4 layers113.5 × 105.5 mm
Multistepper
eddyem/stm32samples
Code samples and ready projects based on bare-metal STM32
243 parts208
2 layers48 × 19 mm
Usb floppy adapter
roybaer/usb_floppy_adapter45STM32-based USB to Floppy-Disk Drive (FDD) Adapter
- Size
- 48 × 19 mm
- Copper layers
- 2
- Thickness
- 1.2 mm
- Parts
- 28
- Nets
- 50
- Pads
- 173
- Tracks, vias
- 511, 45
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 19 Feb 2018
- Updated
- 16 Sep 2020
Overview
Usb floppy adapter is an open-source printed circuit board by roybaer, from the roybaer/usb_floppy_adapter repository on GitHub. It is a 2-layer board of 48 × 19 mm with 28 parts on 50 nets, routed with 511 tracks and 45 vias.
It is built around the LM1117-3.3 and USBLC6-2SC6. Its parts include 7 capacitors, 7 connectors, 3 resistors, 3 ICs and 1 inductor. It belongs with the interfaces and adapters boards and the STM32 boards of this library.
Main components
2
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdUSB to Floppy-Disk Drive Adapter
This project provides the CAD files for an STM32-based floppy-disk controller that can be attached to the back of an ordinary 3.5 inch floppy-disk drive and connected to a USB host via micro USB port.
Hardware
The core of this adapter is the popular STM32F103C8T6 microcontroller by STMicroelectronics. Please consult the PDF schematic for details.
Configuration
The adapter can be used in several different hardware configurations that can be selected via solder bridges.
The following drive types are supported:
- PC drives
- IBM PS/2 drives
- drives with shugart interface
Drives that only use the 5V line and consume less than approx. 480mA can be powered via USB, other drives have to be powered externally.
| J5 | J6 | J7 | Use case |
|---|---|---|---|
| ▒▒░▒▒ | ▒▒░▒▒ | ▒▒░▒▒░▒▒ | PC drive, externally powered |
| ▓▓▓▓▓ | ▒▒░▒▒ | ▒▒░▒▒░▒▒ | IBM PS/2 drive without 12V line |
| ▒▒░▒▒ | ▓▓▓▓▓ | ▒▒░▒▒░▒▒ | PC drive, USB-powered |
| ▒▒░▒▒ | ▒▒░▒▒ | ▓▓▓▓▓░▒▒ | pin 4 and 6 shorted, for shugart drives that do not use pin 4 |
| ▒▒░▒▒ | ▒▒░▒▒ | ▒▒░▓▓▓▓▓ | 12V on pin 4, for PS/2 drive |
The power connector J3 can be used as either input or output.
Configurations other than the USB-powered PC drive (see picture) are untested.
Firmware
As of August 2020, there is no working firmware for this adapter, yet.
The objective is to adapt the firmware provided by the Greaseweazle project. It does already provide support for the same microcontroller, albeit for a much bulkier adapter with a different pinout.
Programming via Serial Wire Debug Interface
The adapter provides solder pads for an SWD programming device. They are labeled J4 on the PCB.
| Pin on J4 | Function |
|---|---|
| 1 | 3.3V |
| 2 | SWDIO |
| 3 | SWCLK |
| 4 | GND |
Software
Please refer to the Greaseweazle documentation for PC-side software that will be used with this adapter.
License
The following license applies to the files in this repository:
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100n | Capacitors_SMD:C_0603 | C4, C5, C6, C7 |
| 4 | R_Pack04 | Resistors_SMD:R_Array_Convex_4x0603 | RN1, RN2, RN3, RN4 |
| 3 | 10µ | Capacitors_SMD:C_0805 | C1, C2, C3 |
| 2 | 22 | Resistors_SMD:R_0603 | R2, R3 |
| 2 | GS2 | Connectors:GS2 | J5, J6 |
| 1 | 1.5k | Resistors_SMD:R_0603 | R1 |
| 1 | Conn_01x02 | Pin_Headers:Pin_Header_Straight_1x04_Pitch2.54mm | J3 |
| 1 | Conn_01x04 | Pin_Headers:Pin_Header_Straight_1x04_Pitch1.27mm_SMD_Pin1Left | J4 |
| 1 | Conn_02x17_Odd_Even | Socket_Strips:Socket_Strip_Straight_2x17_Pitch2.54mm | J1 |
| 1 | Ferrite_Bead | Inductors_SMD:L_0805 | L1 |
| 1 | GS3 | Connectors:GS3 | J7 |
| 1 | LM1117-3.3 | TO_SOT_Packages_SMD:SOT-223-3Lead_TabPin2 | U1 |
| 1 | MICRO_USB_B | Connectors_USB:USB_Micro-B_Vertical_Molex-105133-0001 | J2 |
| 1 | Resonator | Crystals:Resonator_SMD_muRata_SFECV-3pin_6.9x2.9mm | Y1 |
| 1 | STM32F103C8Tx | Housings_QFP:LQFP-48_7x7mm_Pitch0.5mm | U2 |
| 1 | USBLC6-2SC6 | TO_SOT_Packages_SMD:SOT-23-6 | U3 |
The 26 most common of 28 parts.
Questions
How big is the Usb floppy adapter PCB?
It measures 48 × 19 mm and has 2 copper layers, 1.2 mm thick.
What parts does the Usb floppy adapter use?
28 parts, built around the LM1117-3.3 and USBLC6-2SC6. 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 Usb floppy adapter KiCad files?
From the roybaer/usb_floppy_adapter repository on GitHub, at the commit this page was made from: the board is kicad/usb_floppy_adapter.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Usb floppy adapter design in my own project?
Its repository states no licence, so its author keeps all rights: ask roybaer before reusing the design.
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