Infineon Technologies CY8C20536A-24PVXI

Overview

CY8C20536A-24PVXI 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, draws 28 µA/sensor in active scan mode (125 ms 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 CY8C20536A-24PVXI datasheet, CY8C20536A-24PVXI pinout, CY8C20536A-24PVXI application, or CY8C20536A-24PVXI 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 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 under conducted/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 CapSense scanning and USB frame synchronization. The internal 1.8/2.5/3.0 V LDO ensures high PSRR for analog sensing integrity across supply variations.

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, CY8C20536A-24PVXI provides full programmability and USB HID integration; compared with CY8C21434-24PVXI, it offers lower memory and cost while retaining identical CapSense performance and SmartSense_EMC noise immunity for mid-tier designs.

Availability

CY8C20536A-24PVXI is available at Aetrix Electronics and suitable for consumer remote controls, industrial HMI panels, medical patient monitors, and smart home thermostats requiring stable component supply and long-term production continuity.

Supply support for CY8C20536A-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 configurability, low-power operation, and system-level integration.

CY8C20xx6A is part of the CapSense® Express family, engineered specifically for cost-sensitive, high-volume capacitive touch applications where rapid development, EMI robustness, and minimal external components are essential.

FAQ

What is the maximum number of capacitive sensors supported by CY8C20536A-24PVXI?

The CY8C20536A-24PVXI supports up to 33 capacitive sensing inputs - configurable as individual buttons or grouped into up to six linear or rotary sliders. This count includes all GPIOs assigned to CapSense function; actual usable count depends on pin allocation for I²C, USB, or other system signals.

Does CY8C20536A-24PVXI require external tuning components for CapSense operation?

No external tuning resistors or capacitors are required for baseline CapSense operation. Only one external modulator capacitor (typically 22 nF) is needed on the MOD_CAP pin. SmartSense auto-tuning eliminates manual calibration of IDAC, scan speed, or baseline filters during development or production.

Can CY8C20536A-24PVXI operate from a single 3.3 V supply?

Yes - the device operates across 1.71 V to 5.5 V. At 3.3 V, all GPIOs deliver full 25 mA sink current, USB remains fully functional, and SmartSense_EMC maintains its specified noise immunity. Internal LDO regulates analog circuitry independently, ensuring consistent sensing performance regardless of supply rail variation.

Is PSoC Designer software still supported for CY8C20536A-24PVXI development?

Yes - PSoC Designer v5.4 is the official, final-supported IDE for CY8C20xx6A devices. Cypress provides archived downloads and documentation including AN73034 (CapSense Design Guide) and the TRM (Document #001-54459). No migration to PSoC Creator or ModusToolbox is required or supported for this generation.