XPT2046

Touch Screen Controller

15 Clocks-per-Conversion

Figure 16 provides the fastest way to clock the XPT2046.This method does not work with the serial interface of

most microcontrollers and digital signal processors, as they are generally not capable of providing 15 clock cycles

per serial transfer. However, this method can be used with field-programmable gate arrays (FPGAs) or

applicationspecific integrated circuits (ASICs). Note that this effectively increases the maximum conversion rate

of the converter beyond the values given in the specification tables, which assume 16 clock cycles per conversion.

Figure 16. Maximum Conversion Rate, 15 Clocks-per-Conversion

Data Format

The XPT2046 output data is in Straight Binary format, as shown in Figure 17. This figure shows the ideal output

code for the given input voltage and does not include the ffects of offset, gain, or noise.

Figure 17. Ideal Input Voltages and Output Codes

C

Co

op

py

yrriig

gh

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20

00

07

7,, S

SH

HE

EN

NZ

ZH

HE

EN

N X

XP

PT

TE

EK

K T

TE

EC

CH

HN

NO

OL

LO

OG

GY

Y C

CO

O..,,L

LT

TD

D

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