XR22804 Datasheet, PDF (7/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

XR22804
Pin No.
Pin Name
31
E17/CDC#/GC1
32
E16/RIC#/RWKC#/GC0
33
ETH_LINK
34
E19/DTRC#/GC3
35
CAP2
36
GND
37
E18/DSRC#/GC2
38
E8/RIB#/RWKB#/GB0
39
E9/CDB#/GB1
40
GND
41
E6/RXA/RWKA#
42
E7/TXA
43
E5/RTSA#/RS485A/GA5
44
E4/CTSA#/GA4
45
E14/RXB/RWKB#
46
E15/TXB
47
E13/RTSB#/RS485B/GB5
48
E12/CTSB#/GB4
49
LOW_PWR#
50
GND
Type
I/O
I/O
O
I/O
I
PWR
I/O
I/O
I/O
PWR
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
PWR
Description
Enhanced general purpose IO, or UART channel C Carrier Detect, or general purpose IO.
Defaults to UART GPIO input.
Enhanced general purpose IO, or UART channel C Ring Indicator, or remote wakeup, or gen-
eral purpose IO. Defaults to UART GPIO input. Refer to Remote Wakeup section on page 11.
Ethernet 10/100 Activity Indicator. Toggles with activity
Enhanced general purpose IO, or UART channel C Data Terminal Ready, or general purpose
IO. Defaults to UART GPIO input. Refer to Automatic DTR/DSR Hardware Flow Control sec-
tion on page 16
Connect externally to CAP1 and 3V3_OUT using short trace
Power supply common, ground
Enhanced general purpose IO, or UART channel C Data Set Ready, or general purpose IO.
Defaults to UART GPIO input. Refer to Automatic DTR/DSR Hardware Flow Control section
on page 16.
Enhanced general purpose IO, or UART channel B Ring Indicator, or remote wakeup, or gen-
eral purpose IO. Defaults to UART GPIO input. Refer to Remote Wakeup section on page 11.
Enhanced general purpose IO, or UART channel B Carrier Detect, or general purpose IO.
Defaults to UART GPIO input.
Power supply common, ground
Enhanced general purpose IO, or UART channel A RX data, or remote wakeup. Defaults to
UART RX data.
Enhanced general purpose IO, or UART channel A TX data. Defaults to UART TX data.
Enhanced general purpose IO, or UART channel A Request to Send, or auto-RS485 half-
duplex enable, or general purpose IO. Defaults to UART GPIO input except when XR22804 is
used with CDC-ACM driver. Refer to Automatic RTS/CTS Hardware Flow Control section on
page 15 or Auto RS-485 Half-Duplex Control on page 16.
Enhanced general purpose IO, or UART channel A Clear to Send, or general purpose IO.
Defaults to UART GPIO input except when XR22804 is used with CDC-ACM driver. Refer to
Automatic RTS/CTS Hardware Flow Control section on page 15.
Enhanced general purpose IO, or UART channel B RX data, or remote wakeup. Defaults to
UART RX data.
Enhanced general purpose IO, or UART channel B TX data. Defaults to UART TX data.
Enhanced general purpose IO, or UART channel B Request to Send, or channel B auto-
RS485 half-duplex enable, or general purpose IO. Defaults to UART GPIO input except when
XR22804 is used with CDC-ACM driver. Refer to Automatic RTS/CTS Hardware Flow Control
section on page 15 or Auto RS-485 Half-Duplex Control on page 16.
Enhanced general purpose IO, or UART channel B Clear to Send, or general purpose IO.
Defaults to UART GPIO input except when XR22804 is used with CDC-ACM driver. Refer to
Automatic RTS/CTS Hardware Flow Control section on page 15.
The LOW_PWR# pin will be asserted whenever it is not safe to draw the amount of current
requested from VBUS in the Device Maximum Power field of the Configuration Descriptor.
The LOW_PWR# pin is asserted when the XR22804 is in suspend mode or when it is not yet
configured. The LOW_PWR# pin will be de-asserted whenever it is safe to draw the amount
of current requested in the Device Maximum Power field. Note that the XR22804 device is a
high power device. The default polarity of the LOW_PWR# output pin is active low and is pro-
grammable via the OTP.
Power supply common, ground
© 2015 Exar Corporation
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exar.com/XR22804
Rev 1B