All Questions
Tagged with esd circuit-design
13
questions
3
votes
1
answer
360
views
Can someone explain USB ESD-protection on Nucleo 144?
On the STM32 Nucleo-144 eval board, there are 3 different ESD protection devices for the USB port:
U19 = USBLC6-2SC6
U21 = ESDA7P60-1U1M
U22 = ESDALC6V1-1U2
Source:
https://www.st.com/en/evaluation-...
- 183
0
votes
0
answers
39
views
USB ESD Protection with the NUF2042XV6T1G IC
I have been trying to figure out how exactly I should connect the NUF2042XV6T1G IC to my USB data lines. From what I understand, usually a reverse biased transile diode is connected between the data ...
- 23
5
votes
2
answers
1k
views
ESD protection on an isolated circuit
I'm currently working on an RS485 DMX circuit and am thinking about proper protective measures.
I've oriented myself on this question. I understand that galvanic isolation does not equal ESD ...
- 173
1
vote
1
answer
1k
views
Do the MCP23S17 GPIO pins need protection against latch up ESD within this circuit?
I wrote about this system before. I will focus my questions now on "ESD protection" direction.
I have an SPI based system in which a Raspberry talks with a GPIO expender device using SPI ...
- 851
1
vote
2
answers
260
views
how to make an ESD sensitive circuit?
I have an experiment where I plug a sensor to an ESD (Electrostatic Discharge) protection circuit. Sensors are very expensive and very sensitive to ESD.
I have tested my protection circuit it is ...
- 31
3
votes
2
answers
1k
views
Test pad's ESD protection
I design a module with onboard test-pads. I put ESD protections to all out-world connections like sockets etc.
But I want to ask that; should I put ESD protections to test-pads and ISP socket inputs?...
5
votes
2
answers
1k
views
Use of internal PCB ground plane as ESD baseplate/EMC reference plane of product in plastic enclosure
I am designing an electronic product which will be housed in a plastic (non-conductive) enclosure. There are a number of, mostly shielded, I/O cables (Copper 10/100/1000Mb/s Ethernet, USB 2.0, RS232, ...
- 51
0
votes
1
answer
731
views
Connection of LAN8742A nRST pin causes failure when ESD strike
My circuit uses LAN8742A ethernet phy. The system has a metal case and gets 220V AC to power supply board. After converting 5V DC it goes to my board that has Ethernet and mcu. I screwed case and ...
0
votes
1
answer
128
views
What are these fuse-looking cartridge case components on small, battery operated RF tranceivers?
I have recently opened up 3 dead, battery-operated RF transceivers lying around, both wearable and key-chains. I've noticed that all three had components that looked like fuses (cartridge case), ...
- 3
0
votes
2
answers
536
views
How to calculate resistor values for a Foot Strap test circuit using a window comparator?
I'm attempting to create a circuit to test ESD foot straps (and wrist straps). Research has led me to a window comparator circuit for testing power supplies that I've used as a base for the drawing ...
- 1
3
votes
2
answers
1k
views
ESD Mat circuit theory
I've tried researching this extensively, checking existing threads, but I suppose with any uncertainties in this subject, they are hard to convey properly and therefore hard to find answers to.
So I ...
- 139
2
votes
2
answers
510
views
Failing LiPo charger circuit
Working with microchip MCP73831T chip to charge a single LiPo cell. We are producing by the 1000 unit and getting significant failure of the charger IC. I suspect we need ESD protection on the 5V ...
0
votes
1
answer
124
views
How to determine the ESD level?
I would like to know how we determine the IEC 6100-4-2 level for a product.
There are 4 levels, and I don't know what level take.
It's for an encapsulated system with mechanical ground separate from ...
- 120