Infineon Technologies CY8CMBR2016-24LQXIT

Overview

CY8CMBR2016-24LQXIT from Cypress Semiconductor is a hardware-configurable 16-button capacitive touch matrix controller with SmartSense auto-tuning, 48-pin QFN (6 × 6 × 0.6 mm) package, 1.71–5.5 V supply range, and deep sleep current of 100 nA. It supports 3×4/4×4 matrix configurations, key scan/truth table/encoded GPO host interfaces, and performs system diagnostics at power-up for button shorts, CMOD faults, and CP out-of-range conditions - deployed in fire alarm panels, security keypads, and battery-powered door locks.

For engineers reviewing the CY8CMBR2016-24LQXIT datasheet, CY8CMBR2016-24LQXIT pinout, CY8CMBR2016-24LQXIT application, or CY8CMBR2016-24LQXIT equivalent, key selection considerations include matrix interface mode selection (SCAN/READ vs. truth table), FSS enablement for high-density layouts, sensitivity configuration via external resistor, and debug UART output on DEBUG pin for production line validation.

Technical Context

The device implements a fully hardware-configured CapSense sensing engine with no firmware required: SmartSense dynamically adjusts IDAC, scan time, and threshold parameters in real time across 5–40 pF parasitic capacitance range. Its three configurable host interfaces - Key Scan (4 SCAN / 4 READ lines), Truth Table (16-bit encoded output), and Encoded GPO (4-bit output) - share the same OUT0–OUT7 pins but are selected via OUT_SEL pin voltage level.

Flanking Sensor Suppression (FSS) logic resolves multi-touch ambiguity by retaining prior button state when adjacent buttons activate simultaneously - critical for UP/DOWN control pairs. System diagnostics monitor CMOD capacitor integrity, button shorting, and CP drift at power-on, reporting failures via interrupt assertion before host initialization.

Key Specifications

Pinout & Package

48-pin QFN package (6 × 6 × 0.6 mm, 0.4 mm pitch), exposed thermal pad, RoHS-compliant. Pin functions validated per Cypress Document 001-67921 Rev. *F.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive touch matrix controller applications.

Compared with AT42QT2160-MAHR and STMPE1600QTR, CY8CMBR2016-24LQXIT uniquely delivers zero-firmware operation, 100 nA deep sleep, on-chip buzzer drive, and production-ready UART debug - making it optimal for cost-sensitive, battery-powered, and retrofit mechanical-keypad replacement designs.

Availability

CY8CMBR2016-24LQXIT is available at Aetrix Electronics and suitable for fire alarm panels, security keypads, and battery-powered door locks requiring stable component supply, long-term lifecycle support, and RoHS-compliant QFN packaging.

Supply support for CY8CMBR2016-24LQXIT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) designs programmable silicon solutions for embedded systems, focusing on PSoC, memory, and human-machine interface technologies.

CY8CMBR2016 belongs to the CapSense Express™ family - purpose-built for hardware-configurable, firmware-free capacitive touch interfaces in industrial, security, and building automation applications.

FAQ

What host interface modes does CY8CMBR2016-24LQXIT support, and how are they selected?

The device supports Key Scan (4×4 or 3×4 matrix), Truth Table (16-bit parallel), and Encoded GPO (4-bit output) modes. Selection is made by applying specific voltage levels to the OUT_SEL pin using external resistors - no firmware or programming is involved. Each mode reuses the same OUT0–OUT7 pins with different functional assignments defined at power-on.

How does SmartSense auto-tuning eliminate manual calibration during production?

SmartSense dynamically adjusts IDAC current, scan time, and baseline thresholds in real time to maintain stable button response across 5–40 pF parasitic capacitance range. It compensates for PCB stack-up variations, manufacturing tolerances, and environmental shifts - removing the need for per-unit or per-batch tuning during assembly or test.

What diagnostic faults does CY8CMBR2016-24LQXIT report at power-up?

At power-on, the device checks for three critical faults: shorted CapSense buttons (CSx pins), incorrect or missing 2.2 nF CMOD capacitor, and parasitic capacitance exceeding 40 pF on any enabled button. All faults assert the INT pin low and halt normal operation until corrected - enabling immediate detection during manufacturing test or field deployment.

Can CY8CMBR2016-24LQXIT drive a buzzer directly, and what are the electrical limits?

Yes - the dedicated BUZZER pin provides push-pull DC output capable of driving standard 3–5 V DC buzzers up to 20 mA peak current. No external transistor or driver circuit is required. The output is active during button press events and can be disabled via hardware configuration if audio feedback is not needed.