TURNING TECHNOLOGY INTO ART
4D SYSTEMS
microUSB Programming Adaptor
DATASHEET
uUSB-PA5
uUSB-PA5-II
USB to UART Serial Bridge
Document Date: 17
th
July 2015
Document Revision: 2.0
Uncontrolled Copy when printed or downloaded.
Please refer to the 4D Systems website for the latest Revision of this document
Contents
1. Description ............................................................................................................................. 3
2. Module Compatibility ............................................................................................................. 3
3. Features ................................................................................................................................. 3
4. Pin Configuration and Summary .............................................................................................. 4
5. Typical Applications ................................................................................................................ 5
6. Mechanical Dimensions .......................................................................................................... 6
7. Ordering Information.............................................................................................................. 7
8. Legal Notice............................................................................................................................ 7
9. Contact Information ............................................................................................................... 7
microUSB - μUSB-PA5
4D SYSTEMS
uUSB-PA5
1. Description
The microUSB Programming Adaptor is a USB to
TTL UART bridge converter which is simple, cost
effective, very small and easy to use.
There are 2 versions of the microUSB
Programming Adaptor, the uUSB-PA5 and the
uUSB-PA5-II.
They both use a mini-B type USB connector to
connect to your PC. The uUSB-PA5 is based on the
FTDI FT232RQ USB to Serial Bridge IC from FTDI
Chip, while the uUSB-PA5-II is based on the SiLabs
CP2104 USB to Serial Bridge IC from Silicon Labs.
From the perspective of programming 4D Systems
modules, both the uUSB-PA5 and uUSB-PA5-II
operate in the same way.
They provide the User with multi baud rate serial
data and access to additional signals such as flow
control in a convenient 10 pin 2.54mm (0.1”) pitch
Dual-In-Line package.
The main 5 pin interface is a standard 2.54mm
(0.1”) pitch female header, designed to connect
directly to a majority of the 4D Systems modules.
The uUSB-PA5 and uUSB-PA5-II are ideal for
prototype or production.
RX and TX signals are both 3.3V and 5V tolerant.
2. Module Compatibility
The uUSB-PA5 was designed in 2012. The uUSB-
PA5-II was designed in 2015 to replace the uUSB-
PA5.
While a large range of 4D Systems modules are
compatible with these programming adaptors,
some are not, for mechanical reasons.
The following is a small list is of known modules
that are not compatible with the uUSB-PA5/PA5-II.
uLCD-28PT (note, this is not the PTU)
uLCD-32PT (note, this is not the PTU)
microUSB - μUSB-PA5
Please use the 4D Programming cable instead, or
simply connect the 5 way cable that ships with
each module, between the uUSB-PA5/PA5-II and
the display module, which overcomes this
compatibility issue.
3. Features
USB 2.0 compliant Full Speed
maximum speed, Suspend supported.
12Mbps
Hardware or Xon/Xoff handshaking supported,
300bps to 3Mbps (uUSB-PA5), 300bps to 2Mbps
(uUSB-PA5-II)
UART supports 7 or 8 data bits, 1-2 Stop bits,
odd/even/mark/space and no parity (uUSB-PA5).
5, 6, 7, 8 data bits, 1, 1.5, 2 stop bits,
odd/even/mark/space and no parity (uUSB-PA5-II)
Power on reset circuit
Virtual COM port drivers allow operation with
existing COM port PC applications
Supports Windows 2000 and above, MAC (OSX-
8 and above) and Linux (2.4 kernel and above)
USB powered
-40 to +85 degrees Celsius temp range
Small size, 33.7mm x 17.3mm
Traffic/Operation LED indicates board status
Additional flow control and features available
for the user to solder, using standard 2.54mm
(0.1”) pitch through holes along each side of the
PCB.
RoHS Compliant
©
2015 4D SYSTEMS
Page 3 of 7
www.4dsystems.com.au
4D SYSTEMS
uUSB-PA5
4. Pin Configuration and Summary
microUSB - μUSB-PA5
microUSB (uUSB-PA5) additional Pin Outs
Symbol
RTS
DTR
RESET
TX
RX
CTS
SUSP
TXDEN
GND
+5V
Description
Ready to Send Output (active low)
Data Terminal Ready Output (active low)
This pin provides a LOW level RESET pulse of several hundred micro seconds when
the DTR signal is toggled.
Serial Data Transmit output. This connects to the host Rx (Serial Receive) input.
Serial Data Receive input. This connects to the host Tx (Serial Transmit) output.
Clear to Send Input (active low)
USB Suspend State (active low)
Transmit Data Enable, for enabling external circuits such as RS485 (active high)
Ground
+5V Power from USB (up to 500mA). Power supply to external circuits
microUSB (uUSB-PA5-II) additional Pin Outs
Symbol
RTS
DTR
RESET
TX
RX
CTS
SUSP
GPIO2
GND
+5V
Description
Ready to Send Output (active low)
Data Terminal Ready Output (active low)
This pin provides a LOW level RESET pulse of several hundred micro seconds when
the DTR signal is toggled.
Serial Data Transmit output. This connects to the host Rx (Serial Receive) input.
Serial Data Receive input. This connects to the host Tx (Serial Transmit) output.
Clear to Send Input (active low)
USB Suspend State (active low)
Set to Push/Pull for enabling external circuits such as RS485 (active high)
Ground
+5V Power from USB (up to 500mA). Power supply to external circuits
©
2015 4D SYSTEMS
Page 4 of 7
www.4dsystems.com.au
4D SYSTEMS
uUSB-PA5
5. Typical Applications
The microUSB (uUSB-PA5/PA5-II) are designed to accommodate many applications. Its small size and
convenient form factor are perfect for adding micro USB functionality to embedded applications.
Obviously the primary purpose of the uUSB-PA5 and uUSB-PA5-II is to be the programming interface for 4D
Systems products, however it has a much wider scope and can be utilized for many applications.
The microUSB makes an easy USB-Serial interface, so you can easily create USB to RS-232 converters, USB to
RS-422/RS-485 converters, upgrade legacy RS-232 devices, make PDA and cellphone USB interface cables,
barcode readers, POS terminals, etc.
In any application, make sure the TX and RX lines from the uUSB are crossed over to the attached peripheral.
That is, the TX from the μUSB connects to the RX of the target and the RX from the uUSB connects to the TX of
the target device.
Note:
the TX and RX signal levels are between 0 Volts and 3.3 Volts, however are 5.0V tolerant.
microUSB - uUSB-PA5
The microUSB is designed to have a compact footprint, and be compatible with prototyping such as plugging it
directly into a breadboard when male 2.54mm (0.1”) headers are soldered to the row of 5 pins, along each
side.
For assistance with latest driver downloads, please visit the uUSB-PA5 product page of the 4D Systems
website,
www.4dsystems.com.au
©
2015 4D SYSTEMS
Page 5 of 7
www.4dsystems.com.au
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