MK715R 查看數據表（PDF） - Integrated Circuit Systems

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MK715R

Touch Screen Controller

Integrated Circuit Systems 

MK715

Analog to Digital Converter Operation with a Touchscreen

The 10-bit ADC converts X and Y co-ordinates at a rate determined by register 1. 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. 1023) 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 511. 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 up to 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.

XH

MK715

Full

Scale

(1023)

Board and Wire

Interconnect

Screen

Interconnect

YL

Screen

X

Coordinate

Screen

Interconnect

XL

Board and Wire

Interconnect

15

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