XR22804 Datasheet, PDF (1/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

XR22804
Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs
General Description
The XR22804 is a Hi-Speed USB 2.0 compound device with an embed-
ded hub and 7 downstream USB functions: 10/100 Ethernet MAC and
Phy, 4 UARTs, multi-master capable I²C controller, and an Enhanced
Dedicated GPIO Entity (EDGE) controller.
The upstream USB interface has an integrated USB 2.0 PHY and device
controller that is compliant with both Hi-Speed (480Mbps) and Full-Speed
(12Mbps) USB 2.0. The vendor ID, product ID, power mode, remote
wakeup support and maximum power consumption are amongst the val-
ues that can be programmed using the on-chip One-Time Programmable
(OTP) memory.
The 10/100 Ethernet MAC and PHY is compliant with IEEE 802.3 and
supports auto-negotiation, auto-MDIX, checksum offload, auto-polarity
correction in 10Base-T and remote wakeup capabilities.
The enhanced UART has a maximum data rate of 15 Mbps. Using a frac-
tional baud rate generator, any baud rate between 300 bps and 15 Mbps
can be accurately generated. In addition, the UART has a large 1024-byte
TX FIFO and RX FIFO to optimize the overall data throughput for various
applications. The automatic RS485 control feature simplifies both the
hardware and software for half-duplex RS-485 applications. If required,
the multidrop (9-bit) mode feature further simplifies typical multidrop appli-
cations by enabling / disabling the UART receiver depending on the
address byte received.
The multi-master capable I²C controller and EDGE controller (up to 32
GPIOs) can be accessed via the USB HID interface. The EDGE pins or
I²C interface can be used for controlling and monitoring other peripherals.
Up to 2 EDGE pins can be configured as a PWM generator.
FEATURES
 USB 2.0 Compliant Interface
 10/100 Ethernet MAC and Phy
 Enhanced UART
 I²C Multi-master
 Enhanced Dedicated GPIO Entity (EDGE)
 Single +5.0V Power Supply Input
 Regulated +3.3V Output Power
 Single 25MHz Crystal
 ±15kV HBM ESD Protection on USB data
pins
 ±8kV HBM ESD Protection on all other pins
 USB CDC-ACM, CDC-ECM and HID
compliant
 Custom Software Drivers
APPLICATIONS
 USB to Ethernet Dongles
 POS Terminals
 Test Instrumentation
 Networking
 Factory Automation and Process Controls
 Industrial Applications
Ordering Information – Back Page
Block Diagram
OTP
Memory
USB
Upstream
USB Phy
USB
2.0
Hub
25 MHz
XO
10/100
Ethernet
MAC
Ethernet
Phy
I²C
Multimaster
UART Ch A /
MUMUoAMdUoRAedRoATmedRTCmeTIChmOIChOBIhOB/ _{B/ /}
Modem IO
EDGE
Controller
Ethernet
I²C
UART Ch.
A, B, C, D
/ EDGE
© 2015 Exar Corporation
1 / 47
exar.com/XR22804
Rev 1B