easybe/ez-uart-adapterAn USB-UART adapter that can power-cycle your board
Ez uart adapter is an open-source printed circuit board by easybe, from the easybe/ez-uart-adapter repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 45 × 15 mm with 23 parts on 30 nets, routed with 194 tracks and 21 vias.
It is built around the CH340C, AP2112K-3.3 and USBLC6-2SC6, with the AO3401A and MK-11C04-G013 among its other parts. Its parts include 8 resistors, 4 capacitors, 3 ICs, 3 transistors and 2 diodes. It belongs with the interfaces and adapters boards and the NXP (LPC, Kinetis, i.MX RT) boards of this library.
This CH340C-based board can automatically power up a (5V) target when
starting a serial console session. This is achieved by leveraging the
fact that DTR/ is automatically asserted when opening a port with a
terminal emulator like picocom or screen.
To check the design, run:
make checkTo generate the files for manufacturing:
make fab| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4, R5 |
| 2 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 2 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | 2k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R8 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | MK-11C04-G013 | ez-uart-adapter:SW-SMD_MK-11C04-G013 | SW1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J1 |
| 1 | green | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | red | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
It measures 45 × 15 mm and has 2 copper layers, 1.6 mm thick.
23 parts, built around the CH340C, AP2112K-3.3, USBLC6-2SC6 and AO3401A. 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.
From the easybe/ez-uart-adapter repository on GitHub, at the commit this page was made from: the board is ez-uart-adapter.kicad_pcb and its schematic ez-uart-adapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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