Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain this part

Write a part description

Describe each pin

Verify Part Details

Recommend similar parts

Check availability & lifecycle

how do I connect U1 and IC1?

kkonline

@copilot how do I connect U1 and IC1?

copilot

To connect the STM32 microcontroller

U1

(STM32F031F6P6) with the USB to UART bridge

IC1

(CH340C), you would typically make the following connections for a UART communication setup:

Transmit (TX) and Receive (RX) lines:
- Connect $U1$ :PA2 (USART1_TX) to $IC1$ :RXD.
- Connect $U1$ :PA3 (USART1_RX) to $IC1$ :TXD.
Power Supply:
- Ensure $IC1$ is powered by connecting its VCC pin to your system's power rail, such as 3.3V or 5V, depending on your configuration. You can connect $IC1$ :VCC to $3V3$ if you are using 3.3V.
Ground:
- Connect $U1$ :VSS to $IC1$ :GND and also to the common ground ( $GND$ ) of your circuit.

This setup should facilitate basic UART communication between the STM32 microcontroller and the CH340C USB to UART converter. If you have specific configuration requirements or additional control signals, let me know, and we can adjust the connections accordingly.

kkonline

do i need any more components ?

copilot

Depending on your application and the specifics of your circuit design, you might consider adding a few additional components for better operation and reliability:

Decoupling Capacitors:
- Add a small bypass capacitor (e.g., 0.1 µF) close to the VCC pin of the CH340C to help filter out noise on the power supply line.
Pull-up Resistors:
- If your USART1_TX and USART1_RX pins might need to be weakly tied to a high level when not driven, pull-up resistors (e.g., 10k ohm) could be added. However, this is generally not necessary unless specified by your application.
Current-Limiting Resistor:
- Sometimes, a series resistor (e.g., 330-1k ohm) is added on the TX and RX lines to limit current in case of voltage level mismatch or short circuits.
USB Connection:
- Make sure you include the necessary USB data lines (UD+ and UD-) connections:
  - Connect $IC1$ :UD+ and $IC1$ :UD- to your USB connector's D+ and D- pins, respectively.
Optional Signal Lines:
- If you require additional UART control like RTS/CTS, you can connect $IC1$ :~RTS and $IC1$ :~CTS to the respective lines if used by your microcontroller configuration.

These components will depend on the specifics of your design and applications, like any possible interference, noise considerations, and whether you're implementing further control signals or power management protocols. Let me know if your project has any additional requirements!

kkonline

how to add current limiting resistor

copilot

To add a current-limiting resistor to the TX and RX lines, you can follow these steps:

Determine Resistor Value:
- A common value for current-limiting resistors in digital lines is between 330 ohms and 1k ohms. The exact value depends on your specific application and system requirements.
Place the Resistors:
- For TX Line:
  - Place a resistor ( $R_{TX}$ ) between $U1$:PA2 (USART1_TX) and $IC1$:RXD.
  - Connect R_TX:1 to U1:PA2.
  - Connect R_TX:2 to IC1:RXD.
- For RX Line:
  - Place another resistor ( $R_{RX}$ ) between $IC1$:TXD and $U1$:PA3 (USART1_RX).
  - Connect R_RX:1 to IC1:TXD.
  - Connect R_RX:2 to U1:PA3.
Verification:
- Ensure that the resistors are in series with the signal lines and that their values will not negatively affect signal integrity or result in voltage divider concerns with any parallel loads.

Adding current-limiting resistors helps protect against short circuits and manage signal integrity across longer traces or cables. Let me know if there's anything else you need!

kkonline

like so?

copilot

Certainly! Here's a concise representation of how you would add current-limiting resistors to your circuit for the TX and RX lines between the STM32 microcontroller and the CH340C USB to UART bridge:

TX Line:

Resistor: $R_{TX}$
- Connect R_TX:1 to U1:PA2 (USART1_TX).
- Connect R_TX:2 to IC1:RXD.

RX Line:

Resistor: $R_{RX}$
- Connect R_RX:1 to IC1:TXD.
- Connect R_RX:2 to U1:PA3 (USART1_RX).

Additional Considerations:

Value: Choose a resistor value between 330 ohms and 1k ohms based on your design requirements.
Placement: Physically place the resistors close to the microcontroller's pins to minimize any potential parasitic effects.

This structure ensures that both TX and RX lines have current-limiting resistors included in their paths, offering protection and enhancing signal integrity. Let me know if you have further questions!

kkonline

also what else does ic1 need except for the usb connector, to effectively have this as a microcontroller where i can flash arduino code

copilot

To use the CH340C as a USB to UART bridge for flashing Arduino code onto a microcontroller, you will need to consider the following additional components and considerations:

USB Connector:
- As you've mentioned, connect the USB data lines:
  - Connect $\text{IC1:UD+}$ to the USB connector's D+.
  - Connect $\text{IC1:UD-}$ to the USB connector's D-.
- Connect the USB connector's VBUS to the power supply (ensure proper voltage regulation if needed).
Decoupling Capacitor:
- Add a decoupling capacitor (typically 0.1 µF) close to the power pins of the CH340C to stabilize the power supply.
Voltage Regulation:
- If your microcontroller operates at 3.3V and the CH340C is supplied via a USB 5V line, ensure that voltage is appropriately regulated to match your microcontroller's needs.
Reset Circuit:
- Implement an automatic reset circuit with a resistor and capacitor (or a transistor) connected to the microcontroller's reset pin to facilitate the upload process.
- The RTS or DTR pin from the CH340C can be used to trigger the reset.
LED Indicators (Optional):
- Add LEDs with current-limiting resistors connected to the TX and RX lines to indicate data transfer activity.
Boot Mode Configuration:
- Ensure the microcontroller is in the correct boot mode for uploading code. This might involve setting a boot mode pin like BOOT0 on the STM32 to the appropriate level.

Example Connections:

Reset Circuit:
- Connect a capacitor (e.g., 100nF) from $\text{CH340C:~DTR}$ to the microcontroller's reset pin, with a resistor (e.g., 10kOhm) pulling up the reset pin to VDD.
LEDs:
- Connect an LED in series with a 330-ohm resistor from $\text{IC1:TXD}$ to ground (one end of the LED to TXD and the other through the resistor to ground).

These additions will help ensure successful programming, debugging, and operation of your microcontroller with the CH340C as the interface. If you have specific configuration requirements for components or setup let me know!

IC1

U1 VSS - IC1 GND

U1 PA2 - IC1 RXD

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
15.8k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Project Name

STM32F03 template board kKWN

Description

This is example board for creating cool projects with stm32 (this board based on STM32F031F6P6) #stm32 #arm #f0 #module

Properties

Designator Prefix

License

creativecommons.org/licenses/by/4.0/

Pricing & Availability

Distributor	Qty 1
Arrow	$1.22–$1.29
Digi-Key	$2.55–$3.31
LCSC	$2.00–$2.02
Mouser	$2.74
Verical	$1.22–$2.55

Controls

Welcome 👋

Flux helps you build PCBs faster with an AI teammate!

Create your account to collaborate, stay updated, fork your own version, and get instant answers from our AI agent.

kkonline / STM32F03 template board kKWN

Schematic