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smsc usb2502 datasheet revision 2.3 (08-27-07) datasheet product features usb2502 2-port usb 2.0 hub controller ? integrated usb 2.0 compatible 2-port hub ? high-speed (480mbits/s), full-speed (12mbits/s) and low-speed (1.5mbits/s) compatible ? full power management with ganged power control ? detects bus-power/self-power source and changes mode automatically ? complete usb specification 2.0 compatibility ? includes usb 2.0 transceivers ? vid/pid/did, and port c onfiguration for hub via: ? single serial i 2 c eeprom ? smbus slave port ? default vid/pid/did, allows functionality when configuration eeprom is absent ? hardware strapping options allow for configuration without an external eeprom or smbus host ? on-board 24mhz crystal driver circuit or 24 mhz external clock driver ? internal pll for 480mhz usb 2.0 sampling ? internal 1.8v linear voltage regulator ? integrated usb termination and pull-up/pull-down resistors ? internal short circuit protection of usb differential signal pins ? basic single-color led support ? 1.8 volt low power core operation ? 3.3 volt i/o with 5v input tolerance ? 36 pin qfn or 48 pin tqfp lead-free rohs compliant package
order numbers: USB2502-AEZG for 36 pin lead-free rohs comp liant qfn package; usb 2502-ht for 48 pin lead- free rohs compliant tqfp package 2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 2 smsc usb2502 datasheet 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2007 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc produc ts are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accurate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and produc t descriptions at any time without notice. contact your local sm sc sales office to obtain the latest specifications before placing your product order. the provision of this inform ation does not convey to the purchaser of the described semicond uctor devices any licenses under any patent rights or other intellectual property rights of smsc or others. all sales are expressly conditional on your agreement to the te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are availab le upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of this document or other smsc literature, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporat ion (?smsc?). product names and company na mes are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including without limitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liable for any direct, incidental, indirect, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages.
2-port usb 2.0 hub controller datasheet smsc usb2502 3 revision 2.3 (08-27-07) datasheet table of contents chapter 1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 oem selectable features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 chapter 2 pin table 2-port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 3 pin configuration 2-port hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 chapter 4 2-port hub block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 chapter 5 functional block des cription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1 2-port hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1.1 hub configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1.2 vbus detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2 eeprom interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.1 i2c eeprom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.2 in-circuit eeprom programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2.3 eeprom data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.3 smbus slave interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.3.1 bus protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.3.2 invalid protocol response behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.3.3 general call address response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.3.4 slave device time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3.5 stretching the sclk signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3.6 smbus timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3.7 bus reset sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3.8 smbus alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3.9 internal smbus memory register set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.4 default configuration option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.5 default strapping options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.6 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.6.1 external hardware r eset_n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.6.2 usb bus reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 chapter 6 xnor test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 chapter 7 dc parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.1 maximum guaranteed ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.2 recommended operating conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 chapter 8 ac specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 8.1 oscillator/clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 8.1.1 smbus interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 8.1.2 i2c eeprom: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 8.1.3 usb 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 chapter 9 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 4 smsc usb2502 datasheet list of tables table 2.1 2-port pin table for 36-qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 2.2 2-port pin table for 48-tqfp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4.1 2-port hub pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 4.2 smbus or eeprom interfac e behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.3 miscellaneous pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.4 power, ground, and no connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 4.5 buffer type descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 5.1 user-defined descriptor data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 5.2 smbus write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 5.3 smbus read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 5.4 smbus slave interface register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 5.5 reset_n timing for default/strap option mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 5.6 reset_n timing for eeprom mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 table 5.7 reset_n timing for smbus mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 7.1 dc electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 table 9.1 48 pin tqfp package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2-port usb 2.0 hub controller datasheet smsc usb2502 5 revision 2.3 (08-27-07) datasheet list of figures figure 3.1 2-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 3.2 2-port 48-pin tqfp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 4.1 2-port block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 5.1 led strapping option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 figure 5.2 reset_n timing for default/strap option mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 figure 5.3 reset_n timing for eeprom mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 figure 5.4 reset_n timing for smbus mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 figure 9.1 36 pin qfn package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 9.2 48 pin tqfp package outline (7x7x1.4 mm body, 2mm footprint) . . . . . . . . . . . . . . . . . . . 44
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 6 smsc usb2502 datasheet chapter 1 general description the smsc 2-port hub is fully compliant with th e usb 2.0 specification and will attach to a usb host as a full-speed hub or as a full-/high-speed hub. the 2-port hub supports low-speed, full-speed, and high-speed (if operating as a high-speed hub) downstream devices on all of the enabled downstream ports. the hub works with an external usb power di stribution switch device to control v bus switching to downstream ports, and to limit current and sense over-current conditions. all required resistors on the usb ports are integrated into the hub. this includes all series termination resistors on d+ and d? pins and all required pull-down and pull-up resistors on d+ and d? pins. the over-current sense inputs for the downstream facing ports have internal pull-up resistors. throughout this document the upstream facing port of the hub will be referred to as the upstream port, and the downstream facing ports wil l be called the downstream ports. 1.1 oem selectable features a default configuration is available in the usb2 502 following a reset. this configuration may be sufficient for some applications. strapping option pins make it possible to modify a limited sub-set of the configuration options. the usb2502 may also be configured by an extern al eeprom or a microcontroller. when using the microcontroller interface, the hub appears as an smbus slave device. if the hub is pin-strapped for external eeprom configurat ion but no external eeprom is present, then a value of ?0? will be written to all configuration data bit fields (the hub w ill attach to the host with all ?0? values). the 2-port hub supports seve ral oem selectable features: ? operation as a self-powered usb hub or as a bus-powered usb hub. ? operation as a dynamic-powered hub (hub opera tes as a bus-powered device if a local power source is not available and switches to self -powered operation when a local power source is available). ? optional oem configuration via i2c eeprom or via the industry standard smbus interface from an external smbus host. ? compound device support (port is permanently har dwired to a downstream usb peripheral device). ? hardware strapping options enable conf iguration of the fo llowing features. non-removable ports port power polarity (active high or active low logic)
2-port usb 2.0 hub controller datasheet smsc usb2502 7 revision 2.3 (08-27-07) datasheet chapter 2 pin table 2-port table 2.1 2-port pin table for 36-qfn upstream usb 2.0 interface (3 pins) usbdp0 usbdn0 vbus_det 2-port usb 2.0 interface (10 pins) usbdp1 usbdn1 usbdp2 usbdn2 gr1/ non_rem0 gr2/ non_rem1 prtpwr_pol rbias prtpwr ocs_n serial port interface (3 pins) sda/smbdata scl/smbclk/ cfg_sel0 cfg_sel1 misc (7 pins) xtal1/clkin xtal2 reset_n self_pwr atest/ reg_en clkin_en test power, ground (13 pins)
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 8 smsc usb2502 datasheet table 2.2 2-port pin table for 48-tqfp upstream usb 2.0 interface (3 pins) usbdp0 usbdn0 vbus_det 2-port usb 2.0 interface (10 pins) usbdp1 usbdn1 usbdp2 usbdn2 gr1/ non_rem0 gr2/ non_rem1 prtpwr_pol rbias prtpwr ocs_n serial port interface (3 pins) sda/smbdata scl/smbclk cfg_sel0 cfg_sel1 misc (7 pins) xtal1/clkin xtal2 reset_n self_pwr atest/ reg_en clkin_en test power, ground and no connect (25 pins)
2-port usb 2.0 hub controller datasheet smsc usb2502 9 revision 2.3 (08-27-07) datasheet chapter 3 pin configuration 2-port hub figure 3.1 2-port 36-pin qfn thermal slug (must be connected to vss) smsc usb2502 (top view qfn-36) indicates pins on the bottom of the device. vdda33 1 usbdp0 2 usbdn0 3 vss 4 usbdn1 5 usbdp1 6 vdda33 7 usbdp2 8 usbdn2 9 18 vdd18 17 vss 16 self_pwr 15 ocs_n 14 prtpwr 13 prtpwr_pol 12 gr2/non_rem1 11 gr1/non_rem0 10 vss vdd33cr 28 vss 29 xtal1/clkin 31 vdda18pll 32 vdda33pll 33 vss 36 rbias 35 atest/reg_en 34 xtal2 30 26 vss 25 vbus_det 24 reset_n 23 test 22 clkin_en 21 cfg_sel1 20 scl/smbclk/cfg_sel0 19 sda/smbdata 27 vdd18
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 10 smsc usb2502 datasheet figure 3.2 2-port 48-pin tqfp 9''&5 966 ;7$/ ;7$/&/.,1 9''$3// 9''$3// 9'' 966 *5121b5(0 *5121b5(0 6(/)b3:5 3573:5b32/ 3573:5 9''$ $7(675(*b(1 5%,$6 966 2&6b1 86%'3 86%'1 966 966 86%'1 86%'3 9''$ 9''$ 86%'3 86%'1 966 1& 1& 9'' 966 966 9%86b'(7 5(6(7 7(67 &/.,1b(1 &)*b6(/ 6&/60%&/.&)*b6(/ 6'$60%'$7$ 1& 1& 1& 1& 9''&5 966 9''$3// 86% 74)3
2-port usb 2.0 hub controller datasheet smsc usb2502 11 revision 2.3 (08-27-07) datasheet chapter 4 2-port hub block diagram figure 4.1 2-port block diagram table 4.1 2-port hub pin descriptions name symbol type function upstream usb 2.0 interface usb bus data usbdn0 usbdp0 io-u these pins connect to the upstream usb bus data signals. detect upstream vbus power vbus_det i/o8 detects state of upstream vbus power. the smsc hub monitors vbus_det to determine when to assert the internal d+ pull-up resistor (signalling a connect event). when designing a detachable hub, this pin must be connected to the vbus power pin of the usb port that is upstream of the hub. (use of a weak pull-down resistor is recommended.) for self-powered applications with a permanently attached host, this pin must be pulled-up to either 3.3v or 5.0v (typically vdd33). 8svwuhdp v bus 3.3v upstream phy upstream usb data repeater controller sie serial interface pll 24 mhz crystal to eeprom or smbus master routing logic sck sd port controller downstream phy #1 oc sense switch driver led driver strapping options downstream phy #2 downstream usb data oc sense switch/led driver/opt?s downstream usb data bus-power 'hwhfw 1.8v transaction translator 1.8v reg
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 12 smsc usb2502 datasheet 2-port usb 2.0 hub interface high-speed usb data usbdn[2:1] usbdp[2:1] io-u these pins connect to the downstream usb peripheral devices attached to the hub?s ports. usb power enable prtpwr o8 enables power to usb peripheral devices (downstream). the active signal level of the prtpwr pin is determined by the power polarity strapping function of the prtpwr_pol pin. port [2:1] green led & port non- removable strapping option. gr[2:1]/ non_rem[1:0] i/o8 green indicator led for ports 2 and 1. will be active low when led support is enabled via eeprom or smbus. if the hub is configured by the internal default configuration, these pins will be sampled at the rising edge of reset_n (see the applicable reset_n timing table in section 5.6.1 ) to determine if ports [2:1] contain permanently attached (non-removable) devices. also, the active state of the led?s will be determined as follows: non_rem[1:0] = ?00?, all ports are removable, gr2 is active high, gr1 is active high. non_rem1:0] = ?01?, port 1 is non-removable, gr2 is active high, gr1 is active low. non_rem[1:0] = ?10?, ports 1 & 2 are non-removable, gr2 is active low, gr1 is active high. non_rem[1:0] = ?11?, ports 1 & 2 are non-removable, gr2 is active low, gr1 is active low. port power polarity strapping. prtpwr_pol i/o8 port power polarity strapping determination for the active signal polarity of the prtpwr pin. while reset_n is asse rted, the logic state of this pin will (though the use of internal combinatorial logic) determine the active state of the prtpwr pin in order to ensure that downstream port power is not inadvertently enabled to inactive ports during a hardware reset. on the rising edge of reset_n (see the applicable reset_n timing table in section 5.6.1 ), the logic value will be latched internally, and will retain the active signal polarity for the prtpwr pin. ?1? = prtpwr pin has an active ?high? polarity ?0? = prtpwr pin has an active ?low? polarity over current sense ocs_n ipu input from external current monitor indicating an over- current condition. {note: contains internal pull-up to 3.3v supply} usb transceiver bias rbias i-r a 12.0k ( +/? 1%) resistor is attached from ground to this pin to set the transceiver?s internal bias settings. table 4.1 2-port hub pin descriptions (continued) name symbol type function
2-port usb 2.0 hub controller datasheet smsc usb2502 13 revision 2.3 (08-27-07) datasheet serial port interface serial data/smb data sda/smbdata iosd12 (serial data)/(smb data) signal. serial clock/smb clock & config select 0 scl/smbclk/ cfg_sel0 iosd12 (serial clock)/(smb clock) signal. this multifunction pin is read on the rising edge of r eset_n (see the applicable reset_n timing table in section 5.6.1 ) and will determine the hub configuration method as described in ta b l e 4 . 2 . configuration programming select cfg_sel1 i this pin is read on the rising edge of reset_n (see the applicable reset_n timing table in section 5.6.1 ) and will determine the hub configuration method as described in ta b l e 4 . 2 . table 4.2 smbus or eeprom interface behavior cfg_sel1 cfg_sel0 smbus or eeprom interface behavior. 00reserved 0 1 configured as an smbus slave for external download of user- defined descriptors. smbus slave address is 0101100 1 0 internal default configuration via strapping options. 1 1 2-wire (i2c) eeproms are supported, table 4.3 miscellaneous pins name symbol type function crystal input/external clock input xtal1/ clkin iclkx 24mhz crystal or external clock input. this pin connects to either one terminal of the crystal or to an external 24mhz clock when a crystal is not used. crystal output xtal2 oclkx 24mhz crystal this is the other terminal of the crystal, or left unconnected when an external clock source is used to drive xtal1/clkin. it must not be used to drive any external circuitry other than the crystal circuit. clock input enable clkin_en i clock in enable: low = xtal1 and xtal2 pins configured for use with external crystal high = xtal1 pin configured as clkin, and must be driven by an external cmos clock. reset input reset_n is this active low signal is used by the system to reset the chip. the minimum active low pulse is 1us. self-power / bus-power detect self_pwr i detects availability of local self-power source. low = self/local power source is not available (i.e., hub gets all power from upstream usb vbus). high = self/local power source is available. test pin test ipd used for testing the chip. user must treat as a no- connect or connect to ground. table 4.1 2-port hub pin descriptions (continued) name symbol type function
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 14 smsc usb2502 datasheet analog test & internal 1.8v voltage regulator enable atest/ reg_en aio this signal is used for testing the analog section of the chip, and to enable or disable the internal 1.8v regulator. this pin must be connected to vdda33 to enable the internal 1.8v regulator, or to vss to disable the internal regulator. when the internal regulator is enabled, the 1.8v power pins must be left unconnected, except for the required bypass capacitors.when the phy is in test mode, the internal regulator is disabled and the atest pin functions as a test pin. table 4.4 power, ground, and no connect name symbol type function vddcore3p3 vdd33cr +3.3v i/o power. if the internal core 1.8v regulator is enabled, then this pin acts as the regulator input vdd1p8 vdd18 +1.8v core power. if the internal regulator is enabled, then vdd18 pin 27 must have a 4.7 f (or greater) 20% (esr <0.1 ) capacitor to vss vddapll3p3 vdda33pll +3.3v filtered analog power for the internal pll if the internal pll 1.8v regulator is enabled, then this pin acts as the regulator input vddapll1p8 vdda18pll +1.8v filtered analog power for internal pll. if the internal regulator is enabled, then this pin must have a 4.7 f (or greater) 20% (esr <0.1 ) capacitor to vss vdda3p3 vdda33 +3.3v filtered analog power. vss vss ground. table 4.5 buffer type descriptions buffer description i input. ipd input, with a weak internal pull-down. ipu input, with a weak internal pull-up. is input with schmitt trigger. i/o8 input/output 8ma o8 output 8ma table 4.3 miscellaneous pins (continued) name symbol type function
2-port usb 2.0 hub controller datasheet smsc usb2502 15 revision 2.3 (08-27-07) datasheet iosd12 open drain?.12ma sink with schmitt trigger, an d must meet i2c-bus specification version 2.1 requirements. iclkx xtal clock input oclkx xtal clock output i-r rbias io-u defined in usb specification. note: meets usb 1.1 requirements when operating as a 1.1-compliant device and meets usb 2.0 requirements when operating as a 2.0-compliant device. aio analog input/output. per phy test requirements. table 4.5 buffer type de scriptions (continued) buffer description
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 16 smsc usb2502 datasheet chapter 5 functional block description 5.1 2-port hub smsc?s usb 2.0 2-port hub is fully specification co mpliant to the universal serial bus specification revision 2.0 april 27,2000 (12/7/2000 and 5/28/2002 errata). please reference chapter 11 (hub specification) for general details re garding hub operation and functionality. for performance reasons, the 2-port hub provides 1 transaction translator (tt) per port (defined as multi-tt configuration), divided into 4 non-periodic buffers per tt. 5.1.1 hub configuration options the smsc hub supports a large number of features and must be configured in order to correctly function when attached to a usb host controller. there are three principal ways to configure the hub: smbus, eeprom, or by internal default settings. in all cases, the conf iguration method will be determined by the cf g_sel1 and cfg_sel0 pi ns immediately after reset_n negation. 5.1.1.1 vendor id is a 16-bit value that uniquely identifies the vendor of the user device (assigned by usb-interface forum). this field is set by the oem using ei ther the smbus or eeprom interface options. when using the internal default option, smsc?s vid (see table 5.1 ) will be reported. 5.1.1.2 product id is a 16-bit value that the vendor can assign that un iquely identifies this particular product (assigned by oem). this field is set by the oem using ei ther the smbus or eeprom interface options. when using the internal default option, smsc?s pid designation of (see ta b l e 5 . 1 ) will be reported. 5.1.1.3 device id is a 16-bit device release number in bcd format (assigned by oem). this field is set by the oem using either the sm bus or eeprom interface optio ns. when using the inter nal default opt ion, smsc?s did designation of (see table 5.1 ) will be reported. 5.1.1.4 self-powered/bus-powered the hub is either self-powered (draws less th an 2ma of upstream bus power) or bus-powered (limited to a 100ma maximum of upstream power prior to being configured by the host controller). when configured as a bus-powered device, the smsc hub consumes less than 100ma of current prior to being configured. after configuration, the bus-powered smsc hub (along with all associated hub circuitry, any embedded devices if part of a compound device, and 100ma per externally available downstream port) must consume no more than 500ma of upstream vbus current. the current consumption is system dependent, and the oem must ensure that the usb 2. 0 specifications are not violated. when configured as a self-powered device, <1ma of upstream vbus current is consumed and all 7 ports are available, with each port being capable of sourcing 500ma of current. this field is set by the oem using either the smbus or eeprom interface options. when using the internal default option, the self_pwr pin deter mines the self-powered or bus-powered status. please see the description under dynamic power for the self/bus power functionality when dynamic power switching is enabled.
2-port usb 2.0 hub controller datasheet smsc usb2502 17 revision 2.3 (08-27-07) datasheet 5.1.1.5 high-speed disable allows an oem to force the hub to configure as a full-speed device only (i.e. high-speed not available). this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.6 eop disable during fs operation only, this permits the hub to send eop if no downstream traffic is detected at eof1. see section 11.3.1 of the usb 2.0 specification for additional details. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.7 current sensing selects current sensing as all ports ganged, or none. this field can be set by the oe m using either the smbus or eepr om interface options.when using the internal default option, the self_pwr pin determines if current sensing will be ganged, or none (ganged if self-powered, none if bus-powered) 5.1.1.8 compound device allows the oem to indicate that the hub is part of a compound (see the usb specification for definition) device. the applicable port(s) must al so be defined as having a ?non-removable device?. this field is set by the oem using either the smbus or eeprom interface options. note: when configured via strapping options, decl aring a port as non-remov able automatically causes the hub controller to report that it is part of a compound device. 5.1.1.9 non-removable device informs the host if one of the active ports has a permanent device that is undetachable from the hub. (note: the device must provide its own descriptor data.) this field is set by the oem using either the smbus or eeprom interface options. when using the internal default option, the no n_rem[1:0] pins will designate the appropriate ports as being non- removable. 5.1.1.10 self-powered port disable during self-powered operation, this selects the ports which will be permanently disabled, and are not available to be enabled or enumerated by a host controller. the disabled ports must be in decreasing order starting with port 2. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.11 bus-powered port disable during bus-powered operation, this selects the ports which will be permanently disabled, and are not available to be enabled or enumerated by a host co ntroller. the disabled ports must be in decreasing order starting with port 2. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.12 dynamic power controls the ability of the 2-port hub to automa tically change from self-powered operation to bus- powered operation if the local power source is re moved or is unavailable (and from bus-powered to self-powered if the local power source is restored). {note: if the local power source is available, the 2-port hub will always switch to self-powered operation.}
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 18 smsc usb2502 datasheet when dynamic power switching is enabled, the hub detects the availability of a local power source by monitoring the external self_pwr pin. if the hub detects a change in power source availability, the hub immediately disconnects and removes power from all downstream devices and disconnects the upstream port. the hu b will then re-attach to the upstream po rt as either a bus-powered hub (if local-power in unavailable) or a self-powered hub (if local power is available). this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.13 over-current timer the time delay (in 2ms increments) for an over-current condition to persist before it is reported to the host. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.14 self-powered max power when in self-powered configuration, sets value in 2ma increments. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.15 bus-powered max power when in bus-powered configuration, sets value in 2ma increments. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.16 self-powered hub controller current when in self-powered configuration, maximum curr ent requirements of the hub controller in 2ma increments. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.17 bus-powered hub controller current when in bus-powered configuration, maximum curr ent requirements of the hub controller in 2ma increments. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.18 power-on timer time (in 2ms intervals) from the time power-on sequence begins on a port until power is good on that port. system software uses this value to determine how long to wait before accessing a powered-on port. this field is set by the oem using either the smbus or eeprom interface options. 5.1.1.19 power switching polarity the selection of active state ?polarity? for the prtpwr2 pin is made by a strapping option only. 5.1.2 vbus detect according to section 7.2.1 of the usb 2.0 specification, a downstream port can never provide power to its d+ or d- pull-up resistors unless the upstream port?s vbus is in the asserted (powered) state. the vbus_det pin on the hub monitors the state of the upstream vbus signal and will not pull-up the d+ or d- resistor if vbus is not active. if vbus goes from an active to an inactive state (not powered), hub will remove power from the d+ or d- pull-up resistor within 10 seconds.
2-port usb 2.0 hub controller datasheet smsc usb2502 19 revision 2.3 (08-27-07) datasheet 5.2 eeprom interface the smsc hub can be co nfigured via a 2-wire (i2c) eeprom. (please see table 4.1, "7-port hub pin descriptions" for specific details on how to enable the i2c eeprom option). the internal state-machine will, (when configured for eeprom support) read the external eeprom for configuration data. the hub will then ?attach? to the upstream usb host. please see ta b l e 5 . 1 user-defined descriptor data for a list of data fields available. 5.2.1 i2c eeprom the i2c eeprom interface implements a subset of the i2c master specification (please refer to the philips semiconductor standard i2c-bus specification for details on i2c bus protocols). the hub?s i2c eeprom interface is designed to attach to a single ?dedicated? i2c eeprom, a nd it conforms to the standard-mode i2c specification (100kbit/s transf er rate and 7-bit addressing) for protocol and electrical compatibility. note: extensions to the i2c specification are not supported. the hub acts as the master and generates the serial clock scl, controls the bus access (determines which device acts as the transmitter and which device acts as the receiver), and generates the start and stop conditions. 5.2.1.1 implementation characteristics please refer to the microchip 24aa00 datasheet for protocol and programming specifics. 5.2.1.2 pull-up resistor the circuit board designer is required to place external pull-up resistors (10k recommended) on the sda/smbdata & scl/smbclk/cfg _selo lines (per smbus 1. 0 specification, and eeprom manufacturer guidelines) to vcc in order to assure proper operation. 5.2.1.3 i2c eepro m slave address slave address is 1010000. note: 10-bit addressing is not supported. 5.2.2 in-circuit eeprom programming the eeprom can be programmed via ate by pullin g reset_n low (which tri-states the hub?s eeprom interface and allows an exter nal source to program the eeprom). 5.2.3 eeprom data table 5.1 user-defined descriptor data field byte msb: lsb size (bytes) default cfg self (hex) default cfg bus (hex) description vid 1:0 2 0424 0424 vendor id (assigned by usb-if). pid 3:2 2 2502 2502 product id (assigned by manufacturer). did 5:4 2 0000 0000 device id (assigned by manufacturer).
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 20 smsc usb2502 datasheet 5.2.3.1 eeprom offset 1:0(h) - vendor id 5.2.3.2 eeprom offset 3:2(h) - product id config data byte 1 6 1 88 0c configuration data byte #1 for hub options. config data byte 2 7 1 90 90 configuration data byte #2 for hub options. non removable device 8 1 00 00 defines the ports that contain attached devices (this is used only when hub is part of a compound device). port disable self-powered 9 1 00 00 selects the ports that will be permanently disabled port disable bus-powered a 1 00 00 selects the ports that will be permanently disabled max power self-powered b 1 01 01 max current for this configuration (expressed in 2ma units). max power bus-powered c 1 64 64 max current for this configuration (expressed in 2ma units). hub controller max current self-powered d 1 01 01 max current (expressed in 2ma units). hub controller max current bus-powered e 1 64 64 max current (expressed in 2ma units). power-on time f 1 32 32 time until power is stable. bit number bit name description 15:8 vid_msb most significant byte of the vendor id. 7:0 vid_lsb least significant byte of the vendor id. bit number bit name description 15:8 pid_msb most significant byte of the product id. 7:0 pid_lsb least significant byte of the product id. table 5.1 user-defined descriptor data (continued) field byte msb: lsb size (bytes) default cfg self (hex) default cfg bus (hex) description
2-port usb 2.0 hub controller datasheet smsc usb2502 21 revision 2.3 (08-27-07) datasheet 5.2.3.3 eeprom offset 5:4(h) - device id 5.2.3.4 eeprom offset 6(h) - config_byte_1 5.2.3.5 eeprom offset 7(h) - config_byte_2 bit number bit name description 15:8 did_msb most significant byte of the device id. 7:0 did_lsb least significant byte of the device id. bit number bit name description 7 self_bus_pwr self or bus power: selects between self- and bus-powered operation. 0 = bus-powered operation. (bus default) 1 = self-powered operation. (self default) note: if dynamic power switching is enabled, this bit is ignored and the self_pwr pin is used to determine if the hub is operating from self or bus power. 6 reserved reserved 5 hs_disable high speed disa ble: disables the capability to attach as either a high/full- speed device, and forces attachment as full-speed only i.e. (no high-speed support). 0 = high-/full-speed. (default) 1 = full-speed-only (high-speed disabled!) 4 reserved reserved 3 eop_disable eop disable: disables eop generation at eof1 when no downstream directed traffic is in progress. 0 = eop generation at eof1 is enabled. 1 = eop generation at eof1 is di sabled, (normal operation). (default) 2:1 current_sns over current sense: indicates whether current sensing is ganged. 00 = ganged sensing (all ports together). (default for self-power) 01 = reserved 1x = over current sensing not support ed. (may be used with bus-powered configurations only!, and is the default for bus-power) 0 reserved reserved bit number bit name description 7 dynamic dynamic power enable : controls the ability for th e hub to transition to bus- powered operation if the local power source is removed (can revert back to self-power if local power source is restored). 0 = no dynamic auto-switching. 1 = dynamic auto-switching capable.(default) 6 reserved reserved
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 22 smsc usb2502 datasheet 5.2.3.6 eeprom offset 8(h) - non-removable device 5.2.3.7 eeprom offset 9(h) - port disable for self powered operation 5.2.3.8 eeprom offs et a(h) - port disable for bus powered operation 5:4 oc_timer overcurrent timer: over current timer delay. 00 = 0.1ms 01 = 2ms (default) 10 = 4ms 11 = 6ms 3 compound compound device: designates if hub is part of a compound device. 0 = no. (default) 1 = yes, hub is part of a compound device. 2:0 reserved reserved. bit number bit name description 7:0 nr_device non-removable device: indicates which port(s) include non-removable devic- es. ?0? = port is removable, ?1? = port is non-removable. bit 7:3= 0; reserved bit 2= 1; port 2 non-removable. bit 1= 1; port 1 non removable. bit 0 is reserved, always = ?0?. bit number bit name description 7:0 port_dis_sp port disable self-powered: disables 1 or more contiguous ports. ?0? = port is available, ?1? = port is disabled. bit 7:3= 0; reserved bit 2= 1; port 2 is disabled. bit 1= 1; port 1 is disabled. bit 0 is reserved, always = ?0? bit number bit name description 7:0 port_dis_bp port disable bus-powered: disables 1 or more contiguous ports. ?0? = port is available, ?1? = port is disabled. bit 7:3= 0; reserved bit 2= 1; port 2 is disabled. bit 1= 1; port 1 is disabled. bit 0 is reserved, always = ?0? bit number bit name description
2-port usb 2.0 hub controller datasheet smsc usb2502 23 revision 2.3 (08-27-07) datasheet 5.2.3.9 eeprom offs et b(h) - max power for self powered operation 5.2.3.10 eeprom offs et c(h) - max power for bus powered operation 5.2.3.11 eeprom offset d(h) - hub controller max current for self powered operation bit number bit name description 7:0 max_pwr_sp max power self_powered: value in 2ma increments that the hub consumes from an upstream port (vbus) when operating as a self-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0ma in its descriptors. note: the usb 2.0 specification does not permit this value to exceed 100ma a value of 50 (decimal) indicates 100ma. bit number bit name description 7:0 max_pwr_bp max power bus_powered: value in 2ma increments that the hub consumes from an upstream port (vbus) when op erating as a bus-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0ma in its descriptors. a value of 50 (decimal) indicates 100ma. bit number bit name description 7:0 hc_max_c_sp hub controller max current self-powered: value in 2ma increments that the hub consumes from an upstream po rt (vbus) when operating as a self- powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value does not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. note: the usb 2.0 specification does not permit this value to exceed 100ma a value of 50 (decimal) indicates 100ma, which is the default value.
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 24 smsc usb2502 datasheet 5.2.3.12 eeprom offs et e(h) - hub controller max current for bus powered operation 5.2.3.13 eeprom of fset f(h) - power-on time 5.3 smbus slave interface instead of loading user-defined descriptor data from an external eeprom, the smsc hub can be configured to receive a code load from an external processor via an smbus interface. the smbus interface shares the same pins as the eeprom in terface, if cfg_sel1 & cfg_sel0 activates the smbus interface, external eeprom support is no lo nger available (and the user-defined descriptor data must be downloaded via the smbu s). due to system issues, the smsc hub waits indefinitely for the smbus code load to complete and only ?appears? as a newly connected device on usb after the code load is complete. the hub?s smbus implementation is a subset of the smbus interface to the host. the device is a slave-only smbus device. the implementation in the device is a subset of smbus since it only supports two protocols. the write byte and read byte protocols are the only valid smbus protocols for the hub. the hub responds to other protocols as described in section 5.3.2, "invalid protocol response behavior," on page 25 . reference the system management bus specification, rev 1.0. the smbus interface is used to read and write the registers in the device. the register set is shown in section 5.3.9, "internal smbus memory register set," on page 26 . 5.3.1 bus protocols typical write byte and read byte protocols are shown below. register accesses are performed using 7-bit slave addressing, an 8-bit register address fiel d, and an 8-bit data field. the shading indicates the hub driving data on the smbdata line; otherwise, host data is on the sda/smbdata line. the slave address is the unique smbus interface address for the hub that identifies it on smbus. the register address field is the internal address of the register to be accessed. the register data field is the data that the host is attempting to write to the register or the contents of the register that the host is attempting to read. note: data bytes are transferred msb first (msb first). bit number bit name description 7:0 hc_max_c_bp hub controller max current bus-powered: value in 2ma increments that the hub consumes from an upstream po rt (vbus) when operating as a self- powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value does not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. a value of 50 (decimal) indicates 100ma, which is the default value. bit number bit name description 7:0 power_on_time power on time: the length of time that is takes (in 2 ms intervals) from the time the host initiated power-on sequence begins on a port until power is good on that port.
2-port usb 2.0 hub controller datasheet smsc usb2502 25 revision 2.3 (08-27-07) datasheet 5.3.1.1 byte protocols when using the hub smbus interface for byte transfers, a write will always consist of the smbus interface slave address byte, followed by the internal address register byte, then the data byte. the normal read protocol consists of a write to the hub with the smbus interface address byte, followed by the internal address register byte. then restart the serial communication with a read consisting of the smbus interface address byte, fo llowed by the data byte read from the hub. this can be accomplished by using the read byte protocol. note: for the following smbus tables: write byte the write byte protocol is used to write data to the r egisters. the data will only be written if the protocol shown in ta b l e 5 . 2 is performed correctly. only one byte is transferred at a time for a write byte protocol. read byte the read byte protocol is used to read data from the registers. the data will only be read if the protocol shown in ta b l e 5 . 3 is performed correctly. only one byte is transferred at a time for a read byte protocol. 5.3.2 invalid protocol response behavior registers that are accessed with an invalid protocol are not updated. a register is only updated following a valid protocol. the only valid protocols are write byte and read byte, which are described above. the hub only responds to the hardware selected slave address. attempting to communicate with the hub over smbus with an invalid slave address or invalid protocol results in no response, and the smbus slave interface returns to the idle state. the only valid registers that are accessible by t he smbus slave address are the registers defined in the registers section. see section 5.3.3 for the response to undefined registers. 5.3.3 general call address response the hub does not respond to a general call address of 0000_000b. table 5.2 smbus write byte protocol field: start slave addr wr ack reg. addr ack reg. data ack stop bits:1 71181811 table 5.3 smbus read byte protocol field: start slave addr wr ack reg. addr ack start slave addr rd ack reg. data nack stop bits: 1 7 1 1 8 1 1 7 1 1 8 1 1 denotes master-to-slave denotes slave-to-master
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 26 smsc usb2502 datasheet 5.3.4 slave device time-out according to the smbus specification, v1.0 devices in a transfer can abort the transfer in progress and release the bus when any single clock low interval exceeds 25ms (t timeout, min ). devices that have detected this condition must reset their communication and be able to receive a new start condition no later than 35ms (t timeout, max ). note: some simple devices do not contain a clock low drive circuit; this simple kind of device typically resets its communications port after a start or stop condition. 5.3.5 stretching the sclk signal the hub supports stretching of the sclk by othe r devices on the smbus. the hub does not stretch the sclk. 5.3.6 smbus timing the smbus slave interface complies with the smbus ac timing specification. see the smbus timing in the ?timing diagram? section. 5.3.7 bus reset sequence the smbus slave interface resets and returns to the idle state upon a start field followed immediately by a stop field. 5.3.8 smbus alert response address the smbalert# signal is not supported by the hub. 5.3.9 internal smbus me mory register set the following table provides the smbus slave interface register map values. table 5.4 smbus slave interface register map reg addr r/w register name abbr bit 7 (msb) bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 (lsb) 00h r/w status/command stcd 7 6 5 4 3 2 1 0 01h r/w vid lsb vidl 7 6 5 4 3 2 1 0 02hr/wvid msb vidm76543210 03h r/w pid lsb pidl 7 6 5 4 3 2 1 0 04hr/wpid msb pidm76543210 05hr/wdid lsb didl76543210 06h r/w did msb didm 7 6 5 4 3 2 1 0 07h r/w config data byte 1 cfg1 7 6 5 4 3 2 1 0 08h r/w config data byte 2 cfg2 7 6 5 4 3 2 1 0 09h r/w non-removable devices nrd76543210 0ah r/w port disable (self) pds 7 6 5 4 3 2 1 0 0bh r/w port disable (bus) pdb 7 6 5 4 3 2 1 0
2-port usb 2.0 hub controller datasheet smsc usb2502 27 revision 2.3 (08-27-07) datasheet 5.3.9.1 register 00h: status/command (reset = 0x00) 5.3.9.2 register 01h: vendor id (lsb) (reset = 0x00) 0ch r/w max power (self) maxps 7 6 5 4 3 2 1 0 0dh r/w max power (bus) maxpb 7 6 5 4 3 2 1 0 0eh r/w hub controller max current (self) hcmcs 7 6 5 4 3 2 1 0 0fh r/w hub controller max current (bus) hcmcb 7 6 5 4 3 2 1 0 10h r/w power-on time pwrt 7 6 5 4 3 2 1 0 bit number bit name description 7:3 reserved reserved. {note: software must never write a ?1? to these bits} 2 reset reset the smbus interface and inter nal memory back to reset_n assertion default settings. {note: during this reset, this bit is automatically cleared to its default value of 0.} 0 = normal run/idle state. 1 = force a reset. 1 write_prot write protect: the external smbus host sets this bit after the hub?s internal memory is loaded with configuration data. {note: the external smbus host is responsible for verification of downloaded data.} 0 = the internal memory (address ra nge 01-10h) is not write protected. 1 = the internal memory (address range 01-10h) is ?write-protected? to prevent unintentional data corruption.} {note: this bit is write once and is only cleared by assertion of the external reset_n pin.} 0 usb_attach usb attach & powe r-down the smbus interface. 0 = default; smbus slave interface is active. 1 = hub will signal a usb attach event to an upstream device, note: smbus slave interface will completely power down after the ack has completed. {note: this bit is write once and is only cleared by assertion of the external reset_n pin.} bit number bit name description 7:0 vid_lsb least significant byte of the vendor id. table 5.4 smbus slave interface register map (continued) reg addr r/w register name abbr bit 7 (msb) bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 (lsb)
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 28 smsc usb2502 datasheet 5.3.9.3 register 02h: vendor id (msb) (reset = 0x00) 5.3.9.4 register 03h: product id (lsb) (reset = 0x00) 5.3.9.5 register 04h: product id (msb) (reset = 0x00) 5.3.9.6 register 05h: device id (lsb) (reset = 0x00) 5.3.9.7 register 06h: device id (msb) (reset = 0x00) 5.3.9.8 register 07h: config_byte_1 (reset = 0x00) bit number bit name description 7:0 vid_msb most significant byte of the vendor id. bit number bit name description 7:0 pid_lsb least significant byte of the product id. bit number bit name description 7:0 pid_msb most significant byte of the product id. bit number bit name description 7:0 did_lsb least significant byte of the device id. bit number bit name description 7:0 did_msb most significant byte of the device id. bit number bit name description 7 self_bus_pwr self or bus power: selects between self- and bus-powered operation. 0 = bus-powered operation. 1 = self-powered operation. note: if dynamic power switching is enabled, this bit is ignored and the self_pwr pin is used to determine if the hub is operating from self or bus power. 6 reserved reserved
2-port usb 2.0 hub controller datasheet smsc usb2502 29 revision 2.3 (08-27-07) datasheet 5.3.9.9 register 08h: configuration data byte 2 (reset = 0x00) 5 hs_disable high speed disa ble: disables the capability to attach as either a high/full- speed device, and forces attachment as full-speed only i.e. (no high-speed support). 0 = high-/full-speed. 1 = full-speed-only (high-speed disabled!) 4 reserved reserved 3 eop_disable eop disable: disables eop gen eration of eof1 when in full-speed mode. 0 = eop generation is normal. 1 = eop generation is disabled. 2:1 current_sns over current sense: indicates whether current sensing isganged. 00 = ganged sensing (all ports together). 01 = reserved1x = over current sensing not supported. (must only be used with bus-powered configurations!) 0 reserved reserved bit number bit name description 7 dynamic dynamic power enable : controls the ability for th e hub to transition to bus- powered operation if the local power source is removed (can revert back to self-power if local power source is restored). 0 = no dynamic auto-switching. 1 = dynamic auto-switching capable. 6 reserved reserved 5:4 oc_timer overcurrent timer: over current timer delay. 00 = 0.1ms 01 = 2ms 10 = 4ms 11 = 6ms 3 compound compound device: designates if hub is part of a compound device. 0 = no. 1 = yes, hub is part of a compound device. 2:0 reserved reserved bit number bit name description
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 30 smsc usb2502 datasheet 5.3.9.10 register 09h: non- removable device (reset = 0x00) 5.3.9.11 register 0ah: port disable for self powered operation (reset = 0x00) 5.3.9.12 register 0bh: port disable for bus powered operation (reset = 0x00) 5.3.9.13 register 0ch: max power for se lf powered operation (reset = 0x00) bit number bit name description 7:0 nr_device non-removable device: indicates which port(s) include non-removable devic- es. ?0? = port is removable, ?1? = port is non-removable. bit 7:3: reserved, always = ?0? bit 2= 1; port 2 non-removable. bit 1= 1; port 1 non removable. bit 0 is reserved, always = ?0?. bit number bit name description 7:0 port_dis_sp port disable self-powered: disables 1 or more contiguous ports. ?0? = port is available, ?1? = port is disabled. bit 7:3= 0; reservedbit 2= 1; port 2 is disabled. bit 1= 1; port 1 is disabled. bit 0 is reserved, always = ?0? bit number bit name description 7:0 port_dis_bp port disable bus-powered: disables 1 or more contiguous ports. ?0? = port is available, ?1? = port is disabled. bit 7:3= 0; reservedbit 2= 1; port 2 is disabled. bit 1= 1; port 1 is disabled. bit 0 is reserved, always = ?0? bit number bit name description 7:0 max_pwr_sp max power self_powered: value in 2ma increments that the hub consumes from an upstream port (vbus) when operating as a self-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0ma in its descriptors. note: the usb 2.0 specification does not permit this value to exceed 100ma a value of 50 (decimal) indicates 100ma.
2-port usb 2.0 hub controller datasheet smsc usb2502 31 revision 2.3 (08-27-07) datasheet 5.3.9.14 register 0dh: max power for bus powered operation (reset = 0x00) 5.3.9.15 register 0eh: hub controller max curr ent for self powered operation (reset = 0x00) 5.3.9.16 register 0fh: hub controller max curre nt for bus powered operation (reset = 0x00) 5.3.9.17 register 10h: power-on time (reset = 0x00) 5.3.9.18 undefi ned registers the registers shown in ta b l e 5 . 4 are the defined registers in the hub. reads to undefined registers return 00h. writes to undefined registers have no effect and do not return an error. bit number bit name description 7:0 max_pwr_bp max power bus_powered: value in 2ma increments that the hub consumes from an upstream port (vbus) when op erating as a bus-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0ma in its descriptors. a value of 50 (decimal) indicates 100ma. bit number bit name description 7:0 hc_max_c_sp hub controller max current self-powered: value in 2ma increments that the hub consumes from an upstream po rt (vbus) when operating as a self- powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value does not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. note: the usb 2.0 specification does not permit this value to exceed 100ma a value of 50 (decimal) indicates 100ma, which is the default value. bit number bit name description 7:0 hc_max_c_bp hub controller max current bus-powered: value in 2ma increments that the hub consumes from an upstream po rt (vbus) when operating as a bus- powered hub. this value will include the hub s ilicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value will not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. a value of 50 (decimal) would indicate 100ma, which is the default value. bit number bit name description 7:0 power_on_time power on time: the length of time that it takes (in 2 ms intervals) from the time the host initiated power-on sequence begins on a port until power is good on that port.
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 32 smsc usb2502 datasheet 5.3.9.19 reserved registers unless otherwise instructed, only a ?0? may be written to all reserved registers or bits. 5.4 default configuration option: the smsc hub can be configured via its internal defa ult configuration. (please see for specific details on how to enable default configuration. please refer to table 5.1 on page 19 for the internal default values that are loaded when this option is selected. 5.5 default strapping options: the smsc hub can be configured via a combination of internal default values and pin strap options. please see table 4.1, "7-port hub pin descriptions" for specific details on how to enable the default/pin-strap configuration option. the strapping option pins only cover a limited sub-set of the configuration options. the internal default values will be used for the bits & registers that ar e not controlled by a stra pping option pin. please refer to table 5.1 on page 19 for the internal default values that are loaded when this option is selected. the green led pins are sampled after reset_n negatio n, and the logic values are used to configure the hub if the internal default configuration mode is selected. the implementation shown below (see figure 5.1 ) shows a recommended passive scheme. when a pin is configured with a ?strap high? configuration, the led functions wi th active low signalling, and the pa d will ?sink? the current from the external supply. when a pin is configured with a ?strap low? configuration, the led functions with active high signalling, and the pad will ?source? the current to the external led. figure 5.1 led strapping option 5.6 reset there are two different resets th at the hub experiences. one is a hardware reset (via the reset_n pin) and the second is a usb bus reset. hub 50k strap low gr2 50k strap high gr1 +v
2-port usb 2.0 hub controller datasheet smsc usb2502 33 revision 2.3 (08-27-07) datasheet 5.6.1 external hardware reset_n a valid hardware reset is defined as, assertion of reset_n for a minimum of 1us after all power supplies are within operating range. while reset is asserted, the hub (and its associated external circuitry) consumes less than 500 a of current from the upstream usb power source (300 a for the hub and 200 a for the external circuitry). assertion of reset_n (external pin) causes the following: 1. all downstream ports are disabled, and prtpwr power to downstream devices is removed. 2. the phys are disabled, and the differential pairs will be in a high-impedance state. 3. all transactions immediately terminate; no states are saved. 4. all internal registers return to the default state (in most cases, 00(h)). 5. the external crystal oscillator is halted. 6. the pll is halted. 7. led indicators are disabled. the hub is ?operational? 500 s after reset_n is negated. once operational, the hub immediately reads oem-sp ecific data from the external eeprom (if the smbus option is not disabled). 5.6.1.1 reset_n for strappin g option configuration figure 5.2 reset_n timing fo r default/stra p option mode table 5.5 reset_n timing fo r default/strap option mode name description min typ max units t1 reset_n asserted. 1 sec t2 strap setup time 16.7 nsec t3 strap hold time. 16.7 1400 nsec t4 hub outputs driven to inactive logic states 2.0 1.5 sec t5 usb attach (see note). 100 msec t1 t4 t5 t6 t7 t8 valid don? care don? care driven by hub if strap is an output. reset_n vss strap pins vss hardware reset asserted read strap options drive strap outputs to inactive levels attach usb upstream usb reset recovery idle start completion request response t2 t3
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 34 smsc usb2502 datasheet notes: ? when in bus-powered mode, the hub and its associated circuitry must not consume more than 100ma from the upstream usb power source during t1+t5. ? all power supplies must have reached the operating levels mandated in section chapter 7, "dc parameters" , prior to (or coincident wi th) the assertion of reset_n. 5.6.1.2 reset_n for eeprom configuration figure 5.3 reset_n ti ming for eeprom mode notes: ? when in bus-powered mode, the hub and its associated circuitry must not consume more than 100ma from the upstream usb power source during t4+t5+t6+t7. t6 host acknowledges attach and signals usb reset. 100 msec t7 usb idle. undefined msec t8 completion time for requests (with or without data stage). 5msec table 5.6 reset_n timing for eeprom mode name description min typ max units t1 reset_n asserted. 1 sec t2 hub recovery/stabilization. 500 sec t3 eeprom read / hub config. 2.0 99.5 msec t4 usb attach (see note). 100 msec t5 host acknowledges attach and signals usb reset. 100 msec t6 usb idle. undefined msec t7 completion time for requests (with or without data stage). 5msec table 5.5 reset_n timing for defaul t/strap option mode (continued) name description min typ max units t1 t2 t4 t5 t6 t7 reset_n vss hardware reset asserted read strap options read eeprom + set options attach usb upstream usb reset recovery idle start completion request response t3
2-port usb 2.0 hub controller datasheet smsc usb2502 35 revision 2.3 (08-27-07) datasheet ? all power supplies must have reached the operating levels mandated in section chapter 7, "dc parameters" , prior to (or coincident wi th) the assertion of reset_n. 5.6.1.3 reset_n for smbus slave configuration figure 5.4 reset_n timing for smbus mode notes: ? for bus-powered configurations, the 99.5ms (max) is required, and the hub and its associated circuitry must not consume more than 100ma from the upstream usb power source during t2+t3+t4+t5+t6+t7. for self-powered configurations, t3 max is not applicable and the time to load the configuration is determined by the external smbus host. ? all power supplies must have reached the operating levels mandated in section chapter 7, "dc parameters" , prior to (or coincident wi th) the assertion of reset_n. table 5.7 reset_n timing for smbus mode name description min typ max units t1 reset_n asserted. 1 sec t2 hub recovery/stabilization. 500 sec t3 smbus code load (see note). 10 99.5 msec t4 hub configuration and usb attach. 100 msec t5 host acknowledges attach and signals usb reset. 100 msec t6 usb idle. undefined msec t7 completion time for requests (with or without data stage). 5msec t1 t2 t4 t5 t6 t7 reset_n vss hardware reset asserted reset negation smbus code load attach usb upstream usb reset recovery idle start completion request response t3 hub phy stabilization
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 36 smsc usb2502 datasheet 5.6.2 usb bus reset in response to the upstream port signaling a reset to the hub, the hub does the following: note: the hub does not propagate the upstream usb reset to downstream devices. 1. sets default address to 0. 2. sets configuration to: unconfigured. 3. negates prtpwr to all downstream ports. 4. clears all tt buffers. 5. moves device from suspended to active (if suspended). 6. complies with section 11.10 of the usb 2.0 specification for behavior after completion of the reset sequence. the host then configures the hub and the hub?s downstream port devices in accordance with the usb specification.
2-port usb 2.0 hub controller datasheet smsc usb2502 37 revision 2.3 (08-27-07) datasheet chapter 6 xnor test xnor continuity tests all signal pins on the hub (every pin except for nc, xtal1/clkin, xtal2, atest/reg_en, rbias, test, power, and ground). this functionality is enabled by driving test and cfg_sel[1] high, driving sclk low and transition reset_n from low to high. the output from the xnor chain is driven to gr2 . for each pin tested for continuity gr2 should toggle.
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 38 smsc usb2502 datasheet chapter 7 dc parameters 7.1 maximum guaranteed ratings note: stresses above the specified parameters could cause permanent damage to the device. this is a stress rating only and functional operation of the device at any condition above those indicated in the operation sections of this sp ecification is not implied. when powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or dev ice failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output . when this possibility exists, it is suggested that a clamp circuit be used. parameter symbol min max units comments storage temperature t a -55 150 c lead temperature 325 c soldering < 10 seconds 1.8v supply voltage v dda18pll v dd18 -0.3 2.5 v 3.3v supply voltage v dda33 v dda33pll v dd33cr -0.3 4.0 v voltage on any i/o pin -0.3 (3.3v supply voltage + 2) 6v voltage on xtal1 -0.3 4.0 v voltage on xtal2 -0.3 v dd18 + 0.3v v
2-port usb 2.0 hub controller datasheet smsc usb2502 39 revision 2.3 (08-27-07) datasheet 7.2 recommended operating conditions parameter symbol min max units comments operating temperature t a 070c 1.8v supply voltage v dda18pll v dd18 1.62 1.98 v 3.3v supply voltage v dda33 v dda33pll v dd33cr 3.0 3.6 v voltage on any i/o pin -0.3 5.5 v if any 3.3v supply voltage drops below 3.0v, then the max becomes: (3.3v supply voltage + 0.5) voltage on xtal1 -0.3 v dda33 v voltage on xtal2 -0.3 v dd18 v table 7.1 dc electrical characteristics parameter symbol min typ max units comments i, is type input buffer low input level high input level input leakage hysteresis (?is? only) v ili v ihi i il v hysi 2.0 -10 250 300 0.8 +10 350 v v ua mv ttl levels v in = 0 to v dd33 cr input buffer with pull-up (ipu) low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +5 -10 0.8 +45 +10 v v ua ua ttl levels v in = 0 v in = v dd33 cr input buffer with pull-down ipd low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +10 -80 0.8 -10 -160 v v ua ua ttl levels v in = 0 v in = v dd33 cr
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 40 smsc usb2502 datasheet iclk input buffer low input level high input level input leakage hysteresis v ilck v ihck i il v hysc 2.0 -10 50 0.8 +10 100 v v ua mv ttl levels v in = 0 to v dd33 cr o8 and i/o8 type buffer low output level high output level output leakage v ol v oh i ol 2.4 -10 0.4 +10 v v ua i ol = 8 ma @ v dd33 cr = 3.3v i oh = -4ma @ v dd33 cr = 3.3v v in = 0 to v dd33 cr (note 1) i/osd12 type buffer low output level output leakage hysteresis v ol i ol v hysi -10 250 300 0.4 +10 350 v a mv i ol = 12 ma @ v dd33 cr = 3.3v v in = 0 to v dd33 cr (note 1) io-u (note 2) i-r (note 3) supply current unconfig- ured high-speed host full-speed host i ccinit i ccinit 73 65 ma ma supply current configured (high-speed host) 2 ports @ fs/ls 2 ports @ hs 1 port hs, 1 port fs/ls i hcc2 i hch2 i hch1c1 120 170 140 ma ma ma total from all supplies supply current configured (full-speed host) 1 port 2 ports i fcc1 i fcc2 90 90 ma ma total from all supplies table 7.1 dc electrical ch aracteristics (continued) parameter symbol min typ max units comments
2-port usb 2.0 hub controller datasheet smsc usb2502 41 revision 2.3 (08-27-07) datasheet notes: 1. output leakage is measured with the current pins in high impedance. 2. see usb 2.0 specification for usb dc electrical characteristics. 3. rbias is a 3.3v tolerant analog pin. capacitance t a = 25c; fc = 1mhz; v dd33cr = 3.3 v power sequencing there are no power supply sequence restrictions for the hub. the order in which power supplies power-up and power-down is implementation dependent. supply current suspend i csby 320 425 ua total from all supplies. supply current reset i rst 160 300 ua total from all supplies. limits parameter symbol min typ max unit test condition clock input capacitance c in 12 pf all pins except usb pins (and pins under test tied to ac ground) input capacitance c in 8pf output capacitance c out 12 pf table 7.1 dc electrical ch aracteristics (continued) parameter symbol min typ max units comments
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 42 smsc usb2502 datasheet chapter 8 ac specifications 8.1 oscillator/clock crystal: parallel resonant, fundamental mode, 24 mhz 100ppm. external clock: 50% duty cycle 10%, 24 mhz 100ppm, jitter < 100 ps rms. 8.1.1 smbus interface: the smsc hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the smbus 1.0 specification for slave-only devices (except as noted in section 5.3 ). 8.1.2 i2c eeprom: frequency is fixed at 59khz 20%. 8.1.3 usb 2.0 the hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the usb 2.0 specification. please refer to the usb specification for more information.
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 43 smsc usb2502 datasheet chapter 9 package outlines figure 9.1 36 pin qfn package - see spec front page for revision history -- decimal x.x x.xx x.xxx material finish std compliance third angle projection print w i th "sc ale to fit" do not scale drawing approved angular unless otherwise specified dimensions are in millimeters and tolerances are: dim and tol per asme y14.5m - 1994 drawn checked name scale 80 arkay drive hauppauge, ny 11788 usa dwg number title date sheet rev revision history description revision released by date s.k.iliev s.k.iliev s.k.iliev 1 - - 0.025 0.05 0.1 12/6/04 1:1 12/6/04 12/6/04 f jedec: mo-220 1 of 1 36 terminal qfn, 6x6mm body, 0.5mm pitch package outline mo-36-qfn-6x6 side view 3-d views top view 3 2 bottom view notes: 1. all dimensions are in millimeter. 2. position tolerance of each terminal is 0.05mm at maximum material condition. dimensions "b" applies to plated terminals and it is measured between 0.15 and 0.30 mm from the terminal tip. 3. details of terminal #1 identifier are optional but must be located within the area indicated. 4. coplanarity zone applies to exposed pad and terminals. e2 e e1 0.6(max) 0.6(max) d d1 terminal #1 identifier area (d1/2 x e1/2) 36x b 36x l terminal #1 identifier area (d/2 x e/2) d2 e exposed pad 3 a1 a2 a chamfered corners are optional 4x 36x 0.2 min 4 ccc c 4 c a3 4x 0-12 d2 / e2 variations catalog part
2-port usb 2.0 hub controller datasheet revision 2.3 (08-27-07) 44 smsc usb2502 datasheet figure 9.2 48 pin tqfp package outl ine (7x7x1.4 mm body, 2mm footprint) notes: 1. controlling unit: millimeter. 2. tolerance on the true position of the leads is 0.04 mm maximum. 3. package body dimensions d1 and e1 do not include the mold protrusion. maximum mold protrusion is 0.25 mm. 4. dimension for foot length l measured at the gauge plane 0.25 mm above the seating plane. 5. details of pin 1 identifier are optional but must be located within the zone indicated . table 9.1 48 pin tqfp package min nominal max remarks a ~ ~ 1.60 overall package height a1 0.05 ~ 0.15 standoff a2 1.35 ~ 1.45 body thickness d 8.80 ~ 9.20 x span d1 6.90 ~ 7.10 x body size e 8.80 ~ 9.20 y span e1 6.90 ~ 7.10 y body size h 0.09 ~ 0.20 lead frame thickness l 0.45 0.60 0.75 lead foot length l1 ~ 1.00 ~ lead length e 0.50 basic lead pitch 0 o ~7 o lead foot angle w 0.17 0.22 0.27 lead width r1 0.08 ~ ~ lead shoulder radius r2 0.08 ~ 0.20 lead foot radius ccc ~ ~ 0.08 coplanarity

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