Infineon Technologies CY8C20396A-24LQXI

Overview

CY8C20396A-24LQXI from Cypress Semiconductor is a programmable 1.8 V CapSense® controller with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 8 KB flash/1 KB SRAM, and dedicated hardware for capacitive sensing of up to 33 buttons or 6 sliders. It operates from 1.71–5.5 V, delivers 28 µA/sensor average current in runtime (125 ms scan interval), and supports I²C (up to 400 kHz), SPI, USB 2.0 (12 Mbps), and three 16-bit timers - deployed in human-interface consumer electronics requiring robust touch response under variable EMI conditions.

For engineers reviewing the CY8C20396A-24LQXI datasheet, CY8C20396A-24LQXI pinout, CY8C20396A-24LQXI application, or CY8C20396A-24LQXI equivalent, key selection criteria include SmartSense_EMC noise immunity, configurable GPIO sink capability (25 mA per pin), integrated 10-bit ADC with internal reference, USB 2.0 compliance, and support for ganged proximity sensing via analog bus routing.

Technical Context

The device implements a dedicated CapSense analog subsystem with patented CSA_EMC and CSD sensing algorithms, enabling real-time auto-tuning without host intervention. Its SmartSense_EMC algorithm dynamically adjusts sensor thresholds and modulation parameters to maintain stable operation against conducted and radiated EMI - critical for CE/FCC-compliant consumer enclosures.

It features four clock sources: 6/12/24 MHz IMO, 32 kHz ILO, external 32 kHz crystal, and external clock input - allowing precise timing control for both low-power sleep states (0.1 µA deep sleep) and high-speed USB transactions. The analog mux bus enables flexible interconnection of up to 33 GPIOs to internal comparators and reference buffers for ganged or proximity sensing configurations.

Key Specifications

Pinout & Package

Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MTCH101-I/ST and CY8C21434-24LFXI, CY8C20396A-24LQXI uniquely integrates full-speed USB 2.0, SmartSense_EMC noise immunity, and ganged proximity sensing - making it optimal for self-contained, EMI-hardened touch interfaces requiring zero-host firmware tuning.

Availability

CY8C20396A-24LQXI is available at Aetrix Electronics and suitable for consumer remote controls, industrial HMI panels, medical device keypads, and home appliance control panels requiring stable component supply across multi-year production cycles.

Supply support for CY8C20396A-24LQXI 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 mixed-signal ICs for embedded control, sensing, and connectivity applications, with global R&D and manufacturing infrastructure.

CY8C20xx6A is part of the PSoC® 1 CapSense® controller family, engineered specifically for robust, low-power capacitive touch interfaces in cost-sensitive, high-volume consumer and industrial products - emphasizing auto-tuning, EMI resilience, and rapid time-to-market.

FAQ

What is the maximum number of capacitive sensors supported by CY8C20396A-24LQXI?

The device supports up to 33 capacitive sensing inputs - configurable as individual buttons or grouped into up to 6 linear or rotary sliders. This count is physically constrained by the 24-pin QFN package's available GPIOs (P0[0]–P0[7], P1[0]–P1[7], plus select P2/P3 pins), with dedicated pins reserved for USB, I²C, and crystal oscillator functions.

Does CY8C20396A-24LQXI require external components for basic CapSense operation?

No external components are required for fundamental button sensing: the SmartSense auto-tuning engine configures internal IDACs and thresholds autonomously. A single external modulator capacitor (typically 2.2 nF) is needed on P0[1] or P0[3], and optional 32 kHz crystal improves sleep timer accuracy - but internal oscillators suffice for most applications.

Can CY8C20396A-24LQXI operate from a single 3.3 V supply?

Yes - it operates across 1.71 V to 5.5 V, fully supporting standard 3.3 V system rails. At 3.3 V, GPIO output drive strength increases (25 mA sink remains valid), and USB transceivers meet full-speed signaling requirements without level-shifting. Internal LDO automatically selects appropriate analog voltage (1.8/2.5/3.0 V) based on VDD.

How does SmartSense_EMC differ from standard SmartSense auto-tuning?

SmartSense_EMC adds a proprietary noise-detection and countermeasure layer that identifies high-frequency conducted/radiated interference (e.g., from switch-mode power supplies or RF transceivers) and dynamically adjusts scan frequency, IDAC range, and averaging depth - whereas standard SmartSense only compensates for environmental drift and manufacturing variation. This enables reliable operation in electrically noisy environments without shielding or layout redesign.