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PDF XR22800 Data sheet ( Hoja de datos )
| Número de pieza | XR22800 | |
| Descripción | Hi-Speed USB to 10/100 Ethernet Bridge | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XR22800 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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XR22800
Hi-Speed USB to 10/100 Ethernet Bridge
General Description
The XR22800 is a Hi-Speed USB 2.0 compound device with an embed-
ded hub and 3 downstream USB functions: 10/100 Ethernet MAC and
PHY, 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 multi-master capable I2C controller and EDGE controller (8 GPIOs)
can be accessed via the USB HID interface. The EDGE pins or I2C inter-
face 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
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-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
USB
25 MHz
XO
Upstream
USB Phy
OTP
Memory
USB
2.0
Hub
10/100
Ethernet
MAC
EDGE
Controller
Ethernet
Phy
I2C
Multimaster
Ethernet
I2C
EDGE
© 2016 Exar Corporation
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exar.com/XR22800
Rev 1C
1 page  
Pin Configuration
VBUS_SENSE
REXT
CAP1
GND
USBD-
USBD+
VCC
ETH_SPD
1
2
3
4
5
6
7
8
Exar
XR22800
E_PAD
24 E7
23 E6
22 GND
21 GND
20 CAP2
19 ETH_LINK
18 E1
17 E0
XR22800
Pin Assignments
Pin No.
Pin Name
1 VBUS_SENSE
2 REXT
3 CAP1
4 GND
5 USBD–
6 USBD+
7 VCC
8 ETH_SPD
9 XTALOUT
10 XTALIN
11 3V3_OUT
12 GND
13 ETH_TX–
© 2016 Exar Corporation
Top View
Type
I
I
I
PWR
I/O
I/O
PWR
O
O
I
PWR
PWR
O
Description
VBUS Sense input. In self-powered mode, the VBUS from the USB connector needs to be
connected to this pin through a voltage divider circuit (VBUS = 5V, VBUS_SENSE = 3.3V
input) using large resistance values to minimize power. It should also be decoupled by a 0.1uF
capacitor. This feature may be enabled via the OTP whenever the hub function is configured
for self-powered mode. The VBUS_SENSE input is used to disable the pull-up resistor on the
USBD+ signal when VBUS is not present. In bus-powered mode, this pin is ignored.
Connect externally using short trace to 226 ohm 1% resistor to ground
Connect externally to CAP2 and 3V3_OUT using short trace
Power supply common, ground
USB port differential data negative.
USB port differential data positive.
5.0V power supply input
Ethernet 10/100 Mbps Speed Indicator. Asserted high for 100 Mbps.
Crystal or buffered clock output.
25 MHz +/- 50 ppm Crystal or external clock input.
3.3 V output power. Connect externally to CAP1 and CAP2 using short trace and decouple
with minimum of 4.7uF capacitor
Power supply common, ground
Ethernet transmit data out negative
5 / 29
exar.com/XR22800
Rev 1C
5 Page 
XR22800
OTP
The OTP is an on-chip non-volatile memory, that is one-time programmable via the USB interface. Bit locations within the
memory may be programmed at various times allowing for customization of the XR22800. Some bits are pre-programmed
at the factory and caution must be taken not to program any locations except user defined addresses. Contact the factory
[email protected] for information and assistance in programming the XR22800 OTP.
© 2016 Exar Corporation
11 / 29
exar.com/XR22800
Rev 1C
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet XR22800.PDF ] | |
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