Datasheet 4-wire Resistive Touch Screen Controller BU21029GUL General Description Key Specifications Unlike most resistive touch screen controllers, the Power supply voltage 1.65 V 3.60 V BU21029GUL 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 VCSP50L2 2.00 mm x 2.00 mm x 0.55(max) 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 VDD Host IO VDD 1.0uF 0.1uF 1.0uF Regulator option(*1) 10ohm XP RSTB Y+ 1.0nF 10ohm XN SCL 1.0nF 10ohm YP Panel ADC Host SDA X- X+ Host 1.0nF I/F BU210(10bit) 29GUL I/F 10ohm ( GPIO port ) YN INT 1.0nF Y- option(*2) 4-wire AUX resistive AD0 touch TVS diode AD1 screen option(*3) Clock OSC generator Option(*1) For Noise protection Option(*2) Please connect to VDD, when use as slave address =41. Option(*3) For ESD protection. Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.co.jp TSZ02201-0Y1Y0F300120-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/26 TSZ22111 14 001 11.Nov.2013 Rev.002DatasheetDatasheet BU21029GUL Pin Configuration Pin Description Top View Pin Pin Equivalent 1 2 3 4 I/O Description No Name circuit YP I/O YP channel input D A1 YP XN YN AD0 A A2 XN I/O XN channel input D A3 YN I/O YN channel input D XP PGND AD1 SDA B AD0 I Slave address input bit0 A A4 B1 XP I/O XP channel input D PVDD AUX RSTB SCL C B2 PGND - Ground for touch screen drivers - B3 AD1 I Test input(*1) A D VREF GND VDD INT SDA I/O Serial data(*2) C B4 Power supply for touch screen PVDD - - C1 drivers. AUX I Auxiliary channel input D C2 C3 RSTB I System reset(*3) A C4 SCL I Serial clock(*2) C Regulator output for control D1 VREF - - logic.(*4) D2 GND - Ground - VDD - Power supply - D3 Interrupt output. Pin polarity with INT O B D4 active low. (*1) Connect AD1 to GND. (*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 TSZ02201-0Y1Y0F300120-1-2 2011 ROHM Co., Ltd. All rights reserved. 2/26 TSZ2211115001 11.Nov.2013 Rev.002