Infineon Technologies CY8C20546A-24PVXI

Overview

CY8C20546A-24PVXI from Cypress Semiconductor is a programmable 1.8 V CapSense® controller with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard 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, achieves 28 µA/sensor average current (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 CY8C20546A-24PVXI datasheet, CY8C20546A-24PVXI pinout, CY8C20546A-24PVXI application, or CY8C20546A-24PVXI equivalent, key selection criteria include SmartSense_EMC noise immunity, on-chip LDO PSRR, dual-mode GPIO (analog/digital), 10-bit ADC with internal reference, and configurable sink/source drive (25 mA sink per GPIO, 5 mA source on Port 0/1).

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 against conducted/radiated EMI - critical for CE/FCC-compliant consumer enclosures with plastic overlays.

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 wake-up intervals and USB synchronization. The internal 1.8/2.5/3.0 V LDO provides high PSRR for analog reference stability during digital switching transients.

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 AT42QT2120-MAHR and STM32F072CBT6, CY8C20546A-24PVXI uniquely combines 33-input scalability, SmartSense_EMC noise immunity, and native full-speed USB - reducing firmware development time and eliminating external components for certified touch interfaces.

Availability

CY8C20546A-24PVXI is available at Aetrix Electronics and suitable for consumer remote controls, appliance touch panels, medical device keypads, and gaming peripheral interfaces requiring stable component supply, long-term lifecycle assurance, and production-ready touch performance.

Supply support for CY8C20546A-24PVXI 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 systems, emphasizing configurable analog/digital blocks and system-level integration.

CY8C20xx6A belongs to the PSoC® CapSense® controller family, engineered specifically for robust, production-ready capacitive touch interfaces - minimizing development risk in EMI-prone consumer and industrial environments.

FAQ

What is the maximum number of capacitive sensors supported by CY8C20546A-24PVXI?

The CY8C20546A-24PVXI supports up to 33 capacitive buttons or 6 sliders, depending on configuration. This capacity is enabled by its dedicated CapSense hardware block and 24-pin QFN package with 17 usable GPIOs for sensing (per datasheet pinout tables). Sensor count is constrained by routing and mutual capacitance crosstalk, not firmware limits.

Does CY8C20546A-24PVXI require external components for basic CapSense operation?

No external passive components are required for basic capacitive sensing. The device integrates IDACs, analog comparators, and reference buffers necessary for self-capacitance measurement. Only a modulator capacitor (typically 2.2 nF) on P0[1] or P0[3] is mandatory; all other functions - including oscillator, LDO, and USB termination - are fully internal.

Can CY8C20546A-24PVXI operate from a single 3.3 V supply?

Yes. The device operates across 1.71–5.5 V, so 3.3 V is fully supported. At 3.3 V, GPIO output drive strength increases (25 mA sink remains valid), and internal LDO can be configured for 3.0 V analog reference. USB functionality remains fully compliant without level-shifting.

How does SmartSense_EMC differ from standard SmartSense auto-tuning?

SmartSense_EMC adds proprietary noise-adaptive modulation and dynamic baseline tracking specifically tuned to reject high-frequency conducted and radiated interference (e.g., from switch-mode power supplies or 2.4 GHz radios). Standard SmartSense optimizes sensitivity and SNR under static environmental drift; SmartSense_EMC extends that to real-time EMI environments - validated per EN 61000-4-3 and FCC Part 15B test protocols.