2 layers50 × 35 mm
2 layers30 × 12.8 mm
SWD Isolator
Neofoxx/SWD_IsolatorAn isolator for SWD programming. Useful for UART, I2C and others as well
- Size
- 30 × 12.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 13
- Pads
- 54
- Tracks, vias
- 137, 34
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 6 Dec 2020
- Updated
- 13 Mar 2021
Overview
SWD Isolator is an open-source printed circuit board by Neofoxx, from the Neofoxx/SWD_Isolator repository on GitHub. It is a 2-layer board of 30 × 12.8 mm with 17 parts on 13 nets, routed with 137 tracks and 34 vias.
It is built around the SI8605AC-AS1. Its parts include 8 resistors, 4 capacitors, 2 diodes, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
Main components
1README
README.mdSWD_Isolator
Generic isolator for SWD, I2C, UART, ...
PCB vie
Finished product
Schematic
Description
This is a quick'n'dirty isolator, that was used for SWD programming & I2C comms, with PSoC microcontrollers. It solves a very "sparky" situation, of connecting a mains earthed computer, to a device that does not have an earth (PE) connection. Because devices without a PE connections can be elevated by 1/2 mains voltage (so 115V in 230V systems), there is a real chance of zapping devices that get connected to it. This adapter solves that particular issue.
The chip has 2x open-drain bidirectional pins, making it suitable for a range of protocols. SWD, I2C and UART have all been tested. There are also two unidirectional pins (one to each side), but only one is used (as RESET) in programming.
The schematic calls for 3k resistors on bi-directional lines. In practice 820R resistors were used without issues, with good rising edges & high (couple of MHz) frequencies
The headers are aligned to a 0.1" grid - 0.9" from pin to pin. Headers can be soldered straight-through, or can be laid flat and soldered onto the exposed traces, making for a nice in-between module.
Files
- The Gerber files are in the HW/Gerbers directory
- The BOM is in the HW/ibom directory
- The schematic is here in the root directory
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 3k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1, R2, R4, R5, R7, R8 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R3, R6 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C2, C4 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C3 |
| 2 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J1, J2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2 |
| 1 | SI8605AC | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
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Questions
How big is the SWD Isolator PCB?
It measures 30 × 12.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SWD Isolator use?
17 parts, built around the SI8605AC-AS1. 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 SWD Isolator KiCad files?
From the Neofoxx/SWD_Isolator repository on GitHub, at the commit this page was made from: the board is HW/SWD_Isolator.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SWD Isolator design in my own project?
Its repository states no licence, so its author keeps all rights: ask Neofoxx before reusing the design.