Alternative USB-to-3.3V-TTL-converter with integrated 3.3V 100mA regulator CP2102

StefanL38

Hi,

at ELV I found this USB to UART-bridge based on the CP2102 chip from silicon labs.
http://www.elv.de/Mini-USB-Modul-UM2102,-Komplettbausatz/x.aspx/cid_74/detail_10/detail2_28776
here I found a description
http://www.elv-downloads.de/downloads/Leseproben/Journal/03-2010/91859_um2102.pdf

After installing the driver downloading programs to RAM or EEPROM with the propellertool works fine.

advantages:
- cheap only 6 Euro,
- integrated 3.3V 100mA regulator = propeller can be USB-powered. No extra-regulator needed in low-power-applications.

disadvantages:
- no Rx-Tx-action output-pins for LEDs (like FTDI)
- worked only reliable on my notebook up to 256000 Baud (means ViewPort has to be slowed down to 115200 baud)

For Rx-Tx-indication I added a Dual-Op-Amp LM358 which is working as a voltage-follower
supplied with 5V, outputs directly connected to LEDs and +5V.
Connected to +5V the LEDs light up only if there is traffic on the Rx/Tx-line.

I can't remember from where I downloaded the description so I attached the file.

best regards

Stefan