? semiconductor components industries, llc, 2012 april, 2012 ? rev. 3 1 publication order number: evbum2103/d NCN9252MUGEVB high-speed usb 2.0 (480 mbps) dp3t switch for usb/uart/data multiplexing evaluation board user's manual overview the ncn9252 is a dp3t switch for combined uart and usb 2.0 high ? speed data applications. it allows portable systems to use a single external port to transmit and receive signals to and from three separate locations within the portable system. it is comprised of two switches, each with a single common i/o that alternates between three terminals. they are operated together to allow three data sources, such as a usb or uart transceiver, to pass differential data through a shared usb connector port. the ncn9252 features low ron ? 4 (max) at 4.2 v v cc , 5 (typ) at a 3.3 v v cc . it also features low con, < 30 pf (max) across the supply voltage range. this performance makes it ideal for both usb full ? speed and high speed applications that require both low ron and con for effective signal transmission. the ncn9252 is capable of accepting control input signals down to 1.4 v, over a range of v cc supply voltages with minimal leakage current. the ncn9252 is offered in a pb ? free, 12 pin, 1.7 x 2.0 x 0.5 mm, uqfn package. figure 1. board photo http://onsemi.com eval board user?s manual
NCN9252MUGEVB http://onsemi.com 2 figure 2. functional block diagram 1s1 1s2 1s3 2s1 2s2 2s3 com1 com2 in1 in2 control logic table 1. function table in1 [0] in2 [1] com1 closed to: com2 closed to: 0 0 no connect no connect 1 0 1s1 2s1 0 1 1s2 2s2 1 1 1s3 2s3 get started... equipment needed ? power supply ? 2 banana cables ? computer ? usb flash drive ? usb cable procedure 1. set the power supply to 3.3 v. connect the power supply from v cc to gnd using the banana cables. the supply current should be less than 1 a. 2. connect the usb drive to the common i/o usb port, j1. 3. connect the usb cable from the desired output port to the computer 4. select the output port by moving the jumpers to the appropriate logic level for in1 and in2, as shown in the function table in table 1.
NCN9252MUGEVB http://onsemi.com 3 board schematic figure 3. board schematic table 2. bill of materials designator qty description value tolerance footprint manufacturer manufacturer part number substitution allowed lead free c1 1 ceramic capacitor smd 1 f 10% 805 avx corporation grm155r60j105 yes yes c2 1 ceramic capacitor smd 0.1 f 10% 603 avx corporation 0603yc104kat2a yes yes j1 1 usb typea connector surface mount n/a n/a usb typea mill ? max 896 ? 43 ? 004 ? 00 ? 000000 yes yes j2, j3 2 3 ? pin header n/a n/a header3 tyco electronics 5 ? 826629 ? 0 yes yes j2, j4 2 2 ? pin jumper n/a n/a n/a tyco electronics 4 ? 881545 ? 2 yes yes j4, j5, j6 3 usb typeb connector through ? hole n/a n/a usb typeb adam tech usb ? b ? s ? ra yes yes j7, j8 2 banana connector n/a n/a 7mm hole johnson components 111 ? 2223 ? 001 yes yes j9, j10, j11, j12 4 standoff nut n/a n/a n/a keystone electronics 1903c yes yes j9, j10, j11, j13 4 standoff screw n/a n/a n/a keystone electronics 4814k ? nd yes yes tp1, tp3, tp4, tp5, tp6, tp7, tp8, tp9, tp10, tp11, tp12 11 test point pc multi purpose n/a n/a 1mm hole keystone electronics 5000 yes yes tp2 1 pcb shorting link n/a n/a gnd_strap harwin d3082 ? 46 yes yes u1 1 ncn9252 n/a n/a uqfn12 on semiconductor ncn9252mutag no yes
NCN9252MUGEVB http://onsemi.com 4 pcb layout guidelines electrical layout considerations implementing a high speed usb device requires paying attention on usb lines and traces to preserve signal integrity. the demonstration board serves as a layout example and can support the design engineers to preserve high speed performances. electrical layout guidelines are: ? the bypass capacitor must be placed as close as possible to the v cc input pin for noise immunity . ? the characteristic impedance of each high speed usb segment must be 45 . ? the ground plane of the pcb will be used to determine the characteristic impedance of each line. ? all corresponding d+ / d ? line segment pairs must be the same length. ? the use of vias to route these signals should be avoided when possible . ? the use of turns or bends to route these signal should be avoided when possible . evaluation board pcb layout figure 4. evaluation board layout. top layer: magenta. bottom layer: cyan.
NCN9252MUGEVB http://onsemi.com 5 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 evbum2103/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
|
