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STM32f030cct6 port pin failure

Question asked by patel.karan on Apr 18, 2017
Latest reply on Apr 19, 2017 by AvaTar

we developed thermal printer solution using STM32F030CCT6 controller.The issue after 3 or 4 days of working on end user's site some of the pins failed (i mean showing zero resistance to ground).scenario is as below.


there are two cards one card is with stm32f030cc controller which handles some task and another card have printer motor driver ic(tb6562ang) which drive ltpd247ab printer mechanism.max switching freq of this signal is 300hz

there is 30 cm long jatag connector between this two card(for input to driving ic).there are 5 pins for motor driver ic in this 20 pin jtag connector.after few days of operation on of the pin from these 5 pin fail.I internally pull up this five pin and there is no external resistance connected on this pin.This is very argent as device is start to fail in numbers so any one please help me.......