2 layers34.3 × 49.5 mm
2 layers39.6 × 49.8 mm
Wr02sd
cat73220/PCBPCB Design
- Size
- 39.6 × 49.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 39
- Pads
- 141
- Tracks, vias
- 748, 114
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 25 Aug 2016
- Updated
- 9 Mar 2023
Overview
Wr02sd is an open-source printed circuit board by cat73220, from the cat73220/PCB repository on GitHub. It is a 2-layer board of 39.6 × 49.8 mm with 34 parts on 39 nets, routed with 748 tracks and 114 vias.
It is built around the CH340G and LM3940IMP-3.3. Its parts include 9 capacitors, 9 resistors, 5 connectors, 3 ICs and 2 switches.
Main components
2
CH340G
SOP-16-40℃~+85℃ 2Mbps 3.3V、5V USB 2.0 USB to UART SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
LM3940IMP-3.3
SOT-223-40℃~+125℃@(Tj) 1 10mA 1A 250uVrms 3.3V 5.5V 500mV@(1A) Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdPCB
PCB Design
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10K | Resistors_SMD:R_0603 | R3, R4, R5, R6, R7, R8, R9 |
| 2 | 100u | Capacitors_Tantalum_SMD:TantalC_SizeS_EIA-3216 | C4, C8 |
| 2 | 10u | Capacitors_SMD:C_0805 | C3, C6 |
| 2 | 22 | Capacitors_SMD:C_0603 | C1, C2 |
| 2 | THT_Male_P_1x15 | Pin_Headers:Pin_Header_Straight_1x15 | P1, P3 |
| 1 | 0.47u | Capacitors_SMD:C_0603 | C5 |
| 1 | 100K(1%) | Resistors_SMD:R_0603 | R2 |
| 1 | 12MHz | Crystals:Crystal_HC49-U_Vertical | Y1 |
| 1 | 220K(1%) | Resistors_SMD:R_0603 | R1 |
| 1 | 470 | Capacitors_SMD:C_0603 | C9 |
| 1 | 47u | Capacitors_Tantalum_SMD:TantalC_SizeS_EIA-3216 | C7 |
| 1 | CH340G | Housings_SOIC:SOIC-16_3.9x9.9mm_Pitch1.27mm | U1 |
| 1 | ESP-13-WROOM-02 | wroom02:ESP-13-WROOM-02 | U3 |
| 1 | Flash | Buttons_Switches_SMD:SW_SPST_EVQPE1 | SW1 |
| 1 | IN4007/M7(DO-214AC) | Diodes_SMD:DO-214BA | D1 |
| 1 | LM3940IMP-3.3 | TO_SOT_Packages_SMD:SOT-223 | U2 |
| 1 | Micro_SD_Card | wroom02:MICROSD | CON1 |
| 1 | POWER_5V | Connectors_JST:JST_PH_B2B-PH-K_02x2.00mm_Straight | P4 |
| 1 | Reset | Buttons_Switches_SMD:SW_SPST_EVQPE1 | SW2 |
| 1 | USB_A | USB_Micro-B | P2 |
The 30 most common of 34 parts.
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Questions
How big is the Wr02sd PCB?
It measures 39.6 × 49.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Wr02sd use?
34 parts, built around the CH340G and LM3940IMP-3.3. 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 Wr02sd KiCad files?
From the cat73220/PCB repository on GitHub, at the commit this page was made from: the board is wr02sd/wr02sd.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wr02sd design in my own project?
Its repository states no licence, so its author keeps all rights: ask cat73220 before reusing the design.