Infineon Technologies CY8C20524-12PVXI

Overview

CY8C20524-12PVXI from Infineon Technologies (formerly Cypress Semiconductor) is an 8-bit programmable CapSense® PSoC system-on-chip with integrated capacitive sensing controller, 8 KB flash, 512-byte SRAM, and up to 28 GPIOs. It operates from 2.4 V to 5.25 V, delivers 1.5 mA active current at 3.0 V/12 MHz, supports up to 25 buttons + 1 slider + 10 cm proximity sensing, and targets embedded human-interface applications such as notebook multimedia keypads.

For engineers reviewing the CY8C20524-12PVXI datasheet, CY8C20524-12PVXI pinout, CY8C20524-12PVXI application, or CY8C20524-12PVXI equivalent, key selection criteria include CapSense scan speed (1 kHz nominal), internal 6/12 MHz IMO + 32 kHz ILO, LDO regulation (3 V out), I²C/SPI interface support, and field-upgradable bootloader capability.

Technical Context

The CY8C20524-12PVXI integrates a Harvard-architecture M8C CPU core (2 MIPS @ 12 MHz) with dedicated hardware-accelerated CapSense analog block, including relaxation oscillator, IDAC reference buffer, comparator, and global analog bus. Its analog mux enables dynamic routing of any GPIO to the CapSense engine without external components.

System resources include configurable I²C slave (up to 400 kHz) and SPI master/slave (up to 3 MHz), 3 V fixed-output LDO with register-controlled bypass, internal 1.8 V analog reference, POR/LVD circuitry, and sleep/watchdog timers - all coordinated via interrupt controller and shared system bus.

Key Specifications

Pinout & Package

Package: 28-pin SSOP (Small Outline Integrated Circuit, Plastic, Shrink), 300 mil width, JEDEC MO-153 compliant. Body dimensions: 10.2 mm × 5.3 mm × 1.75 mm (max), lead pitch: 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20624-12PVXI, this part offers cost-optimized memory sizing for simpler UIs; versus STM32F072CBT6, it delivers deterministic 1 kHz scan timing and superior noise immunity without firmware development burden.

Availability

CY8C20524-12PVXI is available at Aetrix Electronics and suitable for notebook HMI, industrial control panels, and smart appliance interfaces requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.

Supply support for CY8C20524-12PVXI 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and secure microcontrollers, with global R&D and manufacturing infrastructure.

This device belongs to the legacy PSoC 1 CapSense family - designed specifically for cost-sensitive, ultra-low-power capacitive touch interfaces where hardware-accelerated sensing and minimal external components are mandatory.

FAQ

What is the maximum number of simultaneous CapSense electrodes supported?

The CY8C20524-12PVXI supports up to 25 independent capacitive buttons plus one linear slider, using hardware-multiplexed scanning across Ports 0 and 1. Electrode count is limited by physical pin count (16 pins with CapSense capability) and firmware-configured scan resolution - not by CPU load due to dedicated analog block acceleration.

Does this device require an external crystal for CapSense operation?

No. The device uses an internal relaxation oscillator and IMO (6/12 MHz) for CapSense timing - no external crystal, resonator, or RC network is needed. The 32 kHz ILO provides low-power sleep timing, and both oscillators are factory-trimmed to ±5% accuracy.

Can the internal LDO be disabled to use an external regulated supply?

Yes. The LDO is controlled by the LDOEN bit in the PM_ACT_CFG register. When cleared, the LDO is bypassed and VDD is routed directly to I/O buffers - enabling use of an external 3.0 V or 3.3 V supply while maintaining full GPIO functionality and CapSense operation.

Is ISSP programming supported in-circuit after soldering?

Yes. In-System Serial Programming (ISSP) uses the SWD pin and VDD/VSS for power and ground, requiring only three connections. It supports full flash erase, program, verify, and debug operations without removing the device from the PCB - verified per Cypress Application Note AN2295.