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

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MK715R

Touch Screen Controller

Integrated Circuit Systems 

MK715

Using the General Purpose Inputs to the A to D Converter

The GP pin is a general purpose input to the 10 bit ADC. An on-chip 1.297 V reference is used, where 1.297 V is full

scale. In addition, when using a 4-wire touch screen, the PL pin is available as a general purpose input, or it can be

used as a power control for an external resistor divider:

Voltage to be

measured

Optional

Capacitor

MK715

SELGP

GP

SELPL

ADC

SELGP, SELPL, and

PLZERO are all register

bits.

PL

PLZERO

For two voltages, the connection is as follows:

Voltage 1

MK715

Voltage 2

Optional

Capacitor

SELGP

GP

SELPL

PL

ADC

PLZERO=0

(transistor

off)

If PL or GP are unused, they should be connected to ground.

The capacitors connected to GP and PL are optional and will reduce noise on the ADC input.

10

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