BU21021GUL Datasheet 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 recognizing multiple finger gestures from coordinate data variation and notifying to host with gesture detection flags respectively. BU21021GUL employs embedded CPU for noise filtering, coordinate calculation, gesture detection and other signal processing required on a chip. ●Key Specification ■ Power supply voltage ■ Temperature range ■ Standby current ■ Sleep current ■ Operating current ■ Coordinate resolution ●Package VCSP50L2 2.7V to 3.6V -25℃ to 85℃ 5.0uA (Max.) 60uA (Typ.) 4.0mA (Typ.) 12bit 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. ●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 ●Application Circuit Example (2-wire serial I/F, Slave address=B8h, non-use EEPROM) Figure 1. Application circuit example ○Product structure：Silicon monolithic integrated circuit .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product is not designed protection against radioactive rays 1/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet 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 Equivalent circuit Pin no. Pin Name I/O Description 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 output 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 select. (L=4-wire SPI, H=2-wire serial) D3 SO O E5 INT O 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 input / output 4-wire SPI Data input I/O E3 SCL_SCK I 2-wire serial Clock input 4-wire SPI Clock input E2 EDA I/O SDA for EEPROM B E1 ECL I/O SCL for EEPROM B 2-wire serial High impedance A 4-wire SPI Data output Interrupt O E I (*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 4.7kΩ resister in use case. If not use, connect to GND. (*4) SCL_SCK and SDA_SI need pull-up with over 4.7kΩ 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. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet 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 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet BU21021GUL ●Overview BU21021GUL is a resistive touch screen controller, 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 from 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 variation and notifying to host with gesture detection flags respectively.BU21021GUL employs embedded CPU for noise filtering, coordinate calculation, gesture detection and other signal processing required on a chip. BU21021GUL senses panel terminal voltages periodically, filters 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 employing 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 requires 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 reported 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 operation state when touch event is detected in sleep state. This function is able to be enabled / disabled, and threshold level 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 realize 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. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet 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 detection and touch coordinates generation Work memory : CPU work memory Program memory : CPU program memory EEPROM-I/F : External EEPROM-I/F for 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) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet BU21021GUL ●Absolute Maximum Ratings Parameter Symbol Rating Unit Power-supply voltage VDD -0.3 to 4.5 V Input voltage VIN VSS-0.3 to VDD+0.3 V Power dissipation *1 Pd Storage temperature range 910 Tstg Conditions mW -50 to 125 ℃ *1 Ambient temperature reduces a permission loss by 9.10mW per case more than 25 degree Celsius, 1degree Celsius. Condition: Assembly on the Epoxy-Glass (50x58x1.75mm) ●Recommended Operating Conditions Parameter Symbol Rating Unit Min Typ Max VDD 2.7 3.0 3.6 V Digital power-supply voltage DVDD 1.62 1.80 1.98 V Operating temperature range Topr -20 25 85 ℃ Power-supply voltage Conditions DVDD_EXT = H ●Electrical Characteristics At Ta = 25℃, VDD = 3.0V, unless otherwise noted. Parameter Low-level input voltage High-level input voltage Low-level output voltage High-level output voltage Standby current Sleep current1 Sleep current2 Operating current Clock frequency Symbol VIL VIH VOL VOH Ist Icc1 Icc2 Idd Freq Min VSS-0.5 0.8xVDD VDD-0.4 15 Rating Typ 60 10 4 20 Max 0.2xVDD VDD+0.5 VSS+0.4 5 100 20 8 24 Unit V V V V uA uA uA mA MHz Conditions RSTB=L DVDD_EXT=L DVDD_EXT=H (*1) No load *1 The supply of digital power (1.8V) is needed from the terminal DVDD. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 6/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet BU21021GUL ●HOST-I/F timing specification (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. After address 0x5F is accessed, it is not changed. t1 t6 t7 CSB t2 t3 t4 t5 t8 t9 SCK SI write WA6 WA5 WA4 WA3 WA2 WA1 WA0 WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0 WD7 WD6 W/R SI read Register address Write (WA) Write (WA + 1) WD1 WD0 Write (WA + n) RA6 RA5 RA4 RA3 RA2 RA1 RA0 W/R SO read Register address HiZ RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 RD7 RD6 Read (RA) Read (RA + 1) RD1 RD0 RD7 HiZ Read (RA + n) Figure 5. Timing specification (4-wire SPI) Table 1. Timing Requirements: 4-wire SPI at VDD = 3.0V, Ta = 25℃ Rating Parameter Symbol Min Typ Max Unit CSB setup time t1 30 - - ns ‘H’ width of SCK t2 30 - - ns ‘L’ width of SCK t3 30 - - ns SI setup time t4 20 - - ns SI holding time t5 20 - - ns CSB holding time t6 20 - - ns ‘H’ width of CSB t7 50 - - ns SO output delay time t8 - - 15 ns SCK frequency t9 - - 15 MHz www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 7/10 Conditions TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet 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. After address 0x5F is accessed, it is not changed. This 2-wire serial I/F is not corresponded to re-start 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” SEL_CSB = “H” : Slave Address = B8h ( 7bit = 5Ch + W/R bit ) : 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℃ Rating Parameter Symbol Min Typ SCL clock frequency fSCL START hold time "L" width of SCL Unit Max 0 - 400 kHz tHD:STA 0.6 - - us tLOW 1.3 - - us "H" width of SCL tHIGH 0.6 - - us Data hold time tHD:DAT 0.1 - - us Data setup time tSU:DAT 0.1 - - us STOP setup time tSU:STO 0.6 - - us Condition ・Write Protocol S SLAVE ADDRESS W A 7bit = 5Ch or 5Dh REGISTER ADDRESS WRITE DATA A 8bit A P 8bit ・Read Protocol S SLAVE ADDRESS W A 7bit = 5Ch or 5Dh REGISTER ADDRESS A P 8bit S SLAVE ADDRESS R A 7bit = 5Ch or 5Dh from Master to Slave S : START condition from Slave to Master P : STOP condition READ DATA N P 8bit 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 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet 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) Option(*2) For reject and reduce the noise from touch screen / LCD module or wiring. 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) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet BU21021GUL ●Ordering Information B U 2 1 0 2 1 Part Number G U L - E 2 Package Tape and Reel information GUL: VCSP50L2 E2: Embossed carrier tape ●Physical Dimension Tape and Reel Information <Tape and Reel information> Tape Embossed carrier tape Quantity 3000pcs Direction of feed E2 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 1pin Reel ) Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. ●Marking Diagram(TOP VIEW) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/10 TSZ02201-0Y1Y0F300060-1-2 19.Jun.2012 Rev.001 Datasheet Notice ●General Precaution 1) Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, 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 subject to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the latest information with a ROHM sales representative. ●Precaution on using ROHM Products 1) Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). 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Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7) De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8) Confirm that operation temperature is within the specified range described in the product specification. 9) ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Notice - Rev.003 © 2012 ROHM Co., Ltd. All rights reserved. Datasheet ●Precaution for Mounting / Circuit board design 1) When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue 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. 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