EmbeddedRelated.com
The 2026 Embedded Online Conference
CAP1128-1-BP-TR

MCHPCAP1128-1-BP-TR

Microchip Technology
Capacitive Touch Buttons 20-QFN (4x4)
Active9,954 in stock

Overview

The CAP1128-1-BP-TR is an 8-channel capacitive touch controller designed for creating reliable human-machine interfaces. It supports proximity detection and features two integrated LED drivers with PWM control, allowing for synchronized visual feedback. The device communicates via I2C, SMBus, or SPI and includes a dedicated wake output for low-power operation.

Why Choose This Part

It offers superior noise immunity through analog filtering and automatic recalibration to compensate for environmental changes or parasitic capacitance. The device is highly power-efficient, consuming only 5uA in deep sleep while maintaining the ability to wake the host processor via a dedicated pin.

Applications

Home Automation Panels
Used for touch-sensitive light switches, thermostat controls, and security keypads where high reliability is required.
Consumer Electronics
Ideal for sleek, button-less interfaces on appliances, media players, and desktop peripherals.
Industrial Interfaces
Provides a robust touch solution for sealed or ruggedized equipment that requires operation from -40 to 125 degrees Celsius.
Proximity Sensing
Utilizes increased sensitivity to detect a hand or finger approaching a device to wake the system from deep sleep.

Key Specifications

Type Buttons
Interface I2C, SMBus, SPI
Mounting Type Surface Mount
Package / Case 20-TQFN Exposed Pad
Current - Supply 500uA
Number of Inputs 8
Voltage - Supply 3V ~ 3.6V
LED Driver Channels 2
Proximity Detection Yes
Operating Temperature -40degC ~ 125degC
Supplier Device Package 20-QFN (4x4)

Getting Started

Designers can evaluate this part using the CAP1128 Evaluation Board (EVB-CAP1128). Firmware development is simplified by the Microchip CAP11xx library, and hardware integration is straightforward due to the flexible I2C/SPI interface and the small 4x4mm QFN package.

The 2026 Embedded Online Conference