Datasheet Resistive Type Touch Screen Controller ICs BU21023GUL BU21023MUV General Description Packages W(Typ) x D(Typ) x H(Max) Unlike most resistive touch screen controllers, the VCSP50L2 2.60mm x 2.60mm x 0.55mm BU21023 4-wire resistive touch screen controller VQFN028V5050 5.00mm x 5.00mm x 1.00mm enables dual-touch detection and gesture recognition. These intelligent controllers expose a set of registers to a HOST processor and are configured through software. 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 screen development which reduces development cost, and results in faster time to market across a family of products. VCSP50L2 VQFN028V5050 Features Applications Enables single touch, dual touch & gesture Products with an LCD can benefit from pan and recognition using standard 4-wire resistive touch zoom operations. screens Smart phones, Digital Cameras, Video Cameras, Adjustable touch detection threshold allows fine GPS Receivers, Printers, tuning of pressure sensitivity for an application Copiers, automotive navigation screens, touch Enables measurement of single point touch kiosks pressure Tablet PCs , Notebook PCs, LCD displays (with SPI- and 2-wire serial interface for interfacing to USB interface) HOST processor Programmable interrupt polarity 10-bit ADC provides sufficient resolution for finger or stylus inputs Firmware for internal CPU may be downloaded from HOST processor or from an EEPROM Includes filtering options to eliminate false coordinates Built in support for intelligent calibration Easy to swap X & Y coordinates or adapt to different touch screen connections Single 3V power supply Available in small packages and temperature ranges Ideally suited for consumer Key Specifications and Lineup Parameter BU21023GUL BU21023MUV 4-wire resistive 4-wire resistive Screen touch screen touch screen Maximum Detection Point 2 2 Integrated Filter Process Yes Yes Gesture Detection Yes Yes Supplied Voltage Range(V) 2.7 to 3.6 2.7 to 3.6 Temperature Range(C) -20 to +85 -20 to +85 4-wire SPI 4-wire SPI Host I/F 2-wire serial 2-wire serial Package VCSP50L2 VQFN028V5050 Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0L5L0F300840-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/17 TSZ2211114001 7.June.2016 Rev.004 BU21023GUL BU21023MUV BU21024FV-M Pin Configuration and Pin Description BU21023GUL T4 PVDD DVDD VDD VSS ECL EDA SCL SCK SDA SI INT A E XP AVDD DVDD EXT CLK EXT YN SEL CSB SO T3 IFSEL B D XN YP RSTB T1 T2 XN YP RSTB T1 T2 C C YN SEL CSB SO T3 IFSEL XP AVDD DVDD EXT CLK EXT D B ECL EDA SCL SCK SDA SI INT T4 PVDD DVDD VDD VSS E A 1 2 3 4 5 1 2 3 4 5 TOP VIEW (BALL SIDE DOWN) BOTTOM VIEW (BALL SIDE UP) No. Pin Name I/O Function Figure D1 YN I/O Screen interface E C1 XN I/O Screen interface E C2 YP I/O Screen interface E B1 XP I/O Screen interface E A1 T4 I/O Test pin E A2 PVDD O Regulator output (for supply screen voltage) - B3 AVDD O Regulator output (for supply analog block) - A3 DVDD I/O Regulator output (for supply digital block) or supply digital voltage - B4 DVDD EXT I Digital voltage enable (H=Hi-z , L=DVDD Enable) E A4 VDD - Supply voltage - A5 VSS - Ground - C3 RSTB I H/W reset 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 Interface select pin (L=SPI, H=2-wire serial) A D3 SO O SPI Serial data output 2-wire - F E5 INT O Interrupt output C D2 SEL CSB I SPI Chip select 2-wire Slave address select C E4 SDA SI I/O SPI Serial data input 2-wire Serial data in-out C E3 SCL SCK I SPI Serial clock input 2-wire Serial clock input C E2 EDA I/O EEPROM SDA C E1 ECL O EEPROM SCL C 1. Please use 1 .0 F capacitors between AVDD and DVDD to GND, and leave PVDD terminal open. 2. If DVDD EXT=H, the DVDD pin can be connected to an external 1.8V power source. 3. 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 0.1 F capacitor between T4 and GND. T1, T2 & T3 pins should be connected to GND. 4. When using the 2 wire serial interface, please pull up the SCL SCK, SDA SI pins via 10k ohms and leave SO unconnected. 5. Please note that the values of resistors and capacitors mentioned here are only recommended values. 6. RSTB should be held low until supply voltage VDD has ramped up and has reached a stable level. 7. The polarity of INT pin is programmable via register 0x30. 8. Connect CLK EXT to GND for normal use. 9. INT terminal is used as input pin in test mode. www.rohm.com TSZ02201-0L5L0F300840-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/17 TSZ2211115001 7.June.2016 Rev.004