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Battery supply to TMS320C6713 DSK

Jason Wong1
Prodigy 130 points

Hi there,

I'm currently working on a project which requires me to build a single device incorporating a DSP. It would look something like a handheld Sound Level Meter.

I require a battery power supply inbuilt on to the same device within the device enclosure. I read on the manual that there are 2 possible power connections. Ie J5 and J6.

Considering J5 is a main power supply,  I guess it would not be appropriate to utilize this connection.

J6 however, requires a molex #15-24-4041, which would be connected to a laptop or PC. What kind of connection is this? ie how will it connect to the PC via which port?

ALSO, it seems  the molex #15-24-4041 part is OBSOLETE. Any replacements for this? 

AND, would it be possible or advisable if I use J6 to connect to a battery supply ie AA batteries? 

IF not, how would we supply power to the board with batteries? 

thanks! appreciate it

Jason

  • 0
    Expert 2210 points

    We just had this discussion in a nearby thread.

    J5 is not a "main power supply", it is a connector to which 5V at up to 3A is attached.  That (5V, 3A) is obtained from a separate "power brick" (supplied with the DSK) that itself is powered by the "mains" (AC).

    J6 can also be used to supply not only 5V but also +12V and -12V (which are passed to the 80-pin daughtercard connectors), once you have soldered in the missing connector.  (I gave an alternate part # in the other thread.)  It is a standard PC peripheral power connector, same as found on older (non-SAT) hard disk drives, CD-ROM drives, etc.

    If you don't need 12V for daughtercards, and if 4.8V will be okay for the "5V" supply to any daughtercards, then you should be able to operate the DSK6713 for up to 8 hours at a time using 4 NiMH rechargeable size "AA" batteries in series, supplying J5.

    See the other thread for further details.

  • 0 in reply to Douglas Gwyn
    Prodigy 130 points

    Hi, 

    Should I supply J5 with AA batteries, I would not be able to supply J5 with main supply. As I would have to remove the battery supply to J5 and then connect the mains to J5.

     Ideally, we would want the AA batteries to be charged and the board powered by the mains when J5 is connected to the mains and the board powered by the AA batteries when J5 is disconnected from the mains. ( Like a laptop). 

    Therefore, J5 should be free at all times when the device is portable. 

    This is to my understanding that there are only 2 power inputs to power the board. Ie J5 and J6. But J6 is connected to a PC, making the device not portable. 

    Is there a way to supply the board with power with charging and power advantages similar to a laptop? ie powered by batteries and powered by mains with the battery being charged when J5 is connected to mains.

    Need some advice is this matter.

    many thanks

  • 0 in reply to Jason Wong1
    Expert 2210 points

    The four AA batteries would *replace* the 5V obtained from the power brick that is attached to the mains AC on its other side.  You would charge them by removing them from the battery holder and putting them in an external charger, which is easily found at stores such as Radio Shack.  If you have 8 AA cells then you can use 4 of them with the DSK while the other 4 are charging in the external charger.

    It is not a good idea to try to charge the batteries while they are attached to the DSK.  Doing that safely would require additional circuitry.

    J6 does not need to be connected to a PC, just to a suitable power source.  I mentioned it only in case you need the +12V and/or -12V for some daughtercards; if you do, then J6 is a convenient place to attach the power.

    The DSK was not intended to be a portable device, so you should not expect portable use of it to be as convenient as for a consumer laptop computer system.

     

  • 0 in reply to Douglas Gwyn
    TI__Guru* 84110 points

    Jason,

    If you are interested in building a battery supply and including a charging system with it, this is a very well-supported capability with TI battery management components. As Douglas says, this will require additional components which increases the complexity of the design over just connecting 4 AA cells in series. But it greatly increases the flexibility and usability of your design.

    As a good starting point, you can go to TI.com and click on the Applications tab. Look for Consumer & Portable Electronics, then at the bottom under Other Consumer & Portable Electronics you will find Power: Battery Management. That page has a lot of helpful starter information, and there is a Battery Management Forum here at E2E (go to E2E Home and click on the + of Power Management and you will find Battery Management. Those people know a lot more than I do about the many devices and how easy they are to use.

    It all depends on how much you want these capabilities and how much you would like to learn about this part of the industry. It can be very profitable to explore new areas.

    Regards,
    RandyP