XPT2046 Touch Screen Controller IC

15 September 2020 - 0 Comments

XPT2046 Touch Screen Controller

XPT2046 Pinout

XPT2046 is a touch screen controller that uses a 4-wire resistive touch screen control system with a 12-bit 125 Khz A/D converter. The major advantage of this product is not only it detects the location of the touched screen but it could also measure the touch screen pressure. It has an inbuilt voltage reference that is very useful to measure the temperature, battery monitoring with an ability to measure voltage from 0V to 5V range.

Pin Description of XPT2046

Pin Number	Pin Name	Description
1	VCC	Power Supply
2	XP	XP Position Input
3	YP	YP Position Input
4	XN	XN Position Input
5	YN	YN Position Input
6	GND	Ground
7	VBAT	Battery Monitor input
8	AUX	Auxillary input to ADC
9	VREF	Voltage reference Input / Output
10	IOVDD	Digital IO Power SUpply
11	PENIRQ	Pen Interrupt
12	DOUT	Serial Data output
13	BUSY	Busy Output
14	DIN	Serial Data Input
15	CS	Chip Select Input
16	DCLK	External clock input

Features and Specification of XPT2046

12 bit SAR type A/D converter with S/H circuit
Low voltage operations (VCC = 2.2V - 3.6V)
Low power consumption (260uA)
125 kHz sampling frequency
On-chip reference voltage - 2.5V
Pen pressure measurement
On-chip thermo sensor
Direct battery measurement
4-wire I/F

Note: Complete technical details can be found in the XPT2046 Datasheet, linked at the bottom of this page.

Alternative Product of XPT2046

Alternative product of this touch sensor IC-

1. MAX11855

2. MK712

3. SSD231

XPT2046 Touch Controller IC - Overview

The XPT2046 touch controller is equipped with touch position detection, touch pressure detection, battery voltage measurement, and chip temperature. The IC uses a successive approximation register (SAR) analog-to-digital converter with -bit resolution. The data can be harvested through-wire connection between the XPT2046 and microcontroller.

It has a converter status pin that notifies the host controller about the busy state of the converter. There is a pen interrupt function available in the XPT2046 Touch Controller IC. It is also a useful thing in power down or sleeps mode related functions.