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Hi,
I am facing problem with TM4C1294NCPDTI3 MICROCONTROLLER showing the ground and supply getting shorted.
The schematics is exactly same as tiva series launchpad.
Below are the steps followed
1. Checked the bare PCB for any shorts.
2. Microcontroller and its related components are soldered.
3. No shorts are observed between uC pins.
4.Measured the resistance between +3.3v and Gnd it shows 330KOhms
5. Measured the resistance between VDDC and Gnd it shows 5.89KOhms
6. After Powering the Microcontroller the current drawn is 230mA and IC gets heated up. After Power OFF, The resistance between supply and GND is 1.5Ohms.
7. Replaced with two new IC and the problem exists.
the IC part no is TM4C1294NCPDTI369AVC5W G4
Kindly Help..
7.
A silly question but is the device soldered the correct way around?
We have destroyed a TM4C123GH6PM by soldering it the wrong way around, you get an almost direct short between 3V3 and GND of the micro.
This properly directed to poster - not to Amit.
While you report "measuring" 3V3 - have you properly scoped that voltage upon board, "Power Up?" Brief transient voltage is (likely) suspect and your avoidance of bulk filter caps makes your board especially vulnerable to such transients... (we've encountered this several times w/client designs..)
Note too that VDD "going negative" (even briefly) is a known cause of MCU murder...