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Connecting EK-TM4C1294XL to BOOSTXL-SENSHUB - 5V Pin

Bruno Saraiva
Guru 13040 points

Hi there,

I just got by sensor Boosterpack. Before I plug it the other way around and burn something, I wanted to check the pinout diagrams... I plan to use the TM4C129 launchpad.

Well, I measured 5V on pin 2 of either X6 or X8 connectors on the launchpad.

The schematics for the sensor boosterpack seem to expect 3V3 on PIN1 (measured ok), but GND on pin 2, not 5V!

Am I missing something here!?!? Or can I just go ahead and plug that way?

Cheers

Bruno

  • 0
    TI__Guru**** 244450 points

    Hi Bruno,

    The SensorHub seamlessly fits on the TM4C129 Connected LaunchPad. To be double-sure, you can mount the Sensor Hub on an unpowered LaunchPad and do a continuity/short check from 5V to GND on the top side of the sensor hub. Similarly between 3.3V & GND and then 5V & 3.3V...

    Does this sound a reasonable method to make sure nothing "burns".

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Guru 47900 points

    To really insure that, "nothing burns" you must check that no other (unexpected nor unwanted) voltage source feeds into your MCU board!  (certain sensors - or displays - may "boost voltage" and while a, "pro" board should confine/quarantine this voltage - that may not prove universally true.)

    And - simple check for 5V or 3V3 short to ground will not detect the presence of such potentially damaging, foreign voltage.  (note: unlikely does not guarantee non-occurrence!)   (not to ask - how I know!)  Sometimes the best method to "pre-test/verify" an accessory board is to power it while it is "isolated" from all others.  And then systematically probe each/every interconnect pin - looking for unwanted/unexpected voltage levels.  So often you'll find none - but should one/several appear - and were unexpected/improper - you may have prevented a damaging situation.

    I don't know the implementation of your board - but past/similar boards (this vendor) employed the remarkable, deliberate, "pin to pin" shorting of 4 MCU pins.  Should these be set to output - with output levels in conflict - "burn avoidance" may be reduced!