2 layers24 × 27.9 mm
2 layers24 × 22.8 mm
UartHandshakeFEC
medo64/UartHandshakeFEC1Framework laptop expansion card exposing serial TTL interface with handshake signals
- Size
- 24 × 22.8 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 18
- Nets
- 18
- Pads
- 91
- Tracks, vias
- 190, 32
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 2 Nov 2023
- Updated
- 13 Nov 2023
Overview
UartHandshakeFEC is an open-source printed circuit board by medo64, from the medo64/UartHandshakeFEC repository on GitHub, published under the MIT licence. It is a 2-layer board of 24 × 22.8 mm with 18 parts on 18 nets, routed with 190 tracks and 32 vias.
It is built around the FT232RL and SM05T1G. Its parts include 4 capacitors, 3 resistors, 3 diodes, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
Main components
2
FT232RL
SSOP-28-208mil-40℃~+85℃ 3.3V~5.25V、4V~5.25V USB 2.0 USB to UART SSOP-28-208mil USB Converters ROHSFTDIUSB Converters
SM05T1G
SOT-2310uA 17A@8/20us 2 225pF 300W@8/20us 5V 7.3V 9.8V IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 TVS SOT-23 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdUART w/Handshake Framework Expansion Card
This Framework laptop expansion card will show up on your system as a serial device and allow for a non-isolated serial UART communication up to 3 Mbaud baud rate with all handshake signals exposed.
Please note that this card is not using RS-232 but TTL (either 3.3V or 5V) voltage levels (depending on the solder-jumper position).
UART Pinout
To connect to this board, one has to use a 7-pin JST XH connector. The following table represents the pinout, pin 1 being on the left as looking into the expansion card.
| # | Ref | Description |
|---|---|---|
| 1 | CTS# | Clear To Send Control Input |
| 2 | DSR# | Data Set Ready Control Input |
| 3 | RXD | Receiving Data Input. |
| 4 | GND | Ground supply |
| 5 | TXD | Transmit Data Output |
| 6 | DTR# | Data Terminal Ready Control Output |
| 7 | RTS# | Request to Send Control Output |
As power consumption is low, wires can be almost any AWG. I would recommend using 24 AWG wire 0.25 mm² as they allow for greater compatibility with other connectors.
Supported Speeds
This board employs the FT232R as its UART chip, and consequently, it supports all the baud rates this chip can handle. The table below lists the standard baud rates.
| Baud rate | Actual | Error | Divisor |
|---|---|---|---|
| 300 | 300 | 0.00% | 10000.000 |
| 600 | 600 | 0.00% | 5000.000 |
| 1,200 | 1,200 | 0.00% | 2500.000 |
| 1,800 | 1,800 | 0.00% | 1666.625 |
| 2,400 | 2,400 | 0.00% | 1250.000 |
| 4,800 | 4,800 | 0.00% | 625.000 |
| 7,200 | 7,201 | 0.01% | 416.625 |
| 9,600 | 9,600 | 0.00% | 312.500 |
| 14,400 | 14,406 | 0.04% | 208.250 |
| 19,200 | 19,200 | 0.00% | 156.250 |
| 28,800 | 28,812 | 0.04% | 104.125 |
| 38,400 | 38,400 | 0.00% | 78.125 |
| 57,600 | 57,692 | 0.16% | 52.000 |
| 115,200 | 115,385 | 0.16% | 26.000 |
| 230,400 | 230,769 | 0.16% | 13.000 |
| 460,800 | 461,538 | 0.16% | 6.500 |
| 921,600 | 923,077 | 0.16% | 3.250 |
| 1,000,000 | 1,000,000 | 0.00% | 3.000 |
While the UART chip does support baud rates up to 3 Mbaud, granularity of such rates is severely limited.
You can check my blog and other projects at www.medo64.com.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | SM05T1G | Medo64:D TVS SM05T1G (SOT23-3) | D1, D2, D3 |
| 2 | 100n | Medo64:C (0805) | C2, C3 |
| 2 | 1K | Medo64:R (0805) | R1, R2 |
| 1 | 105444-0001 | Medo64:P USB C 3.2 Edge (24w) | P1 |
| 1 | 10n | Medo64:C (0805) | C1 |
| 1 | 4u7 | Medo64:C (0805) | C4 |
| 1 | 5K1 | Medo64:R (0805) | R3 |
| 1 | 600R | Medo64:L (0805) | L1 |
| 1 | B7B-XH-A | Medo64:J JST XH Edge [UART] (7w) | J1 |
| 1 | FT232RL | Medo64:U Transciever UART FT232RL (SSOP-28) | U1 |
| 1 | Jumper | Medo64:JP Dual (1205) | JP1 |
| 1 | Medo64 | Medo64:ICON Medo64 | ICON |
| 1 | RX | Medo64:DS (0805) | DS1 |
| 1 | TX | Medo64:DS (0805) | DS2 |
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Questions
How big is the UartHandshakeFEC PCB?
It measures 24 × 22.8 mm and has 2 copper layers, 0.8 mm thick.
What parts does the UartHandshakeFEC use?
18 parts, built around the FT232RL and SM05T1G. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the UartHandshakeFEC KiCad files?
From the medo64/UartHandshakeFEC repository on GitHub, at the commit this page was made from: the board is src/UartHandshakeFEC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the UartHandshakeFEC design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).