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MK712

Part Number	MK712
Manufacturer	Integrated Circuit Systems
Description	Touch Screen Controller
Published	May 7, 2005
Detailed Description	I C R O C LOC K Description The MK712 Touch Screen Controller IC provides all the screen drive, A to D converter and con...
Datasheet	MK712 PDF File

Overview

I C R O C LOC K 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.
MK712 Touch Screen Controller Features • Fully integrated, lowest power solution • Low standby current of 0.
5µA (typical) at 5.
0V • Active current while converting less than 10 mA • Resolves 350 dots/inch on 10.
5” display • Maximum speed of 197 points/second • Ratiometric conversion may eliminate screen calibration • Automatically wakes up and goes back to standby • 3.
3V or 5V 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 • See the MK715 for a serial interface Block Diagram D0-D7 A0-A2 CS RD WR 8 3 REGISTERS STATUS LOW STATUS HIGH X-LOW X-HIGH Y-LOW Y-HIGH CONTROL RATE 0 1 2 3 4 5 6 7 Pin Assignment NC INT TOUCH VDD VDD XH XL YH YL GND GND WR RD CS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 D0 D1 D2 D3 D4 D5 VDD GND D6 D7 CLKIN A0 A1 A2 CLKIN (14.
318 MHz) INT TOUCH 12 Bit A/D, Screen Driver and Controller XH XL YH YL MDS 712 I 1 Revision 100899 Printed 11/16/00 Integrated Circuit Systems, Inc.
•525 Race St.
•San Jose•CA•95126•(408)295-9800tel•www.
icst.
com I C R O C LOC K Pin Descriptions Number 1 2 3 4 5 6 7 8 9...

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