BU21026MUV Datasheet, PDF (2/23 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21026MUV
Contents
General Description ........................................................................................................................................................................1
Features.......................................................................................................................................................................................... 1
Applications ....................................................................................................................................................................................1
Key Specifications...........................................................................................................................................................................1
Package .......................................................................................................................................................................................... 1
Typical Application Circuit(s) ...........................................................................................................................................................1
Contents .........................................................................................................................................................................................2
Pin Configuration(s) ........................................................................................................................................................................3
Pin Description(s) ...........................................................................................................................................................................3
Equivalent circuit.............................................................................................................................................................................3
Block Diagram(s) ............................................................................................................................................................................4
Description of Block(s) ....................................................................................................................................................................4
Power on Reset...........................................................................................................................................................................4
A/D Converter .............................................................................................................................................................................4
Touch Screen I/F .........................................................................................................................................................................4
Touch Detection ..........................................................................................................................................................................5
Digital Filter .................................................................................................................................................................................5
Absolute Maximum Ratings ............................................................................................................................................................6
Thermal Resistance^{(Note 1)} ...............................................................................................................................................................6
Recommended Operating Conditions .............................................................................................................................................6
Electrical Characteristics.................................................................................................................................................................6
Power on Reset Timing Chart .........................................................................................................................................................7
2-wire Serial Interface Timing Chart................................................................................................................................................7
2-wire Serial Interface .....................................................................................................................................................................8
Start Condition.............................................................................................................................................................................8
Stop Condition.............................................................................................................................................................................8
Data Transfer ..............................................................................................................................................................................8
Acknowledge Bit (sending)..........................................................................................................................................................8
Acknowledge Bit (receiving) ........................................................................................................................................................8
Address Byte...............................................................................................................................................................................8
Command Byte ...........................................................................................................................................................................9
Write Protocol............................................................................................................................................................................ 11
Read Protocol ...........................................................................................................................................................................12
Operation ......................................................................................................................................................................................13
Position Detection of Touch Screen...........................................................................................................................................13
Touch Pressure Measurement ..................................................................................................................................................13
A/D Conversion Time ................................................................................................................................................................14
A/D Sampling Time with 2-wire Serial Interface ........................................................................................................................14
Operational Notes.........................................................................................................................................................................15
Ordering Information.....................................................................................................................................................................17
Marking Diagrams.........................................................................................................................................................................17
Physical Dimension, Tape and Reel Information...........................................................................................................................18
Revision History............................................................................................................................................................................19
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