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MK712RI Datasheet(PDF) 1 Page - Integrated Device Technology |
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MK712RI Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 21 page  DATASHEET TOUCH SCREEN CONTROLLER MK712 IDT™ / ICS™ TOUCH SCREEN CONTROLLER 1 MK712 REV L 070805 Description The MK712 Touch Screen Controller IC provides all the screen drive, A to D converter and control circuits to easily interface to 4-wire analog resistive touch screens. The IC continually monitors the screen waiting for a touch. In this mode, the supply current is typically 0.5µA. When the screen is touched, the IC performs analog to digital conversions to determine the location of the touch, stores the X and Y locations in the registers, and issues an interrupt. This process is repeated up to 197 times per second until no further screen touches are detected, at which time the low current mode is resumed. Block Diagram Features • Packaged in 28-pin SSOP (150 mil) or 28-pin SOIC (300 mil) • Industrial (-30°C to +70°C) and commercial (0 to +70°C) and automotive (-35°C to +85°C) temperature ranges • Available in Pb (lead) free • Fully integrated, lowest power solution • Low standby current of 0.5µA (typical) at 5.0 V • Active current while converting less than 10 mA • Resolves 350 dots/inch on 10.5” display • Maximum speed of 197 points/second • Ratio metric conversion may eliminate screen calibration • Automatically wakes up and goes back to standby • 3.3 V or 5 V supply • 12 bit A/D converter • Simplifies the writing of software for touch screens • Extended temperature range available • Capacitors are the only external components required • Touch screen is directly driven - no external transistors are required • Programmable conversion rate • A to D Converter is monotonic • Parallel interface Pin Assignment 18 7 17 8 16 9 15 XL 10 YH 11 YL 12 GND 13 GND 14 GND D6 D7 CLKIN WR A0 A2 RD A1 22 21 20 19 CS VDD 5 6 VDD XH D5 24 23 D4 3 4 TOUCH VDD D3 26 25 D2 1 2 NC INT D1 28 27 D0 |
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