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MK712RI Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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MK712RI Datasheet(HTML) 9 Page - Integrated Circuit Systems |
9 / 16 page MK712 Touch Screen Controller MDS 712 I 9 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 XH XL YL MK712 FULL SCALE (4095) X CO-ORDINATE BOARD AND WIRE INTERCONNECT SCREEN INTERCONNECT SCREEN SCREEN INTERCONNECT BOARD AND WIRE INTERCONNECT Analog to Digital Converter Operation The 12-bit ADC converts X and Y co-ordinates at a rate determined by registers 6 and 7. The converter uses a ratiometric technique to give absolute co-ordinates on the screen, largely independent of variations in screen resistance, temperature or power supply voltage. The total voltage applied across the screen is defined as full-scale for the converter (i.e. 4095) and any point touched on the screen is proportional to this. For example, if the screen is touched exactly in the center, the converter will read 2047. This feature may allow for the elimination of calibration upon startup. However, the full scale voltage is defined at the IC pins and so any parasitic interconnect resistance will be included in full scale. In addition, the interconnect resistances on the screen also account for about 20% of the total resistance. This means that approximately the bottom 10% and top 10% of full scale are inaccessible. The converter is guaranteed to be monotonic, with no missing codes. |
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