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O P E R A T I N G I N S T R U C T I O N S
Mini-USB to UART Converter
Item no. 19 73 26
Intended Use
This product serves to connect a device with a UART interface to a USB port (USB1.1 or
USB2.0). The converter can convert interfaces with a TTL level (5V) and 3.3Volt level to USB.
The converter circuit board is welded directly or through a socket rail e.g. to a conductor plate
or contacted via a socket rail (grid size 2.54 mm).
This product complies with the applicable national and European specifications. All company
names and product names are trademarks of their respective owners. All rights reserved.
Scope of Delivery
• Mini-USB to UART Converter
• CD with driver
• Operating instructions
Safety Notices
The guarantee/warranty will be void if damage is incurred resulting from
non-compliance with the operating instructions. We will not assume any
responsibility for consequential damage!
Nor do we assume liability for damage to property or personal injury
caused by improper use or failure to observe the safety instructions. In
such cases the warranty/guarantee is voided.
• For safety reasons, any unauthorized conversion and/or modifications to the product are
not permitted.
• The product is not a toy and must be kept out of the reach of children.
• The product must not become damp or wet. It is approved only for operation in dry rooms.
• Do not leave packaging material lying around carelessly. It might become a dangerous toy
for children!
Pin assignment
Pin Number
Description
X1
TTL Driver input (connect to GND when not used!)
X2
TxD 3.3Volt
X3
RxD
X4
TxD 5Volt TTL
X5
GND
X6
VBUS USB-Power Output +5Volt/ 100mA
Signal Level 3.3V
w w w. c o n r a d . c o m
Version 11/09
Signal Level 5V TTL
3.3V and 5V Levels:
There is a 3.3V level (TxD) at pin X2. If your application requires a TTL level (5V), you need
to connect pin X2 to pin X1. Then you can get the TTL level from pin X4 (TxD_5V).
When the TTL driver is not required, connect pin X1 to GND!
The RxD pin X3 can always process signals between 3V and 5V. It is not dependent on the
TxD driver wiring!
When connecting a USB connection cable, make sure that the cable connections
are established correctly. In case of polarity reversal, not only the converter is
destroyed but also the corresponding USB port. Loss of warranty/guarantee!
Software Installation
First install the enclosed driver software!
Then connect the converter to the USB port.
Technical data
Supply voltage: ................................................. +5V/DC via USB
Power input depending on baud rate: ............. Max. approx. 100mA
TTL-TxD level: .................................................. Between 4.5V and USB-Vcc
Permissible ambient temperature: ................... 0°C to +60°C
Permissible relative moisture: .......................... 20 to 80%, non-condensing
Dimensions: ...................................................... approx. 18 x 16 x 15mm
Disposal
Dispose of the product at the end of its service life in accordance with the current
statutory requirements; e. g. return it to any suitable collecting point.
These operating instructions are a publication by Conrad Electronic SE, Klaus-
Conrad-Str. 1, D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in
electronic data processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in technology and equipment
reserved.
© Copyright 2009 by Conrad Electronic SE.
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