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BU21021GUL product structure silicon monolithic integrated circuit this product is not designed prot ection against radioactive rays . 1/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 tsz22111 ? 14 ? 001 www.rohm.com datashee t 4-wire resistive touch screen controller BU21021GUL general description BU21021GUL is a resistive touch screen controller, which is capable of detecting 2 points touch with a legacy 4-wire resistive touch screen. BU21021GUL is capable of detecting x/y coordinates, touch pressure in 1 point detection mode, and a pair of x/y coordinates in 2 point detection mode. it is also capable of recogniz ing multiple finger gestures from coordinate data variation and notifying to host with gesture detection flags respectively. BU21021GUL employs embedded cpu for noise filtering, coordinate calcul ation, gesture detection and other signal processing required on a chip. feature legacy 4-wire resistive touch screen is applicable 1 point / 2 points touch detection on chip coordinate generation multiple gesture detections 3v single power supply higher coordinate resolution with 12-bit sar a/d converter on chip clock generator selectable host i/f(ifsel pin) 4-wire spi / 2-wire serial bus key specification power supply voltage temperature range standby current sleep current operating current coordinate resolution 2.7v to 3.6v -25 to 85 5.0ua (max.) 60ua (typ.) 4.0ma (typ.) 12bit package vcsp50l2 2.70 mm x 2.65 mm x 0.55(max) mm application equipments with user interface employing 4-wire resistive touch screen. mobile phone, tablet pc, pda or other portable information devices. digital still camera, digital video camera, portable tv or other audio-visual devices. note pc, touch screen monitor, printer or other pc peripherals. application circuit example (2-wire serial i/f, slave ad dress=b8h, non-use eeprom) figure 1. application circuit example
datasheet d a t a s h e e t 2/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL pin layout 1 2 3 4 5 a t4 pvdd dvdd vdd dvss b xp avdd avss dvdd_ext c xn yp rstb t1 t2 d yn sel_csb so t3 ifsel e ecl eda scl_sck sda_si int top view figure 2. pin layout pin descriptions pin no. pin name i/o description equivalent circuit d1 yn i/o yn channel input. d c1 xn i/o xn channel input. d c2 yp i/o yp channel input. d b1 xp i/o xp channel input. d a1 t4 i/o test input / output. d a2 pvdd o regulator output for touch screen voltage supply. d b3 avdd o regulator output for analog circuit. d a2 dvdd i/o regulator ou tput for digital circuit d b4 avss - analog ground. - a4 vdd - chip power supply. - a5 dvss - digital ground. - b5 dvdd_ext i digital power supply select. l=internal h=external a c3 rstb i reset (low active) c c4 t1 i test input. a c5 t2 i test input. a d4 t3 i test input. a d5 ifsel i host interface selec t. (l=4-wire spi, h= 2-wire serial) a d3 so o 2-wire serial high impedance 4-wire spi data output o e5 int o interrupt e d2 sel_csb i 2-wire serial slave address select 4-wire spi chip select i e4 sda_si i/o 2-wire serial data in put / output 4-wire spi data input i/o e3 scl_sck i 2-wire serial clock input 4-wire spi clock input i e2 eda i/o sda for eeprom b e1 ecl i/o scl for eeprom b (*1) bypass avdd and dvdd to gnd with 1.0 uf capacitor and pvdd and t4 need terminal opening. (*2) digital voltage can be supplied by dvdd when dvdd_ext=h. (*3) ecl and eda need pull-up with 4.7k ? resister in use case. if not use, connect to gnd. (*4) scl_sck and sda_si need pull-up with over 4.7k ? resister and so need terminal opening when use 2-wire serial i/f. (*5) above parameters are only recommended for use. absolute reliability is not guaranteed. (*6) when vdd is not supplied, state of rstb=?h? is prohibition.
datasheet d a t a s h e e t 3/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL i/o equivalent circuits equivalent circuit a equivalent circuit b equivalent circuit c equivalent circuit d equivalent circuit e figure 3. i/o equivalent circuits
datasheet d a t a s h e e t 4/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL overview BU21021GUL is a resistive touch screen c ontroller, which is capable of detecting 2 points touch with a legacy 4-wire resistive touch screen. it is composed of 32-bit cpu, 12-bit sar a/d converter, clock oscillator, and voltage regulators power supply, and operates at a single power supply ranging fr om 2.7 to 3.6v. BU21021GUL is capable of detecting x/y coordinates, touch pressure in 1 point detection mode, and a pair of x/y coordinates in 2 point detection mode. it is also capable of recognizing multiple finger gestures from coordinate data vari ation and notifying to host with gesture detection flags respectively.BU21021GUL employs embedded cp u for noise filtering, coor dinate calculation, gesture detection and other signal processing required on a chip. BU21021GUL senses panel terminal voltages periodically, filter s noise, then calculates coordinates in its operation mode. host will be noticed by a interrupt signal (int) when resister values are updated. 1 point detection touch detection and touch pressure detection are processed on chip, and BU21021GUL operates as a legacy resistive touch controller employi ng 4-wire resistive touch screen. BU21021GUL has 2 point touch detection function, which prevents itself from common misdetection of single ?midpoint? coordinate output. 2 points detection 2 point detection is held by monitoring electric condition of a touch sensor and calculating coordinates on each axis. the process is different from legacy 1 point touch detection, therefore BU21021GUL requir es setup of panel parameter in advance. BU21021GUL automatically detects ether 1 point or 2 points touch input. gesture detection BU21021GUL is able to detect 1 point flick gesture for 4 directions and 2 point zoom in/out, pinch/spread and rotate gestures respectively. gesture detection events are r eported to host as detection flags and interrupt. each of gesture detection sensitivities can be set as register parameters respectively. (note) gesture flags only repot its events. operation speed and movement have to be calculate on host using coordinate data. auto power on / off function auto power off function will power off to sleep condition in order to reduce power consumption when no touch input is detected. BU21021GUL will automatically change to operati on state when touch event is detected in sleep state. this function is able to be enabled / disabled, and threshold leve l of sleep state transition is able to be set by registers. host interface BU21021GUL works as slave device of host mcu connected 2-wire serial bus or 4-wire spi. it is selectable by ifsel pin condition. (ifsel=gnd 4-wire spi ifsel=vdd 2-wire serial bus) eeprom firmware has to be downloaded on BU21021GUL in order to rea lize these functions. the file size of firmware is 16kb (16384 bytes). a "host interface" and "external eeprom" can be chosen as the download method. dvdd external supply setup in the case there exists 1.8v power supply on application system, the external 1.8v supply can be applicable to dvdd in order to reduce sleep power consumption to 10ua.
datasheet d a t a s h e e t 5/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL block diagram figure 4. block diagram description of blocks screen-i/f : 4-wire touch screen interface adc : 12-bit sar a/d converter osc : 20mhz oscillator for internal block regulator : internal power supply. dvdd can be supplied from external clock generator : system clock and internal timing generation cpu : noise filtering, dual touch dete ction and touch coordinates generation work memory : cpu work memory program memory : cpu program memory eeprom-i/f : external eeprom-i/f fo r cpu program memory downloads host-i/f : 4-wire spi i/f / 2-wire serial bus i/f filter : median average filter (maximum 16 data)
datasheet d a t a s h e e t 6/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL absolute maximum ratings *1 ambient temperature reduces a permission loss by 9.10mw per ca se more than 25 degree celsius, 1degree celsius. condition: as sembly on the epoxy-glass (50x58x1.75mm) recommended operating conditions electrical characteristics at ta = 25 , vdd = 3.0v, unless otherwise noted. *1 the supply of digital power (1.8 v) is needed from the terminal dvdd. parameter symbol rating unit conditions power-supply voltage vdd -0.3 to 4.5 v input voltage vin vss- 0.3 to vdd+0.3 v power dissipation pd 910 *1 mw storage temperature range tstg -50 to 125 parameter symbol rating unit conditions min typ max power-supply voltage vdd 2.7 3.0 3.6 v digital power-supply voltage dvdd 1.62 1.80 1.98 v dvdd_ext = h operating temperature r ange topr -20 25 85 parameter symbol rating unit conditions min typ max low-level input voltage vil vss-0.5 - 0.2xvdd v high-level input voltage vih 0.8xvdd - vdd+0.5 v low-level output voltage vol - - vss+0.4 v high-level output voltage voh vdd-0.4 - - v standby current ist - - 5 ua rstb=l sleep current1 icc1 - 60 100 ua dvdd_ext=l sleep current2 icc2 - 10 20 ua dvdd_ext=h (*1) operating current idd - 4 8 ma no load clock frequency freq 15 20 24 mhz
datasheet d a t a s h e e t 7/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL host-i/f timing speci fication (4-wire spi) (note: sck=scl_sck, si=sda_si, csb=sel_csb and so=so) 4-wire spi has the burst write and burst read. the automatic address increment is done until 0x5f. af ter address 0x5f is accessed, it is not changed. wa6 wa5 wa4 wa3 wa2 wa1 wa0 wd7 wd6 wd5 wd4 wd3 wd2 wd1 wd0 wd7 wd6 wd1 wd0 ra6ra5ra4ra3ra2ra1ra0 rd7 rd6 rd5 rd4 rd3 rd2 rd1 rd0 rd7 rd6 rd1 rd0 rd7 csb sck si write si read so read register address write (wa) write (wa + 1) write (wa + n) register address read (ra) read (ra + 1) read (ra + n) hiz hiz t 1 t 2 t 3 t 4 t 5 t 8 t 9 t6 t7 w/r w/r figure 5. timing specification (4-wire spi) table 1. timing requirements: 4-wire spi at vdd = 3.0v, ta = 25 parameter symbol rating unit conditions min typ max csb setup time t 1 30 - - ns ?h? width of sck t 2 30 - - ns ?l? width of sck t 3 30 - - ns si setup time t 4 20 - - ns si holding time t 5 20 - - ns csb holding time t 6 20 - - ns ?h? width of csb t 7 50 - - ns so output delay time t 8 - - 15 ns sck frequency t 9 - - 15 mhz
datasheet d a t a s h e e t 8/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL host-i/f timing specification (2-wire serial) (note: scl=scl_sck, sda=sda_si) 2-wire serial has the burst write and burst read. the automatic address increment is done until 0x5f. af ter address 0x5f is accessed, it is not changed. this 2-wire serial i/f is not corresponded to re-sta rt command. send start condition after send stop condition. the slave address of 2-wire serial is b8h / bah which is decided by the state of the terminal sel_csb. sel_csb = ?l? : slave address = b8h ( 7bit = 5ch + w/r bit ) sel_csb = ?h? : slave address = bah ( 7bit = 5dh + w/r bit ) figure 6. timing specification (2-wire serial) table 2. timing requirements: 2-wire serial at vdd = 3.0v, ta = 25 parameter symbol rating unit condition min typ max scl clock frequency f scl 0 - 400 khz start hold time t hd:sta 0.6 - - us "l" width of scl t low 1.3 - - us "h" width of scl t high 0.6 - - us data hold time t hd:dat 0.1 - - us data setup time t su:dat 0.1 - - us stop setup time t su:sto 0.6 - - us ? write protocol s slave address w a register address a write data ap 7bit = 5ch or 5dh 8bit 8bit ? read protocol s slave address w a register address aps slave address r a read data np 7bit = 5ch or 5dh 8bit 7bit = 5ch or 5dh 8bit from master to slave s : start condition from slave to master p : stop condition r : data direction read (sda high) w : data direction write (sda low) a : acknowledge (sda low) n : not acknowledge (sda high) figure 7. read/write protocol
datasheet d a t a s h e e t 9/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL typical application circuit BU21021GUL has two selectable host interfaces (4-wire spi and 2-wire serial). the figure below shows the example of circuit when each interface is used. (show by the terminal display though BU21021GUL is csp package.) option(*1) for reject and reduce the noise from touch screen / lcd module or wiring. option(*2) it is not necessary to mount eeprom when firmware download setting is host. connect to ecl/eda to vss. please connect eeprom when firmware download setting is eeprom. option(*3) in using with slave address = bah case, connect sel_csb to vdd. figure 8. application circuit 1 (4-wire spi) figure 9. application circuit 2 (2-wire serial bus)
datasheet d a t a s h e e t 10/10 tsz02201-0y1y0f300060-1-2 ? 2012 rohm co., ltd. all rights reserved. 19.jun.2012 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BU21021GUL ordering information physical dimension tape and reel information marking diagram (top view) bu 21021gu l-e2 package tape and reel information gul: vcsp50l2 e2: embossed carrier tape part number ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs e2 () direction of feed reel 1pin
datasheet d a t a s h e e t notice - rev.003 ? 2012 rohm co., ltd. all rights reserved. notice general precaution 1) before you use our products, you are requested to care fully read this document and fully understand its contents. rohm shall not be in any way responsible or liable for fa ilure, malfunction or accident arising from the use of any rohm?s products against warning, caution or note contained in this document. 2) all information contained in this document is current as of the issuing date and subjec t to change without any prior notice. before purchasing or using rohm?s products, please confirm the la test information with a rohm sales representative. precaution on using rohm products 1) our products are designed and manufactured for applicat ion in ordinary electronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring extremel y high reliability (such as medical equipment, transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (?specific applications?), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, ro hm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hm?s products for specific applications. 2) rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3) our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohm?s products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified bel ow), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4) the products are not subjec t to radiation-proof design. 5) please verify and confirm characteristics of the final or mounted products in using the products. 6) in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse) is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7) de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8) confirm that operation temperature is within t he specified range described in the product specification. 9) rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document.
datasheet d a t a s h e e t notice - rev.003 ? 2012 rohm co., ltd. all rights reserved. precaution for mounting / circuit board design 1) when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2) in principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification precautions regarding application examples and external circuits 1) if change is made to the constant of an external circuit, pl ease allow a sufficient margin c onsidering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2) you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own indepen dent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1) product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2) even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3) store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4) use products within the specified time after opening a hum idity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohm?s internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1) all information and data including but not limited to application example contain ed in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2) no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document.
datasheet d a t a s h e e t notice - rev.003 ? 2012 rohm co., ltd. all rights reserved. other precaution 1) the information contained in this document is provi ded on an ?as is? basis and rohm does not warrant that all information contained in this document is accurate and/or error-free. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or concerning such information. 2) this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 3) the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 4) in no event shall you use in any way whatsoever the pr oducts and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 5) the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties.

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