Datasheet 4-wire Resistive Touch Screen Controller BU21025GUL General Description Key Specifications BU21025GUL is a low power 4-wire resistive touch Power supply voltage 1.65V to 3.60V screen controller. BU21025GUL measures coordinates Temperature range -30 to 85 and touch pressures with a 12bit A/D converter. Standby current 0.8uA (Max.) BU21025GUL has a digital filter for noise reduction. Operating current 120uA (Typ.) Coordinate resolution 12Bits Features 4-wire resistive touch screen controller Package W (Typ.) x D (Typ.) x H (Max.) Single 1.65V to 3.60V supply. VCSP50L2 2.00 mm x 1.50 mm x 0.55mm Low standby current ( 0.8uA max) 12bit SAR A/D converter Applications 2-wire serial interface Equipment with a built in user interface of 4-wire Command base interface resistive touch screen Digital filter Portable device such as smart phone, tablet, PDA. Touch pressure measurement Digital still camera, digital video camera, portable Auto power down control TV. Built-in clock oscillation circuit PC / PC peripheral equipment such as laptop PC, touch screen monitor, printer. Typical Application Circuit VDD 3 1.0F 0.1F 2 2.2k 2.2k GND Master ( 2-wire serial interface ) Auxilary Input AUX SDA SDA 10 XP SCL SCL 0.1F 10 YP INT GPIO 0.1F BU21025 10 XN AD1 0.1F Touch YN AD0 Screen 10 1 0.1F 5 GND GND GND 4 1. 4-wire resistive touch screen 2. Pull-up resistor for 2-wire serial interface 3. Bypass capacitors 4. Diodes for EDS protection 5. Low pass filter for noise reduction Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays . www.rohm.com TSZ02201-0Y2Y0F300050-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/15 TSZ221 1114001 7.AUG.2012 Rev.002 GND VDDDatasheetDatasheet BU21025GUL Pin Configurations Pin Descriptions PIN NO. NAME I/O DESCRIPTION A1 XP I/O Screen interface A2 YP I/O Screen interface A3 XN I/O Screen interface A4 YN I/O Screen interface B1 VDD - Power supply B2 AD0 I Slave address bit0 input B3 AD1 I Slave address bit1 input B4 GND - Ground C1 AUX I Auxiliary input C2 INT O Interrupt output. Pin polarity is active low. C3 SDA I/O Serial data C4 SCL I/O Serial clock Absolute Maximum Ratings PARAMETER SYMBOL RATING UNIT CONDITION Power supply voltage VDD -0.3 to 4.5 V Input voltage VIN -0.3 to VDD+0.3 V Power dissipation Pd 600 mW (*1) Storage temperature range Tstg -50 to 125 (*1) Ambient temperature reduces a permission loss by 6.00mW per case more than 25 degree Celsius, 1degree Celsius. Recommended Operating Ratings RATING PARAMETER SYMBOL UNIT CONDITION MIN. TYP. MAX. Power supply voltage VDD 1.65 3.00 3.60 V Topr -30 25 85 Operating temperature range Electrical Characteristics All specifications typical at 25, VDD = 3.00V, GND=0.00V unless otherwise noted. RATING PARAMETER SYMBOL UNIT CONDITION MIN. TYP. MAX. Low-level input voltage VIL -0.3 - 0.3xVDD V High-level input voltage VIH 0.7xVDD - VDD+0.3 V Low-level output voltage VOL 0 - 0.2 V IL = 3.6mA High-level output voltage VOH VDD-0.2 - VDD V IL = -3.6mA A/D converter resolution AD - - 12 Bits Programmable 8/12 bits Differential non-linearity error DNL -3.5 - 3.5 LSB Integral non-linearity error INL -5 - 5 LSB Internal clock frequency Freq 2.6 4.0 5.1 MHz Active current Idd - 120 450 uA 8.2kSPS (operation ) Standby current Ist - - 0.8 uA After reset releasing www.rohm.com TSZ02201-0Y2Y0F300050-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/15 TSZ2211115001 7.AUG.2012 Rev.002