Questions tagged [fpc]
Questions regarding Flexible Printed Circuits. This is opposed to standard PCBs made of solid copper clad boards.
91 questions
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How to design a flex PCB with 4 I2C sensors?
I am trying to design a 4 direction TOF array with a single I2C bus. The implementation will be on a flex PCB with the sensors being mounted on stiffeners.
Sensor : VL53L1
I will use the XSHUT pin on ...
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117
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Adhesive used on FFC cable
What type of adhesive is suitable for bonding the tabs back onto FFC cables? (Picture included)
I have attempted with Cyanoacrylate (Super glue) in the past without success.
Context:
The adhesive on ...
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Unexpected Loss In Signal Integrity
For a project I'm working on, I wanted to clone this e-paper driver board and eventually integrate it into my project's board.
Here's a part of the schematic:
However, with my custom prototype clone ...
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Is there flux that doesn't brown under heat?
Adding flux (MG8341) to rework a component is resulting in ugly brown stains as shown in the picture below; this is a flexible circuit board with white cover-lay. The flux started to turn brown add ...
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Using flex PCB for RF signal instead of coax cable
I have been looking into reducing the number of different cables needed for my project: I have a couple of photodiodes on separate boards, with a total of 7 analog outputs. They have signal bandwidths ...
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Double contact FPC connector
For an LCD, I got this connector F31L-1A7H1-11015 and in datasheet, it says the connector is double contact point connector, however when I insert the flex PCB of the LCD into this connector, the top ...
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84
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Handling flexible PCB coverlay openings in fine-pitch footprints
I'm trying to understand how to handle fine-pitch pads on flexible PCBs. For example, a LIS2DH12 accelerometer uses an LGA-12 (2mmx2mm) footprint with 0.25mm wide pads on a 0.5mm grid.
I'm doing a ...
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Help needed identifying this 180 degree bottom insertion ffc connector and how to release the cable
I could not see any hinge or flap or other release mechanism. The connector seems like it is one piece of plastic with no obvious seams although in some images I think tooling marks look a bit like ...
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FPC design Flex PCB
I want to design a flex PCB to stick a membrane keypad onto the back of a regular PCB. We want the two sections: one for power, LEDs, etc., and one flex PCB for just the keys.
How may I design the FPC ...
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FFC connector with solder terminals on cable entry side
Are there any FFC connectors that have all solder pins on the same side as the FFC slot (i.e. where the FFC cable is inserted).
I know in most situations / designs this wouldn't make any sense, but I ...
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How to specify the stiffener for ordering Flex-PCBs at JLCPCB
I have a Flex-PCB design that contains several areas that are supported by stiffeners. I am trying to order the PCB at JLCPCB but can not figure out how to specify the areas where the stiffener is ...
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LCD Display with FPC to Arduino
I’m very new. My game is push button, but it’s important that the display is transparent.
I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
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449
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Fixing an 0.5 mm pitch, 18-pin FPC tear
I accidentally tore my Lego EV3's LCD FPC (Flexible Printed Circuit) while opening it.
The FPC is a 1.0mm 18-pin-pitch FPC which near the end is converted to a 0.5mm one.
I found this post in the ...
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FPC connector name
I am trying to make microscope from my old Xiaomi Note 10. I made kiosk mode android app. But to make it really convenient I have to move camera away from screen.
So I am exploring options to make ...
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Is there a standard for FPC pin numbering direction?
Is there a standard for FPC connector pin numbers? (ie: which end is pin 1)
I'm trying to design a PCB that uses an LCD display module with pin numbering such that when the cable is contact down and ...
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10-contact FPC socket has 12 PCB terminals
I have to place an FPC socket on my PCB. I selected 0.5 pitch and 10 contacts connector. Everyone has 12 PCB terminals instead of 10.
I am confused, what are those two extra pins for?
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What schematic symbol is used for a flex cable?
Generally asking, but primarily for KiCad, what is the schematic symbol typically used for FPC/FFC/flex cables?
That is to say, the flat end which is sometimes stiffened and does not have a connector ...
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Flex PCB controlled impedance
I am absolutely new to flex PCBs. I saw some from time to time but never designed one myself.
Now I'd like to get into this topic and the first task would be to create a ~ 10cm board to board ...
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Most probable cause for unwanted capacitance on serial line?
I'm a PCB rookie and just got the first sample of a 4 layer flex-rigid board that I made.
I'm using 3.3V TTL-UART @ 115200 baud, the stackup is as follows:
CU 35 (signal)
Prepreg 0.7mm
CU 35µm (GND)
...
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Confirm FFC pinout for forward and reverse direction
The first timer is using FFC so I would like to know about the pinout of the FFC forward and reverse cable. Below is an image from eBay showing both types; I have annotated pin1.
Is my understanding ...
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Flex boards routing inside device housing [closed]
I have seen several dslrs such as Nikon teardowns and I really admire the way they design the flex cables and FPCs. What I'm wondering is how do they manage to design such complex flex shapes
folded ...
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Impedance matching and termination on a flexible PCB carrying a 4.8 MHz clock signal, need stack up recommendations
I need some expert advice and I trust I can get it here. I am in the process of designing a system that uses a PDM microphone connected to the the microcontroller via a flexible PCB (4.8 MHz clock ...
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Is there any way to get 2 sided FPC with stiffener?
We need to design an FPC board that consists of components like mezzanine connectors that are centered on 2 sides, top and bottom layers. We have concerns about attaching the FPC board to the main PCB ...
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Joining two rigid PCBs in a non-flat configuration [closed]
I would like to design a very minimal split keyboard like the GergoPlex or Ferris Sweep, but my wrists get sore easily with extended pronation and ulnar deviation.
As such, the design I have in mind ...
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515
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How to open this FFC/FPC connector?
I am working on an old minidisc player (Sony MZ-E900) and the motor is connected via this FFC/FPC cable. I have downloaded service manual for this model and for this flexbile connector there is only ...
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202
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Using a straight end FPC connector for a tapered end FPC
I am new to working with FFC/FPC, and had a question about the different types of ends for these cables.
I have a piezomotor that connects via a 1mm pitch tapered end FPC. I need to connect this to a ...
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295
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What are these notches in an FPC for?
We are given these cute LCD displays (China made of course, drawing here on page 4.) There is a pair of notches on the connecting FPC. They are not next to the contacts (I've seen some connector ...
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450
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How to implement a Bookbinder PCB design in Altium
I am planning to design a bookbinder with airgap rigid flex PCB using Altium.
Based on guidelines from Altium, and various other sources, it is important to have "staggered lengths", to ...
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Microstrip on FPC board
Do anyone know, what is the strange track on FPC board on image below?
My guess is, it is something like a microstrip track.
The image is for a FPC board, that measure cell voltage of batteries.
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What are the concerns of vias-in-pad on flex PCB without filling?
My PCB fab said they can't fill the via-in-pad for flex PCB. The min hole size is 8mil with 20mil diameter. From google search, the concern is the solder will be drawn into an open via which could ...
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At what data rate should we consider PCB via back drilling? How about flex PCB?
Hello community member,
I have a 4 layer PCB. At what data rate should I consider via back-drilling? Also do we back-drill 3 layer flex PCB? Thanks.
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FPC connector pinout
I am thinking of using the 0526101633 FPC connector in my design.
I need 16 pins to be connected. When looking at the schematic symbol I am a bit confused as to which what does 1A and 1B mean. Are pin ...
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Can you physically connect an FPC to a FFC socket that has the same pitch but more circuits?
I'm interested if it's possible to make a 50 pin FPC breakout board and use it for cables of less pin count but of the same pitch?
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Does the impedance profile of flexible PCBs include the adhesive layers?
I'm looking at this page on PCBway and trying to get these values into Altium in order to get the right impedance profile.
As I understand, I should use the finished copper thickness to get the right ...
- 464
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Not detecting closed circuit in Goldtouch keyboard key presses
Context
While converting the Goldtouch Go!2 Mobile keyboard from Bluetooth to micro USB, I'm experiencing some difficulties in registering the keystroke signals coming out of the FPC connector.
Setup
...
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563
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How to design FFC's/FPC's Even/Odd pattern in Altium
I want to design the even/odd pattern of FFC (flexible flat cable) in Altium. I don't know the exact term used to describe it, but the recommended drawing of this FFC from its target connector's ...
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386
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Is the increase of impedance over a small hatch area on a FlexPCB negligible?
I have a FlexPCB with 4 layers and total thickness of about 200 µm. The second layer is a ground plane that is solid copper over the entire FlexPCB. To increase flexibility of the FlexPCB, I want to ...
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Does the signal to the NFC antenna require shielding?
My design requires a NFC antenna to be located on a different board and due to space limitations, a uFL connector can't be placed for a mini coax connection. A flex cable solves many of the design ...
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What kind of FPC is this, and what should I couple it with?
I'm working with these planetary geared micro stepper motors which come without a datasheet or any information from the sellers. I'm having a trouble figuring out how I should mate the FPC cable, can ...
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1k
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How do cheap Raspberry CSI-2 cables get around differential impedance matching
I am trying to design a circuit on (double sided) flex PCB that happens to have CSI-2 signals on it.
I would like to find out what is wrong with my deductions presented below, or what part of ...
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Trying to build custom electronics connection to a motorized zoom/focus lens
I'm a beginner when it comes to electronics, I had some success with pretty simple arduino based projects like blue tooth controlled stepper motor assemblies using well documented drivers and ...
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How to connect a flex ribbon cable to a screw terminal block?
Does anyone have ideas on how to mate a flex PCB with a screw terminal block?
Some background:
At my workplace, we're using the following Keysight DAQM900A Datalogger MUX cards:
In the past we've ...
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106
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Extension from OLED display to driver board
I have purchased this display for a prototype in development.
Product: https://www.displaymodule.com/collections/oled/products/2-8-256x64-monochrome-graphic-oled-display-module-spi-mpu
Datasheet: ...
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What is the mechanism of water damage to this flex circuit keyboard track?
I have a wireless Logitech keyboard which suffered water damage: after it got submerged in water, some keys stopped working. It was very strange to me, since I guessed that if some important element ...
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94
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Change FPC Pitch
I recently had a PCB made with a FPC on it. Unfortunately its the wrong pitch (Yes really stupid oversight) and so we need a solution that doesn't involve ordering a new board. The board has a 4 pin 0....
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Is it possible to mount a 7-Segment on an FPC and what points need to be considered?
I am designing a project with a flat flex PCB, in which I would need a 7-Segment display similar to below picture.
I would like to avoid to add an extra PCB with a connector or hot-bar just for the ...
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How to lay out Gerber files for rigid-flex PCBs
I want to move to rigid-flex PCB design for our product, to eliminate need for the FFC cables we currently use.
I have found vendors providing this service but I cannot find any information on how to ...
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1k
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Locally hatched ground plane to increase differential impedance
I am designing a flexible PCB to carry two types of differential signals. One is about 1.2Gbps 100R differential impedance, while the other is only 3Mbps, with much more tolerance on the impedance.
...
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Help identifying this damaged FFC/FPC connector
I am trying to identify this damaged connector on one of the PCBs of a Konica Minolta Vivid 910 laser 3D scanner. I wish to find a suitable match for replacement.
It connects the main logic board with ...
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436
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FPC Connector - Matebook X Pro
Please excuse me if this is not the right place to ask this question.
I have been looking for a specific ribbon cable (motherboard to LCD board) for my Huawei Matebook X Pro for more than a year now ...
