USB/TTL Serial Cable: Extension & Supplement
(Summer Circuits 2010 article)
Published in issue 403, July/August 2010
Two years ago, I presented here the USB/TTL serial conversion cables from FTDI — wonderful communication and debugging tools. The increasingly frequent use of ARM CPUs has led us to use the 3.3 V version in order to protect the ARM’s input/output ports intended for 3.3 V (unless otherwise stated; the data sheets are unclear about this... but better safe than sorry!)
From now on, the 3.3 V version of the USB TTL-232R cable will be available in the Elektor online shop with the reference 080213-92. The 5 V version is still available with the reference 080213-91. Resistors (SMD 0805)
R1 = 10 kOhm
Capacitors (SMD 0805)
C1 = 100nF
Semiconductor
IC1 = 74HCT4066 SMD version (e.g. Texas Instruments CD74HCT4066M)
Miscellaneous
S1 = 5-way DIP switch
S2 = pushbutton
K1 = 6-pin pinheader, right angled, lead pitch 0.1 inch (2.54mm)
K2 = 6-pin socket strip, right angled, lead pitch 0.1 inch (2.54mm)
K3,K4 = 6-pin pinheader, straight, lead pitch 0.1 inch (2.54mm)
K4, K6 = FASTON IC connector
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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