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TMS320F28035: whats problem? tms320f28035 gets very hot.?

mosi heydar
Prodigy 100 points

Part Number: TMS320F28035
Other Parts Discussed in Thread: LM1117

i use tms320f28035 ,some board Suddenly  start high current About 1 amp @ 3.3v
and microcontroller gets very hot and abnormal Behavior

then must be replace new microcontroller
about 20 uC on 10 board

I don't know how it goes?

regulator lm1117-3.3 volt with 1000uf cap and many 100nf ,10uf

someone have experience like it?

  • 0
    TI__Mastermind 42195 points

    Mosi,

    I think you have damaged a device. This commonly happens when a device operates outside of the values documented in its Datasheet. You will need to evaluate your circuits.

    Sometimes damage can be caused by ESD as well.

    LM1117 should be OK for a 3.3V regulator.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 100 points

    i use standard value like TMX320_P28027.pdf

    just XRS PIN pull-up to v3.3 and dont use "Microcontroller Supervisory Circuit" chip MCP130T

    Having no chip makes this difficult?

    Is this uC sensitive to low voltage?

  • 0 in reply to mosi heydar
    TI__Mastermind 42195 points

    mosi heydar said:
    i use standard value like TMX320_P28027.pdf

    '

    I cannot see what the above is.

    mosi heydar said:

    just XRS PIN pull-up to v3.3 and dont use "Microcontroller Supervisory Circuit" chip MCP130T

    Having no chip makes this difficult?

    It is OK to just use a pull-up resistor between 2.2K ohms and 10K ohms. For noise filtering a capacitor is recommended between XRSn and VSS. You do not need an external supervisor, but it is OK to use one.

    mosi heydar said:
    Is this uC sensitive to low voltage?

    This uC has a set of "Recommended Operating Conditions" found in table 5.4 of the Datasheet. This table details the minimum and maximum supply voltages. Operating outside of these conditions for long periods of time can shorten the life of the device. There is also a "Absolute Maximum Ratings" table in the same Datasheet, if you exceed these conditions the device may continue to operate, but will be damaged in some capacity.

    Regards,
    Cody