XR22802 Datasheet, PDF (5/46 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge

Pin Configuration
XR22802
E30 1
E31 2
VBUS_SENSE 3
REXT 4
E29 5
E28 6
CAP1 7
GND 8
USBD- 9
USBD+ 10
VCC 11
E26 12
ETH_SPD 13
E27 14
Exar
XR22802
E_PAD
42 E7/TXA
41 E6/RXA/RWKA#
40 GND
39 E9/CDB#/GB1
38 E8/RIB#/RWKB#/GB0
37 E18
36 GND
35 CAP2
34 E19
33 ETH_LINK
32 E16
31 E17
30 E1/CDA#/GA1
29 E0/RIA#/RWKA#/GA0
Pin Assignments
Pin No.
Pin Name
1
E30
2
E31
3
VBUS_SENSE
4
REXT
5
E29
6
E28
7
CAP1
© 2015 Exar Corporation
Top View
Type
I/O
I/O
I
I
I/O
I/O
I
Description
Enhanced general purpose IO
Enhanced general purpose IO
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 con-
figured for self-powered mode. The VBUS_SENSE input is used to disable the pull-up resis-
tor 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
Enhanced general purpose IO
Enhanced general purpose IO
Connect externally to CAP2 and 3V3_OUT using short trace
5 / 46
exar.com/XR22802
Rev 1B