Texas Instruments TLV320AIC12KEVMB-K User manual

User's GuideSLAU229B – October 2007 – Revised August 2008
TLV320AIC12KEVMB-K and TLV320AIC14KEVMB-K User's
Guide
This user's guide describes the characteristics, operation, and use of evaluation modulesTLV320AIC12KEVMB and TLV320AIC14KEVMB, both as stand-alone and as kits(TLV320AIC12KEVMB-K and TLV320AIC14KEVMB-K). A complete circuit description, schematic diagramand bill of materials are also included.
The following related documents are available through the Texas Instruments web site at www.ti.com .
EVM-Compatible Device Data Sheets
Device Literature Number
TLV320AIC12K/14K SLWS115ETAS1020B SLES025REG1117-3.3 SBVS001TPS767D318 SLVS209SN74LVC125A SCAS290SN74LVC1G125 SCES223SN74LVC1G07 SCES296
Contents1 EVM Overview ............................................................................................................... 32 Analog Interface .............................................................................................................. 33 Digital Interface .............................................................................................................. 44 Power Supplies .............................................................................................................. 65 EVM Operation ............................................................................................................... 66 Kit Operation ................................................................................................................. 77 EVM Bill of Materials ....................................................................................................... 29Appendix A TLV320AIC12KEVMB/14KEVMB Schematic ................................................................. 32Appendix B USB-MODEVM Schematic ...................................................................................... 33
List of Figures
1 TLV320AIC12KEVMB-K/14KEVMB-K Block Diagram .................................................................. 82 Default Software Screen .................................................................................................. 103 Information Tab ............................................................................................................. 124 Sounds and Audio Devices Properties .................................................................................. 135 Preset Configurations ...................................................................................................... 146 Device Controls Tab ....................................................................................................... 157 Control Register 1 Tab .................................................................................................... 168 Control Register 2 Tab .................................................................................................... 179 Control Register 3 Tab .................................................................................................... 1710 Control Register 4 Tab .................................................................................................... 1811 Control Register 5 Tab .................................................................................................... 1812 Control Register 6 Tab .................................................................................................... 19SMARTDM is a trademark of Texas Instruments.I
2
C is a trademark of Koninklijke Philips Electronics N.V.Windows is a registered trademark of Microsoft Corporation.LabView is a trademark of National Instruments.
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13 Command Line Interface Tab ............................................................................................ 2014 File Menu .................................................................................................................... 2115 Options Menu ............................................................................................................... 2116 Help .......................................................................................................................... 22
List of Tables
1 Analog Interface Pinout ..................................................................................................... 32 Alternate Analog Connectors ............................................................................................... 43 Digital Interface Pinout ...................................................................................................... 44 Power Supply Pinout ........................................................................................................ 65 List of Jumpers ............................................................................................................... 76 USB-MODEVM SW2 Settings ............................................................................................. 97 USB Control Endpoint HIDSETREPORT Request .................................................................... 228 Data Packet Configuration ................................................................................................ 239 GPIO Pin Assignments .................................................................................................... 2510 TLV320AIC12KEVMB/14KEVMB Bill of Materials ..................................................................... 2911 USB-MODEVM Bill of Materials .......................................................................................... 30
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1 EVM Overview
1.1 Features
1.2 Introduction
2 Analog Interface
www.ti.com EVM Overview
•Full-featured evaluation board for the TLV320AIC12K/14K audio codec•TLV320AIC12KEVMB-K/14KEVMB-K features USB connectivity for quick and easy setup.•Intuitive evaluation software•Easy interfacing to multiple analog sources•Analog output signals from the TLV320AIC12K/14K are available on top and bottom connectors.•On-board headphone jack, external microphone jack and electret microphone are included•Digital control signals can be applied directly to top and bottom connectors.
The TLV320AIC12KEVMB-K/14KEVMB-K is a complete evaluation/demonstration kit, which includes aUSB-based motherboard called the USB-MODEVM Interface board and evaluation software for use with apersonal computer running Microsoft Windows
®
operating systems. Provisions are made for connecting allaudio inputs and outputs either from the modular connectors or with on-board terminals, a headphonejack, and external microphone jack. An on-board electret microphone is also provided.
For maximum flexibility, the TLV320AIC12KEVMB/14KEVMB is designed for easy interfacing to multipleanalog sources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide aconvenient 10-pin dual row header/socket combination at J1 and J2. These headers/sockets provideaccess to the analog input and output pins of the device. Consult Samtec at www.samtec.com or call1-800-SAMTEC-9 for a variety of mating connector options. Table 1 summarizes the analog interfacepinout for the TLV320AIC12KEVMB/14KEVMB.
Table 1. Analog Interface Pinout
PIN NUMBER SIGNAL DESCRIPTION
J1.1 OUTM1 Inverting output of the DACJ1.2 OUTP1 Noninverting output of the DACJ1.3 OUTMV Programmable virtual ground for the output of OUTP2 and OUTP3J1.4 OUTP2 Analog output number 2 from the 16- Ωdriver
J1.5 OUTMV Programmable virtual ground for the output of OUTP2 and OUTP3J1.6 OUTMV Programmable virtual ground for the output of OUTP2 and OUTP3J1.7 OUTMV Programmable virtual ground for the output of OUTP2 and OUTP3J1.8 OUTP2 Analog output number 3 from the 16- ΩdriverJ1.9 AGND Analog GroundJ1.10 NC Not ConnectedJ1.11 AGND Analog GroundJ1.12 NC Not ConnectedJ1.13 AGND Analog GroundJ1.14 NC Not ConnectedJ1.15 NC Not ConnectedJ1.16 NC Not ConnectedJ1.17 AGND Analog GroundJ1.18 NC Not ConnectedJ1.19 AGND Analog GroundJ1.20 NC Not ConnectedJ2.1 INM2 Inverting analog input 2
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3 Digital Interface
Digital Interface www.ti.com
Table 1. Analog Interface Pinout (continued)
PIN NUMBER SIGNAL DESCRIPTION
J2.2 INP2 Noninverting analog input 2J2.3 NC Not ConnectedJ2.4 NC Not ConnectedJ2.5 NC Not ConnectedJ2.6 NC Not ConnectedJ2.7 INM1 Inverting analog input 1J2.8 INP1 Noninverting analog input 1J2.9 AGND Analog GroundJ2.10 NC Not ConnectedJ2.11 AGND Analog GroundJ2.12 NC Not ConnectedJ2.13 AGND Analog GroundJ2.14 NC Not ConnectedJ2.15 NC Not ConnectedJ2.16 NC Not ConnectedJ2.17 AGND Analog GroundJ2.18 NC Not ConnectedJ2.19 AGND Analog GroundJ2.20 NC Not Connected
In addition to the analog headers, the analog inputs and outputs may also be accessed through alternateconnectors, either screw terminals or audio jacks. The microphone input is also tied to J8 and the headsetoutput tied to J11. Table 2 summarizes the screw terminals available on theTLV320AIC12KEVMB/14KEVMB.
Table 2. Alternate Analog Connectors
DESIGNATOR PIN 1 PIN 2 PIN3
J6 OUTP1 OUTM1J7 OUTP2 OUTMV OUTP3J9 INP2 INM2J10 INM1 INP1
The TLV320AIC12KEVMB/14KEVMB is designed to easily interface with multiple control platforms.Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin dualrow header/socket combination at J4 and J5. These headers/sockets provide access to the digital controland serial data pins of the device. Consult Samtec at www.samtec.com or call 1-800- SAMTEC-9 for avariety of mating connector options. Table 3 summarizes the digital interface pinout for theTLV320AIC12KEVMB/14KEVMB.
Table 3. Digital Interface Pinout
PIN NUMBER SIGNAL DESCRIPTION
J4.1 NC Not ConnectedJ4.2 NC Not ConnectedJ4.3 NC Not ConnectedJ4.4 DGND Digital GroundJ4.5 NC Not Connected
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Table 3. Digital Interface Pinout (continued)
PIN NUMBER SIGNAL DESCRIPTION
J4.6 NC Not ConnectedJ4.7 NC Not ConnectedJ4.8 AIC12K/14K RESET Reset signal input to AIC12K/14KEVMBJ4.9 NC Not ConnectedJ4.10 DGND Digital GroundJ4.11 NC Not ConnectedJ4.12 NC Not ConnectedJ4.13 NC Not ConnectedJ4.14 AIC12K/14K RESET Reset signal input to AIC12K/14KEVMBJ4.15 NC Not ConnectedJ4.16 SCL I
2
C Serial ClockJ4.17 NC Not ConnectedJ4.18 DGND Digital GroundJ4.19 NC Not ConnectedJ4.20 SDA I
2
C Serial Data Input/OutputJ5.1 NC Not ConnectedJ5.2 NC Not ConnectedJ5.3 SCLK Audio Serial Data Shift Clock (Input/Output)J5.4 DGND Digital GroundJ5.5 NC Not ConnectedJ5.6 NC Not ConnectedJ5A.7 FSD Audio Serial Data Bus Frame Sync DelayedJ5B.7 FS Audio Serial Data Bus Frame Sync (Input/Output)J5.8 NC Not ConnectedJ5.9 NC Not ConnectedJ5.10 DGND Digital GroundJ5.11 DIN Audio Serial Data Bus Data Input (Input)J5.12 NC Not ConnectedJ5.13 DOUT Audio Serial Data Bus Data Output (Output)J5.14 NC Not ConnectedJ5.15 NC Not ConnectedJ5.16 SCL I
2
C Serial ClockJ5.17 MCLK Master Clock InputJ5.18 DGND Digital GroundJ5.19 AIC12K/14K PWDN Power down signal input to AIC12K/14KEVMBJ5.20 SDA I
2
C Serial Data Input/Output
Note that J5 comprises the signals needed for a SMARTDM™ serial digital audio interface and I
2
C™signals. The reset and power down ( RESET and PWRDN) signals are routed to J4. I
2
C™ is actuallyrouted from the USB-MODEVM to both connectors; however, the codec and EEPROM are only connectedto J5.
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4 Power Supplies
4.1 Stand-Alone Operation
4.2 USB-MODEVM Interface Power
5 EVM Operation
Power Supplies www.ti.com
J3 provides connection to the common power bus for the TLV320AIC12KEVMB/14KEVMB. Power issupplied on the pins listed in Table 4 .
Table 4. Power Supply Pinout
SIGNAL PIN NUMBER SIGNAL
NC J3.1 J3.2 NC+5VA J3.3 J3.4 NCDGND J3.5 J3.6 AGNDDVDD (1.8V) J3.7 J3.8 NCIOVDD (3.3V) J3.9 J3.10 NC
The TLV320AIC12KEVMB-K/14KEVMB-K motherboard (the USB-MODEVM Interface board) suppliespower to J3 of the TLV320AIC12KEVMB/14KEVMB. Power for the motherboard is supplied either throughits USB connection or via terminal blocks on that board.
When used as a stand-alone EVM, power can be applied to J3 directly. The user must be sure toreference the supplies to the appropriate grounds on that connector.
CAUTION
Verify that all power supplies are within the safe operating limits shown on theTLV320AIC12K/14K data sheet before applying power to the EVM.
The USB-MODEVM Interface board can be powered from several different sources:•USB
•6VDC–10VDC AC/DC external wall supply (not included)•Lab power supply
When powered from the USB connection, JMP6 should have a shunt from pins 1–2 (this is the defaultfactory configuration). When powered from 6V-10VDC, either through the J8 terminal block or the J9barrel jack, JMP6 should have a shunt installed on pins 2-3. If power is applied in any of these ways,onboard regulators generate the required supply voltages and no further power supplies are necessary.
If lab supplies are used to provide the individual voltages required by the USB-MODEVM Interface, JMP6should have no shunt installed. Voltages are then applied to J2 (+5VA), J3 (+5VD), J4 (+1.8VD), and J5(+3.3VD). The +1.8VD and +3.3VD can also be generated on the board by the onboard regulators fromthe +5VD supply; to enable this configuration, the switches on SW1 need to be set to enable theregulators by placing them in the ON position (lower position, looking at the board with text readingright-side up). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placingSW1 switches in the OFF position.
Each power supply voltage has an LED (D1-D7) that lights when the power supplies are active.
This section provides information on the analog input and output, digital control, and general operatingconditions for the TLV320AIC12KEVMB/14KEVMB.
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5.1 Analog Input
5.2 Analog Output
5.3 Digital Control
5.4 Default Jumper Locations
6 Kit Operation
6.1 TLV320AIC12KEVMB-K/14KEVMB-K Block Diagram
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The analog input sources can be applied directly to J2 (top or bottom side). The analog inputs may alsobe accessed through J8 and screw terminals J9 and J10.
The analog outputs from the TLV320AIC12K/14K are available on J1 (top or bottom). They also may beaccessed through J6 and J7 or J11. Note that the TLV320AIC14K only has one (differential) output whichcan be accessed from J1 or screw terminal J6.
The digital control signals can be applied directly to J4 and J5 (top or bottom side). The modularTLV320AIC12KEVMB/14KEVMB can also be connected directly to the USB-MODEVM Interface boardincluded as part of the TLV320AIC12EVMB-K/14EVMB-K. See the product folder for this EVM or theTLV320AIC12K/14K for a current list of compatible interface and/or accessory boards.
Table 5 lists the jumpers found on the EVM and their respective factory default conditions. Please notethat jumper W5 must be set to position 1-2 (IOVDD=3.3V) when using the USB-MODEVM for I
2
Ccommunication.
Table 5. List of Jumpers
DEFAULTJUMPER POSITION JUMPER DESCRIPTION
Sets the codec as master or slave. When set as master (2-3), the codec provides theW1 1-2 digital audio clock signals. When set as slave (1-2), the codec receives the digitalaudio clock signals.Used for correct polarity for FSD. In stand-alone master, FSD must be pulled highW2 1-2
(2-3), In stand alone slave, FSD must be pulled low (1-2).W3 Installed Provides a means of measuring IOVDD currentW4 Installed Provides a means of measuring DVDD currentIOVDD select. Can be set to 3.3V (1-2) or 1.8V (2-3) although 3.3V is required whenW5 1-2
using the USB-MODEVM for I
2
C communication.W6 Installed Selects on-board EEPROM as firmware source (required)When installed, allows the USB-MODEVM to hardware reset the device under userW7 Installed
controlW8 Installed Provides a means of measuring AVDD currentW9 Installed Provides a means of measuring DRVDD currentW10 Installed Coupling for OUTP1. Either directly or via capacitorW11 1-2 Source for INM1. Set to 1-2 when using external common mode for MICINW12 Installed Disconnects electret microphone (MK1)
This section provides information on using the TLV320AIC12KEVMB-K/14KEVMB-K, including set up,program installation, and program usage.
A block diagram of the TLV320AIC12KEVMB-K/14KEVMB-K is shown in Figure 1 . The evaluation kitconsists of two circuit boards connected together. The motherboard is designated as the USB-MODEVMInterface board, while the daughtercard is the TLV320AIC12KEVMB/14KEVMB described previously inthis manual.
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EVM Position 2
EVM Position 1
TLV320AIC12KEVMB/14KEVMB
Control Interface
TAS1020B
USB 8051
Microcontroller
USB
I C
2
SMARTDM
Audio Interface
TLV320AIC12K/14K
Kit Operation www.ti.com
Figure 1. TLV320AIC12KEVMB-K/14KEVMB-K Block Diagram
The USB-MODEVM Interface board is intended to be used in USB mode, where control of the installedEVM is accomplished using the onboard USB controller device. Provision is made, however, for driving allthe data buses (I
2
C, PCM/ SMARTDM™) externally. The source of these signals is controlled by SW2 onthe USB-MODEVM. Refer to Table 6 for details on the switch settings.
Additionally, SW3 on the USB-MODEVM (IOVDD SELECT) must be set up to 3.3V (SW3 position 1 on,SW3 positions 2-8 off).
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6.2 Installation
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Table 6. USB-MODEVM SW2 Settings
SW-2 SWITCH
NUMBER LABEL SWITCH DESCRIPTION
USB-MODEVM EEPROM I
2
C Address A01 A0 ON: A0 = 0OFF: A0 = 1USB-MODEVM EEPROM I
2
C Address A12 A1 ON: A1 = 0OFF: A1 = 1USB-MODEVM EEPROM I
2
C Address A23 A2 ON: A2 = 0OFF: A2 = 1Digital Audio Bus Source Selection4 USB I
2
S ON: Digital Audio Bus connects to TAS1020OFF: Digital Audio Bus connects to USB-MODEVM J14Digital Audio Bus MCLK Source Selection5 USB MCK ON: MCLK connects to TAS1020OFF: MCLK connects to USB-MODEVM J14SPI Bus Source Selection6 USB SPI ON: SPI Bus connects to TAS1020OFF: SPI Bus connects to USB-MODEVM J15RST Source Selection7 USB RST ON: EVM Reset Signal comes from TAS1020OFF: EVM Reset Signal comes from USB-MODEVM J15External MCLK Selection8 EXT MCK ON: MCLK Signal is provided from USB-MODEVM J10OFF: MCLK Signal comes from either selection of SW2-5
For use with the TLV320AIC12KEVMB/14KEVMB, SW-2 positions 1, 3, 4, 5 and 6 should be set to ON,while SW-2 positions 2, 7 and 8 should be set to OFF.
Ensure that the TLV320AIC12KEVMB/14KEVMB is installed on the USB-MODEVM Interface board,aligning J1, J2, J3, J4, J5 with the corresponding connectors on the USB-MODEVM.
Place the CD-ROM into your PC CD-ROM drive. Locate the Setup program on the disk, and start it. TheSetup program will install the TLV320AIC12K/14K Evaluation Tool software on your PC.
The NI-VISA Runtime installer is embedded to the TLV320AIC12K/14K Evaluation Tool installer. Thissoftware allows the program to communicate with the USB-MODEVM.
When the installation completes, click Finish on the TLV320AIC12K/14K Evaluation Tool installer window.You may be prompted to restart your computer.
When installation is complete, attach a USB cable from your PC to the USB-MODEVM Interface board. Asconfigured at the factory, the board will be powered from the USB interface, so the power indicator LEDsand the 'USB ACTIVE' LED on the USB-MODEVM should light.
The Found New Hardware Wizard will show up on the screen. Select the ' No, not this time' radio buttonand click ' Next >'. Select ' Install the software automatically (Recommended)' and click ' Next >'. If thedriver installs correctly the message: ' The wizard has finished installing the software for: AIC12K/14KEVM' should appear. Click ' Finish'. The AIC12K/14K EVM driver should now be installed. The deviceshould now appear on the Device Manager as ' NI-VISA USB Devices>AIC12K/14K EVM' and as ' Sound,video and game controllers>USB Audio Device'.
Once the device drivers are installed launch the TLV320AIC12K/14K Evaluation Tool software on yourPC, located on the computer's desktop or in 'Start>Programs>Texas Instruments'.
The software should automatically find the TLV320AIC12K/14K, and a screen similar to the one inFigure 2 should appear.
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6.3 USB-MODEVM Interface Board
6.4 Program Description
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Figure 2. Default Software Screen
The simple diagram shown in Figure 1 shows only the basic features of the USB-MODEVM Interfaceboard. The board is built around a TAS1020B streaming audio USB controller with an 8051-based core.The board features two positions for modular EVMs, or one double-wide serial modular EVM may beinstalled.
Since the TLV320AIC12KEVMB/14KEVMB is a double-wide modular EVM, it is installed with connectionsto both EVM positions, which connects the TLV320AIC12K/14K digital control interface to the I
2
C portrealized using the TAS1020B, as well as the TAS1020B digital audio interface.
In the factory configuration, the board is ready to use with the TLV320AIC12KEVMB/14KEVMB. To viewall the functions and configuration options available on the USB-MODEVM board, see the USB-MODEVMInterface Board schematic in Appendix B .
After the TLV320AIC12KEVMBK/14KEVMB-K software installation (described in Section 6.2 ) is complete,evaluation and development with the TLV320AIC12K/14K can begin.
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6.5 Indicators and Main Screen Controls
6.6 Information Tab
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Figure 2 illustrates the indicators and the main screen controls near the top of the software screen display,and a large tabbed interface below. This section discusses the controls above this tabbed section.
At the top left of the screen is an Interface indicator. The TLV320AIC12K/14K has an I
2
C interface. Theindicator is lit after the program begins. Below the Interface indicator is the Device Connected indicator.The TLV320AIC12K/14K Evaluation Tool detects whether or not the TLV320AIC12KEVMB-K/14KEVMB-Kis present. If the device is unplugged from the USB port or if the device driver is not installed properly, theDevice Connected indicator will turn red. Otherwise, it will turn green.
To the right of the Interface indicator is a group box called Firmware. This box indicates the productidentification of the USB device, so AIC12K/14K EVM should be displayed in the box labeled LocatedOn:. The version of the firmware appears in the Version box below this.
To the right, the next group box contains controls for resetting the TLV320AIC12K/14K. A software resetcan be done by writing to a register in the TLV320AIC12K/14K; the writing is accomplished by pushing thebutton labeled Software Reset. This button also resets to the default I
2
C address and refreshes the GUI'sregister table and controls/indicators by reading all registers. The TLV320AIC12K/14K also may be resetby toggling a GPIO pin on the USB-MODEVM, which is done by pushing the Hardware Reset button.
CAUTION
In order to perform a hardware reset, the RESET jumper (W7) must be installedand SW2-7 on the USB-MODEVM must be turned OFF. Failure to do either ofthese steps results in not generating a hardware reset or causing unstableoperation of the EVM, which may require cycling power to the USB-MODEVM.
The ADC Overflow and DAC Overflow indicators light when the overflow flags are set in register 1 of theTLV320AIC12K/14K. These indicators, as well as the other indicators on this panel, update only whenwriting or reading registers, on resets or by pushing the Refresh button. The Indicator Updates andControl Updates buttons enable/disable updates of indicators and controls, respectively.
The information tab (Figure 3 ) shows information for two TLV320AIC12KEVMB-K/14KEVMB-K hardwareconfigurations.
The USB-MODEVM Audio Interface Configuration allows audio data and I
2
C communication betweenthe host computer and the TLV320AIC12K/14K. SW2 on the USB-MODEVM must be configured asshown in the left section of Figure 3 .
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Figure 3. Information Tab
Additionally, the operating system's audio device must be configured as AIC12K/14K EVM (see Figure 4 ).
The External Audio Interface Configuration only allows I
2
C communication between the host computerand the TLV320AIC12K/14K. In this configuration, the TLV320AIC12K/14K can transmit and receive audiodata to/from an external PCM device or DSP. SW2 on the USB-MODEVM must be configured as shown inthe right section of Figure 3 .
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6.7 Preset Configurations Tab
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Figure 4. Sounds and Audio Devices Properties
The Preset Configurations tab (Figure 5 ) provides several presets for both the USB-MODEVM AudioInterface Configuration and the External Audio Interface Configuration. Also, there is aTLV320AIC12K/14K Defaults preset which programs the codec's default register settings. When a radiobutton is selected, a detailed description of the preset will appear on the Preset ConfigurationDescription box. To load a preset to the codec, select the desired preset by selecting the correspondingradio button and pushing the Load button. At the same time, this will show the preset's executedcommands on the Command Buffer of the Command Line Interface tab (see Figure 13 ).
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6.8 Device Controls Tab
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Figure 5. Preset Configurations
The Device Controls Tab (Figure 6 ) contains six enumerated Control Registers sub tabs with controlsfor all six registers of the TLV320AIC12K/14K, a register table at the bottom of the tab, several controlsand an indicator at the right of the tab. The 8-bit I
2
C Address indicator shows the current I
2
C address.The Device Position control lets the user select a specific codec on a master-slave chain to write to orread from. The TLV320AIC12KEVMB-K/14KEVMB-K is configured as a stand-alone slave, so the deviceposition must be set to zero. The Program Device button, when pushed, programs the registercorresponding only to the selected Control Registers sub tab. The register table holds the currentregister values in hexadecimal and binary format. The Register Dump to File button dumps the currentregister values to a spreadsheet. Please refer to the TLV320AIC12K/14K datasheet for further details oncontrol register content.
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6.8.1 Control Register 1 Tab
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Figure 6. Device Controls Tab
The Transfer Mode control lets the user select between continuous data transfer mode or programmingmode. In the continuous data transfer mode, only audio data is sent and received through the serial audiobus. In the programming mode, control data is sent and received through the serial audio bus. The DataFormat Mode, if set to 15 bits + 1, allows the codec to run in continuous mode and switch toprogramming mode by setting the LSB of DIN to 1 to send control data. The USB-MODEVM AudioInterface Configuration currently supports continuous and 16-bits audio data transfers. The Mic Bias setsthe voltage of the BIAS pin to 2.35V or 1.35V. The Selected Filter button allows the user to selectbetween an FIR filter or an IIR filter for the decimation/interpolation low-pass filter. The Loopbackswitches toggle the analog or digital loopback on and off. The indicator below each switch will light whenon only if the register data sent by pressing the Program Device button is acknowledged.
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6.8.2 Control Register 2 Tab
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Figure 7. Control Register 1 Tab
The Turbo Mode control (Figure 8 ) sets the SCLK frequency to 16 ×FS ×(number of devices) ×mode orMCLK ÷P, where number of devices is the number of codecs in cascade (default=1) and the mode is 1 forcontinuous data transfer mode and 2 for programming mode. The Host Port Control can be used toassign different functions to the SDA pin or to set SCL and SDA for I2C or S2C. When using theUSB-MODEVM Audio Interface Configuration the Host Port Control must be set to SDA/SCL are I2Cinterface pins.
If the host interface is not needed, the two pins of SCL and SDA can be programmed to becomegeneral-purpose I/Os. If selected to be used as I/O pins, the SDA and SCL pins become output and inputpins respectively, determined by D1 and D0. SDA can then be set to 1 or 0 by toggling the GeneralPurpose Output control.
The Decimation/Interpolation filter bypass button bypasses the filters selected in register 1. This can beuseful when using a DSP to apply such filters. The I
2
C Base Address control allows the user to select thefirst three bits (MSB first) of the device's 7-bit I
2
C address. The last 4 bits of the address will depend onthe automatic cascade detection (ACD) feature of SMARTDM™, which sets the device position.
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6.8.3 Control Register 3 Tab
6.8.4 Control Register 4 Tab
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Figure 8. Control Register 2 Tab
The Control Register 3 Tab (Figure 9 ) allows the user to set the DAC Oversampling Rate (OSR), setthe Asynchronous Sampling Rate Factor and power down the ADC or DAC with the Power DownControls. The indicator below each power down switch will light when on only if the register data sent bypressing the Program Device button is acknowledged. The USB-MODEVM Audio InterfaceConfiguration currently allows a fixed sampling rate and a single codec. For an OSR=256 the value of M,set in register 4, must be a multiple of 2. Similarly, for an OSR=512 the value of M must be a multiple of 4.
Figure 9. Control Register 3 Tab
The Control Register 4 Tab (Figure 10 ) provides controls for P,Nand M. Furthermore, an FS calculatoris provided for convenience. The calculator derives FS from the MCLK frequency entered by the user orloaded by a preset by using the equation: FS=MCLK ÷(16 ×P×M×N). The PLL Method switch illustratesthat for coarse sampling, Pmust be equal to 8. Please note that the FS calculator and the PLL Method
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6.8.5 Control Register 5 Tab
6.8.6 Control Register 6 Tab
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are merely for illustration; what is actually written to registers 4A and 4B are the values of P,Mand Nonly. The USB-MODEVM Audio Interface Configuration is set up for an MCLK=11.2896 MHz, so P,Mand Nmust satisfy the FS equation and the SCLK equation in Turbo Mode for that configuration. If usingthe External Audio Interface Configuration, the divider values can be set to anything specified in theTLV320AIC12K/14K datasheet.
Figure 10. Control Register 4 Tab
The Control Register 5 Tab (Figure 11 ) has several gain controls. The ADC PGA and DAC PGA gainknobs range from -42dB to 20dB and each have a MUTE button. The gain knobs and the respectiveMUTE buttons write to register 5A for the ADC PGA and to register 5B for the DAC PGA. Sliders areprovided for the Input Buffer Gain (0dB to 24dB) and the Digital Sidetone Gain (-21dB to -3dB w/ MUTE)and they both share register 5C. For convenience, the corresponding register for each control is providedto the right of the tab. An 'x' denotes the bits modified by the corresponding control.
Figure 11. Control Register 5 Tab
The Control Register 6 Tab (Figure 12 ) provides controls to select the analog input and to configure theanalog outputs. Note that OUTP2/P3 are only available on the TLV320AIC12/12K. TheTLV320AIC12KEVMB/14KEVMB provides a 1/8" audio jack (J8) to connect a microphone, an on-boardelectret microphone (MK1) and another 1/8" audio jack (J11) to connect a stereo headset. There are fouroptions for the Analog Input Select control:
a. INP/M1 - selects input 1 as the input source (connected to screw terminal J10). To use this mode,jumper W11 must be installed on pins 2-3.b. MICIN self-biased to 1.35V (single-ended) - In this mode, the device internally self-biases the input to1.35V. To use this mode, jumper W11 must be installed on pins 2-3. Jumper W12 must be installed ifusing the on-board electret microphone (MK1), otherwise a microphone can be connected to J8.
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6.9 Command Line Interface Tab
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Please refer to Appendix A for details. Note that the ring contact in J8 is not connected.c. MICIN with external common mode (pseudo-differential) - In this mode, the single ended input isconnected through ac-coupling to MICIN and the bias voltage used to generate the signal is also accoupled to INM1. To use this mode, jumper W11 must be installed on pins 1-2. Jumper W12 must beinstalled if using the on-board electret microphone (MK1), otherwise a microphone can be connected toJ8. Please refer to Appendix A for details. Note that the ring contact in J8 is not connected.d. INP/M2 - selects input 2 as the input source (connected to screw terminal J9).
The Output Configuration control (TLV320AIC12K only) sets outputs OUTP2/P3 to differential orsingle-ended mode. If set to differential, OUTP2 and OUTP3 share pin OUTMV as the common invertingoutput. If set to single-ended, OUTMV becomes a virtual ground for OUTP2/P3 at the common modevoltage of 1.35V. Switch SW2 on the TLV320AIC12KEVMB/14KEVMB can be used to try multiple outputconfigurations on J7 and J11. Please see the Functional Description section on the TLV320AIC12K/14Kdatasheet for details.
The Output Drivers Controls (TLV320AIC12K only) mutes and powers down OUTP2 and/or OUTP3.
Figure 12. Control Register 6 Tab
A simple scripting language controls the TAS1020 on the USB-MODEVM from the LabView™-based PCsoftware. The main program controls, described previously, do nothing more than write a script which isthen handed off to an interpreter that sends the appropriate data to the correct USB endpoint. Becausethis system is script-based, provision is made in this tab for the user to view the scripting commands thatare created as the controls are manipulated, as well as load and execute other scripts that have beenwritten and saved (see Figure 13 ). This design allows the software to be used as a quick test tool or tohelp provide troubleshooting information in the rare event that the user encounters a problem with thisEVM.
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Figure 13. Command Line Interface Tab
A script is loaded into the command buffer, either by operating the controls on the other tabs or by loadinga script file or preset.
When executed, either by loading commands from other tabs, loading a preset or pushing the ExecuteCommand Buffer button, an array containing executed commands will be displayed on the CommandHistory tab. Additionally, the return packet of data which results from the last command executed will bedisplayed in the USB-MODEVM Data Packet tab. The logging function, described below, can be used tosee the results after every executed command.
The File menu (Figure 14 ) provides some options for working with scripts. The first option, OpenCommand File..., loads a command file script into the command buffer. This script can then be executedby pressing the Execute Command Buffer button.
The second option, Save Command File..., saves the contents of the command buffer into a file.
The third option is Log Script and Results..., which opens a file save dialog box. The user can choose alocation for a log file to be written using the file save dialog. When the Execute Command Buffer button ispressed, the script will run and the script, along with resulting data read back during the script, will besaved to the file specified. The log file is a standard text file which can be opened with any text editor, andlooks much like the source script file, but with the additional information of the result of each scriptcommand executed.
The third menu item is a submenu of Recently Opened Files. This list is simply a list of script files thathave previously been opened, allowing fast access to commonly-used script files. The final menu item isExit, which terminates the TLV320AIC12K/14K Evaluation Tool software.
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