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

零件编号

产品描述 (功能)

生产厂家

MK715R

Touch Screen Controller

Integrated Circuit Systems 

Recommended Circuit

From

Microprocessor

32.768 kHz

Crystal

Analog Voltage

+ 3.3V or +5V

1mF

0.01mF

0.01mF

DI

D0

CS

SK

X2

X1

PL

GP

VDD

CAP3

TOUCH#

INT

CLKOUT

XH

XL

YH

YL

GND CAP2 CAP1

470 pF

100kW 0.01mF

MK715

To Power Management

To Interrupt Controller

To Microcontroller

To Touch

Screen

All 0.01mF

The capacitors connected to CAP1 and CAP3 must be low leakage, ceramic type capacitors.

Pen Bounce

When the screen is untouched, the Y plate is driven high and the X plate is driven low. When the screen is touched, the

X plate is pulled high, which is detected by the MK715. This initiates a conversion, as long as conversions at rate

(ENCONR) are enabled. Some de-bounce is provided by the time constant of the screen decoupling capacitors

combined with the screen resistance. However, once conversions have started, pen bounce will not be detected until

after the current X or Y points have been taken.

If the pen is lifted during a conversion, this will also not be detected until the conversion is complete.

13

Share Link: