All Questions
Tagged with esd microcontroller
29
questions
12
votes
7
answers
5k
views
Tie all unused GPIO to GND?
Recently, during a discussion with a senior electronics engineer on an industrial project that operates at 48V and is housed within a metallic casing, a point of contention arose regarding ESD ...
- 847
0
votes
1
answer
159
views
MCU Input ESD Protection + debounce
I'm working on a device which requires reading from a reed switch (slow, water meter) which should work in a bit noisy environment (a few relays switching back/forth on the same board, triacs and ...
1
vote
1
answer
153
views
Can "fried" semiconductor devices recover themselves over time?
When this whole "smart soldering iron" craze was just getting started, I jumped on the bandwagon and got myself the very first revision TS100. What I also got then is the complete inability ...
- 151
4
votes
3
answers
1k
views
Absolute Maximum ratings of a device
In most of the devices I have seen so far, the absolute maximum ratings of the pins of the IC are given with respect to voltage.
For example, the maximum voltage applicable on a pin would be something ...
- 1
1
vote
2
answers
107
views
Selection of ESD diodes
My objective is to protect the pins of a device.
The pins are connected to an external connector which might be exposed to an ESD event.
Hence, I need to place an ESD protection device on that line.
...
- 1
0
votes
0
answers
153
views
Position of TVS diode in Ethernet application
I'm going through this appnote.
My question is based on Figure 1 on page 1 of the datasheet.
Am I correct in understanding that it is not correct to move the TVS diode (DBI) from the PHY side of the ...
user220456
1
vote
2
answers
101
views
Protecting multiple MCU digital inputs from high voltage / ESD
I need to design a circuitry with at least 16 inputs used to capture low speed digital input signals (such as buttons with dry-contact). I'm also planning to use a multiplexer/demultiplexer (such as ...
- 21
1
vote
0
answers
78
views
Limiting negative peak voltage on ICSP Data lines to less than -0.3V limit under 8kV negative ESD test
I am doing ESD simulation using LTSpice for 8kV Negative tests on PGEC & PGED Data lines of PICSP programming port. am using PIC24FJ256GB406 MCU. This specifies absolute max negative voltage to -...
- 29
0
votes
1
answer
401
views
Wierd noise on GND when I touch a metallic object to it
I am facing a problem.
I have a PCB designed which fails ESD tests.
The PCB is powered by an external power supply that provides 12V to the system (from 240V AC.) The power supply is CE certified and ...
- 31
3
votes
1
answer
497
views
How can I test if a GPIO pin on a microcontroller has been damaged by ESD?
I need to test if a microcontroller's pins are damaged after hitting it with an ESD gun. The microcontroller I'm testing is the STM32H743. The only method I have come up with so far is to just Toggle ...
- 51
5
votes
2
answers
845
views
IC protection diodes confusion
This question is (loosely) related to my previous question here.
I wanted to check the ESD protection diodes of the LPC1114 MCU from NXP. So I measured all pins on a brand new LPC1114 MCU with a ...
- 7,653
5
votes
3
answers
3k
views
ESD protection for ESP32 GPIOs
I want some of the ESP32's GPIOs to be accessible via 3.5mm headphone jacks or RJ11 jacks and therefore need suitable ESD protection. I wonder how much is needed for optimal protection.
Conditions/...
- 51
0
votes
0
answers
126
views
Suppressing noise and ESD from relay into microcontroller
I'd like to read from a relay on a CNC machine with a microcontroller running at 3.3V, the wire will be 1-1.5m twisted pair from the micro to the relay and screwed in to a terminal.
There's a lot of ...
- 61
0
votes
0
answers
129
views
Microcontroller Oscillator Layout for ESD immunity
I have a small portable USB device failing ESD immunity. It's a two layer board with a solid ground plane on the bottom. I have diode protected inputs, and there's a TVS on the USB connector, and I'm ...
- 145
0
votes
3
answers
2k
views
Should I connect the computer VBUS line to the 5V line of the board?
I am doing a project that needs USB communication with my microcontroller.
On the board there is already a 5V power supply. I would like to know if it is correct to ...
- 583