Exar XR22414-EVB Manual de usuario

XR22414-EVB

Evaluation Board User’s Manual

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Introduction

The XR22414 evaluation board is for the Exar USB 2.0 4-Port hub in both the 48 pin LQFP and 48 pin QFN packages. This

manual is intended to guide users to use various functions and configurations of the hub device. Either the 48 pin LQFP

package or 48 pin QFN package EVB can be ordered as shown in Table 1.

Board Layout and Outline

Evaluation Board outline

Figure 1 shows the topography of the evaluation board. Either U1 or U2 will be installed depending upon the version of the

evaluation board.

Figure 1: XR22414 PCB Outline

Table 1: Ordering Information

Device Ordering Part Number Evaluation Board Ordering Part Number Device Package Device Location

XR22414CV48-F XR22414CV48EVB LQFP 48 U1

XR22414CL48-F XR22414CL48EVB QFN 48 U2

QFN

PWR

DS Port

CJUMP

LED

CAP

JUMP

LED

J8: 1-2 Self Power

2-3 Bus Power

LQFP

LED

CJUMP

LED

CAP

LED

CJUMP

LED

CAP

LED

CJUMP

LED

CAP

LED

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Evaluation Board Layout

Evaluation Board Picture

Figure 2: XR22414 PCB

Hardware Configuration

This section describes the default board settings, when shipped from the factory, and jumper settings that may be used to

reconfigure operation.

Differences between XR22414CV48EVB and XR22414CL48EVB

The XR22414 is available in two packages, a 48 pin LQFP and a 48 pin QFN. The two versions of the evaluation board use

the same bare PCB, but with different components assembled, which includes either the LQFP or QFN package. In order to

avoid trace stubs on high speed USB (480 MHz) nets, 0 ohm resistors are installed from the upstream and all four down-

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stream USB ports to connect to the QFN48 device for the XR22414CL48EVB. These resistors are not installed for the

LQFP48 EVB.

Power Configurations

The XR22414 EVB may operate in either bus powered or self-powered modes. The power mode must be selected by

jumper J8. If self-powered, the device uses the 5V supplied by the external 5V DC input to J8 power jack. When bus pow-

ered, the XR22414 may not be capable of providing sufficient power to all downstream ports. By USB specification, in bus

powered mode, each downstream port may draw 100 mA maximum and the hub itself may draw an additional 100 mA. In

self-powered mode, external 5V must be supplied to the PCB via the J7 power connector and each downstream port may

draw up to 500 mA.

The XR22414 EVB may alternately operate from a 3.3V input. To power the device from 3.3V the REG_EN# pin must be

deasserted and the VCC5 pin must not be connected to a 5V source. The 3.3V power input to should be provided to all

VCC33 pins and the 3V3_OUT pin will not provide an output voltage.

The XR22414 EVB can be configured for either individual or global power monitoring and ganged power control. In individ-

ual mode, each port is monitored by an XRP2527 power monitor circuit. In global mode, all four downstream ports power is

combined and monitored by a single monitor circuit. Alternately, power to the downstream ports of the XR22414 EVB can

be monitored by a resettable PTC fuse, or by both the fuse and the power monitor devices. Over-current conditions detected

by either XRP2527 current monitors or PTC fuses are signaled to the OVC# pin of the device, and power out pins (PWR#)

are deasserted to then power down downstream ports.

Table 2 defines the jumper settings on the XR22414 EVB, and the default settings of each jumper when shipped from the

factory.

Table 2: Jumper Settings and components for PCB Power

Jumper Description Default

J8 J8 must be installed either pin 1 to 2 when the XR22414 is self-powered

or pin 2 to 3 when the device is bus powered.

By default J8 is installed pin 1 to 2

J6 J6 can be used to bypass the inrush current limiting circuit when the

XR22414 is bus powered.

By default J6 is not installed

J1, J2, J3, J4, J5 To power the device from 3.3V instead of 5V, the top surface trace

across jumper J3 must be cut disabling the 5V to 3.3V internal regulator.

For the XR22414CV48EVB the top surface trace across jumper J2 must

also be cut and J1 must be installed from pin 2 to 3 to use the external

3.3V LDO voltage. For the XR22414CL48EVB J5 trace must be cut and

J4 must be installed pin 2 to 3.

J2, J3 and J5 are normally not installed.

By Default, J1 in installed pin 1 to 2 for

the XR22414CV48EVB or J4 is installed

pin 1 to 2 for the XR22414CL48EVB.

J21, J22, J23, J24,

J25, J26, J27

J21 is used to select global over current monitoring for downstream port

over-current protection. When J21 is installed, global over-current moni-

toring is selected. When J21 is not installed, individual port over-current

monitoring is selected. If J21 is installed, J25, J26 and J27 should also

be installed to connect port power for all downstream ports together and

J22, J23, and J24 should also be installed to connect unused OVCn#

pins to ground.

By default J21, J22, J23, J24, J25, J26

and J27 are not installed.

J9, J10, J15, J16 J9, J10, J15 and J16 are used to select whether the PTC fuse only or

current monitor (XRP2527) device is used for downstream port over-cur-

rent protection.

By default J9, J10, J15 and J16 are

installed from pin 1 to 2.

J11, J12, J17, J18 If J9, J10, J15 and J16 are installed pin 1 to 2, J11, J12, J17 and J18

select whether XRP2527 over-current monitor only or PTC fuse and cur-

rent monitor devices protect downstream ports.

By default J11, J12, J17 and J18 are

installed from pin 2 to 3.

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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

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XR22414 Evaluation Board Bill of Materials

The Bill of Materials for the two versions of the XR22414 evaluation boards are in the following tables. The

XR22414CV48EVB BOM is in Table 4 and XR22414CL48EVB in Table 5. Several component part numbers marked “DNI”

may typically be not installed on the Exar evaluation boards. However, these may be used on customer PCBs for EMI or

other purposes as desired.

Table 4: XR22414CV48EVB BOM (Rev. 1.1 PCB)

Item Qty Ref. Des Description Part Number

1 5 CM1, CM2, CM3, CM4, CM5 Common Mode Choke Surface Mount 744230900_DNI

2 4 CON2, CON3, CON4, CON5 USB Conn, Receptable, A-type 61400416021

3 1 CON1 Connector, USB_MICRO_ B 629105150521

4 8 C1, C2, C4, C6, C10, C12, C18, C20 Ceramic Capacitor, 47uF/16V 1210 885012109011

5 2 C26, C27 Ceramic Capacitor, 4.7uF/16V 0805 885012107013

6 2 C28, C40 Ceramic Capacitor, 10uF/16V 0805 885012107014

7 10 C7, C8, C9, C11, C15, C16, C17, C19, C49, C50 Ceramic Capacitor, 1uF/16V, 0805 885012207051

8 16 C3, C5, C23, C25, C31, C35, C36, C37, C38, C42,

C43, C44, C45, C48, C51, C52

Ceramic Capacitor, 100nF/25V 0603 885012206071

9 4 D2, D3, D4, D5 LED, Green, 0805 150080GS75000

10 1 D5 LED, Blue, 0805 150080BS75000

11 4 D6, D7, D8, D9 LED, Amber, 0805 150080YS75000

12 1 F1 PTC Resettable, 0.75A 8V 1812 MF-MSMF075-2

13 3 F2, F3, F4 PTC Resettable, 0.75A 8V 1812 DNI MF-MSMF075-2_DNI

14 14 J1, J8, J9, J10, J11, J12, J13, J14, J15, J16, J17,

J18, J19, J20

3 Positions Header, 0.100" (2.54mm) 61300311121

15 1 J4 3 Positions Header, 0.100" (2.54mm) DNI 61300311121_DNI

16 7 J21, J22, J23, J24, J25, J26, J27 2 Positions Header, 0.100" (2.54mm) 61300211121

17 4 J2, J3, J5, J6 2 Positions Header, 0.100" (2.54mm) 61300211121_DNI

18 1 J7 Connector, Power Jack, DC RA SMD 694103107102

19 1 Q1 MOSFET P-CH 12V 4.1A SOT-23 SI2333DS-T1-E3

20 1 R5 Resistor, 2.7 kOhm, 1%, 0603

21 1 R8 Resistor, 0 Ohm, 0603

22 11 R9, R10, R11, R12, R13, R14, R15, R16, R17, R18,

R19

Resistor, 0 Ohm, 0603 DNI DNI

23 4 R29, R30, R35, R36 Resistor, 215 kOhm, 5%, 0603

24 10 R2, R3, R6, R7, R21, R24, R25, R26, R31, R32 Resistor, 10 kOhm, 5%, 0603

24 1 R23 Resistor, 100 kOhm, 5%, 0603

25 1 R28, R28,R33, R34 Resistor, 100 kOhm, 5%, 0603 DNI

26 2 R1,R22 Resistor, 5.1 kOhm, 5%, 0603

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27 1 R44 Resistor, 470 Ohm, 5%, 0603

28 4 R43, R45, R46, R47 Resistor, 2 kOhm, 5%, 0603

29 1 R20 Resistor, 40.2 KOhm, 1%, 0603

30 1 SW1 Switch, SPST-NO 431481031816

31 5 TP1, TP2, TP3, TP4, TP5 Test Point PC Mini .040"D Yellow 36-5004-ND

32 1 U1 IC, USB 2.0 Hub, 4 Port, LQFP48 XR22414CV48-F

33 4 U4, U5, U6, U7 USB Current Monitor, DFN8 2x3 XRP2527IHB-1-F

34 1 U8 LDO 5V to 3.3V SP6260GEK-L/TR_DNI

35 1 U3 Hex Inverter IC SN74LVC14ADRG3

36 1 Y2 12MHz ±20ppm Crystal 18pF -20°C ~ 70°C

4-SMD

ABMM-12.000MHZ-B2-T

Table 5: XR22414CL48EVB BOM (Rev. 1.1 PCB)

Item Qty Ref. Des Description Part Number

1 5 CM1, CM2, CM3, CM4, CM5 Common Mode Choke Surface Mount 744230900_DNI

2 4 CON2, CON3, CON4, CON5 USB Conn, Receptable, A-type 61400416021

3 1 CON1 Connector, USB_MICRO_ B 629105150521

4 8 C1, C2, C4, C6, C10, C12, C18, C20 Ceramic Capacitor, 47uF/16V 1210 885012109011

5 2 C26, C27 Ceramic Capacitor, 4.7uF/16V 0805 885012107013

6 2 C28, C40 Ceramic Capacitor, 10uF/16V 0805 885012107014

7 10 C7, C8, C9, C11, C15, C16, C17, C19, C49, C50 Ceramic Capacitor, 1uF/16V, 0805 885012207051

8 15 C3, C5, C24, C25, C30, C32, C33, C34, C39, C42,

C46, C47, C48, C51, C52

Ceramic Capacitor, 100nF/25V 0603 885012206071

9 4 D2, D3, D4, D5 LED, Green, 0805 150080GS75000

10 1 D5 LED, Blue, 0805 150080BS75000

11 4 D6, D7, D8, D9 LED, Amber, 0805 150080YS75000

12 1 F1 PTC Resettable, 0.75A 8V 1812 MF-MSMF075-2

13 3 F2, F3, F4 PTC Resettable, 0.75A 8V 1812 DNI MF-MSMF075-2_DNI

14 14 J4, J8, J9, J10, J11, J12, J13, J14, J15, J16, J17,

J18, J19, J20

3 Positions Header, 0.100" (2.54mm) 61300311121

15 1 J1 3 Positions Header, 0.100" (2.54mm) DNI 61300311121_DNI

16 7 J21, J22, J23, J24, J25, J26, J27 2 Positions Header, 0.100" (2.54mm) 61300211121

17 4 J2, J3, J5, J6 2 Positions Header, 0.100" (2.54mm) 61300211121_DNI

18 1 J7 Connector, Power Jack, DC RA SMD 694103107102

Table 4: XR22414CV48EVB BOM (Rev. 1.1 PCB)

Item Qty Ref. Des Description Part Number

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Note: Part numbers marked _DNI are not installed.

19 1 Q1 MOSFET P-CH 12V 4.1A SOT-23 SI2333DS-T1-E3

20 1 R4 Resistor, 2.7 kOhm, 1%, 0603

21 12 R8, R10, R11, R12, R13, R14, R15, R16, R17, R18,

R19

Resistor, 0 Ohm, 0603

22 1 R9 Resistor, 0 Ohm, 0603 DNI DNI

23 4 R29, R30, R35, R36 Resistor, 215 kOhm, 5%, 0603

24 10 R2, R3, R6, R7, R21, R24, R25, R26, R31, R32 Resistor, 10 kOhm, 5%, 0603

24 1 R23 Resistor, 100 kOhm, 5%, 0603

25 1 R28, R28,R33, R34 Resistor, 100 kOhm, 5%, 0603 DNI

26 2 R1,R22 Resistor, 5.1 kOhm, 5%, 0603

27 1 R44 Resistor, 470 Ohm, 5%, 0603

28 4 R43, R45, R46, R47 Resistor, 2 kOhm, 5%, 0603

29 1 R20 Resistor, 40.2 KOhm, 1%, 0603

30 1 SW1 Switch, SPST-NO 431481031816

31 5 TP1, TP2, TP3, TP4, TP5 Test Point PC Mini .040"D Yellow 36-5004-ND

32 1 U2 IC, USB 2.0 Hub, 4 Port, QFN48 XR22414CL48-F

33 4 U4, U5, U6, U7 USB Current Monitor, DFN8 2x3 XRP2527IHB-1-F

34 1 U8 LDO 5V to 3.3V SP6260GEK-L/TR_DNI

35 1 U3 Hex Inverter IC SN74LVC14ADRG3

36 1 Y1 12MHz ±20ppm Crystal 18pF -20°C ~ 70°C

4-SMD

ABMM-12.000MHZ-B2-T

Table 5: XR22414CL48EVB BOM (Rev. 1.1 PCB)

Item Qty Ref. Des Description Part Number

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For Further Assistance:

Email: UARTtechsupport@exar.com

Exar Technical Documentation: http://www.exar.com/techdoc/

Exar Corporation Headquarters and Sales Offices

48720 Kato Road Tel: +1 (510) 668-7000

Fremont, CA 95438 - USA Fax: +1 (510) 668-7001

NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation

assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free

of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user’s specific application. While the information

in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.

EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to

cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation

receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Cor-

poration is adequately protected under the circumstances.