Effects of applying higher voltage to pic16F88

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Discussion Overview

The discussion revolves around the effects of applying a higher voltage than specified to a PIC16F88 microcontroller. Participants explore the implications of this voltage application on the functionality and potential damage to the microcontroller, as well as troubleshooting steps and programming behavior.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant reports applying 7 volts to the PIC16F88 and questions whether this has damaged the microcontroller, noting it still can be programmed and read from.
  • Another participant suggests that the microcontroller may not operate at 7 volts but could be fine if the proper voltage (5 volts) is applied.
  • A third participant confirms that the microcontroller worked at 4 volts but encounters issues toggling a specific pin (RB0) with a delay, indicating potential operational limitations.
  • One participant mentions that integrated circuits can sometimes function partially after overvoltage, depending on what components within the IC were affected, and recommends testing with a new microcontroller to compare results.

Areas of Agreement / Disagreement

Participants express differing views on the potential damage to the microcontroller, with some suggesting it may still function while others highlight the uncertainty of its condition after exposure to higher voltage. The discussion remains unresolved regarding the extent of damage and operational reliability.

Contextual Notes

There are limitations regarding the assumptions about the microcontroller's behavior under overvoltage conditions, and the discussion does not clarify the specific failure modes or the exact operational thresholds for the device.

Who May Find This Useful

Individuals working with microcontrollers, particularly those using PIC16F88, as well as those interested in the effects of voltage on electronic components may find this discussion relevant.

okwatia
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i was testing my pic microcontroller (16F88) but i forgot about the maximum voltage and applied 7volts to it. The microcontroller did not give me the expected result.To me it looks like it does not work but when i connect it to the programmer i am able to reprogram and even read from its flash memory. I want to know whether i have spoilt the microcontroller as a result of the 7volts.
 
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I think its fine. It simply won't operate on 7v. Hence why it seems not to work. Input the proper voltage. 5V I would suggest, and I think you will find that it is not damaged.
 
Thanks HickmanENG. I used 4Volts and it worked (when i set the states of the pins) . But i want to toggle the state of pin 0 of port B (RB0) and whenever i do that with about 2seconds delay the pin only remains in one state.
Please note that:
I am using the internal oscillator of the micocontroller.
 
I have seen ICs that work to some extent, but fail to do other things.

They are just a collection of components and it depends on what failed when you put too much voltage on it.

I hope your IC is OK, but I suggest you get another one and try it with the same program in it and see what happens.
 

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