Infineon Technologies CY8C20546-24PVXI

Overview

CY8C20546-24PVXI from Cypress Semiconductor is a programmable CapSense®-enabled PSoC® mixed-signal IC integrating an M8C 8-bit Harvard architecture microcontroller, dedicated capacitive sensing hardware, 16 KB Flash/2 KB SRAM, and up to 36 GPIO. It operates from 1.71V to 5.5V across –40°C to +85°C and supports touch buttons, sliders, and proximity sensing in space-constrained human interface applications.

For engineers reviewing the CY8C20546-24PVXI datasheet, CY8C20546-24PVXI pinout, CY8C20546-24PVXI application, or CY8C20546-24PVXI equivalent, key selection criteria include its integrated CapSense block with hardware-accelerated scanning, 24 MHz M8C core, configurable analog mux, I²C/SPI peripherals, and 24-pin SSOP package with 25 mA sink capability per GPIO.

Technical Context

The device implements a dedicated CapSense analog subsystem with internal 1.2 V reference, high-PSRR comparator, and global analog bus enabling simultaneous connection of any GPIO to sensing circuitry. Scanning is performed in hardware without CPU intervention, supporting up to 36 capacitive inputs with configurable resolution and baseline tracking.

Its M8C core runs at up to 24 MHz with interrupt controller, sleep/watchdog timers, and dual oscillators (6/12/24 MHz IMO + 32 kHz ILO). System resources include three 16-bit timers, 8-bit delta-sigma ADC, two analog comparators, I²C slave (50/100/400 kHz), SPI master/slave (46.9 kHz–12 MHz), and programmable digital I/O on Port 1 with hot-swap capability.

Key Specifications

Pinout & Package

Package: 24-pin SSOP (0.635 mm pitch, 7.5 mm × 12.8 mm body).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20646-24LTXI, CY8C20546-24PVXI removes USB overhead for simpler, lower-power touch-only designs; versus STM32F072CBT6, it delivers deterministic CapSense latency and lower development effort for dedicated UI functions without sacrificing industrial temperature operation.

Availability

CY8C20546-24PVXI is available at Aetrix Electronics and suitable for consumer appliance interfaces, industrial HMI panels, medical keypad systems, and automotive cabin controls requiring stable component supply and long-term industrial temperature support.

Supply support for CY8C20546-24PVXI 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 control, sensing, and connectivity applications with focus on system integration and power efficiency.

This device belongs to the PSoC® 1 family, engineered specifically to replace discrete analog/digital components in capacitive touch and human interface systems through configurable on-chip resources and hardware-accelerated sensing.

FAQ

What is the maximum number of capacitive sensors supported by CY8C20546-24PVXI?

The CY8C20546-24PVXI supports up to 36 capacitive sensing inputs, configurable across all GPIO pins. Hardware scanning handles electrode sequencing and baseline tracking autonomously, allowing full 36-input operation without CPU intervention or additional external components.

Does CY8C20546-24PVXI require an external crystal for stable operation?

No external crystal is required. The device includes an internal 6/12/24 MHz ±5% IMO and a 32 kHz ILO for sleep timing. An optional external 32 kHz crystal may be used with the precision oscillator for improved accuracy, but is not necessary for standard CapSense or I²C/SPI operation.

Can CY8C20546-24PVXI operate from a single 1.8 V supply?

Yes - the device operates across 1.71 V to 5.5 V, fully supporting 1.8 V nominal supply. At 1.8 V, the M8C core runs at reduced frequency (≤12 MHz), and GPIO drive strength scales accordingly, while CapSense functionality remains functional with adjusted IDAC settings per design requirements.

Is there hardware support for I²C address collision avoidance?

Yes - the I²C slave module includes hardware address validation that filters incoming packets before waking the CPU. Only frames matching the configured 7-bit address trigger interrupt or data transfer, reducing active current during idle bus periods to under 100 µA even in sleep modes.