All Questions
519 questions
0
votes
5
answers
139
views
How to protect a μc IO pin that might see voltage when μc is off but must read it when μc is on?
I have a small voltage source which I'm using as a detector for power in another circuit. It connects to a microcontroller pin. Sometimes it's active when the microcontroller is not powered up, but ...
- 201
0
votes
0
answers
21
views
What's UHS-II microSD card Pin Definition？
Pins 9-17 I don't know what description they are，and I need datasheet or diagram to know which pin Definition
- 1
0
votes
0
answers
29
views
esp32s3 lora + bme280 sensor
Im using t3s3 esp32s3 lora module and i have question can i solder dirrectly bme280 sensor and then redefine code or should i wire them separately on. And how should i know which pins are scl and sda ...
2
votes
1
answer
71
views
Bidirectional Pin Handling In Verilog
I'm very new to Verilog coding, and I'm currently facing a problem with bidirectional pin handling.
I'll put the code below. In that, if mode is INPUT, I want to ...
1
vote
0
answers
60
views
Is it possible to merge to Nexus T120 connections together? [closed]
A friend of mine recently was issued the 3M PELTOR™ ComTac™ V Headset for work.
They have a slick setup where you can connect each ear independently to a separate audio source so you can listen in to ...
- 149
-1
votes
2
answers
80
views
How to extract GPIO pin TTL ratings for this MCU?
I'm using a MCU board with this MCU and following pinout:
Now the datasheet is huge and I couldn't figure out how to extract an information I need. In my case, I use PA2 and PB4 pins as UART TX RX. ...
- 2,255
10
votes
5
answers
2k
views
Where is the first pin when a chip has a bar and not a dot
this chip has a bar as an indicator,
could you please tell how to locate 1st pin
- 225
1
vote
1
answer
109
views
How to tell which pin is which on this toggle switch?
I'm working with 5646AB for my project. Can someone help me clarify which pin is which? I don't want to assume the top left one is 3 XD.
- 121
0
votes
0
answers
27
views
What is the best way of 8-Channel 2.54mm relay's pin terminal connection?
Well while I am developing small project I'm wondering how to make pin connections for ready-made modules. Such as this 8 channel relay
it has 2.54mm male header on it. if use jumper cable it dont ...
- 1,193
-1
votes
2
answers
70
views
What are the VDDSD, VLXSD, and VFBSD pins?
On the STM32WB09KEV, and on MCUs in general, what do the VDDSD, VLXSD, and VFBSD pins mean.
I can see that they have something to do with SMPS (input/output, ground and output), but what do they ...
2
votes
4
answers
674
views
Is a shunt jumper for a power plane jumper a good idea?
I am designing an experimental PCB. I have included a split rail DC/DC converter LM27762 on it. Since I wasn't sure it will work, for testing purposes I have included a 2x3 pin header for bridging the ...
- 23
3
votes
1
answer
107
views
Help identifying hollow spring / inverted header sockets
I'm trying to identify the following hollow sockets which are used to interface with a 0.1" pitched header:
(source: US Digital PC5 Broadcom/Avago Compatible Incremental Encoder Cable Driver. ...
- 33
0
votes
2
answers
64
views
Looking for a short sharp pin [closed]
I'm looking for a short pin with a sharp point, to be used for probing a circuit. Similar to a scope probe tip, but for a dedicated custom PCB.
Ideal length of <5mm, diameter of <1mm, solderable....
- 11
0
votes
0
answers
84
views
Identification of a directly soldered PCB terminal pin 13.55 mm × 1.58 mm
I add in this question the picture of a PCB terminal, in this picture have the mesures of it. somebody can tell to me what terminal is it?
Thanks.
0
votes
1
answer
38
views
The pin configuration of an RJ45 network connector Pulse J0G-0001NL
I have a few questions about whether I have pulled the right one for this RJ45 connector.
It's a Pulse J0G-0001NL and the pin configuration is below.
But note that if you look at the pattern, you ...
- 1,388
2
votes
2
answers
151
views
what is this part/component in this circuit schematic?
I have a circuit schematic (this is just a part of it):
I am trying to find what those little circles above and below the speaker are. I dont think they are part of the speaker itself, as there is ...
0
votes
1
answer
40
views
identifying component 12QF 65I COVQ
Can you please help identifying this component with top marking:
12QF
65I
COVQ
Device: an earlier 2020 revision of Xmos isolated I2S USB interface
- 13
1
vote
2
answers
80
views
What is the purpose of the "REF" pin of LTC6915?
I am working with a LTC6915 and i don't understand what REF pin does.
That like V+ - V- + Vref = Vout?
Or something else? I don't understand the datasheet.
- 29
0
votes
1
answer
98
views
Convert RS232 signal to USB
I have an optical amplifier that uses RS232 and I want to convert to USB. I've purchased this chip, also here. There is little documentation on this chip and the supplier hasn't responded to questions....
- 103
0
votes
1
answer
102
views
Why is KiCad repeatedly re-assigning the Ground Pin of a row of resistors to some random pad?
I have run into an odd problem with KiCad, whereby a row of resistors has its ground pads re-assigned to some random pad. This happened with the central row of resistors first of all, which were ...
- 165
0
votes
1
answer
62
views
PIC32 VUSB3V3 must be externally powered?
I use a PIC32 and I want to use RB11. That's a USB pin but can be used as GPIO.
The datasheet specifies in 18.4 page 180:
For non-USB operation with RB11 and/or RB10 as GPIOs, the USB module must be ...
- 29
0
votes
2
answers
84
views
old YAZAKI PCB pins
I have a circuit board out of an old dozer that are not manufactured any more. I managed to have a new one printed up as my first PCB project and it works great but I soldered wires to the new board ...
- 1
1
vote
2
answers
94
views
Potentiometer - confusion about arrow direction
In this schematic, is the left pin of the potentiometer connected to 6 and the middle pin connected to 7 or vice versa?
- 35
1
vote
1
answer
95
views
PCBWay : Minimum SMT Width
Question
Is it bad design to alter the manufacturer-recommended VQFN footprint as follows:
• Pin copper width: 0.2 [mm] --> 0.3 [mm]
• Pin copper to copper spacing: 0.2 [mm] --> 0.1 [mm]
and if ...
- 437
13
votes
4
answers
2k
views
Which pin is pin #1?
Where is pin #1 on this IC?
It seems to have a line and a dot. The dot doesn't seem to line up with a corner pin though.
Chip is a INA210AIDCKR.
- 345
1
vote
0
answers
83
views
Electrical automotive pin
This pin came out of a 08 Honda Accord. I have been doing as much research as i can but to no avail haven’t been able to locate this type. The only markings on it are “B1”.Any info on to what type ...
- 269
2
votes
1
answer
380
views
Identify this connector and 2.5 mm pin type
Can you identify the connector type, and more important the pins?
I was able to find NPP 2.5 mm pins that look the same, but apparently they are smaller than what I need... I'm attaching some photos ...
0
votes
0
answers
83
views
What to do with unused pins in PCB board of Raspberry Pi 4 Compute Module?
I'm trying to make a PCB board for Raspberry Pi 4 Compute Module and I will only use power pins, one HDMI connector pins, one USB connector and UART pins (Tx and Rx) only. The rest of the pins will ...
- 99
1
vote
1
answer
53
views
Identifying a connection terminal specification from photo
I'm having difficulty identifying the 12 pin connection as seen in the photos below.
It appears to be a JST, but upon purchasing some 12 pin JSTs, they do not fit and are too big.
Is there a way to ...
- 23
1
vote
1
answer
187
views
Looking to identify this 3-pin connector
These connectors are from a Blackburn X8SL mountain bike light system. The sheathing is rotting and I am looking for replacement wiring and connectors. I search for 3-pin IP67 type connectors and ...
- 11
0
votes
1
answer
40
views
How much current can AS6C6416 static RAM data pins source?
I saw this video where the presenter uses static RAM data pins to source current to LEDs.
I want to try this, but I have AS6C6416 chip. My question is – will this not damage the chip? I checked the ...
- 3
4
votes
2
answers
1k
views
How to identify and repair what I need to fix this pin connector?
This is an 8-pin connector from a home generator and I need to re-attach a wire that was pulled out. The other side (pins) are attached to a control panel with fitting so I don't think I can replace ...
- 51
0
votes
0
answers
62
views
Name of 16 pin male connector
I searched everywhere, but I don't know how to describe this black connector for google query. This connector has 16 pins.
- 101
0
votes
1
answer
112
views
Ribbon Cable Pin Assignment
Preface: I am complete novice at electronics and this is my first project.
I am trying to connect two PCB together with a 10pin ribbon cable. The ribbon cables I made (and bought) are all showing ...
0
votes
1
answer
66
views
ATmega - reading PIN defined as PORT
What value reads the ATmega328 in case:
DDRA = 0xff;
PORTA = 0x00;
pin_state = PINA;
another words, what is state of PIN if I/O is defined as output PORT and all ...
- 2,901
1
vote
2
answers
107
views
Unknown female pins - solder cups
I am trying to replicate a female connector by means of 3d printing, using my own pins.
This is the connector that I want to replicate:
Just the inside, not the circular part that surrounds it.
If ...
- 1,399
4
votes
2
answers
680
views
Shorting (connecting) two pads that are on opposite sides of the PCB
I have a PCB that has two rectangular pads on either side of the PCB, exactly opposite to each other. They need to be temporarily shorted (connected) to allow setting of some parameter through ...
- 41
0
votes
2
answers
197
views
How does the OV pin protect against overvoltage?
This is the first time I've come across such pins on an IC. With a quick search, they are overvoltage supervisor pins hence to protect against overvoltage.
I was studying a power MUX TPS212x. The ...
- 121
0
votes
2
answers
208
views
What is the reason that this RJ11 cable can't be connected to this socket? [closed]
I connect one end of this RJ11 to my router's WAN port, and I connect the other end of it to a 3-pin plug, and I connect that 3-pin plug to the phone jack, but when I try to connect the RJ11 cable to ...
- 9
1
vote
1
answer
60
views
A question about pad footprint
I want to make a PCB for the pins of this unit:
So the pins at the bottom of the unit will be soldered to a custom PCB. In the bottom it is shown that the pin diameter is 0.5mm. When making PCB pads ...
- 2,255
0
votes
0
answers
128
views
ST ROM Bootloader boot0 pin
How is the boot0 pin is intended to be used by ST chip designers in real world applications? Once the boot0 pin is set high, the chip executes the bootloader section in memory and it will not go back ...
- 1
1
vote
1
answer
179
views
MCU floating pins
You'll have to excuse my ignorance I'm learning as I go along.
I would like to use a switch to toggle the state of the ESP32_EN pin in the schematic from high to low, however the pin can not be left &...
- 11
4
votes
1
answer
188
views
BASYS3 FPGA pin planning and configuration question
I have designed a basic 8-bit CPU that is mapped onto FPGA fabric on a Digilent BASYS3 development board. The DRC results in a few error messages that I do not understand, with one of them being shown ...
- 1,583
1
vote
0
answers
62
views
USB 3.1 port wiring for charging
I'm building an USB charger with a linear PSU just for hobby and I want to install an USB 3.1 port so it can supply 900 mA max.
If I only connect up the USB 3.1 port VBUS and GND pins, will the device ...
user331662
2
votes
1
answer
1k
views
What is pull up and pull down on a pin?
I am not getting clarity on how pull up, pull down, and GPIO values work.
If a pin is input and pull up, does it make the value 1?
If a pin is input and pull down, does it make the value 0?
If the ...
- 23
2
votes
1
answer
168
views
How to work with `WR` signal; incorrect datasheet for NEC FC40X2EA-AB VFD?
(Caveat: I'm a programmer, not an electronics engineer.)
Edit: Fixed a misunderstanding, added better smallest possible sample code.
I'm in the process of repurposing an old device containing a 2x40 ...
- 197
0
votes
0
answers
65
views
How can I get these pins description?
How can I get these pins' descriptions? I researched on the internet a lot but I couldn't find anything. Here is the datasheet PDF download link and website.
I specially need camera control pins. I ...
- 1
-1
votes
2
answers
221
views
I am designing a device using a MCP73871 and I am unsure on how to connect the status pins to the ESP32 MCU
I need a bit of help for my device schematic, more specifically for the status pins of the MCP73871. I am a beginner so I am trying to understand how to do it properly. The pins are PG, STAT1/LBO and ...
0
votes
0
answers
32
views
Can I use the Analog pins on Arduino micro as digital pins? [duplicate]
Can I use the Analog pins on Arduino Micro as digital pins? if Yes are there any Analog pins I cant use as digital pins on the Arduino micro?
- 33
1
vote
1
answer
65
views
SMD pin component tip? [closed]
I'm looking for something like a metal pin that could be assembled on a flex PCB. SMD or through hole. I want to use it to twist and then solder a thin (1e-4) copper wire to. What component am I ...
- 507