Datasheet 4-wire Resistive Touch Screen Controller BU21029MUV General Description Key Specifications Unlike most resistive touch screen controllers, the Power supply voltage 1.65 V 3.60 V BU21029MUV 4-wire resistive touch-screen controller Temperature range -20 85 can generate data that enables dual touch detection. Standby current 1.0 uA (Max.) The Host processor can use this data to detect single Sleep current 100 uA (Typ.) and dual point coordinates. Operating current 0.8 mA (Typ.) Features Coordinate resolution 12bit Single and dual touch detection for standard 4-wire resistive touch screens Package I2C-like interface for interfacing with the host VQFN020V4040 4.00 mm x 4.00 mm x 1.00 mm processor Applications 12-bit resolution Single 1.65V to 3.60V supply Equipment with built-in user interface for 4-wire resistive touch screen Power on reset Portable information equipment like smart phones, Auto power down control tablets, and PDAs Built-in clock oscillator circuit Audio-visual equipment like digital still cameras, digital video cameras, and portable TVs PCs or peripheral equipment like laptops, touch screen monitors, and printers Typical Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.co.jp TSZ02201-0Y1Y0F300110-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/26 TSZ22111 14 001 11.Nov.2013 Rev.004 PVDD VDD PGND 0.1uF 1.0uF DVDD . 1 0uF OUT GND VREF DVDD IN 2.2kohm 2.2kohmDatasheetDatasheet BU21029MUV Pin Configuration Pin Description Pin Pin Equivalent I/O Description No Name circuit 16 10 (N.C.) AD0 1 RSTB I System reset (*3) A AD1 17 9 XP 2 DVDD IN - Regulator input for control logic.(*4) - SDA 18 8 AUX 3 VDD - Power supply - SCL 19 7 PVDD 4 GND - Ground - INT 20 6 DVDD OUT 5 VREF - Regulator input for control logic.(*4) - 6 DVDD OUT - Regulator output for control logic.(*4) - Power supply for touch screen 7 PVDD - - drivers. 8 AUX I Auxiliary channel input D TOP VIEW (LEAD SIDE DOWN) 9 XP I/O XP channel input D 10(NC) - - - 11(NC) - - - 12 YP I/O YP channel input D 13XN I/OXN channel input D INT 20 6 DVDD OUT 14YN I/OYN channel input D SCL 19 7 PVDD 15 PGND - Ground for touch screen drivers - SDA 18 8 AUX 16 AD0 I Slave address input bit0 A AD1 17 9 XP 17 AD1 I Test input (*1) A AD0 16 10 (N.C.) 18SDA I/OSerial data (*2) C 19SCL I Serial clock (*2) C Interrupt output. Pin polarity with 20INT O B active low. (*1) Connect AD1 to GND. BOTTOM VIEW (LEAD SIDE UP) (*2) SCL and SDA need a pull-up resistor greater than 2.2k. (*3) Connect RSTB to VDD if it will not be controlled. (*4) Bypass VREF, DVDD IN, DVDD OUT to GND with a 1.0uF capacitor and do not connect to the supply. Equivalent Circuit PAD PAD Figure A. Figure B. PAD PAD Figure C. Figure D. www.rohm.co.jp TSZ02201-0Y1Y0F300110-1-2 2011 ROHM Co., Ltd. All rights reserved. 2/26 TSZ2211115001 11.Nov.2013 Rev.004 PGND 15 1 RSTB RSTB 1 15 PGND YN 14 2 DVDD IN DVDD IN 2 14 YN XN 13 3 VDD VDD 3 13 XN YP 12 4 GND GND 4 12 YP (N.C.) 11 5 VREF VREF 5 11 (N.C.)