Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [hot-plug]

The act of connecting a communication interface between two devices while one or both are powered up. The design of interfaces to tolerate this.

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Why does hot plugging blow stuff up, and how to prevent it?

I made the very stupid mistake of hot plugging stuff many times before. My problem is that I rushed and it's just so easy for me to forget I have the Arduino on or some other expensive IC or hardware plugged in. Today I hotplugged the PWM input of…
Ageis
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Add a passive hardware token using a 3.5mm jack

I have a box that I made for my niece, which allows her to exchange voice messages with me. It is powered by a Raspberry Pi and features two buttons, a LED, a microphone and a speaker. Now, for Christmas I want my niece to be able to exchange these…
Besi
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Disabling DisplayPort hot plug detect

I have a PC with a DisplayPort monitor. When the monitor sleeps or is powered off, the OS loses track of the current display resolution. My research indicates this is probably due to the Hot Plug Detect (HPD) pin being brought low when the monitor…
Ouroborus
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Noise resilient, hot-pluggable communication bus over long cables?

I'm working on a setup, where we need communication between a master device and several slave microcontrollers distributed out in different boxes connected by "long" cat5e cables (3-10 meters) The microcontroller boxes (MC-boxes) should be…
Johan E. T.
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How to trigger hot plug detection in HDMI interface?

I'd like to trigger the hot plug detection circuit for one of my graphics card's outputs so that Windows would "think" that it has secondary monitor attached. I know that there is a pin in the HDMI socket that must be set to high to detect a…
mracer164
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USB hotplugging causes latchup in LDO

I am working on a device that is powered from a USB host and has a downstream-facing USB type A receptacle. VBUS on the downstream port is connected directly to VBUS on the upstream port, and 3.3V power for the device comes from an LDO with its…
jrw01
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What is the correct behavior of the HDMI HPD signal?

Can anybody explain the correct behavior the HDMI HPD (Hot Plug Detect) signal? For example, I've disassembled an HDMI coupler and connected a few wires to the +5V/HPD/GND (shell) and here is what I'm seeing: HDMI plugged into source: +5V (pin 18)…
SofaKng
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Why is my Pi Pico resetting from HDMI hotplug (transients question)

Why exactly is my Raspberry Pi Pico (MCU) resetting during HDMI hotplugs with my simple HDMI signal sniffing circuit? Although the solution to this is obvious, I'm curious as to exactly what's happening and if this is cause for extra considerations…
BobIsNotMyName
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What is the best way of implementing ethernet over a custom pogo pin connector?

I'm designing a custom hot swap connector with pogo pin contacts, similar to that of an electronic camera lens. I am wondering if there are any special considerations I should be taking if I want to implement ethernet across these pins: I plan to…
rayan4444
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Serial circuit protection design

I've been researching RS485 hotplug protection for a while and come up with the following solution. The reason is that I burned two custom Arduinos, after further investigation it turned out the GND pins of the Molex connector of the hub were not…
Maciej Swic
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Hot-pluggable bus design review

I am currently designing a hot-pluggable bus system where a module is connected to its respective slot via a first mate/last break spring-loaded connector. I am using PJON, in specific PJDL on the link layer, for the actual communication which is…
sephalon
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Leaving DVI hot plug detect pin unconnected

I am making a custom cable from a VPX backplane to a DVI-I connector, and need to know if the DVI cable will work OK with a standard monitor if I do not wire up the hot plug detect pin. I will never be connecting a monitor to this cable when either…
Liz Morrissey
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What makes signal lines hot swappable?

In MAX14780E datasheet, it's explicitly featured as "hot swappable", however in AM26C31 datasheet this isn't mentioned. Moreover, I suspect that I burnt one of the AM26C31 ICs while hot swapping. I'm aware that hot swapping is also related with the…
ceremcem
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Wall supply Plug-in "noise"

We have had some issues with resonance overshoot from our 10W wall supply to a products LDO. The theory is that this overshoot will destroy the LDO once in a while rendering the product useless. While investigating this I examined the difference…
EmilBonnevie
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circuit for hot-pluggable device

I have a scenario, where device A provides 24V, device B converts 24V to 3.3V and feeds it back to device A. Both devices communicate with TTL (@3.3V), so we have 2 signal lines as well. What circuit is required so that I can safely plug device B in…
Sim Son
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