- on Microcontrollers
- Published in issue 9/2011 on page 58
FT232R USB/Serial Bridge/BOB
And you’re also bound to appreciate that fact that it’s practical, quick to implement, reusable, and multi-platform (Windows, Linux, etc.) — and yet for all that, not too expensive.I don’t think much of the various commercially-available FT232R-based modules. Too expensive, too bulky, badly designed, … That’s why this project got designed in the form of a breakout board (BOB).
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Issued: October 10, 2011.
the metallised semicircles at the edge of the PCB is a feature of the BOB-FT232R. This advanced technology allows the vertical SIL connectors (supplied with the module) to be soldered, as well as the module itself to be soldered directly in "piggyback" fashion onto a board of your own design. To assist you with the design of a suitable footprint, a library for Eagle CAD software (http://www.cadsoftusa.com/) is provided free of charge on this web page.
To facilitate the soldering of the vertical connectors customers are advised to use a piece of dense foam (like antistatic foam used to hold through-hole components) or a breadboard, or a carrier PCB (if correctly drilled).
The 3.3 V or 5 V I/O level voltage MUST be defined. This is done with a drop of solder tin on the relevant SMD jumper position on the board. Be careful not to solder all pads together as that will damage the BOB board.
R1,R2 = 270Ohm (0603)
C1, C2 = 47pF (0603)
C3 = 10nF (0603)
C4 = 4.7?F 6.3V (0603)
C5, C6 = 100nF (0603)
L1, L2 = ferrite bead >30Ohm @ 100 MHz / 1.5 A (0603)
IC1 = FT232RQ
D1 (TX) = LED, green (0603)
D2 (RX) = LED, red (0603)
K1 = USB mini-B connector
18-pin (2x9) pinheader, right angled Pinheader