Key facts
- Brand
- NXP
- Model
- LPC11xx
- Category
- microcontrollers
- Industry
- Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2026-10-17
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NXP LPC11xx Capacitive Touch Sensing Application Note
This document explains how to implement a simple capacitive touch sensing function using the Analog-to-Digital Converter (ADC) input of the NXP LPC11xx microcontroller. It details the working mode of the system, which involves charging an external capacitor via an IO pin configured as an output, followed by discharging it while configured as an ADC input to detect changes in capacitance caused by a finger touch. The process includes configuring the pin, starting the ADC conversion, sampling the result, and debouncing the signal.
Read onlineNXP LPC11xx specifications
| CPU Architecture | ARM Cortex-M0 |
|---|---|
| Maximum CPU Frequency | 50 MHz |
| Flash Memory | Up to 32 kB |
| SRAM | Up to 8 kB |
| ADC Resolution | 8-bit |
| GPIO Pins | Up to 27 |
| Power Supply | 1.65 V to 1.95 V |
| Deep-sleep Current | < 1.6 A |
Source: NXP LPC111xLV/LPC11xxLVUK 32-bit ARM Cortex-M0 Microcontroller Datasheet
All NXP LPC11xx documents by type
How to use the product for one specific task, with worked examples.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What hardware is used for the demonstration in this note?
The demonstration uses the PCF8883 evaluation kit with a MicroCore48 board.
Which microcontroller series is covered?
The application note covers the LPC11xx series microcontrollers.
What is the maximum operating frequency of the LPC111xLV/LPC11xxLVUK?
The devices operate at CPU frequencies of up to 50 MHz.
From: NXP LPC111xLV/LPC11xxLVUK 32-bit ARM Cortex-M0 Microcontroller Datasheet
What packages are available for the LPC111xLV/LPC11xxLVUK?
The microcontroller is available as WLCSP25, HVQFN24, and HVQFN33 packages.
From: NXP LPC111xLV/LPC11xxLVUK 32-bit ARM Cortex-M0 Microcontroller Datasheet