User`s Manual USB 2.0 Audio PCA with 16 Bit I/O, 4 x 4 Audio Mixer
Contents
1. Dee Technology Inc User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Part No 10516 Document No MAN10516 Revision A Date 16SEP10 eMDee Technology Inc www emdee com Dee Technology Inc Document No MAN10516 Table of Contents O A ON 3 11 Block Diagraieceireaiso a EEEE EE EA REE ines AE ee Neen 3 1 2 Theoy of Operat OM soriana Erica 4 PARA A a a DAA a E a a aa aaia 4 1 2 2 Microphone Pre aMplitl rs vesiesccscassscessreseasaes cossces seaetcvbasansnsavagwbasiddscdannhveededeebenvelduahbenwedacnseannecteddddcesass 4 1 2 3 Headphone Speaker Amplifiers cccceccccccceeeeeeeeeeeeeeeegececencaeeeeeeeeeeeeeeeeesdsedeeecieenceeeeeeeseeseeeees 5 Te 2 4 AUCIO SS 5 1 2 5 General Purpose VO GPIO iiicocionsin nr ARRE EEEREN ERANA EN AAAA EEE REN 6 20 Hardware Configuration tacos dc EEEE E SEARA 7 2A Jumper Configura Sica deed cated eek aio Das EA 7 2 1 1 Ground Connections J1 Jumper DescriptiON ooooooccccnnnncccccnnnnncccccnnnononancnnnnnnnnnn cnn nrnnnn nn cnn rra 8 2 1 2 Mic Bias Power J7 Jumper DescriptiON ooooocccccnnnnccccccnonnnonccnccnnnonoconnnnnnncnnnnnnnnnnccnnnnnnnn nc nn nn nn nn nn nnnns 8 2 1 3 Board Power J8 Jumper DescriptiON oooononocccnnnnncoccccccnnnoncconononnnnncnnnnnnnnncnnnnnnnnnn cnn nn naar nn cnn nnnnnnnnnnns 8 2 1 4 Input Gain J10 J13 J17 J22 Jumper DescriptiOM oooooooococccnncccccccnccnnananononnnncnnnnnnnncnnnnnnnnnnnnn2. 12dB 24dB 36dB 2 1 5 Output Gain J12 J18 J19 J20 Jumper Description The output gain jumpers J12 J18 J19 J20 set the gain of the output power amplifiers refer to Fig 1 3 The gain can be set from 0dB to 16dB The following table shows the jumper settings for the valid gain settings of the output amplifier Jumper Location Gain cas 0dB ea 11dB 16dB User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 9 of 26 MDee Technology Inc Document No MAN10516 2 2 External Connectors 2 2 1 J9 J14 J15 J16 Pinout The connectors J9 J14 J15 and J16 are provided for connection of a potentiometer to create a voltage divider between the mixer output and amplifier input so that the output signal can be varied with an external control The potentiometer should be connected so that the wiper is connected to pin 2 and the ends of the potentiometer are connected to pins 1 and 3 so that when the potentiometer is turned completely clockwise the resistance between pin 1 and 2 will be 0 ohms If no external volume control is needed you can simply insert a jumper between pins 1 and 2 to connect the full signal to the output amplifier Mixer Output 1 Amplifier Input 2 Analog Ground 3 2 2 2 J5 Pinout GPIO Bit 0 1 2 GPIO Bit 1 GPIO Bit 2 3 4 GPIO Bit 3 Digital Ground 5 6 Digital Groun
3. 8 UsbGetinputLevel inini annia a aE aE a aa aaa a aaa aaa paaa aeaa a A iaaa aaia 22 4 9 UsbGetOutp tL vel s aison aenean aan aana e aa a aaa ARA a e a eaa Na aE 23 4 10 UsbGetOutputBalance cccccccceeccccecceceeeeeceeeeeeeeteeaaaaaaeaaeaeaaeneeeeeseeeeeesesaaaaacsaceaeaaeseeeeeseneeeeeeeeeaaaaees 24 4 1 1 UsbGetBoardSchemMa isei a A aa aaae iaa aaa aaae aeia aeee 25 5 0 initialization Proced Osio a a aa a a ath iiai edda 26 User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 2 of 26 amp MDee Technology Inc Document No MAN10516 1 0 Overview This document describes the characteristics configuration and operation of eMDee Technology part number 10516 USB 2 0 Audio PCA with 16 Bit I O and 4 x 4 Mixer Sections 1 and 2 of this document describe the hardware and its configuration Sections 3 4 and 5 describe the software drivers API functions and basic initialization 1 1 Block Diagram Figure 1 1 shows a basic block diagram of the circuit board functionality The main components of the board are the USB audio CODEC microphone pre amplifiers headphone speaker amplifiers mixer and general purpose 1 0 GPIO PTT DETECT Figure 1 1 Block Diagram User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 3 of 26 EM Dee Technology Inc Document No MAN10516 1 2 Theory of Operation 1 2 1 USB Audio CODEC The main component of the circuit
4. Page 17 of 26 amp MDee Technology Inc Document No MAN10516 4 4 Usbl2CRead int Usbl2cRead UAC_HANDLE devHandle unsigned short address char data unsigned short length Return Value Macro Value Description UACI2C_OK 0 Successful UACI2C_NOT_CONNECTED 1 Device not connected UACI2C_GENERAL_ERROR 2 Undefined Generic error UACI2C_BUSY 3 Device is busy UACI2C_TIMEOUT 4 Device timed out UACI2C_NO_ACK 5 No response from device UACI2C_NO_DATA 6 No data from device Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen address Address of the I O bank to write to Each I O bank contains two 8 bit bytes Refer to the Remarks section for details of the valid I O banks for this board data A pointer to two 8 bit bytes of data that will receive the data from the I O bank length The number of bytes that are allocated in the data array for this board the value should always be 2 Remarks Use this function to read from the general purpose I O GPIO On this board there are 12 bits of GPIO Each of these bits can be configured as either input read or output write To configure a bit as an input you must first write a 1 to that bit to enable it as an input bit These bits will be latched in there is no need to re write the bits before each read For example to configure GPIO bits 0 3 6 and 9 as inputs use UsbI2CWrite to send 49h 0100 1001b and
5. board is the Micronas UAC3576B CODEC This CODEC provides a USB interface stereo audio input ouptut and an I C interface The CODEC is compatible with the default Windows audio drivers and appears as a USB sound device when connected to a Windows PC Windows XP with Service Pack 2 or higher is recommended 1 2 2 Microphone Pre amplifiers The board has the capability to connect up to four microphones as independent audio inputs The board s pre amplifiers are compatible with dynamic microphones and electret style microphones When using electret style microphones a bias voltage can be configured to power the microphone elements Figure 1 2 shows a simplified block diagram of one of the microphone pre amplifiers on the board Dynamic Mic x Input Mic Bias 0 dB 40 dB to Dynamic Mic x Input PS 2 RA _ 36dB Dynamic Mic x Input o E d A E gt O Amplified Mic x PTT Sense gt PTT x Detect When using a dynamic microphone you connect the two wires from the microphone to the first stage of the pre amplifier This first stage has differential inputs and has a gain of 40dB The connection between the first and second stages of the pre amplifier is not connected by default so you will need to place a jumper between the two stages when using a dynamic microphone see Section 2 2 3 for connector pinouts Electret Mic x Input Figure 1 2 Microphone Input Block Diagram When using an electret style microphone yo
6. function to set the input volume level of the audio CODEC This function can be used to control the overall level of the audio signals that will be captured by the CODEC User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 19 of 26 amp MDee Technology Inc Document No MAN10516 4 6 UsbOutputLevel int UsbOutputLevel UAC_ HANDLE devHandle float level Return Value Macro Value Description UACI2C_OK 0 Successful UACI2C_NOT_CONNECTED 1 Device not connected UACI2C_GENERAL_ERROR 2 Undefined Generic error UACI2C_BUSY 3 Device is busy UACI2C_TIMEOUT 4 Device timed out UACI2C_NO_ACK 5 No response from device UACI2C_NO_DATA 6 No data from device Parameters devHandle Handle of an open USB device retrieved from Usbl2COpen level A normalized value from 0 0 to 1 0 that represents the volume level of the output A value of 0 0 will be minimum volume and a value of 1 0 will be maximum volume Remarks Use this function to set the output volume level of the audio CODEC This is the overall volume level of both channels of the CODEC This function in combination with UsbOutputBalance can be used to set the level of the left and right output channels of the CODEC User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 20 of 26 Dee Technology Inc Document No MAN10516 4 7 UsbOutputBalance int UsbOutputBalance UAC_HANDLE devHandle flo
7. read the default value of the CODEC after initialization or to verify the value written from a call to UsbOutputBalance User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 24 of 26 EM Dee Technology Inc Document No MAN10516 4 11 UsbGetBoardSchema int UsbGetBoardSchema UAC_HANDLE devHandle Return Value The value of the board schema see Remarks Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen Remarks Use this function to retrieve the schema value of the circuit board hardware This value is hard wired as 1 and represents the current and only revision level of the hardware This function is provided so that the same software can be used for different versions of hardware User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 25 of 26 amp MDee Technology Inc Document No MAN10516 5 0 INITIALIZATION PROCEDURE To initialize the board and get it ready for use 1 Call UsbI2COpen and save the returned value as the handle to the open device 2 optional Call UsbGetInputLevel to retrieve the CODEC left and right channel input volume settings 3 optional Call UsbGetOutputLevel and UsbGetOutputBalance to retrieve the CODEC output volume and pan settings 4 Call UsbI2CWrite to address 0x20 with bytes FFh and OFh This will enable the four output amplifiers and configure GPIO bits 0 through 12 as inputs refer to the UsbI2CRead documen
8. see Sec 2 1 5 J18 Output 2 Gain see Sec 2 1 5 J19 J20 Output 3 Gain see Sec 2 1 5 Output 4 Gain see Sec 2 1 5 User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 7 of 26 MDee Technology Inc Document No MAN10516 2 1 1 Ground Connections J1 Jumper Description Jumper J1 provides the ability to connect the circuit board ground planes The three ground planes are e Chassis Ground USB connector shell and mounting screws e Analog Ground Ground reference for all audio amplifiers and mixers e Digital Ground Ground reference for USB CODEC and digital I O The following table shows the jumper pins with a description of each pin Chassis Ground 1 2 Digital Ground Analog Ground 3 4 Digital Ground not used 5 6 not used 2 1 2 Mic Bias Power J7 Jumper Description Jumper J7 along with connector J6 provides the ability to configure the power source for the microphone bias voltage that can be used to power electret style microphones The following table shows the jumper pins with a description of each pin Mic Bias 1 2 Analog 5VDC Analog Ground 3 4 n c This jumper connector allows for several different modes of power the mic bias e Leave all pins of J7 unconnected open and connect an external 12VDC power supply to J6 in this mode DO NOT jumper any of the J7 pins e Connect an external 12VDC power su
9. 02h 0000 0010b to the I O bank at address 20h Then perform a UsbI2CRead to read from the same I O bank to get the value of the bits configured as input Since the inputs are active low an input that is connected to ground will read back as a 0 on that bit Note that bits 4 7 of byte 1 are reserved for shutdown control of the amplifiers These bits must always be written as 0 when configuring the GPIO A 1 written to these bits will put the amplifier in shutdown mode User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 18 of 26 amp MDee Technology Inc Document No MAN10516 4 5 UsbinputLevel int UsbInputLevel UAC_HANDLE devHandle float level int leftOrRight Return Value Macro Value Description UACI2C_OK 0 Successful UACI2C_NOT_CONNECTED 1 Device not connected UACI2C_GENERAL_ERROR 2 Undefined Generic error UACI2C_BUSY 3 Device is busy UACI2C_TIMEOUT 4 Device timed out UACI2C_NO_ACK 5 No response from device UACI2C_NO_DATA 6 No data from device Parameters devHandle Handle of an open USB device retrieved from Usbl2COpen level A normalized value from 0 0 to 1 0 that represents the volume level of the input A value of 0 0 will be minimum volume and a value of 1 0 will be maximum volume leftOrRight Writes level to the left or right channel based on the following values 0 Left CODEC channel 1 Right CODEC channel Remarks Use this
10. ard such as an external PTT switch or selection switch There are 16 GPIO bits of which 12 can be used for general purpose and 4 are reserved for controlling the shutdown function for each of the output amplifiers The GPIO pins are configurable as inputs or outputs and each bit can be configured separately as an input or an output Refer to Section 2 2 2 for details on connecting components to the GPIO pins Also refer to Section 4 3 for details on the software control of the GPIO User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 6 of 26 Dee Technology Inc Document No MAN10516 2 0 Harpware CONFIGURATION This section describes how to configure the hardware for the various functions of the board and details the connectors that are available to external components Figure 2 1 shows the physical layout of the circuit board identifying the jumper locations and external connector locations j J14 J15 e J16 ry Figure 2 1 Jumper and Connector Locations 2 1 Jumper Configurations J18 J22 Jumper Function J1 Ground Connections see Sec 2 1 1 J7 Mic Bias Power see Sec 2 1 2 J8 Board Power see Sec 2 1 3 J10 Input 1 Gain see Sec 2 1 4 J13 Input 2 Gain see Sec 2 1 4 J17 J22 Input 3 Gain see Sec 2 1 4 Input 4 Gain see Sec 2 1 4 J12 Output 1 Gain
11. at fPan Return Value Macro Value Description UACI2C_OK 0 Successful UACI2C_NOT_CONNECTED 1 Device not connected UACI2C_GENERAL_ERROR 2 Undefined Generic error UACI2C_BUSY 3 Device is busy UACI2C_TIMEOUT 4 Device timed out UACI2C_NO_ACK 5 No response from device UACI2C_NO_DATA 6 No data from device Parameters devHandle Handle of an open USB device retrieved from Usbl2COpen fPan A normalized value from 1 0 to 1 0 representing the balance or pan of the output A value of 1 0 will pan the output completely to the left channel and a value of 1 0 will pan the output completely to the right channel The value is continuous between 1 0 and 1 0 with a value of 0 0 being the center equal volume to both left and right channels Remarks Use this function to set the output balance of the audio CODEC This is the pan position for the audio signals being sent from the audio CODEC This function in combination with UsbOutputLevel can be used to set the level of the left and right output channels of the CODEC User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 21 of 26 Dee Technology Inc Document No MAN10516 4 8 UsbGetinputLevel float UsbGetInputLevel UAC_HANDLE devHanale int leftOrRight Return Value The input level that is currently set for the audio CODEC Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen
12. d GPIO Bit 4 7 8 GPIO Bit 5 GPIO Bit 6 9 10 GPIO Bit 7 Digital Ground 11 12 Digital Ground PTT 1 Detect 13 14 GPIO Bit 8 PTT 2 Detect 15 16 GPIO Bit9 Digital Ground 17 18 Digital Ground PTT 3 Detect 19 20 GPIO Bit 10 PTT 4 Detect 21 22 GPIO Bit 11 Digital Ground 23 24 Digital Ground User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 10 of 26 EM Dee Technology Inc Document No MAN10516 2 2 3 J11 Pinout Dynamic Mic 1 Input Electret Mic 1 Input 2 Dynamic Mic 1 Input 4 Analog Ground 6 Analog Ground 8 Electret Mic 2 Input Dynamic Mic 1 Input xau a Dynamic Mic 2 Input Dynamic Mic 2 Input 9 10 Analog Ground Dynamic Mic 2 Input 11 12 Analog Ground Dynamic Mic 3 Input 13 14 Electret Mic 3 Input Dynamic Mic 3 Input 15 16 Analog Ground Dynamic Mic 3 Input 17 18 Analog Ground Dynamic Mic 4 Input 19 20 Electret Mic 4 Input Dynamic Mic 4 Input 21 22 Analog Ground Dynamic Mic 4 Input 23 24 Analog Ground 2 2 4 J21 Pinout Headphone 1 Output 2 Speaker 1 Output 4 Speaker 1 Output Un amplified 1 Output 6 Analog Ground Headphone 2 Output 8 Speaker 2 Output Analog Ground 9 10 Speaker 2 Output Un amplified 2 Output 11 12 Analog Ground Headphone 3 Output 13 14 Speaker 3 Output Analog Ground 15 16 Speaker 3 Output Un amplified 3 Output 17 18 Ana
13. e I O bank length The number of bytes that are allocated in the data array for this board the value should always be 2 Remarks Use this function to write to the general purpose I O GPIO and mixer control The I O arrangement for this board is 3 I O banks each with 16 bits The table below shows the assignment of each bit within the I O banks Address Byte Bit Function 20h 0 0 GPIO Bit 0 J5 pin 1 1 GPIO Bit 1 J5 pin 2 2 GPIO Bit 2 J5 pin 3 User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 15 of 26 EM Dee Technology Inc Document No MAN10516 Address Byte Bit Function GPIO Bit 3 J5 pin 4 GPIO Bit 4 J5 pin 7 GPIO Bit 5 J5 pin 8 GPIO Bit 6 J5 pin 9 GPIO Bit 7 J5 pin 10 GPIO Bit 8 J5 pin 14 GPIO Bit 9 J5 pin 16 GPIO Bit 10 J5 pin 20 GPIO Bit 11 J5 pin 22 Channel 1 Output Amplifier Shutdown Channel 2 Output Amplifier Shutdown Channel 3 Output Amplifier Shutdown Channel 4 Output Amplifier Shutdown 21h 0 Mixer Control Input 1 to Output 1 Mixer Control Input 2 to Output 1 Mixer Control Input 3 to Output 1 Mixer Control Input 4 to Output 1 Mixer Control Input 1 to Output 2 Mixer Control Input 2 to Output 2 Mixer Control Input 3 to Output 2 Mixer Control Input 4 to Output 2 1 Mixer Control Input 1 to Output 3 Mix
14. er Control Input 2 to Output 3 Mixer Control Input 3 to Output 3 Mixer Control Input 4 to Output 3 Mixer Control Input 1 to Output 4 Mixer Control Input 2 to Output 4 Mixer Control Input 3 to Output 4 Mixer Control Input 4 to Output 4 22h 0 Mixer Control CODEC Left Output to Output 1 Mixer Control CODEC Right Output to Output 1 Mixer Control CODEC Left Output to Output 2 Mixer Control CODEC Right Output to Output 2 Mixer Control CODEC Left Output to Output 3 BILWINI A OINI OI ASR WLM A _OI INI OI 01 A 0O0 NN A OINI AOAI 010 A 0 N 2 0O0 In oa oa AITO User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 16 of 26 Dee Technology Inc Document No MAN10516 Address Byte Bit Function 5 Mixer Control CODEC Right Output to Output 3 6 Mixer Control CODEC Left Output to Output 4 7 Mixer Control CODEC Right Output to Output 4 1 0 Mixer Control Input 1 to CODEC Left Input 1 Mixer Control Input 2 to CODEC Left Input 2 Mixer Control Input 3 to CODEC Left Input 3 Mixer Control Input 4 to CODEC Left Input 4 Mixer Control Input 1 to CODEC Right Input 5 Mixer Control Input 2 to CODEC Right Input 6 Mixer Control Input 3 to CODEC Right Input 7 Mixer Control Input 4 to CODEC Right Input User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer
15. ess Physical address of the USB device The physical address of this board is always 0 Remarks Use this function to open a USB device and retrieve a handle to it User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 13 of 26 amp MDee Technology Inc Document No MAN10516 4 2 UsbI2CClose void Usbl2cClose HANDLE devHanadle Return Value None Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen Remarks Use this function to close the USB device and release the driver User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 14 of 26 amp MDee Technology Inc Document No MAN10516 4 3 Usbl2CWrite int Usbl2cWrite UAC_HANDLE devHandle unsigned short address char data unsigned short length Return Value Macro Value Description UACI2C_OK 0 Successful UACI2C_NOT_CONNECTED 1 Device not connected UACI2C_GENERAL_ERROR 2 Undefined Generic error UACI2C_BUSY 3 Device is busy UACI2C_TIMEOUT 4 Device timed out UACI2C_NO_ACK 5 No response from device UACI2C_NO_DATA 6 No data from device Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen address Address of the I O bank to write to Each I O bank contains two 8 bit bytes Refer to the Remarks section for details of the valid I O banks for this board data A pointer to two 8 bit bytes of data that will be written to th
16. hat a device named eMDee Composite USB Device 0 is listed under Universal Serial Bus controllers To verify the proper installation of the audio drivers open the Sounds and Audio Devices Properties Control Panel window and verify that eMDee Audio 0 is available as one of the sound devices in your system To finalize the driver installation and setup you will need to copy the file uac2 dll into your Windows System folder At this point the USB device is ready for communication The following section details how to interface to the USB device through your own customized software application User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 12 of 26 Dee Technology Inc Document No MAN10516 4 0 SOFTWARE INTERFACE The following sections detail the software interface or API that is available for this board All of these functions are available in the dynamically linked library DLL named Usbl2C dll Prototypes for each function are provided in a header file named Usbl2CInterface h For proper operation the USB device drivers must be loaded properly see Section 3 1 and the files uacb dll and uac2 dll must be in the Windows system directory 4 1 UsbI2COpen UAC_HANDLE Usbl2cOpen int devAddress Return Value If successful this function returns a handle to an open USB device that will be used as a reference in subsequent function calls If not successful this function returns NULL Parameters devAddr
17. leftOrRight Reads the input level from the left or right channel based on the following values 0 Left CODEC channel 1 Right CODEC channel Remarks Use this function to retrieve the input volume level of the audio CODEC This function can be used to read the default levels of the CODEC after initialization or to verify the value written from a call to UsbInputLevel User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 22 of 26 amp MDee Technology Inc Document No MAN10516 4 9 UsbGetOutputLevel float UsbGetOutputLevel UAC_HANDLE devHanale Return Value The output level that is currently set for the audio CODEC Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen Remarks Use this function to retrieve the output volume level of the audio CODEC This function can be used to read the default level of the CODEC after initialization or to verify the value written from a call to UsbOutputLevel User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 23 of 26 EM Dee Technology Inc Document No MAN10516 4 10 UsbGetOutputBalance float UsbGetOutputBalance UAC_HANDLE devHandle Return Value The output balance that is currently set for the audio CODEC Parameters devHandle Handle of an open USB device retrieved from UsbI2COpen Remarks Use this function to retrieve the output balance of the audio CODEC This function can be used to
18. log Ground Headphone 4 Output 19 20 Speaker 4 Output Analog Ground 21 22 Speaker 4 Output Un amplified 4 Output 23 24 Analog Ground Analog Ground NN Oo oo User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 11 of 26 Dee Technology Inc Document No MAN10516 3 0 Sortware Drivers The following sections detail the procedures for installing the Windows multimedia drivers and the special purpose board drivers These procedures should be followed before attempting to use the board 3 1 Windows Audio Drivers When the USB audio device is plugged in Windows will automatically detect the USB CODEC and will load default sound drivers for it 3 2 Driver Installation After the USB device has been plugged in and Windows has detected the presence of the audio device you will need to finish the installation of the special purpose drivers to finish your installation The drivers are provided with your USB device You will need to run INSTALL EXE to start the automatic installation of the drivers Once the drivers have been installed you will need to unplug the USB device wait a few seconds and the re plug the device or you can hold the reset button down for 2 to 3 seconds This will reboot the device with the newly installed drivers To verify the proper installation of the special purpose drivers open the Device Manager in Windows and verify t
19. ncnnnnnns 9 2 1 5 Output Gain J12 J18 J19 J20 Jumper DescriptiON ooooooncccnnnccnccccnnccnccccccnnonnnncnnrnoccnnnnnncnnnnccnnnnnns 9 2 2 External Connectors ccccccccecccccceceeeeeeeeeeeteaeaeeeeeaeaneeeeceeeeeeeeeeesaaaaaaceasaaaaeeeeeceseseeeeeeeseeeeeeesaaeeeeeeeeesaes 10 2 2 1 JO 314 315 J16 Pinout 2 2 ee ceeeeceeee ence c cece eee e eee eee eae aaeeeeeeeeceeeeeeeeecesaaaaaaaeeaeeeeeeeeeeeaeeeeeeeeeeeees 10 222 AD PIQUE rt eri 10 22 E O ON 11 PA N A PQQ gic EE leech ay ca bev autan cadets A O A EAA E 11 3 0 SoftWare Drivers ecos a a andadas canada 12 3 1 Windows Audio DIiVeIS ccccccccccceeeeeeeeeteceeeceeeaaeeeeeeeeeeeeeeeeeeecaeeaeaeaeaaaeeeeeeeeeeeeeeeeeeesecececeicaneeeeeeeeeeseeeas 12 3 2 Driver Instalatii enian ai aae a aa inae aE EE a A a E Ea a a aA REA 12 A 0 Software Interface niana kaanin eaaa dette Vana duiens aaa Aaa aaaea aa aE aiaia a aaa AERE aE 13 4 1 USbIZ COPS MN sis is O 13 4 2 USDIZCCIOSC i2ssteeectvexveisencitestbaasaniagsteuacacechs eaapaneushonges aa aaa e a aea aaa aa a Ea Ea Eaa paaa a eaaa aan aeiia 14 4 3 USbIZCWITE vices cicecsSinasadecshcks apacanehbiengaevunabnayedneasaanagecedh aches adecphesaendtungeatengtedshas nea Tea aaea aan aaa TEA A DEES 15 A A 18 4 5 UsbinpuiL Velar ciones A aeaa E eaaa i aada 19 4 6 UsbOutputllevel coronario dana eaa aa aa Ra a aaea aaa aaa A aa anai aaea a a a Traa aE a dica AE ae 20 4 7 UsbOutpuiBalanCE ciaci n ciclo Aa aa Eaa iE 21 4
20. pply to pins 1 and 3 of J7 in this mode DO NOT connect anything to J6 e Place a jumper between pins 1 and 2 to connect board power 5VDC to the mic bias in this mode DO NOT connect anything to J6 e f no microphone bias voltage is needed do not jumper or connect anything to J6 or J7 2 1 3 Board Power J8 Jumper Description Jumper J8 provides the ability to configure the main source of power for the circuit board The following table shows the jumper pins with a description of each pin USB Power 5VDC 2 Board Power Digital Ground 3 4 Board Power User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 8 of 26 EM Dee Technology Inc Document No MAN10516 This jumper connector allows for two different modes of powering the circuit board e Place a jumper between pins 1 and 2 to power the board from the USB bus power in this mode DO NOT connect a jumper between pins 3 amp 4 e Connect an external 5VDC power supply to pins 3 and 4 in this mode DO NOT connect a jumper between pins 1 and 2 2 1 4 Input Gain J10 J13 J17 J22 Jumper Description The input gain jumpers J10 J13 J17 J22 set the gain of the second amplifier stage refer to Fig 1 2 2 of the microphone inputs The gain can be set from OdB to 36dB in 12dB increments The following table shows the jumper settings for the valid gain settings of the input amplifier Jumper Location Gain 0dB
21. r Amplifiers The board has the capability to connect up to four headphones or speakers as independent audio outputs Each output has a power amplifier that is capable of producing up to 1 2W into an 8 ohm load Figure 1 3 shows a simplified block diagram of one of the output amplifiers on the board 0 dB to 16dB Gj ETT h Headphone Output x Shutdown x V Speaker Output x Figure 1 3 Headphone Speaker Output Block Diagram Mixer Output x C The output of the mixer is routed to a three pin connector that can be used for external volume control of the output audio signal Typically a potentiometer is connected to the three pins to provide a voltage divider into the input of the amplifier to vary the output signal If no volume control is needed you may also insert a jumper between pins 1 and 2 of the connector to connect the full scale signal to the amplifier Refer to Section 2 2 1 for details on these connectors The output amplifier is also gain adjustable from 0 to 16dB Refer to Section 2 1 5 for details on configuration of the output amplifier gain jumpers The output of the amplifier can be connected to a headphone or speaker The headphone is connected between one half of the amplifier and ground while the speaker is connected to two bridged amplifiers to provide more output power Refer to Section 2 2 4 for details on connecting headphones and or speakers to the board 1 2 4 Audio Mixer The
22. re is a 6 input 6 output mixer on the board that routes all of the audio to from the inputs outputs and the CODEC This is a simple mixer and contains only on off controls for inputs to outputs and does not provide for individual volume control of the various mixer paths It does however mix the audio signals together so that more than one audio signal can be combined into an output The 6 inputs to the mixer are the 4 microphone inputs plus the left and right outputs of the CODEC Note that the outputs of the CODEC are connected to the inputs of the mixer This enables audio that is played from the CODEC to be sent to any of the mixer outputs The 6 outputs from the mixer are the 4 headphone speaker outputs plus the left and right inputs of the CODEC Note that the outputs of the mixer are connected to the inputs of the CODEC This enables audio from any of the microphones to be sent to the CODEC The mixer is controlled through a software interface that enables disables the various paths that connect inputs to outputs within the mixer Section 4 3 details a map of the controls that are available in the mixer and how to call the API function to enable disable the controls User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 5 of 26 EM Dee Technology Inc Document No MAN10516 1 2 5 General Purpose I O GPIO A bank of discrete I O pins are available on the board so that external devices can be connected to the bo
23. tation in section 4 4 for details on configuring the GPIO bits as outputs The board is now ready for general use You can record from and playback to the CODEC device just as you would any standard Windows audio device Refer to the UsbI2CWrite documentation in section 4 3 for details on how to route and mix the CODEC audio to the outputs and the audio inputs to the CODEC Before exiting your application call UsbClose with the handle to the open device to release the driver User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 26 of 26
24. u connect the signal wire from the microphone to the second stage of the pre amplifier and the ground wire to analog ground In this case it is not necessary to physically connect the first and second amplifier stages If the microphone requires a bias voltage there are several ways to connect this voltage to the microphone signal line Refer to Section 2 1 2 for details on configuring a bias voltage The second stage of the pre amplifier is a variable gain amplifier that is jumper selectable from OdB to 36dB Refer to Section 2 1 4 for details on setting the gain jumpers for the second amplifier stage Also provided in the microphone pre amplifier is a push to talk PTT detection circuit for certain types of microphones The proper operation of this circuit will require an electret style microphone that uses a bias voltage to power the mic element the PTT detection circuit will not work with any other type of microphone The PTT detection circuit monitors the voltage on the microphone signal line and generates a signal to the GPIO when the bias voltage drops below a certain level indicating that the microphone has been activated In order to read the PTT in this manner you will also need to place jumpers see Sec 2 2 2 to route the signal from the PTT detection circuit to the GPIO User s Manual USB 2 0 Audio PCA with 16 Bit I O 4 x 4 Audio Mixer Page 4 of 26 EM Dee Technology Inc Document No MAN10516 1 2 3 Headphone Speake
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