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TMS320F28335 hardware design issue

user489789
Prodigy 220 points
Other Parts Discussed in Thread: TMS320F28335, CONTROLSUITE

Hello Team TI

Greetings

Am very badly in need of your support related to the TMS320F28335  design

In order to re-vet our design, we were trying to see more information on design guidelines and incidentally and got "Hardware design guidelines for TMS320F28XX and TMS320F28XXX DSCs" SPRAAS1C and also a reference design schematics (Aug' 2015 document)

While going through this we found that if the device is working at 150MHz, the coreVdd should be 1.9V instead of typical 1.8V and also a power sequencing of core and IO VDD is recommended

Since none of these information was available earlier, our ECU has 1.8V which is derived from 3.3V source

Also we have seen lot of abnormal from the device whenever the system outputs control lines driving some relays. The controller was found to be in one of serial ISR without any interrupts (actually this port is open)

Also a power supply device with part no. TPS767D301 is used which is giving out 3.3V, 1.9V (adjustable) and Reset output

We are redesigning the ECU and would like to know if any special care / design guidelines to be followed and any specific power supply circuit to be used.

 If so we request you to give us a quick mail discussing about all the above points

Thanks and regards

ratna

  • 0
    TI__Expert 7885 points
    Hello Ratna,

    First places to look are the signal descriptions and recommended operating conditions sections in the datasheet, then the silicon errata.

    I would also suggest looking at the F28335 controlCARD schematic in controlSUITE:

    ...\controlSUITE\development_kits\~controlCARDs\CC2833xHWdevPkg\F28335controlCARD HWDevPkg ZJZ [R2.2]\F28335 controlCARD ZJZ Schematic [R2.2].pdf

    The only difference I see in the controlCARD schematic is it uses 1.8V for VDD. Other than that difference, you should be able to use the schematic as a reference.

    Also If you would like us to review your schematic once you have created it, you can post here and request that.

    Best Regards,
    Adam Dunhoft