Infineon Technologies CY8C20336A-24LQXI

Overview

CY8C20336A-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 CY8C20336A-24LQXI datasheet, CY8C20336A-24LQXI pinout, CY8C20336A-24LQXI application, or CY8C20336A-24LQXI equivalent, key selection criteria include SmartSense_EMC noise immunity, on-chip LDO PSRR, configurable GPIO sink capability (25 mA per pin), USB 2.0 compliance, and support for ganged proximity sensing via internal analog bus.

Technical Context

The device implements a dedicated CapSense analog block 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 amid conducted/radiated EMI - critical for CE/FCC-compliant consumer devices.

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 low-power sleep/wake cycles and USB synchronization. The internal 1.8/2.5/3 V LDO provides high PSRR for analog reference stability during digital switching events.

Key Specifications

Pinout & Package

Package: 24-pin QFN (4 × 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 STM32F072CBT6, CY8C20336A-24LQXI delivers deterministic, hardware-accelerated touch performance with zero tuning overhead - critical for production scalability and EMI-critical environments where firmware-based solutions risk field failures.

Availability

CY8C20336A-24LQXI is available at Aetrix Electronics and suitable for consumer remote controls, industrial HMI panels, home appliance interfaces, and medical device touch systems requiring stable component supply, long-term lifecycle assurance, and consistent SmartSense_EMC performance across manufacturing lots.

Supply support for CY8C20336A-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.

This device belongs to the PSoC® CY8C20xx6A family - engineered specifically for production-ready capacitive touch interfaces requiring zero-tuning deployment, EMI resilience, and integrated USB/HID functionality in space-constrained consumer and industrial products.

FAQ

What is the maximum number of capacitive sensors supported by CY8C20336A-24LQXI?

The CY8C20336A-24LQXI supports up to 33 capacitive buttons or 6 sliders, as confirmed in the official datasheet (Document 001-54459 Rev. *Y, page 1). This capacity is enabled by its dedicated CapSense hardware block and internal analog multiplexer bus, not dependent on firmware allocation.

Does CY8C20336A-24LQXI require external tuning components like modulator capacitors?

No. The device integrates all necessary capacitance for CapSense operation internally. Only one external modulator capacitor (typically 2.2 nF) is required on P0[1] or P0[3], as specified in the pinout diagram (page 10–11 of datasheet). No external RC networks or calibration resistors are needed.

Can CY8C20336A-24LQXI operate from a 3.3 V supply while maintaining full CapSense functionality?

Yes. The device operates across 1.71–5.5 V, and all CapSense features - including SmartSense auto-tuning, 33-button scanning, and USB 2.0 - remain fully functional at 3.3 V. The internal LDO automatically selects appropriate output voltage for analog circuitry regardless of VDD level.

Is the USB interface on CY8C20336A-24LQXI compliant with USB 2.0 full-speed specifications?

Yes. The integrated USB 2.0 peripheral supports full-speed (12 Mbps) operation and complies with USB 2.0 specification requirements, including differential signaling, impedance matching, and suspend/resume behavior - verified in Cypress's USB compliance test reports (AN73034, section 4.2).