Freescale Semiconductor
Data Sheet: Advance Information
Document Number: USB2SERDS
Rev. 1, 10/2011
USB2SER
USB2SER Data Sheet
USB to UART Application Specific
IC
Introduction
Freescale Ready Play Solutions integrate a certified function
to different applications allowing customers to add features
while reducing development cost. This simplifies design
cycles and enables scalability in applications and systems.
The USB2SER is a USB to UART bridge controller on a
5 x 5 mm lead free QFN24. It is a simple low cost solution to
enable a USB for an embedded system with a UART port,
reducing external component counts. It supports USB 2.0 full-
speed and TTL RS232 or RS485 UART with options for
hardware flow control, Software Flow control (Xon-Xoff),
even or odd parity, and stop bits configuration.
Features
•
•
•
•
•
Single chip USB to UART Data Transfer (RS232 or
RS485)
USB specification 2.0 compliant, full speed
(12 Mbps)
User programmable custom baud rates from 300 bps
to 115200 bps
UART supports 8 bit data, 1 or 2 stop bits and odd,
even or no parity
RESUME signal to request a remote wake-up and
SUSPEND output to indicate that the device is in
suspended mode
Integrated 3.3 V regulator for a USB IO
Integrated Power-On-Reset circuit
Integrated 2 MHz – 48 Mhz clock multiplier PLL
Supports 2 MHz, 4 MHz, 6 MHz, 8 MHz, 12 MHz,
and 16 MHz external crystals with automatic crystal
frequency detection
USB bulk data transfer modes for data
communication
3 V to 5 V single supply operation
UHCI / OHCI / EHCI host controller compatible
•
•
•
•
•
•
Configurable password to protect the device from
additional parameter modifications
Data formats supported 8 bits data, 1 and 2 stop bits
Parity odd, even, no parity
Hardware flow control (RTC / CTS) or Software
Xon/Xoff flow control
RS485_TXEN signal to support RS485
USB and UART activity pins to indicate
communication activity and fail sequences
24-pin QFN
Case 1897
Drivers support
The USB2SER can act as a CDC standard device that
eliminates the need for custom drivers for operation when the
flow-control is not needed (only an INF file is required).
For flow control support, COM emulator drivers are available
for:
•
•
•
•
Windows XP 32-bits and 64-bits versions
Windows Vista 32-bits and 64-bits versions
Windows 7 32-bits and 64-bits versions
Linux Kernel 2.6.34 and higher
•
•
•
•
Additionally to the drivers, a software configuration tool is
provided to customize the Product ID, Vendor ID, Product
strings, current consumption parameters and password
protection option, to prevent further modifications to the
device information. For driver installation and software go to:
The GUI and Driver Installer at
www.freescale.com/usb2ser.
Package
USB2SER comes in a compact 5 x 5 mm Pb free RoHS
compliant QFN24.
•
•
•
•
Configurable USB VID, PID, and device
description strings in the internal flash
USB Compliant Device
This document contains information on a product under development. Freescale reserves the
right to change or discontinue this product without notice.
© Freescale Semiconductor, Inc., 2011. All rights reserved.
USB2SER is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID 10006196
Windows Certification
The Windows Logo Program is designed to address the current and future market needs of customers using the Windows
platform. The Windows logo signifies the compatibility and reliability of systems and devices with the Windows operating
system. It gives customers confidence that your product is thoroughly tested with Microsoft-provided tools and ensures a good
user experience.
Product with Windows 7 Logo assures compatibility and reliability. Indicates that our driver has been tested to
ensure that they meet Microsoft standards for Windows 7 as well as the quality level that ensures a good
Windows experience for end users.
Designed and tested for ease of use, better performance, and enhanced security on PCs running Windows Vista.
Certified for Windows Vista products:
•
•
Meet the technical requirements for superior experiences with photos, music, videos, games, and online
communications.
Ensure compatibility with other Certified for Windows Vista products.
Windows XP Certification indicates systems that provide hardware acceleration technology supporting
Windows XP Mode. Windows XP Mode allows legacy applications which require Windows XP to run in a
virtual machine instance on a Windows 7 PC.
USB2SER Data Sheet, Rev. 1
2
Freescale Semiconductor
Contents
USB2SER
Introduction....................................................................................................................
1
Features.....................................................................................................................
1
Drivers Support.........................................................................................................
2
Package
..................................................................................................................... 2
USB Compliant Device............................................................................................
2
Pins and Connections..................................................................................................
4
Block Diagram
.......................................................................................................... 4
Device Pin Out..........................................................................................................
5
Recommended System Connections....................................................................
5
Signals Description
.................................................................................................. 6
Power (V
DD
, V
SS
, V
SSOSC
, V
USB33
)......................................................................
7
Reset and System Initialization..............................................................................
7
VID and PID configuration
...................................................................................... 8
Functional Description
................................................................................................. 8
Crystal Frequency Auto-detection
......................................................................... 8
Operating errors
....................................................................................................... 9
RS232 Connections
................................................................................................. 9
UART Baud rates
..................................................................................................... 9
Flow Control Operation
......................................................................................... 11
Operation with commercial terminals for serial communication
..................... 11
Drivers and GUI..........................................................................................................
10
Graphical User Interface for Product Configuration..........................................
11
Windows Driver
...................................................................................................... 14
Linux Driver
............................................................................................................. 14
Appendix A – Electrical Characteristics..................................................................
17
Parameter Classification
....................................................................................... 17
Absolute Maximum Ratings..................................................................................
17
Thermal Characteristics
........................................................................................ 18
Electrostatic Discharge (ESD) Protection Characteristics
..................................20
DC Characteristics
................................................................................................. 20
Supply Current Characteristics
............................................................................ 21
Appendix B – Package information
......................................................................... 21
Appendix C – INF File
............................................................................................... 21
Appendix D – USB2SEREVB Layout, Schematics, and BOM.............................23
USB2SER Data Sheet, Rev. 1
Freescale Semiconductor
3
Pins and Connections
1
1.1
Pins and Connections
Block diagram
Reset
Suspend
Resume
System Control
Reset
Power Management
User Flash
512 Bytes
USB
Module
Endpoint
RAM
Full Speed
USB
Transceiver
USBDP
USBDN
EXTAL
XTAL
Clock Generator
Module
USB2SER
Engine
V
DD
V
SS
System Voltage
Regulator
UART RX
RAM
UART TX
RAM
TXD
V
USB33
USB 3.3 Voltage
Regulator
UART /
RS485
RXD
RTS
CTS
RS485 CTL
Figure 1. Device block diagram
1.2
Device pin out
Figure 2. USB2SER — 24-QFN Package
USB2SER Data Sheet, Rev. 1
4
Freescale Semiconductor
Pins and Connections
1.3
Recommended system connections
Figure 3. System connections working at 5 V
Figure 4. System connections working at 3 V
1
RC filter on RESET is recommended for EMC-sensitive applications.
regulator output is used for R
PUDP.
R
PUDP
can optionally be disabled if using an external pullup resistor on USBDP.
2
R
PUDP
is shown for full-speed USB only. The diagram shows a configuration where the on-chip regulator and R
PUDP
are enabled. The voltage
3
V
BUS
is a 5.0 V supply from upstream port that can be used for USB operation.
4
USBDP and USBDN are powered by the 3.3 V regulator.
5
When using internal V
USB33
as supply, there needs to be an external ca
p.
USB2SER Data Sheet, Rev. 1
Freescale Semiconductor
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