Datasheet Resistive Type Touch Screen Controller ICs BU21024FV-M General Description Packages Unlike most resistive touch screen controllers, the W(Typ) x D(Typ) x H(Max) BU21024 4-wire resistive touch screen controller SSOP-B28 10.0mm x 7.60mm x 1.35mm 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. Features Enables single touch, dual touch & gesture Applications recognition using standard 4-wire resistive touch screens Products with an LCD can benefit from pan and Adjustable touch detection threshold allows fine zoom operations. tuning of pressure sensitivity for an application Smart phones, Digital Cameras, Video Cameras, Enables measurement of single point touch GPS Receivers, Printers, pressure Copiers, automotive navigation screens, touch 2 SPI- and I C interface for interfacing to HOST kiosks processor Tablet PCs , Notebook computers, LCD displays Programmable interrupt polarity (with USB interface) 10-bit ADC provides sufficient resolution for finger Car navigation system, Car Audio 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 large volume automotive, consumer, and industrial applications AEC-Q100 Qualified Key Specifications and Lineup Parameter BU21024FV-M 4-wire resistive Screen touch screens Maximum Detection Point 2 Integrated Filter Process Yes Gesture Detection Yes Supplied Voltage Range(V) 2.7 to 3.6 Temperature Range(C) -40 to +85 4-wire SPI Host I/F 2-wire serial Pakage SSOP-B28 Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0L5L0F300190-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/16 TSZ2211114001 31.Mar.2014 Rev.003DatasheetDatasheet BU21023GUL BU21023MUV BU21024FV-M BU21024FV-M Pin Configuration and Pin Description TOP VIEW No. Pin Name I/O Function Figure 1 EDA I/O EEPROM SDA C 2 ECL O EEPROM SCL C 3 YNM I/O Screen interface (Test input) E 4 XNM I/O Screen interface (Test input) E 5 YPM I/O Screen interface (Test input) E 6 XPM I/O Screen interface (Test input) E 7 YN I/O Screen interface E 8 XN I/O Screen interface E 9 YP I/O Screen interface E 10 XP I/O Screen interface E 11 T4 I/O Test pin E 12 PVDD O Regulator output (for supply screen voltage) - 13 AVDD O Regulator output (for supply analog block) - 14 DVDD I/O Regulator output (for supply digital block) or supply digital voltage - 15 DVDD EXT I Digital voltage enable (H=Hi-Z , L=DVDD enable) E 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 Interface select pin (L=SPI, H=2-wire serial) A 24 SO O SPI Serial data output 2-wire - F 25 INT O Interrupt output C 26 SEL CSB I SPI Chip select 2-wire Slave address select C 27 SDA SI I/O SPI Serial data input 2-wire Serial data in-out C 28 SCL SCK I SPI Serial clock input 2-wire Serial clock input C 1. Please use 1.0F 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 0.1F 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. Please leave the XPM, XNM, YPM, YNM terminals open if they are not being used. 10. INT terminal is used as input pin in test mode. www.rohm.com TSZ02201-0L5L0F300190-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/16 TSZ2211115001 31.Mar.2014 Rev.003 EDA SCL SCK 1 28 ECL 2 27 SDA SI YNM 3 26 SEL CSB XNM 4 25 INT YPM 5 24 SO XPM 6 23 IFSEL YN 7 22 T3 XN 8 21 T2 YP 9 20 T1 XP 10 19 CLK EXT T4 11 18 RSTB PVDD 12 17 VSS AVDD 13 16 VDD DVDD 14 15 DVDD EXT TOP VIEW