Isolated versatile FTDI

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Isolated versatile FTDI

by: DCEM

Inhaltsverzeichnis

Background

At some point I needed an isolated FTDI. Since I could not find one to buy, I designed one. After talking to some people in the hackerspace with different ideas about the project I designed it so that lots of options are possible with the design.

You can choose between the ADuM 1402 and the ADuM 5402. The 1402 will need some power on the isolated side while the 5402 can deliver up to 60mA via an internal isolated DC/DC converter.

I started with the design from sparkfun: FTDI Basic Breakout which I really liked, thanks for making the design open source, it saved me time.

Features

The features of this FTDI are:

  • galvanic isolation via ADuM 1402 or ADuM 5402 (that’s what all the fuzz is about :) )
  • small (15.1*0.61/38,4*15,5)
  • Micro-USB-B connector (these are the cables I carry around anyways)
  • 5V,5V switched, GND and FTDI connections in a 0.1 grid, so you can stack it onto a Universal PCB (stack a bigger DC/DC Converter for full 500mA for example)


The optional features of this FTDI are:

  • RX/TX LED for serial traffic indication (I always use low current LEDs to save power)
  • Shield connection via RC element
  • ESD Protection (USB) via SRV05 or Würth 82400102
  • PTC-Fuse 500mA (USB)
  • Instead of PTC-Fuse: Current Limiting Power Switch 500mA (MIC2005A-1YM5 or similar)
  • USB Bus Powered with Power Switching Configuration (see page 25 of the FT232R datasheet)


The optional features of this FTDI with the Adum5402 are:

  • Switch for output voltage selection (3.3V / 5V)
  • LEDs for voltage selection feedback (same colours as the cables in your ATX power supply ;) )
  • Current Limiting Power Switch 50mA to protect the ADuM5402 (MIC2090-1YM5 or similar)

Design Files

Circuit: Datei:Isolated versatile FTDI.pdf

Eagle files: Datei:Isolated versatile FTDI.zip

Finished PCBs


Stacking FTDI adapter with DC/DC converter (500mA)

Traco Power:

TMR 3-0511 5V

TMR 3-0510 3V3


Isolated FTDI DC-DC-Stack-Plan.png

Isolated FTDI DC-DC-Stack-Board 1.jpg Isolated FTDI DC-DC-Stack-Board 2.jpg

Isolated FTDI DC-DC-Board 1.jpg Isolated FTDI DC-DC-Board 2.jpg

Isolated FTDI DC-DC-Stack-without.jpg Isolated FTDI 5.jpg

PCBs

First PCBs are ordered and we will solder them in a few weeks. Progress:

Progress isolated versatile FTDI TOP 1.jpg Progress isolated versatile FTDI TOP 2.jpg Progress isolated versatile FTDI TOP 3.jpg Progress isolated versatile FTDI TOP 4.jpg Progress isolated versatile FTDI TOP 5.jpg

Progress isolated versatile FTDI BOTTOM 1.jpg Progress isolated versatile FTDI BOTTOM 2.jpg Progress isolated versatile FTDI BOTTOM 3.jpg Progress isolated versatile FTDI BOTTOM 4.jpg Progress isolated versatile FTDI BOTTOM 5.jpg


Bill of Materials / Jumper Configuration

basic

  • solder SJ_VE1
QuantityPart NameValue/Part NoSize
1 PCB
1USB Connector MICRO BZX62-B-5PA(11)
1.1 inch Header 6P
1 ADuM1402
1U1FT232RL
4C2, C3, C4, C6100nF0402
1C910µF1206

RX/TX LED for serial traffic indication

QuantityPart NameValue/Part NoSize
1LED_TXLED red (2mA)0603
1LED_RXLED green (2mA)0603
2R1, R22K20603

Shield connection via RC element

QuantityPart NameValue/Part NoSize
1R3330R0805
1C7220nF X7R0805

ESD Protection (USB)

QuantityPart NameValue/Part NoSize
1 SRV05

PTC-Fuse 500mA (USB)

  • cut SJ_VBUS
QuantityPart NameValue/Part NoSize
1PTC_FUSEPTC-Fuse 500mA1812

Current Limiting Power 500mA (instead of PTC-Fuse)

  • cut SJ_VBUS
QuantityPart NameValue/Part NoSize
1 MIC2005A-1YM5
1C51µF0603
1C9100µF1206

Power Switching Configuration

  • cut SJ_5V_SW
QuantityPart NameValue/Part NoSize
1Q1IRLML2244TRPBB
1R610K0603
1R71K0603
2C1, C8100nF0402

ADuM5402

QuantityPart NameValue/Part NoSize
1 ADuM5402
2C10, C1110µF0603

Switch for output voltage selection (3V3/5V)

  • cut SJ_V+_5V
QuantityPart NameValue/Part NoSize
1S1SSK-1202

LEDs for voltage selection feedback

QuantityPart NameValue/Part NoSize
1LED_3V3LED orange (2mA)0603
1LED_5VLED red (2mA)0603
1R42K20603
1R51K0603

Current Limiting Power Switch 50mA to protect the ADuM5402

  • cut SJ_V+
QuantityPart NameValue/Part NoSize
1 MIC2090-1YM5
1C1210µF0603

License

Licensing CC v3.0 Share-Alike (http://creativecommons.org/licenses/by-sa/3.0/)

Persönliche Werkzeuge