The various digital audio interfaces on the TAS2555EVM can be selected through hardware settings and
software settings. Several headers close to the TAS2555 device allow access to the following digital audio
signals:
• J3: Data out (DOUT) from the TAS2555 (for example, current and voltage sense data)
• J15: Data in (DIN) to the TAS2555
• J16: Word clock or frame sync (WCLK)
• J17: Bit clock (BCLK)
• J18: Master clock (MCLK) — optional if TAS2555 PLL is not used
J3 has two pins:
• Digital data (for example, I and V sense data) from the TAS2555 device
• Ground
J15, J16, J17, and J18 have three pins:
• Digital audio signals from the EVM
• Digital audio signals to the TAS2555
• Ground
A jumper inserted in position 1-2 connects the TAS2555 to the digital audio signals from the board (for
example, USB or Learning Board 2).
Replacing the jumper with a connector from an external source connects the TAS2555 to the external
source (for example, AP or PSIA).
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Digital Audio Interfaces www.ti.com
The selection between the two on-board digital audio sources (USB or Learning Board 2) is controlled by:
(a) Hardware: J26, J27
• J26 = inserted, J27 = inserted; selects USB
• J26 = inserted, J27 = removed; selects Learning Board 2
(b) Software: The PPC3 GUI controls the digital audio routing during speaker characterization. This has
priority over the hardware settings from point a.
The secondary digital audio interface from the TAS2555 device is directly available through J5.
5.1 Digital Audio Interface Selection
5.1.1 USB
The TAS2555EVM contains a microcontroller (TAS1020B) that acts as a USB HID and USB-class audio
interface. To select USB, insert both J26 and J27 and insert J15, J16, J17, and J18 in the 1-2 position.
This is shown in Figure 3.
Figure 3. USB Audio Selection
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www.ti.com PurePath Console 3 Software
5.1.2 Direct (AP/PSIA)
Remove the jumpers from J15, J16, J17, and J18 and connect the external digital audio source (for
example, AP or PSIA) to pin 2 of each header. Pin 3 provides a convenient ground connection. This is
shown in Figure 4.
Figure 4. Direct (AP/PSIA) Audio Selection
6 PurePath Console 3 Software
The graphical user interface software, PurePath Console 3, controls the TAS2555EVM.
NOTE: The TAS2555 device needs to be configured using this software. It will not function without
configuration.
Please refer to the TAS2555 SmartAmp Tuning Guide (SLOU423) for detailed information about this
software and how to configure the TAS2555 device for SmartAmp Speaker Protection.
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Stereo www.ti.com
7 Stereo
The TAS2555EVM supports stereo mode (dual mono mode) through J21 and J22 and an optional stereo
adapter board or stereo ribbon cable.
Connect two TAS2555EVMs together side by side as shown in Figure 5.
Figure 5. Stereo Mode Using Two TAS2555EVMs
The top board is the left channel board. The other board is the right channel board and must be
configured to use the control interface from the left channel board. The TAS2555 on the left channel board
uses device address 0x98 and the TAS2555 on the right channel board uses device address 0x9A.
Remove the jumpers from J12 (ADR0), J19 (SCL), and J20 (SDA) on the right channel board.
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