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0answers
46 views

An STM32 based board with some confusing configuration [on hold]

This may come a little bit confusing but I will try to explain as clear as I can, thanks in advance. Now, there is a board (custom board not a commercial product) which shaped as a circle with ...
0
votes
2answers
112 views

STM32 MCU gets shorted

I've been trying to make a simple audio player using the STM32F302CBT6, however, the VCC and GND pins of the MCU keeps on getting internally shorted when a 3.3V power supply is provided and a faint ...
0
votes
2answers
94 views

How to design an STM32 board with UART over a USB connection?

Sorry if this seems a stupid question but I'm designing a custom PCB based on the STM32F303RE microcontroller and am slightly confused as to how the UART should be connected in the hardware in order ...
1
vote
1answer
51 views

Zero-R Resistor on XTAL pins

Looking at the schematics of the STM32F4-Discovery board page 28, whose screenshot is attached below.. there is a Zero Ohms resistor 'R25' which is shown in the circuit with the Crystal. And there is ...
-2
votes
2answers
108 views

THROUGH-HOLE PLATING problem [closed]

I'm making a stm32 board at home. How can I plate through holes low cost at home? Is there a low cost through hole plating kit?
1
vote
1answer
195 views

STM32F103C8T6 custom design check

Following the failure of my first board design, I designed the following STM32F103C8T6 board. I only routed the fundamental parts of the board(MCU,caps, crystal, regulator etc.) This is a 2-layer ...
-1
votes
1answer
113 views

May I build my own STM32 dev board? [closed]

I wanted to build my own linux dev board. To learn more about PCB design, design rules and how the process works from power to login screen in linux. I saw that the STM32 chip has free linux IDE for ...
0
votes
3answers
292 views

How many capacitors do I need in my PCB design?

I have designed a PCB that includes an STM32L1xx MCU, a Micro SD Card, a pressure sensor, an accelerometer, a battery 18650 type and a buck-boost converter for a stable output of 3.3V (ISL9120IRTNZ). ...
7
votes
6answers
2k views

Noisy signals with 2-layer PCB - What's wrong with my design?

For my master's thesis in computer science, I need to read out a TCD1304AP linear CCD sensor. A STM32 microcontroller with the circuit laid out on a breadboard gets the job done, but in order to make ...
4
votes
4answers
1k views

How to calculate 4 MHz crystal trace width on PCB?

I have no idea about how to draw crystal trace on pcb. I have stm32f0 chip and 4 MHz external crystal and 15 pF capacitor. Can you help me that how to get suitable trace for crystal trace? Should I ...
0
votes
1answer
134 views

STM32F103xxxx VFQFPN 36 pin package thermal pad, isolated or tied to ground?

Currently designing a PCB based on the STM32F103. The package is a VFQFPN 36 pin package, which also has a large thermal pad. The datasheet for this part does not appear to indicate a pin number or ...
3
votes
0answers
357 views

STM32F429ZIT6 with SDRAM IS42S16320F Read/Write Issue

I designed a board which is containing two SDRAM (IS42S16320F) and STM32F476ZIT6 MCU (and other components also). I can access the SDRAM but the data is changing independently from the code. My board ...
9
votes
2answers
1k views

Quad SPI PCB layout

I am trying to make a good layout for the Quad SPI NOR flash memory MT25QL256ABA1EW9-0SIT with the STM32 MCU. My problem is that I find the memory chip pinout quite inconvenient. I have managed to ...
3
votes
1answer
2k views

Microcontroller VDD and VSS pins are shorted. Does that mean the MCU is fried?

I recently created my own breakout board for a STM32F030R8T6 MCU. The attached image shows the PCB that I designed for it. There are no components, only top copper tracks that get connected to header ...
4
votes
2answers
421 views

Switching HV DC relay on crashes microcontroller

So I´ve designed a PCB for a Pre-/Discharge Circuit for a 400V DC system which is controlled by a STM32 microcontroller. When powered the program waits for 1s and then starts by switching the (...
2
votes
1answer
1k views

LSE 32.768 kHz oscillator on STM32L433 won't start reliably.

I'm using a 32.768 kHz crystal FC - 12M on a board with STM32L433 in a LQFP48 package. There are two 10pF C0G load capacitors used. The problem is that on one of the boards (I have two of this ...
2
votes
1answer
349 views

USB Specifications for PCB design.

I'm designing a board with a STM32F103CBT6 chip and I've been trying to figure out how USB works so I can have that extended out. Reading some specifications online has just left me with more ...
0
votes
2answers
1k views

STM32F411 Nucleo board - what the ferrite bead is used for?

I'm trying to design my own pcb for the stm32f411 and when i saw the datasheet of the stm32f411 ( http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00115249.pdf ) ...
1
vote
1answer
1k views

STM32F102 USB Programming

I am currently designing a board for a STM32F102 chip which needs to be able to use the USB bus to transfer data while the chip is running. However I also want to be able to program the chip through ...
10
votes
3answers
6k views

Choosing a SDRAM pcb layout

I'm working on a project with the quite new STM32F429 in LQFP208 package. I need to solder the first couple of prototype by myself for low budget reason. I choose this package so I could check myself ...
1
vote
1answer
1k views

PCB design of crystal/oscillator ok in this way?

I'm working on a 4-Layer PCB design for my quadrocopter. I'm using a STM32F407 and I need the 32 khz and 8 Mhz crystal. Is the pcb design of my crystal OK? My layer order: Sig1 VDD VSS Sig2 (...