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CC8520 Clarification

ionut remus
Prodigy 20 points

Other Parts Discussed in Thread: PCM2706, CC8520, DIR9001, CC8530, CC8531

I want to use the Audio wireless transmision only from the chip! Since i don't have expierience with these kind of chips i have some questions!

 

1. In my country is only available the CC8520 chip, can y configurateit with a PCM2706 for the usb suport and to transmit via I2S the signal to the cc8520 and then to receiveit with another cc8520 and transmit via I2S again to a WM8740?

2. At the WM8740 i have a spidif decoder allready soldered down (DIR9001), is there a problem is i put the I2S output of the CC8520 in parallel with the DIR9001 when the DIR9001 is not functioning cutting only the power to it?

3. Is there really needed to program the chip if i use only the wireless transmision via I2S? (a generic default there is for the chip?) - the debugger is expensive for me if i only want to use-it in only one aplication

4. The pairing button needs to be on the PCB of the transmiter or on the receiver PCB, or Both?

  • 0
    TI__Mastermind 21125 points

    Hi Ionut Remus, 

    1. Yes as long as the WM8740 can be configured using I2C and/or 4 GIO pins. Please note that the CC8520 is limited to two audio (mono) audio channels. 
    2. Have not tried anything like this myself, but if there are not any driving conflicts on the I2S line then I do not see why this should not work.
    3. Yes. The CC8520 is shipped with the flash empty from texas instruments and needs to be programmed by end user, The debugger can be bought stand-alone for $49 here: http://www.ti.com/tool/cc-debugger The PC tool for configuration and programming is free and can be found here: http://www.ti.com/tool/purepath-wl-cfg

    4. Your choice. Either on both sides or only at the receiver side in conjunction with proximity to the master. 

    Hope this helps.
    Regards,

    Kjetil 

  • 0 in reply to Kjetil
    Prodigy 20 points

    OK! thnakyou for the information!

    These days i had a little more time and i studyed every tehnical data i could find about this cip! Initialy i wanted to use only the wireless transmision for my Digital Audio WorkStation but as i read the documents i began having  lots of ideeas to mixup the cip with other (including also the Wi-Fi extender).

    Initialy i didn't want to buy a debugger but as i read and my ideas came to life i decided to by one and also some chips direcly from this site becouse in my country i have only available the cc8520 and cc8530 witch has no suport for USB.

    Questions:

    1. when i decide and make my project i will buy everything from here but since i'm from Romania i want to know how much it costs the transportation?

    2. the CC852X has 2 Mono Channels....what that means? one for left and one for right? there are balanced outputs or unbalanced? i have no expierience in Wi-fi and also the tehnical talk are new for me....

    3. the CC853X has 4 Mono Channels....what that means? 2 for left and 2 for right? there are balanced outputs or unbalanced?

    4. the I2C interface is only for mass production pupuse? I have much expierience with the AVR chips specially with the Atmega32 and Atmega64 and i used them in many project controling with them other chips via I2c, , this can be done also with the CC85XX chips, to be controled via i2c by an AVR microcontroler ? where i can find the I2c specs for controll (the adress of the chip, the adress in binary for all other functions)?

     

  • 0 in reply to ionut remus
    Expert 1720 points

    Hi Remus,

    2. 2 mono channels means, that CC852X can send or receive two audio channels usually left and right 16bit/up to 48kHz. Balanced or unbalanced, it is about analog output or input and CC85XX doesn't include ADC or DAC. There is many options for channel configuration. It is importat specially when you use USB master, where you can select how channels will be visible for operating system. I use Front Left/Right channels, but they can be visible like effect or subwoofer channels. Also you can send audio data from slave to master when you want to have wireless microphones. Wireless protocol is proprietary. It only use same frequency band like WiFi and can coexistent with them.

    3. CC853X have support for 4 channels. It has second DATA wire for I2S bus where are send two additional channels. Bandwidth is not enough for 4 channels, that there is used SLAC (slightly loss audio codec) in a air. When you use USB master CC8531 that you can configure two channels for Front left/right and two additional channels for Rear left/right. Please download Purepath wireless configurator and look at all available options. It is best answer to your questions :-)

    4. CC85XX includes only I2C Master interface and you can preconfigure scipts and commands for configuring I2C slaves. You can for example push button for volume-up a circuit sends I2C command to DAC with volume support to increase volume. If you have DAC which requires software configuration, that you can preconfigure automatically DAC after power-on or sample frequency change. CC85XX probably doesn't have I2C SLAVE mode and you can't configure them with other Master processor. I haven't experience in this area, maybe somebody tells you more.

    Best regards, Pavel

  • 0 in reply to Pavel Ruzicka
    TI__Mastermind 21125 points

    Thanks for this good summary Pavel. 

    Would just like to confirm that the CC85xx do not have any I2C slave mode.  
    If you would like to control certain aspects of the CC85XX during operation the EHIF interface has to be used. This is SPI and not I2C. For full reference of the EHIF interface please look at the user guide appendix B:
    http://www.ti.com/lit/swru250

    Regards,
    Kjetil