XR22404CL24-F [EXAR]
USB 2.0 4-Port Hub;
| 型号： | XR22404CL24-F |
| 厂家： | 
EXAR CORPORATION |
| 描述： | USB 2.0 4-Port Hub 外围集成电路 |
| 文件： | 总14页 (文件大小：465K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XR22404
USB 2.0 4-Port Hub
Description
FEATURES
The XR22404 is a USB 2.0 4-port hub with a Single Transaction
Translator (STT). It may be configured for downstream device charging
and is compatible with Battery Charging specification revision 1.1/1.2.
ꢀ■
USB 2.0 compliant interface
ꢀ■
Compatible with Battery Charging
specification revision 1.1/1.2
LED indicators for port, hub or charging
activity
ꢀ■
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) and downstream PHY supporting hi-speed, full-
speed and low-speed (1.5Mbps) on each of the 4 downstream ports.
ꢀ■
ꢀ■
ꢀ■
ꢀ■
Ganged port power enable
Global overcurrent sensing
Single 5V or 3.3V power supply
Single 12MHz Crystal
The XR22404 provides ganged power control and global overcurrent
sensing for the downstream ports.
APPLICATIONS
ꢀ■
USB port expansion
Docking stations
POS terminals
Factory automation and process controls
The XR22404 may be operated from either 5V or 3.3V. If powered
from 5V internal regulators provide 3.3V and 1.8V used internally by
the device. Port activity and overall hub activity indicators provide
status outputs for external LEDs. An external I2C EEPROM may be
used with the XR22404 to configure USB device descriptors.
ꢀ■
ꢀ■
ꢀ■
ꢀ■
Industrial applications
Typical Application
USB Host
Upstream Phy
XR22404
Hub Controller
TT
Port Routing
Downstream Phy x4
Device #1
Device #2
Device #3
Device #4
Figure 1. Typical Application
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XR22404
Absolute Maximum Ratings
Operating Conditions
Stresses beyond the limits listed below may cause
permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect
device reliability and lifetime.
Operating temperature range ........................... 0°C to 70°C
VCC5 supply voltage........................................4.4V to 5.5V
VCC33 supply voltage......................................3.0V to 3.6V
VCC5 supply voltage......................................... -0.5V to 6V
VCC33 supply voltage....................................... -0.5V to 4V
Input voltage
(all pins except USBD+, USBD–) ................... -0.3V to 4.0V
Input voltage (USBD+ and USBD–) ............. -0.3V to 5.75V
Junction temperature................................................. 125°C
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XR22404
Electrical Characteristics
Unless otherwise noted: T = 0°C to 70°C, V = 4.4V to 5.5V.
A
CC
Conditions
Symbol
Min
Typ
Max
2.5
Units
Upstream
Port Speed
Number of Active
Downstream Ports
Downstream Ports
Device Speed
Power Consumption DC Supply Current (VCC = VCC5)
Suspend
None
1.2
44
55
56
59
68
74
70
100
1.2
30
35
55
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
1x Full Speed
1x High Speed
1
High Speed
2x Full Speed
2
1x Full Speed, 1x High Speed
2x High Speed
I
CC
4x Full Speed
4
4x High Speed
Suspend
2.5
None
Full Speed
1
4
1x Full Speed
4x Full Speed
Conditions
Symbol
Min
Typ
Max
2.5
Units
Upstream
Port Speed
Number of Active
Downstream Ports
Downstream Ports
Device Speed
Power Consumption DC Supply Current (VCC = VCC33)
Suspend
None
1.1
42
50
54
58
61
72
68
97
1.1
29
34
53
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
1x Full Speed
1x High Speed
1
High Speed
2x Full Speed
2
1x Full Speed, 1x High Speed
2x High Speed
I
CC
4x Full Speed
4
4x High Speed
Suspend
2.5
None
Full Speed
1
4
1x Full Speed
4x Full Speed
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XR22404
Electrical Characteristics (Continued)
Unless otherwise noted: T = 0°C to 70°C, V = 4.4V to 5.5V.
A
CC
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Non-USB I/O Pins
V
V
V
V
Input low voltage
-0.3
2.0
0.8
5.5
0.4
V
V
IL
Input high voltage
IH
Output low voltage
I
I
= 4 mA
V
OL
OH
OL
OL
Output high voltage
Input low leakage current
Input high leakage current
Input pin capacitance
= -4 mA
2.4
V
I
I
10
10
5
μA
μA
pF
IL
IH
C
IN
USB I/O Pins(1)
3.3V Regulated Power Output
3V3_OUT
Output voltage
Max load current 100 mA
3.0
3.3
3.6
V
NOTE:
1. See USB 2.0 Specification for USB I/O pins DC Electrical Characteristics.
Pin Configuration, Top View
GND
XTALOUT
XTALIN
DM4
1
2
3
4
5
6
7
8
9
28 TEST4
27 TEST#/SDA
26 OVC#
25 PWR#
DP4
24 LED2
OVC#
TEST/SDA
XTALOUT
XTALIN
DM4
1
2
3
4
5
6
18 BUS_PWR#
17 VBUS_SENSE
16 EXT_RST#
15 UP_DP
DM3
23 LED1/SCL
DP3
22 LED_CTL/CHRGEN
21 VCC33
GND
DM2
DP2
20 VCC5
14 UP_DM
DM1 10
DP1 11
19 BUS_PWR#
18 VBUS_SENSE
17 EXT_RST#
16 UP_DP
DP4
13 REXT
TEST2 12
TEST3 13
REXT 14
15 UP_DM
24-Pin QFN
NOTE:
Center Pad must be connected to digital ground on PCB.
28-Pin SSOP
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XR22404
Pin Functions
QFN-24
Pin Number Pin Number
SSOP-28
Pin Name
Type Description
Center Pad
1
2
GND
XTALOUT
XTALIN
DM4
PWR Digital ground (in QFN package Center Pad must be connected to digital ground).
3
4
O
I
12 MHz crystal feedback output.
3
12 MHz 50 ppm crystal input with load capacitance rating of 16-20 pF.
Downstream port 4 USB D- data.
5
4
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
6
5
DP4
Downstream port 4 USB D+ data.
7
6
DM3
Downstream port 3 USB D- data.
8
7
DP3
Downstream port 3 USB D+ data.
9
8
DM2
Downstream port 2 USB D- data.
10
11
12
-
9
DP2
Downstream port 2 USB D+ data.
10
11
12
13
14
15
16
17
DM1
Downstream port 1 USB D- data.
DP1
Downstream port 1 USB D+ data.
TEST2
TEST3
REXT
UP_DM
UP_DP
EXT_RST#
Leave unconnected for normal operation.
Leave unconnected for normal operation.
External bias resistor. Connect 2.7kΩ 1% resistor from this pin to GND.
Upstream port USB D- data.
-
-
13
14
15
16
I
I/O
I/O
I
Upstream port USB D+ data.
External reset input, active low. Must be asserted for a minimum of 10 µS.
Active high. Indicates connection to USB host. Connect to VBUS power input from
USB host through series 10kΩ registor. A 100kΩ pull-down registor and 100nF shunt
capacitance are required on this pin.
17
18
VBUS_SENSE
I
I
Bus power indicator, active low. For bus powered mode, connect to ground. For self-
powered mode, connect to logic ‘1’.
18
19
20
19
20
21
BUS_PWR#
VCC5
PWR 5V power to internal 5V to 3.3V regulator, unused when device is powered by 3.3V.
3.3V power input, when device is powered by 3.3V. If device is powered by 5V to VCC5
pin, decouple this pin with 4.7 µF.
VCC33
PWR
LED hub active indicator or downstream port charge enable, active high. May also be
used in conjunction with port status LEDs. If sampled high during power up reset,
all downstream ports may be used as charging ports. Refer to Table 1.
LED_CTL/
CHRGEN
21
22
I/O
Port 1 LED indicator or I2C clock for external EEPROM. Max source current 3 mA. May be
used in conjunction with LED_CTL/CHRGEN pin.
22
23
23
24
LED1/SCL
LED2
I/O
I/O
Port 2 LED indicator. Max source current 3 mA. May be used in conjunction with DRV pin.
Refer to Figure 3.
Power enable for all downstream devices. Asserted when XR22404 device is configured
and OVC# is not asserted. Deasserted (high) if OVC# input is asserted or XR22404 is
not configured.
24
25
PWR#
O
1
2
-
26
27
28
OVC#
TEST#/SDA
TEST4
I
I
-
Downstream port global overcurrent indicator, active low.
Test mode enable, active low or I2C serial data for external EEPROM. Tie to logic ‘1’ for
normal device operation or connect to serial data of I2C EEPROM.
Leave unconnected for normal operation.
NOTE:
Type: I = Input, O = Output, I/O = Input/Output, PWR = Power, OD = Open-Drain.
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XR22404
Functional Block Diagram
USB Host
XR22404
Upstream Phy
Upstream Port Controller
Hub
Activity
Indicator
Port
Indicators
LED
Controller
Hub
Controller
12
MHz
5V to 3.3V
Regulator
3.3V to 1.8V
Regulator
Oscillator
PLL (x40)
480
MHz
Power
Control
Overcurrent
Detection
Downstream Port Controller
Port Routing Switch
TT
Downstream
Phy #2
Downstream
Phy #4
Downstream
Phy #1
Downstream
Phy #3
Device #1
Device #2
Device #3
Device #4
Figure 2. Functional Block Diagram
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XR22404
Applications Information
Functional Description
The XR22404 hub has a single transaction translator that allows the USB 2.0 hub to take incoming high speed packets from
the USB host on the upstream port and translate these commands if necessary, to full or low speed commands on any of
the 4 downstream ports. Additionally, the XR22404 can provide battery charging on all four downstream ports compatible
with the USB Battery Charging Specification revision 1.1/1.2.
USB Interface
The hub function of the XR22404 supports one configuration and utilizes the following USB endpoints:
ꢀ■
Control endpoint
ꢀ■
Status change endpoint
The XR22404 hub may be configured for bus powered mode with a maximum power of 500 mA or self-powered mode by
connecting the BUS_PWR# pin to the appropriate logic state. In bus powered mode, downstream ports are limited to low
power (100 mA or less). When self-powered, downstream devices can draw up to 500 mA on each of the four ports.
USB Vendor ID
Exar’s USB vendor ID is 0x04E2.
USB Product ID
Exar’s USB hub product ID is 0x0404.
Device Reset
The XR22404 has both an automatic power-up reset and an external hardware pin reset. Normal hub operation or charging
mode is sampled on the LED_CTL/CHRGEN pin at device reset. Refer to Table 1 for further description of charging modes.
USB Suspend
All USB peripheral devices must support the USB suspend mode. Per USB standard, the XR22404 device will begin to
enter the suspend state if it does not detect any activity, (including Start of Frame or SOF packets) on its USB data lines for
3 ms. In bus powered mode the peripheral device must then reduce power consumption from VBUS power within the next
7 ms to the allowed limit of 2.5 mA for the suspended state. Note that in this context, the “device” is all circuitry (including
the XR22404) that draws power from the host VBUS. Each attached downstream port is also allowed an additional 2.5 mA
of suspend current. If no devices are connected to the XR22404 downstream ports, the USB host will suspend the hub.
Ganged Power Control and Global Overcurrent Sensing
The OVC# pin is used as a global overcurrent protection input for current sensing. The PWR# pin will be asserted whenever
the OVC# input pin is asserted or the XR22404 device is not yet configured.
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XR22404
Applications Information (Continued)
Battery Charging
The XR22404 will provide downstream charging irrespective of its state, i.e., enumerated, detached, operational, or
suspended as long as it is powered by an external source, i.e., self-powered. In bus powered mode, VBUS power is not
capable of providing sufficient power for the XR22404 to charge downstream devices.
If the XR22404 device is self-powered and LED_CTL/CHRGEN pin is tied to a logic ‘1’ during power up or external reset, the
XR22404 battery charging function will be enabled on all downstream ports. If the device is self-powered and connected to
an upstream USB host, the XR22404 will function as a Charging Downstream Port (CDP). If the device is self-powered but
not connected to a USB host, the XR22404 will function as a Dedicated Charging Port (DCP). Refer to Table 1.
Table 1. Downstream Port Capability
CHRGEN
Logic ‘1’
VBUS_SENSE
Logic ‘1’
BUS_PWR#
Logic ‘1’
Capability
CDP - Connected to upstream USB host, downstream ports may be used in
normal hub operation or for charging.
DCP - Not connected to upstream USB host, all downstream ports may be
used for charging.
Logic ‘1’
Logic ‘0’
Logic ‘1’
SDP - Bus power is not capable of providing enough power for battery
charging capability, downstream ports used in normal hub operation.
“X”
Logic ‘1’
Logic ‘1’
Logic ‘0’
“X”
Logic ‘0’
SDP - Normal hub operation.
USB Hub Drivers
All Operating Systems provide a native USB hub device driver required for the XR22404 device to operate. No other device
drivers are necessary for the XR22404.
Regulated 3.3V Power Output
The XR22404 internal voltage regulator provides 3.3 VDC output power from 5V input, which can be utilized by
other circuitry. Refer to Electrical Characteristics on page 2 for maximum power capability.
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XR22404
Applications Information (Continued)
External EEPROM
An external I2C EEPROM may be used with the XR22404 to configure USB device descriptors and the number of
downstream ports. The contents of the EEPROM are described in Table 2. In order for contents of the EEPROM to be
used by the XR22404, both the EEPROM check values at address 0x00, 0x01 and the checksum at address 0x1F must be
correct. If either field is incorrect or reserved fields are not set to 0x00, the EEPROM contents will be ignored and the device
will use the default descriptor values.
Table 2. EEPROM Contents
Address
Content
Description
0x00
0x01
0x40
0x1A
EEPROM check value.
EEPROM check value.
0x02
Vendor ID, LSB
Vendor ID, MSB
Product ID, LSB
Product ID, MSB
Device Release, LSB
Device Release, MSB
Reserved
idVendor field LSB of device descriptor.
idVendor field MSB of device descriptor.
idProduct field LSB of device descriptor.
idProduct field MSB of device descriptor.
bcdDevice field LSB of device descriptor in binary coded decimal format.
bcdDevice field MSB of device descriptor in binary coded decimal format.
Must be 0x00.
0x03
0x04
0x05
0x06
0x07
0x08 to 0x19
0x1A
Downstream Ports
Reserved
Number of downstream ports in the bNbrPorts field of the hub descriptor.
Must be 0x00.
0x1B to 0x1E
0x1F
Checksum
Bitwise checksum of EEPROM values from address 0x00 to 0x1E.
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XR22404
Applications Information (Continued)
LED Indicators
LED indicators in the XR22404 may be used for downstream port and hub activity indicators or as a downstream charging
indicator. Figure 3 demonstrates individual and hub activity indicators. Figure 4 demonstrates a joint port activity along with
hub activity indicators.
Green Port
1 Activity
LED1/SCL
Green Port
3 Activity
Green Port
2 Activity
XR22404
LED2
Green Port
4 Activity
LED_CTL/CHRGEN
Hub active
indicator (optional)
Figure 3. Port and Hub Activity Indicators
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XR22404
Applications Information (Continued)
3.3V
LED1/SCL
LED2
XR22404
LED_CTL/CHRGEN
Hub active
indicator
Figure 4. Joint Port and Hub Activity Indicators
External Crystal
A 12 MHz 50 PPM fundamental frequency external crystal must be connected between the XTALIN and XTALOUT pins
of the XR22404 device. The crystal should have a rated load capacitance of 16-20pF. However, note that both the load
capacitors and feedback resistance are internal to the XR22404 device as shown.
Y1
Figure 5. Typical Oscillator Connections
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XR22404
Package Description
QFN-24
BOTTOM VIEW
TOP VIEW
SIDE VIEW
TERMINAL DIMENSION
TYPICAL RECOMMENDED LAND PATTERN
1.
is tolerance of exposed pad and 0.1mm
2. Dimensions and tolerance per Jedec MO-220
Drawing No. : POD - 00000091
Revision: A
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XR22404
Package Description (Continued)
SSOP-28
TOP VIEW
FRONT VIEW
SIDE VIEW
TERMINAL DIMENSION
TYPICAL RECOMMENDED LAND PATTERN
1. Dimensions and tolerance per Jedec MO-150
Drawing No. : POD - 00000090
Revision: A
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XR22404
Ordering Information(1)
Part Number
Operating Temperature Range
Lead-Free
Yes(2)
Package
Packaging Method
XR22404CL24-F
Tray
Reel
Tray
Reel
24-pin QFN
XR22404CL24TR-F
XR22404CG28-F
XR22404CG28TR-F
XR22404CL24EVB
XR22404CG28EVB
0°C to 70°C
28-pin SSOP
Evaluation board for QFN-24
Evaluation board for SSOP-28
NOTE:
1. Refer to www.exar.com/XR22404 for most up-to-date Ordering Information.
2. Visit www.exar.com for additional information on Environmental Rating.
Revision History
Revision
1A
Date
Description
Aug 2016
Initial Release
www.exar.com
48760 Kato Road
Fremont, CA 94538
USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7001
Email: uarttechsupport@exar.com
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 conveys
no license under any patent or other right and makes no representation that the circuits are free of patent infringement. 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 Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of Exar Corporation is prohibited. Exar, XR and the XR logo are registered trademarks of Exar Corporation.
All other trademarks are the property of their respective owners.
©2016 Exar Corporation
XR22404_DS_082616
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