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1/14 features usb 2.0 compliant interface compatible with battery charging specification revision 1.1/1.2 led indicators for port, hub or charging activity ganged port power enable global overcurrent sensing single 5v or 3.3v power supply single 12mhz crystal applications usb port expansion docking stations pos terminals factory automation and process controls industrial applications description 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. 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. the xr22404 provides ganged power control and global overcurrent sensing for the downstream ports. 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 i 2 c eeprom may be used with the xr22404 to configure usb device descriptors. typical application figure 1. typical application xr22404 usb host upstream phy hub controller tt port routing downstream phy x4 device #1 device #2 device #3 device #4 usb 2.0 4-port hub xr 22404 rev1a
2/14 absolute maximum ratings 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. vcc5 supply voltage ......................................... -0.5v to 6v vcc33 supply voltage ....................................... -0.5v to 4v input voltage (all pins except usbd+, usbdC) ................... -0.3v to 4.0v input voltage (usbd+ and usbdC) ............. -0.3v to 5.75v junction temperature ................................................. 125c operating conditions operating temperature range ........................... 0c to 70c vcc5 supply voltage ........................................ 4.4v to 5.5v vcc33 supply voltage ...................................... 3.0v to 3.6v xr 22404 rev1a
3/14 electrical characteristics unless otherwise noted: t a = 0c to 70c, v cc = 4.4v to 5.5v. symbol conditions min typ max units upstream port speed number of active downstream ports downstream ports device speed power consumption dc supply current (v cc = vcc5) i cc high speed suspend 1.2 2.5 ma none 44 ma 1 1x full speed 55 ma 1x high speed 56 ma 2 2x full speed 59 ma 1x full speed, 1x high speed 68 ma 2x high speed 74 ma 4 4x full speed 70 ma 4x high speed 100 ma full speed suspend 1.2 2.5 ma none 30 ma 1 1x full speed 35 ma 4 4x full speed 55 ma symbol conditions min typ max units upstream port speed number of active downstream ports downstream ports device speed power consumption dc supply current (v cc = vcc33) i cc high speed suspend 1.1 2.5 ma none 42 ma 1 1x full speed 50 ma 1x high speed 54 ma 2 2x full speed 58 ma 1x full speed, 1x high speed 61 ma 2x high speed 72 ma 4 4x full speed 68 ma 4x high speed 97 ma full speed suspend 1.1 2.5 ma none 29 ma 1 1x full speed 34 ma 4 4x full speed 53 ma xr 22404 rev1a
4/14 gnd 7 8 9 10 11 12 dm3 dp3 dm2 dp2 dm1 dp1 1 2 3 4 5 6 ovc# test/sda xtalout xtalin dm4 dp4 pwr# led2 led1/scl led_ctl/chrgen vcc33 vcc5 24 23 22 21 20 19 bus_pwr# vbus_sense ext_rst# up_dp up_dm rext 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 gnd xtalout xtalin dm4 dp4 dm3 dp3 dm2 dp2 dm1 dp1 test2 test3 rext 28 27 26 25 24 23 22 21 20 19 18 17 16 15 test4 test#/sda ovc# pwr# led2 led1/scl led_ctl/chrgen vcc33 vcc5 bus_pwr# vbus_sense ext_rst# up_dp up_dm 24-pin qfn note: center pad must be connected to digital ground on pcb. 28-pin ssop electrical characteristics (continued) unless otherwise noted: t a = 0c to 70c, v cc = 4.4v to 5.5v. symbol parameter conditions min typ max units non-usb i/o pins v il input low voltage -0.3 0.8 v v ih input high voltage 2.0 5.5 v v ol output low voltage i ol = 4 ma 0.4 v v oh output high voltage i ol = -4 ma 2.4 v i il input low leakage current 10 a i ih input high leakage current 10 a c in input pin capacitance 5 pf 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 xr 22404 rev1a
5/14 pin functions qfn-24 pin number ssop-28 pin number pin name type description center pad 1 gnd pwr digital ground (in qfn package center pad must be connected to digital ground). 3 2 xtalout o 12 mhz crystal feedback output. 4 3 xtalin i 12 mhz 50 ppm crystal input with load capacitance rating of 16-20 pf. 5 4 dm4 i/o downstream port 4 usb d- data. 6 5 dp4 i/o downstream port 4 usb d+ data. 7 6 dm3 i/o downstream port 3 usb d- data. 8 7 dp3 i/o downstream port 3 usb d+ data. 9 8 dm2 i/o downstream port 2 usb d- data. 10 9 dp2 i/o downstream port 2 usb d+ data. 11 10 dm1 i/o downstream port 1 usb d- data. 12 11 dp1 i/o downstream port 1 usb d+ data. - 12 test2 - leave unconnected for normal operation. - 13 test3 - leave unconnected for normal operation. 13 14 rext i external bias resistor. connect 2.7k 1% resistor from this pin to gnd. 14 15 up_dm i/o upstream port usb d- data. 15 16 up_dp i/o upstream port usb d+ data. 16 17 ext_rst# i external reset input, active low. must be asserted for a minimum of 10 s. 17 18 vbus_sense i active high. indicates connection to usb host. connect to vbus power input from usb host through series 10k? registor. a 100k? pull-down registor and 100nf shunt capacitance are required on this pin. 18 19 bus_pwr# i bus power indicator, active low. for bus powered mode, connect to ground. for self- powered mode, connect to logic 1. 19 20 vcc5 pwr 5v power to internal 5v to 3.3v regulator, unused when device is powered by 3.3v. 20 21 vcc33 pwr 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 f. 21 22 led_ctl/ chrgen i/o 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 . 22 23 led1/scl i/o port 1 led indicator or i 2 c clock for external eeprom. max source current 3 ma. may be used in conjunction with led_ctl/chrgen pin. 23 24 led2 i/o port 2 led indicator. max source current 3 ma. may be used in conjunction with drv pin. refer to figure 3. 24 25 pwr# o 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. 1 26 ovc# i downstream port global overcurrent indicator, active low. 2 27 test#/sda i test mode enable, active low or i 2 c serial data for external eeprom. tie to logic 1 for normal device operation or connect to serial data of i 2 c eeprom. - 28 test4 - leave unconnected for normal operation. note: type: i = input, o = output, i/o = input/output, pwr = power, od = open-drain. xr 22404 rev1a
6/14 figure 2. functional block diagram xr22404 usb host downstream phy #1 device #1 device #2 device #3 device #4 downstream phy #2 downstream phy #3 downstream phy #4 tt port routing switch downstream port controller upstream phy upstream port controller hub controller overcurrent detection power control 3.3v to 1.8v regulator hub activity indicator led controller oscillator pll (x40) port indicators 12 mhz 480 mhz 5v to 3.3v regulator functional block diagram xr 22404 rev1a
7/14 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 exars usb vendor id is 0x04e2. usb product id exars 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. xr 22404 rev1a
8/14 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 vbus_sense bus_pwr# capability logic 1 logic 1 logic 1 cdp - connected to upstream usb host, downstream ports may be used in normal hub operation or for charging. logic 1 logic 0 logic 1 dcp - not connected to upstream usb host, all downstream ports may be used for charging. x logic 1 logic 0 sdp - bus power is not capable of providing enough power for battery charging capability, downstream ports used in normal hub operation. logic 0 logic 1 x 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. xr 22404 rev1a
9/14 applications information (continued) external eeprom an external i 2 c 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 0x40 eeprom check value. 0x01 0x1a eeprom check value. 0x02 vendor id, lsb idvendor field lsb of device descriptor. 0x03 vendor id, msb idvendor field msb of device descriptor. 0x04 product id, lsb idproduct field lsb of device descriptor. 0x05 product id, msb idproduct field msb of device descriptor. 0x06 device release, lsb bcddevice field lsb of device descriptor in binary coded decimal format. 0x07 device release, msb bcddevice field msb of device descriptor in binary coded decimal format. 0x08 to 0x19 reserved must be 0x00. 0x1a downstream ports number of downstream ports in the bnbrports field of the hub descriptor. 0x1b to 0x1e reserved must be 0x00. 0x1f checksum bitwise checksum of eeprom values from address 0x00 to 0x1e. xr 22404 rev1a
10/14 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. led1/scl led_ctl/chrgen xr22404 green port 1 activity green port 3 activity led2 green port 2 activity green port 4 activity hub active indicator (optional) figure 3. port and hub activity indicators xr 22404 rev1a
11/14 applications information (continued) led1/scl led_ctl/chrgen xr22404 led2 hub active indicator 3.3v 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 xr 22404 rev1a
12/14 1. is t o ler an ce o f e x p o s ed p ad and 0. 1m m 2. di m ens io n s and t o ler an ce per j ede c m o - 220 d r a w ing n o . : p od - 00000091 r e v is ion : a s ide view t o p view t y p i ca l recomme nde d lan d pa tte rn t erm in a l di m e nsion bo tto m vi e w package description qfn-24 xr 22404 rev1a
13/14 1. di m en s io n s and t o ler an ce per j ede c m o - 150 d r a w ing n o . : p od - 00000090 r e v is ion : a side vie w t o p view t yp i ca l r eco mmende d lan d pat t ern termi na l di m e nsion fro nt vi e w package description (continued) ssop-28 xr 22404 rev1a
www.exar.com 14/14 tel.: +1 (510) 668-7000 fax: +1 (510) 668-7001 email: uarttechsupport@exar.com ordering information (1) part number operating temperature range lead-free package packaging method xr22404cl24-f 0c to 70c yes (2) 24-pin qfn tray xr22404cl24tr-f reel XR22404CG28-F 28-pin ssop tray xr22404cg28tr-f reel xr22404cl24evb evaluation board for qfn-24 xr22404cg28evb 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 date description 1a aug 2016 initial release xr 22404 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 rev1a 48760 kato road fremont, ca 94538 usa

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