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IS1621N on BCK-08 PCB

19th January 2010, 11:45 pm


In other cheap Chinese device news here’s DealExtreme p/n 8422 with the case removed, powered by a benchtop supply, peered to my Nexus One, and playing audio. I’m hoping to redo the output circuitry on this and put it in another case to make a decent Bluetooth audio device for connecting to either a home or car stereo. It runs off of 3.7 VDC and has an on-PCB antenna, so it should be pretty easy to work with.

The PCB contains an I.S.S.C. IS1621N and FM24C08B EEPROM, which likely contains the IS1621N’s config. I’ve requested the data sheet for the chip from I.S.S.C., so hopefully I’ll have that soon and can work on it. I’d also like to change the identifier string in the EEPROM, but I probably won’t touch that until I know what the IS1621N expects to find in other parts of it. I also hope to find an example implementation, as it should be easy to build off of that to get line level output.

Here’s a few more pictures of the board:

· Detail of the FM24C08B EEPROM which likely houses the config for the IS1621N on the BCK-08.
· Top / button side of the BCK-08 PCB.
· Bottom / component side of the BCK-08 PCB showing the I.S.S.C. IS1621N Bluetooth IC and FM24C08B EEPROM.

Category: acquired things, electronics, making things  |  Comment (RSS)  |  Trackback

12 Comments

  1. John:

    Wow, I am looking to do the exact same thing. I just opened my BCK-08 from Dealextreme and searched IS1621N and found your post. Could you keep me informed of your progress. Nice pics. I noticed that the audi quality wasn’t up to par. I would like to add this to the x-mini max ii speakers (which I haven’t aquired yet).

    20 January 2010, 11:25 am

  2. c0nsumer:

    John: Ha, wow. Funny, that. I haven’t done much with it, but thus far I’ve found that it seems to be a lot more stable with peering when powered from something other than its own battery. I’ve also had a bit of weirdness with the charger on one of my two, as it just seems to stop charging after a while. One thing I’m also thinking of doing is making a small box with a mains cable coming out of one side, and a 3.5mm or dual RCA on the other. This could easily be tucked somewhere out of the way to provide BT audio to receivers, and if the buttons (at least the center one, and maybe the LEDs) are brought out to the panel, it’d remain quite usable.

    23 January 2010, 6:57 pm

  3. John:

    Yeah, I didn’t seem to get a good charge in one of my sets off PC usb (only one tested so far). The sound quality driving my home stereo rca inputs seems to vary with the state of the charge (have to crank everything way up). With my Sony headset it sounds pretty good. I am planning to run the bck-08 off the Li-ion battery (400mah) in the X-mini speakers. Will post a comment when I get a chance to try that.
    What I really would like to do is put 1 of these in each of the X-mini speakers and drive them both from my cell (completely wireless). But I am not sure how to sync my cell with more than 1 bluetooth device. Is that why you are thinking of changing the identifier string in the EEPROM? Will that work?

    25 January 2010, 10:32 am

  4. c0nsumer:

    John: I’m actually thinking of changing the string in the EEPROM simply because I can. No real other reason… I’m not sure if you can do what you are thinking of, and getting the to play in sync out of each (due to likely buffering) might be a problem.

    25 January 2010, 10:48 am

  5. Constantin:

    Hey,

    could you send me a picture of the battery. I unsoldered mine in order to replace it with another one and forgot to how it was hooked up.

    my email is klucon2@web.de

    thx, for the help.

    11 February 2010, 7:21 am

  6. c0nsumer:

    Constantin: The positive wire goes to +, the negative goes to -. I believe positive is red and negative is black, but I no longer have the battery (it appeared to be crap), so I can’t take a photo of it. Simple checking with a meter will tell you what goes where.

    11 February 2010, 1:06 pm

  7. Duncan:

    Crazy. I bought the BCK-08 with exactly the same plan in mind. Ripped it open, searched for chip info and found this blog.

    Have you had any luck getting your hands on the datasheet?

    19 February 2010, 3:26 pm

  8. c0nsumer:

    Duncan: Sorry, no. No luck… I’ve sort of given up on it, too. I’ve simply received no response from I.S.S.C.

    22 February 2010, 3:56 pm

  9. Massimo:

    …could you tell me what kind of battery type is mounted on adn/or what is load current?

    Many Thanx

    16 March 2010, 7:31 am

  10. Nemno:

    http://www.docin.com/p-43749956.html

    4 April 2010, 3:02 pm

  11. Nemno:

    seems to be the datasheet. Sorry for the splitted post.

    4 April 2010, 3:03 pm

  12. John Mak:

    would you make the datasheet in pdf format?

    25 July 2010, 12:36 pm

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