Touch Screen Controller ICs Resistive Type Touch Screen Controller ICs BU21023GUL, BU21023MUV, BU21024FV-M No.11105EAT01 ●Description Unlike most resistive touch screen controllers, the BU21023/ BU21024 4-wire resistive touch screen controllers enable dual-touch detection and gesture recognition. These intelligent controllers expose a set of registers to a host processor and are software configurable. The controllers can detect single point coordinates, dual coordinates, pinch, spread, rotate left and rotate right gestures, enabling pan and zoom operations in applications that previously had to rely exclusively on capacitive touch technology. Resistive touch does not require custom panel development which reduces development cost and results in faster time to market across a family of products. ●Features 1) Enables single touch, dual touch & gesture recognition using standard 4-wire resistive touch panels 2) Adjustable touch detection threshold allows fine tuning of pressure sensitivity for an application 3) Enables measurement of single point touch pressure 2 4) SPI and I C like interface for interfacing to host processor 5) Programmable interrupt polarity 6) 10-bit ADC provides sufficient resolution for finger or stylus inputs 7) Firmware for internal CPU may be downloaded from Host processor or from an EEPROM 8) Includes filtering options to eliminate false coordinates 9) Built in support for intelligent calibration 10) Easy to swap X & Y coordinates or adapt to different touch panel connections 11) Single 3V power supply 12) Available in a range of small package sizes and temperature ranges 13) Ideally suited for large volume automotive, consumer and industrial applications ●Application ・Products with a LCD that can benefit from pan and zoom operations. ・Smart phones, Digital Cameras, Video Cameras, GPS Receivers, Printers, Copiers, automotive navigation panels, touch kiosks ・Tablet PCs , Notebook computers, LCD displays (with USB interface) ●Line up matrix Parameter BU21023GUL BU21023MUV BU21024FV-M 4-wire resistive touch screen 4-wire resistive touch screen 4-wire resistive touch screens Maximum detection point 2 2 2 Integrated Filter process Yes Yes Yes Gesture Detection Yes Yes Yes Supplied Voltage Range(V) 2.7 － 3.6 2.7 － 3.6 2.7 － 3.6 Temperature Range(℃) -20 － 85 -20 － 85 -40 － 85 Host I/F 4-wire SPI 2-wire serial 4-wire SPI 2-wire serial 4-wire SPI 2-wire serial PKG VCSP50L2 VQFN028V5050 SSOP-B28 Screen www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Absolute Maximum Ratings Parameter Symbol Ratings Unit Power supply voltage VDD -0.3 ～ 4.5 V Input voltage VIN VSS-0.3 ～ VDD+0.3 V BU21023GUL Power dissipation BU21023MUV Pd BU21024FV-M Storage temperature range *1 mW 704 *2 mW 850 *3 mW -50 ～ 125 ℃ 830 Tstg Condition *1 Derate by 7.04 mW /℃ centigrade when ambient temperature exceeds 25℃. Measured using Epoxy-Glass PCB measuring 50x58x1.75 mm *2 Derate by 8.30mW /℃ centigrade when ambient temperature exceeds 25℃. Measured using Epoxy-Glass PCB measuring 50x58x1.75mm *3 Derate by 8.50mW /℃ centigrade when ambient temperature exceeds 25℃. Measured using Epoxy-Glass PCB measuring 50x58x1.75mm ●Recommended Operating Conditions Parameter Power supply voltage Digital core power supply Operating temperature range BU21023GUL BU21023MUV Symbol Ratings Unit Min. Typ. Max. VDD 2.70 3.00 3.60 V DVDD 1.62 1.80 1.98 V -20 25 85 ℃ -40 25 85 ℃ Condition DVDD_EXT=H Topr BU21024FV-M Note: The BU21023/BU21024 controllers can be operated with a single 3V VDD supply. It is also possible to supply 1.8V DVDD from an external source if the DVDD_EXT pin is connected to logic high. ●Electrical Characteristics (Ta=25℃, VDD=3.00V) Parameter Symbol Limits Min. Typ. Max. Unit Condition Low-level input voltage VIL VSS-0.5 - 0.2×VDD V High-level input voltage VIH 0.8×VDD - 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 - - 1 µA RSTB=L Sleep current1 Icc1 - 60 100 µA DVDD_EXT=L Sleep current2 Icc2 - 10 20 µA DVDD_EXT=H Operating current Idd - 4 6 mA No load Freq 18 20 22 MHz Oscillation frequency Resolution Ad 1024×1024 Bit Differential non-linearity error DNL -3.0 - +3.0 LSB Integral non-linearity error INL -3.0 - +3.0 LSB www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●HOST-I/F mode (4-wire SPI) (SCK=SCL_SCK, SI=SDA_SI, CSB=SEL_CSB, SO=SO) Condition : VDD = 3.0V Ta=25℃ Parameter Symbol Limits Min. Typ. Max. Unit CSB setup time t1 30 - - ns SCK "H" level period t2 30 - - ns SCK "L" level period t3 30 - - ns SI setup time t4 20 - - ns SI holding time t5 20 - - ns CSB holding time t6 20 - - ns CSB "H" level time t7 50 - - ns Data output delay time t8 - - 15 ns SCK frequency t9 - - 15 MHz Condition Note: SPI interface is selected by tying IFSEL pin to logic low. IFSEL= logic high selects the 2-wire interface www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●HOST-I/F mode (2-wire serial) (SCL=SCL_SCK, SDA=SDA_SI) 2 The 2-wire serial mode presents an I C like interface for all practical purposes, but it is not a complete implementation 2 2 conforming to the I C specification. The BU21023MUV/ BU21023GUL / BU21024FV-M devices can co-exist with other I C devices on the same bus. The slave address for 2-wire serial communication is 5Ch or 5Dh. This is determined by the SEL_CSB pin. SEL_CSB = “L” SEL_CSB = “H” : Slave address = 5Ch : Slave address = 5Dh tSU;STO tHD;STA SDA tSU;DAT tHD;DAT SCL SCL Address Data ACK Parameter Symbol ACK Data ACK Limits Unit Min. Typ. Max. fSCL 0 - 400 kHz tHD:STA 0.6 - - µs SCL “L” tLOW 1.3 - - µs SCL “H” tHIGH 0.6 - - µs Data hold time tHD:DAT 0.1 - - µs Data setup time tSU:DAT 0.1 - - µs STOP condition setup time tSU:STO 0.6 - - µs SCL clock frequency START condition hold time Condition ・Write protocol S SLAVE ADDRESS W A 7bit = 5Ch or 5Dh ・Read protocol S SLAVE ADDRESS 7bit = 5Ch or 5Dh REGISTER ADDRESS 8bit REGISTER ADDRESS 8bit from master to slave from slave to master W A www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. A WRITE DATA A P S SLAVE ADDRESS R A 8bit A S P R W A N 4/17 READ DATA N 7bit = 5Ch or 5Dh 8bit = START condition = STOP condition = data direction READ (SDA HIGH) = data direction WRITE (SDA LOW) = acknowledge (SDA LOW) = not acknowledge (SDA HIGH) 2011.08 - Rev.A P Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●EEPROM I/F BU21023/BU21024 controllers include an EEPROM interface for firmware download. Device address of EEPROM is set via register 0x51(EEPROM_ADDR). Timing chart tSU;STO tHD;STA SDA tSU;DAT tHD;DAT SCL Address Parameter Read /Write Data ACK Limits Symbol Unit Min. Typ. Max. fSCL 270 310 350 kHz tHD:STA 0.7 - 0.9 µs SCL ”L” width tLOW 1.4 - 1.8 µs SCL ”H” width tHIGH 1.4 - 1.8 µs Data hold time tHD:DAT 0.7 - 0.9 µs Data setup time tSU:DAT 0.7 - 0.9 µs STOP setup time tSU:STO 0.7 - 0.9 µs SCL clock frequency START hold time ACK Data ACK Condition Protocol *IC does not support the write command. *IC supports the following read command. Start S SLAVE ADDRESS WA 1st WORD ADDRESS A 2nd WORD ADDRESS A DATA(0) A DATA(n-3) A DATA(n-2) A DATA(n-1) A DATA(n) N P Stop www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Background Information A resistive touch panel is made up of a multilayer sandwich of resistive films and protective coatings all sitting on top of an LCD display. Resistive touch panels work by direct contact of a stylus or a finger flexing a pair of resistive films, hence any blunt pointing instrument or a gloved finger may be used. Touch panel resolution The resolution of a touch panel is typically measured in dots per inch (dpi) and is a function of the physical size of the touch panel and the ADC used in the conversion circuitry. For example, a 3”x5” panel used with the BU21023/BU21024 devices can provide a theoretical resolution of 1024 /5 = 204 dpi. In the case of resistive touch panels, the direct contact nature of its operation and finger thickness often impose an upper limit on the effective system resolution that may be achieved, regardless of the resolution of the ADC itself. ●Functional Description The BU21023/BU21024 devices connect to a standard 4-wire resistive touch screen on one side and to a host processor on the other side. The BU21024 includes four additional sense terminals allowing it to be used with either 4-wire or 8-wire resistive touch screens. The BU21023/BU21024 include the analog and digital circuitry to process and provide dual touch coordinate data and pinch, spread, rotate-right and rotate-left gesture information to the host CPU. The BU21023/BU21024 devices include an internal CPU and provide a high degree of programmability by exposing a set of 2 registers that can be accessed by a host CPU through SPI or I C like serial interfaces. The IFSEL pin determines whether 2 SPI or I C like interface is selected, The BU21023/BU21024 devices include an INT pin whose polarity can be programmed via registers. When an interrupt occurs, for example, due to touch detection, the host processor is required to read an interrupt status register to determine the cause of the interrupt and take appropriate action. The program memory of the internal CPU may be initialized via the host interface or via an external EEPROM. This is selected by a register setting. The BU21023/BU21024 devices support two sensing modes; continuous and interval sensing modes, that are register selectable. In the continuous sensing mode, the embedded CPU reads Z, X & Y coordinates continuously when a touch is detected. The interval sensing mode allows a delay to be inserted between each cycle. The continuous sensing mode is used more often though the interval sensing mode minimizes power consumption. The continuous sensing mode typically completes a sampling cycle consisting of Z, X & Y measurements in approximately 2.3 mS. The BU21023/BU21024 devices enable optimization of touch detection threshold for a given panel. They also include several sophisticated calibration algorithms. This document includes a description of the registers followed by flow charts that describe specific steps that a host processor must follow. Often, a flow chart requires other flow charts to explain the steps in finer detail. The document also includes information on touch screen parameters that one should to look for while selecting resistive touch panels for multi-touch. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Block Diagram / Description of each block 【BU21023GUL / BU21023MUV】 Work Memory XP XN YP ADC (10bit) Panel I/F CPU (8bit) YN EEPROM I/F ECL EDA Program Memory Filter SEL_CSB CLK_EXT Clock Generator OSC Register SCL_SCK Host I/F SDA_SI SO INT Regulator T4 T3 T2 T1 RSTB VSS VDD DVDD_EXT AVDD DVDD PVDD IFSEL Screen I/F 4-wire resistive touch screen interface ADC 10bit A/D converter OSC Internal 20MHz oscillator block with optional external clock input Regulator Internal regulator provides 1.8V DVDD supply. DVDD can also be supplied from an external source if DVDD_EXT pin is tied high. Clock Generator System clock and timing generation (10MHz CPU clock) CPU Core For dual touch processing, programmability and host interface Work memory Data memory for CPU Program Memory EEPROM I/F Host I/F Program memory for CPU. Code can be downloaded by host processor or from an external EEPROM To connect to external EEPROM if downloading program memory from EEPROM. Use of external EEPROM is optional. 4-wire SPI or 2-wire I2C like interface provides access to registers www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M 【BU21024FV-M】 Work memory XP XN EEPROM I/F ECL EDA YP YN XPM ADC (10bit) Panel I/F CPU (8bit) XNM Program memory Filter YPM YNM SEL_CSB Clock generator Osc CLK_EXT register SCL_SCK Host I/F SDA_SI SO INT Regulator T4 T3 T2 T1 RSTB VSS VDD DVDD DVDD_EXT AVDD PVDD IFSEL Screen I/F 4-wire or 8-wire resistive touch screen interface ADC 10bit A/D converter OSC Internal 20MHz oscillator block with optional external clock input Regulator Internal regulator provides 1.8V DVDD supply. DVDD can also be supplied from an external source if DVDD_EXT pin is tied high. Clock Generator System clock and timing generation (10MHz CPU clock) CPU Core For dual touch processing, programmability and host interface Work memory Data memory for CPU Program Memory EEPROM I/F Host I/F Program memory for CPU. Code can be downloaded by host processor or from an external EEPROM To connect to external EEPROM if downloading program memory from EEPROM. Use of external EEPROM is optional. 4-wire SPI or 2-wire I2C like interface provides access to registers www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Pin Description 【BU21023GUL】 No. Pin name 1. 2. 3. 4. 5. 6. 7. 8. I/O Function Fig. D1 YN I/O Panel interface E C1 XN I/O Panel interface E C2 YP I/O Panel interface E B1 XP I/O Panel interface E A1 T4 I/O Test pin E A2 PVDD O Regulator output (for supply panel voltage) - B3 AVDD O - A3 DVDD I/O B4 DVDD_EXT I Regulator output (for supply analog block) Regulator output (for supply digital block) or supply digital voltage (DVDD_EXT="H") Digital voltage enable (H=Hi-z , L=DVDD Enable) A4 VDD - Supply voltage - A5 VSS - Ground - C3 RSTB I H/W reset E E B5 CLK_EXT I Supply external clock for debug A C4 T1 I Test pin A C5 T2 I Test pin A D4 T3 I Test pin A D5 IFSEL I Intereface select pin (L=SPI, H=2wire serial) A D3 SO O SPI E5 INT O Interrupt output D2 SEL_CSB I SPI Chip select 2wire Slave address select C E4 SDA_SI I/O SPI Serial data input 2wire Serial data in-out C E3 SCL_SCK I SPI Serial clock input 2wire Serial clock input C E2 EDA I/O EEPROM SDA C E1 ECL O EEPROM SCL C Serila data output 2wire - F C Please use 1.0uF capacitors between AVDD and DVDD to GND, and leave PVDD terminal open. If DVDD_EXT=”H “, the DVDD pin can be connected to an external 1.8V power source. Please pull up the ECL, EDA, and INT pins using 10k ohm resistors as shown in the application diagram at the end of this document. ECL and EDA pins may be directly connected to GND if an external EEPROM is not being used. Please connect a 0.1uF capacitor between T4 and GND. T1, T2 & T3 pins should be connected to GND. When using the 2 wire serial interface, please pull up the SCL_SCK, SDA_SI pins via 10k ohms and leave SO unconnected. Please note that the values of resistors and capacitors mentioned here are only recommended values. RSTB should be held low until supply voltage VDD has ramped up and has reached a stable level. The polarity of INT pin is programmable via register 0x30 Connect CLK_EXT to GND for normal use T4 PVDD DVDD VDD VSS A ECL EDA SCL_SCK SDA_SI INT YN SEL_CSB SO T3 IFSEL XN YP RSTB T1 T2 AVDD DVDD_EXT CLK_EXT E XP AVDD DVDD_EXT CLK_EXT B D XN YP RSTB T1 T2 C C YN SEL_CSB SO T3 IFSEL XP D B ECL EDA SCL_SCK SDA_SI INT E T4 PVDD DVDD VDD VSS 1 2 3 4 5 A 1 2 3 4 5 TOP VIEW (BALL SIDE DOWN) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. BOTTOM VIEW (BALL SIDE UP) 9/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M 【BU21023MUV】 No. Pin name fig - - - 2 NC - - - 3 NC - 4 YN I/O 5 XN 6 YP 7 XP I/O 8 T4 9 PVDD 10 - - Panel interface E I/O Panel interface E I/O Panel interface E Panel interface E I/O Test pin E O Regulator output (for supply panel voltage) - AVDD O - 11 DVDD I/O 12 DVDD_EXT I Regulator output (for supply analog block) Regulator output (for supply digital block) or supply digital voltage (DVDD_EXT="H") Digital voltage enable (H=Hi-Z , L=DVDD enable) E 13 VDD - Supply voltage - 14 VSS - Ground - 15 RSTB I H/W reset E 16 CLK_EXT I Supply external clock for debug A 17 T1 I Test pin A 18 T2 I Test pin A 19 T3 I Test pin A 20 IFSEL I Intereface select pin (L=SPI, H=2wire serial) 21 SO O 22 INT O 23 SEL_CSB I SPI Chip select 2wire Slave address select C 24 SDA_SI I/O SPI Serial data input 2wire Serial data in-out C 25 SCL_SCK I SPI Serial clock input 2wire Serial clock input 26 EDA I/O EEPROM SDA 27 ECL O EEPROM SCL 28 NC - SPI Serila data output - A 2wire - F Interrupt output C C C C - - XN XP 7 YN 4 YP NC 3 6 NC 2 5 NC T1 17 1 T2 18 RSTB T3 19 15 IFSEL 20 16 CLK_EXT SO Please use 1.0uF capacitors between AVDD and DVDD to GND, and leave PVDD terminal open. If DVDD_EXT=”H “, the DVDD pin can be connected to an external 1.8V power source. Please pull up the ECL, EDA, and INT pins using 10k ohm resistors as shown in the application diagram at the end of this document. ECL and EDA pins may be directly connected to GND if an external EEPROM is not being used. Please connect a 0.1uF capacitor between T4 and GND. T1, T2 & T3 pins should be connected to GND. When using the 2 wire serial interface, please pull up the SCL_SCK, SDA_SI pins via 10k ohms and leave SO unconnected. Please note that the values of resistors and capacitors mentioned here are only recommended values. RSTB should be held low until supply voltage VDD has ramped up and has reached a stable level. The polarity of INT pin is programmable via register 0x30 Connect CLK_EXT to GND for normal use INT 22 14 VSS NC 28 8 T4 SEL_CSB 23 13 VDD ECL 27 9 PVDD www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15 NC TOP VIEW (LEAD SIDE DOWN) RSTB VSS 17 14 16 22 T1 INT CLK_EXT VDD T4 18 13 8 T2 23 28 19 SEL_CSB NC 20 DVDD_EXT T3 12 IFSEL 24 21 SDA_SI PVDD SO AVDD 9 7 10 27 6 26 ECL XP EDA YP DVDD 5 AVDD 11 4 10 25 XN 26 SCL_SCK YN EDA DVDD 3 DVDD_EXT 11 2 12 25 NC 24 NC SDA_SI SCL_SCK 1 4. 5. 6. 7. 8. Function NC 21 1. 2. 3. I/O 1 BOTTOM VIEW (LEAD SIDE UP) 10/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M 【BU21024FV-M】 No. Pin name fig I/O EEPROM SDA C 2 ECL O EEPROM SCL C 3 YNM I/O Panel interface (Test input) E 4 XNM I/O Panel interface (Test input) E 5 YPM I/O Panel interface (Test input) E 6 XPM I/O Panel interface (Test input) E 7 YN I/O Panel interface E 8 XN I/O Panel interface E 9 YP I/O Panel interface E 10 XP I/O Panel interface E 11 T4 I/O Test pin E 12 PVDD O Regulator output (for supply panel voltage) - 13 AVDD O - 14 DVDD I/O 15 DVDD_EXT I Regulator output (for supply analog block) Regulator output (for supply digital block) or supply digital voltage (DVDD_EXT="H") Digital voltage enable (H=Hi-Z , L=DVDD enable) 16 VDD - Supply voltage - 17 VSS - Ground - 18 RSTB I H/W reset E 19 CLK_EXT I Supply external clock for debug A 20 T1 I Test pin A 21 T2 I Test pin A 22 T3 I Test pin A 23 IFSEL I Intereface select pin (L=SPI, H=2wire serial) A SPI Serila data output 2wire - E 24 SO O 25 INT O 26 SEL_CSB I SPI Chip select 2wire Slave address select C 27 SDA_SI I/O SPI Serial data input 2wire Serial data in-out C SCL_SCK I SPI Serial clock input 2wire Serial clock input C Interrupt output F C DVDD_EXT TOP VIEW 15 14 DVDD VDD 16 13 AVDD VSS 17 12 PVDD RSTB 18 11 T4 CLK_EXT 19 10 XP T1 20 9 YP T2 21 8 XN T3 22 7 YN XPM IFSEL 6 YPM 23 5 XNM SO 25 4 YNM INT 26 3 24 27 2 ECL SEL_CSB 28 1 EDA SDA_SI Please use 1.0uF capacitors between AVDD and DVDD to GND, and leave PVDD terminal open. If DVDD_EXT=”H “, the DVDD pin can be connected to an external 1.8V power source. Please pull up the ECL, EDA, and INT pins using 10k ohm resistors as shown in the application diagram at the end of this document. ECL and EDA pins may be directly connected to GND if an external EEPROM is not being used. Please connect a 0.1uF capacitor between T4 and GND. T1, T2 & T3 pins should be connected to GND. When using the 2 wire serial interface, please pull up the SCL_SCK, SDA_SI pins via 10k ohms and leave SO unconnected. Please note that the values of resistors and capacitors mentioned here are only recommended values. RSTB should be held low until supply voltage VDD has ramped up and has reached a stable level. The polarity of INT pin is programmable via register 0x30 Connect CLK_EXT to GND for normal use Please leave the XPM, XNM, YPM, YNM terminals open if using a 4-wire touch screen. These pins should be connected to the reference leads of an 8-wire touch screen if one is being used. SCL_SCK 4. 5. 6. 7. 8. 9. Function EDA 28 1. 2. 3. I/O 1 TOP VIEW www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M PAD PAD Fig. B Fig. A PAD PAD Fig. D Fig. C PAD CIN Fig. E PAD Fig. F ●Fig. BU21023GUL / BU21023MUV / BU21024FV-M I/O equivalent circuit www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Application Circuit 【BU21023GUL/BU21023MUV】 BU21023GUL/MUV support 2 host interfaces (4-wire SPI and 2-wire serial bus). The figures below are shown application circuit when each interface is used. (Although BU21023GUL is CSP package, it is shown in similar figure for comparing.) *Please connect the terminal of ECL/EDA with VSS, when firmware is download form HOST. *Please insert TVS diode each sensor line from the perspective that enhances resistance to ESD. *In 4-wire SPI using case, pull up INT terminal to VDD or host IO voltage (max4.5V). If no using, connect to GND. VDD EEPROM VDD Host 10kohm 10kohm INT SEL_CSB SCL_SCK SDA_SI EDA ECL 10kohm SO (10kohm) IFSEL panel T3 YN T2 BU21023 XN T1 0.1uF VDD VSS VDD DVDD 1.0uF DVDD_EXT TVS diode AVDD RSTB PVDD EXT_CLK XP T4 YP 1.0uF Example 1 : BU21023GUL/MUV application circuit(4-wireSPI) In 2-wire serial interface using case, please pull up INT, SCL_SCK, SDA_SI terminal to VDD or host IO voltage(max4.5V). VDD EEPROM VDD Host 10kohm 10kohm 10kohm INT SEL_CSB SCL_SCK SDA_SI EDA ECL 10kohm 10kohm SO IFSEL panel T3 YN T2 BU21023 XN T1 0.1uF 1.0uF VSS VDD DVDD TVS diode DVDD_EXT RSTB AVDD XP PVDD EXT_CLK T4 YP VDD 1.0uF Example 2 : BU21023GUL/MUV application circuit(2-wire Serial bus) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M 【BU21024FV-M】 BU21024FV-M support 2 host interfaces (4-wire SPI and 2-wire serial bus). The figures below are shown Application Circuit when each interface is used. (Although BU21023GUL is CSP package, it is shown in similar figure for comparing.) *Please connect the terminal of ECL/EDA with VSS, when Firmware is download form HOST. *Please insert TVS diode each sensor line from the perspective that enhances resistance to ESD. *In 4-wire SPI using case, pull up INT terminal to VDD or host IO voltage(max4.5V). If no using, connect to GND. VDD VDD 10kohm VDD 10kohm 10kohm 1 EDA SCL_SCK 28 2 ECL SDA_SI 27 3 YNM SEL_CSB 26 4 XNM INT 25 5 YPM SO 24 6 XPM IFSEL 23 7 YN T3 22 8 XN T2 21 9 YP T1 20 10 XP CLK_EXT 19 11 T4 EEPROM Host (10kohm) BU21024FV-M panel RSTB 18 0.1uF TVS diode 12 PVDD VSS 17 13 AVDD VDD 16 14 DVDD DVDD_EXT 15 VDD 1.0uF 1.0uF Example 3 : BU21024FV-M Application Circuit(4-wireSPI) VDD 10kohm VDD VDD 10kohm 10kohm 1 EDA SCL_SCK 28 2 ECL SDA_SI 27 3 YNM SEL_CSB 26 4 XNM INT 25 5 YPM SO 24 6 XPM IFSEL 23 7 YN T3 22 8 XN T2 21 9 YP T1 20 10 XP CLK_EXT 19 11 T4 EEPROM BU21024FV-M Host VDD panel RSTB 18 0.1uF TVS diode 12 PVDD VSS 17 13 AVDD VDD 16 14 DVDD DVDD_EXT 15 VDD 1.0uF 1.0uF Example 4 : BU21024FV-M Application Circuit(2-wire Serial bus) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M BU21024FV-M has the other pins for debug except for 4-wire resistive touch screen interface (XP, YP, XN, YN). When debug, there are 4 monitor pins corresponding to four past terminals. (In 4-wire, supply and detect voltage of screen on 4 pins. When debug, if this function is enable, it is possible to supply voltage on past 4pins and detect voltage on 4 pins with **M separately. ) To remove the noise of Screen itself, the filter is composed of discrete circuit. It is possible to ease the decrease of screen voltage's dynamic range, which is caused by wiring resistance on the PCB. Note: These debug terminals are only for debug. So, please don’t use them in normal application using. VDD VDD 10kohm VDD 10kohm 10kohm 1 EDA SCL_SCK 28 2 ECL SDA_SI 27 3 YNM SEL_CSB 26 4 XNM INT 25 5 YPM SO 24 6 XPM IFSEL 23 7 YN T3 22 8 XN T2 21 9 YP T1 20 10 XP CLK_EXT 19 EEPROM Host 1nF 10 ohm 1nF 10 ohm (10kohm) 1nF 10 ohm 1nF BU21024FV-M panel 11 RSTB 18 T4 0.1uF TVS diode 12 PVDD VSS 17 13 AVDD VDD 16 14 DVDD DVDD_EXT 15 VDD 1.0uF 1.0uF Example 5 : BU21024FV-M Application Circuit(4-wireSPI with RC filter) VDD VDD 10kohm VDD 10kohm 10kohm 1 EDA SCL_SCK 28 2 ECL SDA_SI 27 3 YNM SEL_CSB 26 4 XNM INT 25 5 YPM SO 24 6 XPM IFSEL 23 7 YN T3 22 8 XN T2 21 9 YP T1 20 10 XP CLK_EXT 19 11 T4 EEPROM Host 10 ohm 1nF 10 ohm 1nF 10 ohm VDD 1nF 10 ohm 1nF BU21024FV-M panel RSTB 18 0.1uF TVS diode 12 PVDD VSS 17 13 AVDD VDD 16 14 DVDD DVDD_EXT 15 VDD 1.0uF 1.0uF Example 6 : BU21024FV-M Application Circuit(2-wire Serial bus with RC filter) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Notes for use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected. The electrical characteristics are guaranteed under the conditions of each parameter. (3) Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC's power supply terminal. (4) Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the GND line, give consideration to design the patterns in a similar manner. Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. (6) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. (7) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. (8) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. (9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. (11) External capacitor In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc. (12) Rush current The IC with some power supplies has a capable of rush current due to procedure and delay at power-on. Pay attention to the capacitance of the coupling condensers and the wiring pattern width and routing of the power supply and the GND lines. (13) Others In case of use this LSI, please peruse some other detail documents, we called, Technical note, Functional description, Application note. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/17 2011.08 - Rev.A Technical Note BU21023GUL,BU21023MUV,BU21024FV-M ●Ordering part number B U 2 Part No. 1 0 2 Part No. 21023 21024 4 F V - M Package GUL : VCSP50L2 MUV: VQFN028V5050 FV : SSOP-B28 E 2 Packaging and forming specification E2: Embossed tape and reel UCSP50L1 (BD82103GWL) <Tape and Reel information> 0.1±0.05 0.55MAX 1.5±0.05 1PIN MARK 1.8±0.05 11-φ0.2±0.05 A 0.05 A B (φ0.15)INDEX POST Embossed carrier tape Quantity 3000pcs Direction of feed S 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 ) 0.35±0.05 0.08 S Tape B C B 1 0.3±0.05 2 3 P=0.4×2 A 4 P=0.4×3 1pin Reel (Unit : mm) Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. VQFN028V5050 <Tape and Reel information> 5.0±0.1 5.0±0.1 1.0MAX Embossed carrier tape Quantity 2500pcs Direction of feed 1PIN MARK 2.7±0.1 C0.2 1 7 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 ) (0.22) 0.02 +0.03 -0.02 S 0.08 S 8 2.7±0.1 28 0.4±0.1 Tape 22 14 21 1.0 0.5 15 +0.05 0.25 -0.04 1pin Reel (Unit : mm) Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. SSOP-B28 <Tape and Reel information> 10 ± 0.2 (MAX 10.35 include BURR) 15 0.3Min. 1 Embossed carrier tape Quantity 2000pcs 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 ) 14 0.15 ± 0.1 0.1 1.15 ± 0.1 Tape Direction of feed 5.6 ± 0.2 7.6 ± 0.3 28 0.1 0.65 0.22 ± 0.1 1pin Reel (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/17 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2011.08 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. 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ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A