© 2017 Exar Corporation
XR22414 EVB User’s Manual
4 / 8
www.exar.com\XR22414
Rev 1A
Uninstalled components on XR22414CV48EVB and XR22414CL48EVB
Both XR22414 EVBs have a number of components that are not installed. These components have a variety of purposes
and some may be installed after cutting the surface “shorting traces” which short across the pins of the devices when they
are not installed.
LED Indicators
Each USB port of the XR22414 EVBs has green and amber activity indicators. The upstream port has a single blue LED to
indicate any hub activity. The hub activity LED is lit when the hub is connected to a USB host. However, if there are no
downstream ports connected, following device enumeration and a short period of inactivity, the hub will be placed in sus-
pend state and the hub activity LED will not be lit. The 4 downstream ports have green LEDs for port activity and amber
indicators for error indications including over-current per USB 2.0 specifications chapter 11.
J13, J14, J19, J20
When J13, J14, J19 and J20 are installed from pin 2 to 3, the XRP2527
current monitors use USB 2.0 default trip voltage. If installed pin 1 to 2,
the current monitors trip at the value established by the resistance of the
RSET pin to ground using formula ILIM (trip current) = ~108.7 / RSET
resistance (kOhms).
By default, J13, J14, J19 and J20 are
installed pin 1 to 2.
J9
J9 selects normal hub operation port and hub activity indicators or
charging mode.
By default J9 is installed pin 2 to 3 for
normal hub operation and LED activity
indicators. Must be installed pin 1 to 2 to
enable charging mode.
F2, F3, F4
F1, F2, F3 and F4 may be used instead of, or in conjunction with the
XRP2527 current monitors. Only F1 is populated by default on the
XR22414 EVB with the intent that F1 may be used in global over-current
protection modes.
Only F1 is populated by default
Table 3: Uninstalled Components
Uninstalled
Components
J2 & J5
By default J2 and J5 are not installed. For power measurements, an ammeter may be installed by cutting
either the surface trace on J2 (when using the LQFP48 device) or J5 (when using the QFN48 device). J1 or
J2 can then be installed or an ammeter in series can be used for power measurements.
J3, J6
By default J3 and J6 not installed.
CM1 - CM5
Common Mode chokes on upstream and 4 downstream ports for EMI purposes.
R10- R19
R10- R19 are not installed on XR22414CV48EVB to prevent stubs on high speed USB traces.
C13. C14,
C21, C22, R27,
R28, R33, R34
C13. C14, C21, C22, R27, R28, R33, and R34 are not installed.
Y1 / Y2 and
R4 / R5
For the XR22414CV48EVB Y1 and R4 are not installed. For the XR22414CL48EVB Y2 and R5 are not
installed.
Table 2: Jumper Settings and components for PCB Power
Jumper
Description
Default
