MAX11800MAX11803 19-4711 Rev 3 10/10 Low-Power, Ultra-Small Resistive 2 Touch-Screen Controllers with I C/SPI Interface General Description Features The MAX11800MAX11803 low-power touch-screen con- 4-Wire Touch-Screen Interface trollers operate from a single supply of 1.70V to 3.6V, tar- X/Y Coordinate and Touch Pressure Measurement geting power-sensitive applications such as handheld Ratiometric Measurement equipment. The devices contain a 12-bit SAR ADC and a multiplexer to interface with a resistive touch-screen 12-Bit SAR ADC panel. A digital serial interface provides communications. Single 1.7V to 3.6V Supply The MAX11800MAX11803 include digital preprocessing Two Operating ModesDirect and Autonomous of the touch-screen measurements, reducing bus loading Data Tagging Provides Measurement and Touch and application-processor resource requirements. The Event Information included smart interrupt function generator greatly reduces the frequency of interrupt servicing to the Data Filtering Provides Noise Reduction devices. The MAX11800MAX11803 enter low-power Aperture Mode Provides Spatial Filtering modes automatically between conversions to save power, Digital Processing Reduces Bus Activity and making the devices ideal for portable applications. Interrupt Generation The MAX11800/MAX11801 offer two modes of operation: Programmable Touch-Detect Pullup Resistors direct and autonomous. Direct mode allows the applica- tion processor to control all touch-screen controller activ- Auto Power-Down Control for Low-Power ity. Autonomous mode allows the MAX11800/MAX11801 Operation to control touch-screen activity, thereby freeing the 25MHz SPI Interface (MAX11800/MAX11802) application processor to perform other functions. In 2 400kHz I C Interface (MAX11801/MAX11803) autonomous mode, the devices periodically scan the touch screen for touch events without requiring host- 1.6mm x 2.1mm, 12-Pin WLP and 4mm x 4mm, processor intervention. This can be used to reduce sys- 12-Pin TQFN tem power consumption. An on-chip FIFO is used during Low-Power Operation autonomous mode to store results, increasing effective 343W at V = 1.7V, 34.4ksps DD data throughput and lower system power. 888W at V = 3.3V, 34.4ksps DD The MAX11800MAX11803 support data-tagging, ESD Protection which records the type of measurement performed X, 4kV HBM Y, Z1, or Z2, and the type of touch event initial touch, 8kV HBM (X+, X-, Y+, Y-) continuing touch, or touch release. 1kV CDM The MAX11800/MAX11802 support the SPI serial bus. 200V MM 2 The MAX11801/MAX11803 support the I C serial bus. Ordering Information The MAX11800MAX11803 are available in 12-pin TQFN and 12-pin WLP packages, and are specified over the PART TEMP RANGE PIN-PACKAGE -40C to +85C (extended) and -40C to +105C (auto- MAX11800ETC+ -40C to +85C 12 TQFN-EP* motive) temperature ranges. MAX11800GTC/V+ -40C to +105C 12 TQFN-EP* Applications MAX11800EWC+T -40C to +85C 12 WLP Mobile Communication POS Terminals MAX11801ETC+ -40C to +85C 12 TQFN-EP* Devices MAX11801GTC/V+ -40C to +105C 12 TQFN-EP* Handheld Games MAX11801EWC+T -40C to +85C 12 WLP PDAs, GPS Receivers, Automotive Center Personal Navigation MAX11802ETC+ -40C to +85C 12 TQFN-EP* Consoles Devices, Media Players MAX11802EWC+T -40C to +85C 12 WLP Portable Instruments MAX11803ETC+ -40C to +85C 12 TQFN-EP* MAX11803EWC+T -40C to +85C 12 WLP Typical Operating Circuits and Pin Configurations appear +Denotes a lead(Pb)-free/RoHS-compliant package. at end of data sheet. /V denotes an automotive qualified part. T = Tape and reel. SPI is a trademark of Motorola, Inc. *EP = Exposed pad. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLELow-Power, Ultra-Small Resistive Touch-Screen 2 Controllers with I C/SPI Interface TABLE OF CONTENTS Absolute Maximum Ratings 8 Electrical Characteristics 8 2 I C Timing Characteristics .9 SPI Timing Characteristics 10 Typical Operating Characteristics 12 Pin Description .14 Functional Diagrams 15 Detailed Description .16 Position Measurements 16 Pressure Measurements .19 Touch-Detect Modes and Options .20 PUR and PUF 21 Idle Modes 21 Features Available in the MAX11800MAX11803 Averaging Modes .21 Combined Commands .23 Data Tagging 23 Low-Power Modes 23 Features Available in the MAX11800/MAX11801 Only 24 Autonomous Mode .24 Aperture 24 Panel Setup, Measurement, and Scan Commands .24 Direct Conversion Mode Operations 24 Interrupt Modes 24 Panel Setup Commands .27 Panel Measurement Commands .27 Combined Commands .28 Auxiliary Measurement Command 28 Autonomous Conversion Mode 31 Measurement Operations 32 Combined Commands .32 Delayed Touch Detection During Mode Transitions .33 FIFO Memory 33 Clearing FIFO 33 FIFO Data Block Readback Structure .33 FIFO Data Word Structure 34 Block Readback Operations .34 Clearing Interrupt .34 Aperture Modes and Options 34 Aperture Range Requirements .34 FIFO Aperture Criteria 35 Applications Information .35 Using Aperture Mode .35 2 MAX11800MAX11803