Low Power RF PurePath Wireless Audio Forum - Recent Threads

About ON of a CS_N signal, and the timing of OFF

hirokuni oota — Fri, 17 May 2013 05:11:11 GMT

Hi,

I may not understand about the timing which turns on CC8520 and it turns off by a CS_N signal.

Since I wrote the contents to the attached file, I hope to have you see and to receive a reply.

Best regards.

Hirokuni Oota

(Please visit the site to view this file)

Microphone on CC8520

EDR — Tue, 24 Jul 2012 07:53:33 GMT

Hi,

When I use the CC8520 with any music device connected to the master, the output is heard clearly through the slave. However, when I connect a microphone to the input I am unable to hear anything. If I increase the fixed offset it only increases the noise, and no audio from the microphone can be heard. Any advice?

AIC3204 Microphone vs Line In

Craig Carder1 — Thu, 23 Aug 2012 12:42:02 GMT

I've seen this post on here before but couldn't find the solution so I apologize if this is a repeat.

I'm currently using the CC85XXDK-HEADSET and everything works fine with a Line In from a PC. But when using a microphone directly I hear very little or nothing at all.

Does anyone have any recommendations for an adjustment to the AIC3204 to I can receive a microphone signal?

Thanks

Craig

PurePath Input PGA Gain Control problem

Mikelis Studers — Thu, 16 May 2013 21:55:50 GMT

I am trying to set up a wireless microphone application on PurePath Development Kit (Wireless Audio EB) with TLV320AIC3101. Microphone node is Master, Mono Input base station, streaming SLAC. I'm routing microphone (electret with MICBAS) signal to Left ADC and applying a gain to the signal through 'Page0/Register 15: Left-ADC PGA Gain Control Register'. It seems like the register doesn't respond to changing its value. The gain can't be changed and also signal can't be muted through this register (by toggling bit D7). There is some signal picked up from mic, but the gain is very low and can't be changed.

Audio device Customization sequences (only changes applied to default) :

OFF to SR-SWITCH:

#original# w 30 13 80 # Fully-differential line in L 1, gain 0 db, left ADC unpowered

#original# w 30 16 80 # Fully-differential line in R 1, gain 0 db, right ADC unpowered

w 30 11 0F # MIC2L connected to Left-ADC-PGA mix, MIC2R not connected to Left-ADC-PGA mix

INACTIVE to LOW-POWER:

#original#w 30 13 84 # Fully-differential line in L 1, gain 0 db, left ADC powered

#original#w 30 16 84 # Fully-differential line in R 1, gain 0 db, right ADC powered

w 30 13 7F # Left-ADC power-up

w 30 0F 78 # Left PGA unmuting and gain DOESN'T WORK

w 30 19 C0 # MICBIAS to AVDD

Automatic Gain Control works, so I assume it is able to change PGA value, it just doesn't work when changing through Register 15.

Any ideas?

Mikelis

Couple of basic questions about using host-controlled CC85xx

Oleg Komlev — Mon, 20 May 2013 15:08:59 GMT

Hi,

Sorry for basic questions, I'm new to in-depth aspects of PurePath:

1) We are planning to use CC8520 controlled by CC430 MCU via EHIF. We want to use pre-defined configuration provided by PP Configurator, and possibly resort to EHIF later. The question is - does CC8520 allow full spectrum of Host commands with, say, preloaded demo flashed in?

I've noted that after performing Chip Reset, PP Commander allows to read device info (which means EHIF commands are issued, and they do show in a log). Generally, we want to flash CC8520 with PP Configurator and maybe use EHIF later without re-flashing CC8520.

2) How does CC8520 serve button/EHIF-driven requests to alter volume? Does it use codec's facilities by controlling the codec via I2C, or it alters the data in I2S stream?

E.g. there is CC8520 acting as an audio sink, with two buttons used as Vol+/Vol- control, like on CC85xxDK. An AIC3204 codec is connected to it via I2S and I2C, and the codec output goes to headphones. However, we also want to capture I2S data stream with other device connected to same I2S clock pins and data output pins of CC8520. If Vol+/- buttons are used, does that mean that CC8520 will access AIC via I2C to change volume, or it will alter data going out via I2S?

Thanks,

Oleg

Data Side Channel

Chris McDaniel1 — Thu, 23 May 2013 16:41:52 GMT

Are there any examples out there for using the Data Side Channel to send a simple byte of data? I cannot seem to find any.

Also, how is the data side communication channel enabled in the master? Using the commander, I see that WPM_DSC_EN = 0. Which means the master does not support DSC.

Any help in this is appreciated.

Thanks

Configurator Sample Rate

Geoff Pickford — Wed, 22 May 2013 06:52:50 GMT

Hi,

The 'Audio Streaming' section of the Ver 1.4 Configurator allows sample rates from 32,000 to 48,000 Hz, and audio latency samples from 640 to 2,084 (ie 20 to 64 ms).

My application is to be employed in harsh and noisy environments, where audio input from a noise cancelling (close-talking) microphone is to be heavily filtered to prevent low and high audio frequency audio noise causing a problem. Basically, I do not want any frequencies higher than around 8 Khz to be transmitted and/or received at any Master or Slave. Also do not care how high latency is.

Therefore, only need a maximum sampling frequency of 16 kHz, which should be more than satisfactory for my purposes.

How can I decrease the sampling rate to 16 kHz in the Configurator, and am I correct in assuming that the RF robustness and therefore range may increase. What would you suggest for latency settings?

Any known traps in taking this approach?

Any other ideas for increasing range with such a moderate audio performance that my project requires?

Thanks,

Geoff Pickford

CC8520 + CC2590 FCC compliance

Justin Magana — Fri, 17 May 2013 19:58:15 GMT

I'm working on a wireless system using the PurePath parts CC8420 and CC2590 and have had the luxury of being able to use the sample layout and antennas.

I know that these parts are suited for compliance for FCC CFR47 Part 15. How much do I have to worry about FCC compliance?

Is it possible to declare conformity, or do I need verification?

Any direction or reference on this subject would help.

Thanks

Justin

CC8531 SPI Voltage Levels

Chris McDaniel1 — Tue, 21 May 2013 15:21:48 GMT

What do the voltage levels need to be to transition High and Low logic levels on the MOSI/MISO pins?

Thanks!

CC85XX-CC2590 Headset external antenna

Mikelis Studers — Mon, 20 May 2013 18:09:26 GMT

I would like to use PurePath Headset development unit with another antenna than the inverted-F PCB antenna. My application is space constrained so I can't really use the larger PurePath Wireless Audio EB for this purpose.

What is the best way to add an external connector?

In the page 11 of the User guide for Headset board there is a picture of added coaxial cable with SMA connector. Can that be used as a reference? Which components need to be removed to add this cable?

The trouble which stops at a BIOS screen occasionally when CC85XXDK-HEADSET starts

hirokuni oota — Thu, 09 May 2013 07:44:09 GMT

Now, I am using CC85XXDK-HEADSET.

When it was made to start connecting this to the USB port of WindowsPC, it might stop at the screen of BIOS occasionally.

I connected the USB bus monitor and looked at the data at that time.

(Please refer to an attached file.)

When BIOS of PC starts, the PC side outputs a get_discriptor command and carries out the 240Bytes demand of the data of CONFIG type,index x0.

CC85XXDK-HEADSET returns the data of 240Byte after it.

When it stopped at the screen of BIOS, CC85XXDK-HEADSET had not sent 240 bytes of all data.

I found that data was missing on the way.

I think that it is the cause.

Is this a hard problem? Is it a problem of firmware?

Or are they other problems?

The version of firmware is 1.4.1.

If there is such a report in your company until now, please let me know.

Moreover, if there is a method of correcting this phenomenon, please let me know.

Best regards.

hirokuni oota

This is OK.

This is NG.

I2S mems mic to purepath CC85XXDK-headset

Boon nam Poh — Wed, 08 May 2013 09:51:31 GMT

Hi gurus out there...

i just gotten the CC85XXDK-Headset.

was planning to do a digital mems mic (i2s) wireless audio transmitter, checking all possible means to hook up this I2S mic to the purepath headset.

can anyone advise me if i am going to bang wall or it will be feasible one.?

i will need to bypass the onboard i2c audio codec, pass the i2s lines to the CC85XX controller.

How can i go about doing it?

help needed.

thanks in advance...

About the signal which shows the state of CC8520

hirokuni oota — Thu, 16 May 2013 08:44:06 GMT

Please let me know about DCPLpin (39pin) of CC8520.

I want the signal with which CC8520 expresses ON or OFF.

I think whether the output of the DCPL signal of CC8250 can be used.

Is it OK even if it uses the output of this signal for the input of one gate?

Is there any signal which can otherwise distinguish whether CC8520 is ON and whether it is OFF?

Best regards.

Hirokuni Oota

CC Debugger and host mode

Nir Dvash — Tue, 07 May 2013 08:52:26 GMT

Dear Sirs,

How can i program a CC85XX device on a target board which is controlled by a host? I think that If i will power up my target, the host pins

will block the SPI signals. On the other hand, if i connect pin 9 on the CC debugger connector (3.3V) from the debugger to my target, i may consume too much current from

it and damage the debugger.

What should i do?

Thank you,

Nir.

real word range testing for our CC8520-CC2590 design

Belkis Morgalo1 — Mon, 13 May 2013 08:08:00 GMT

Hi,

We have developed a PCB with the texas´s chips CC8520, CC2590 and AC3104 following as closely as possible the reference design CC85XX-CC2590EM. Although the audio quality is optimal we are not satisfied with the radio range and we want to evaluate it in some way.
For this we are interested in implementing the test described in application note AN089. We have the PurePath and SmartRF04EB evaluation boards. We wanted to know if there is a way of programming the C8051F of SmartRF04 as external host only using the SmartRF Studio in order to receive trough it the response to the commands PS_RF_STATS and PS_AUDIO_STATS.

Hope for reply, thanks

Best regars,

Belkis

Choosing an audio source on the CC85XX-DK

Lee Shaw — Wed, 08 May 2013 16:49:49 GMT

Hi,

Hopefully this is a straightforward question but I can't seem to find the answer...

I'm using the CC85XX-DK kit and was hoping to find a way to map one of the switches on the master audio EB to be able to select which input channels to use on the AIC3101 codec.

This is because I want to have two different audio sources both connected to my master audio EB at the same time. Then use one of the Audio EB onboard switches to alternate or scroll through which audio source is transmitted to the slave audio EB(s).

Is this possible? Or do you just have to rely on only sending audio data through its respective channel when required?

PS. I want to do this in autonomous mode, not host controlled.

Many Thanks.

CC8520 Clarification

ionut remus — Sat, 04 May 2013 07:44:54 GMT

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?

Danionics DLP 413239

Nir Dvash — Thu, 02 May 2013 12:53:16 GMT

Dear Sirs,

Can you please let me know where can i source the above mentioned battery, used in the CC85XX_Headset eval board?

Thank you,

Nir.

CC8521 usb soundcard

Jack Jiang1 — Sun, 12 May 2013 13:28:08 GMT

Hi,

I used CC8521 to make a USB dongle,the hardware works good, but when I used the VOLUME bar(windows xp sp3) to turn down the volume, it didnt work. At last,I found that only the WAVE bar can be used to turn down the volume,as show below:

The SPEAKER bar was gray, it didn't work when value be changed,even though click the first CHECKBOX (Mute) , there was still output. Did I miss any details when I configurate the CC8521? Or anything wrong with my PC operate system? When I plug the dongle,the output always at the MAX volume,are there any configurations to make the OUTPUT at the MIN when plug the dongle ?

Hope for reply, thanks.

Regards.

Jack.

Quality between PCM16 and PCME24

Jack Jiang1 — Wed, 08 May 2013 08:33:44 GMT

Hi,

I want to get a high performace audio ,if I use 24-bit ADC@PCME24 format , will all the 24-bit data be transmited to the SLAVE? Can you give me an example or article about the process of the 24bit PCM data be changed to PCME24 format .

Best regards.

Jack.

Toggling one slave between two masters - CC85XXDK Headset

Adam Nightingale — Wed, 08 May 2013 11:47:19 GMT

I'm using button triggered proximity based pairing with one slave (i.e. audio output) and two masters (i.e sources). I want to toggle between the two sources (and potentially cycling through more) when the button on the slave is pressed when it is in range of both masters. Is there a way of configuring the slave to do this? At the moment the slave pairs to whichever source it is closest to.

CC8521/CC8531 USB dongle as MASTER ? CC8520 as SLAVE?

Jack Jiang1 — Sat, 04 May 2013 06:53:23 GMT

Hi,

Can I use the cc8521 /cc8531 to design the USB dongle as MASTER? Now I have got a CC8520 output SLAVE .

regards

Jack.

Orcad files for the CC85XXDK_Headset

Nir Dvash — Thu, 02 May 2013 08:59:20 GMT

Hi,

Can you please direct me to Orcad files for the CC85XXDK_Headset eval board please?

Thank you!

Nir.

CC8530 fail in 2nd harmonic

Edwin Ng — Fri, 03 May 2013 11:08:20 GMT

Dear Sir,

Attached please find the 2nd harmonic we found in CC8530 pre-scan. Previously, we make pre-scan does not find the problem that we have 4-5 dB margin. it is under Rx mode
Now, we found that 2nd harmonic is failed 2 dB in headset and pass about 7 dB in base. The failure is due to the emission at frequency offset to the 2nd harmonic as in attachment.

Any advise? what kind of schematic design and PCB layout we need to consider

B.R.

Edwin

CC8520 RF Issues

Marcie Dobyns — Mon, 22 Apr 2013 22:24:41 GMT

Hello!

We have a design that uses the CC8520. This design started from the CC5831 Development kit and has been laid out with the CC8520.

We are seeing two issues:

1.) When the transmitter and receiver are hardwired together with a step attenuator between them, we have at most 55dB of range before the link disappears entirely. According to the datasheet this should be more like 85dB, which is what we see when we use the development kit.

2.) There appears to be an issue with the acceptable accuracy of the 48MHz crystals. According to the datasheet we should be able to have +/- 50ppm accuracy, which is approximately 2.5kHz. The transmitter is running at 48.0022MHz and we have a signal generator hooked up providing the oscillation for the receiver. If the sig gen is set up to provide the 48.0022MHz we are fine, however, if we adjust off of this even a little, we run into significant dropouts (1+ dropouts/second). If I set the sig gen low to 48.0007MHz, we experience the significant dropouts even though this is well withing our 50ppm accuracy. If I set the sig gen high to 48.0030MHz we also see significant dropouts.

My question is, what could be causing these issues?

Thanks!

Marcie