Infineon Technologies CY8C21434-24LCXI

Overview

CY8C21434-24LCXI from Cypress Semiconductor is a programmable mixed-signal System-on-Chip (PSoC) integrating an M8C 8-bit Harvard architecture microcontroller, four digital PSoC blocks, and four analog Type "E" blocks. It operates at up to 24 MHz, supports 2.4–5.25 V supply (or down to 1.0 V with on-chip switch-mode pump), and delivers 8 KB Flash, 512 B SRAM, and configurable GPIO for capacitive sensing, motor control, and industrial HMI applications.

For engineers reviewing the CY8C21434-24LCXI datasheet, CY8C21434-24LCXI pinout, CY8C21434-24LCXI application, or CY8C21434-24LCXI equivalent, key selection criteria include its 24 MHz M8C core, dual 8-bit ADC capability, I²C/SPI/UART peripheral flexibility, analog mux support for up to 28 GPIO-based capacitive sensing inputs, and industrial temperature range (–40°C to +85°C).

Technical Context

The CY8C21434-24LCXI implements a fixed-function M8C CPU core with Harvard architecture, internal ±2.5% 24/48 MHz IMO oscillator, and ILO for low-power sleep/wake timing. Its digital system comprises four 8-bit PSoC blocks configurable as timers, PWMs (8–32 bit), UART, SPI, CRC generators, or PRS modules - all routable to any GPIO via global digital interconnect buses.

The analog system integrates four Type "E" blocks: two CT and two SC, supporting comparators with DAC or 1.3 V reference, single/dual 8-bit ADC (28-channel), and capacitive sensing via dedicated analog mux bus with hardware-controlled precharge. All analog resources share a common internal analog bus and connect through an 8:1 port-0 multiplexer.

Key Specifications

Pinout & Package

Package: 28-pin SOIC (SOIC-28, body width 300 mil, JEDEC MS-012AC). Pinout validated per Cypress datasheet 38-12025 Rev. *P, pages 22–24 (Pin Configuration and Functions table).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable mixed-signal controller applications.

Compared with CY8C21534-24LFXI, the CY8C21434-24LCXI trades memory headroom for cost-sensitive integration; versus CY8C20434-24LKXI, it provides full programmability at the expense of CapSense-optimized SNR and lower active current.

Availability

CY8C21434-24LCXI is available at Aetrix Electronics and suitable for industrial HMI, portable medical devices, smart sensor nodes, and battery-powered consumer electronics requiring stable component supply and long-term lifecycle support.

Supply support for CY8C21434-24LCXI 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 high-performance, mixed-signal programmable solutions for embedded systems, with expertise in PSoC architecture, CapSense, and USB connectivity.

The CY8C21x34 product line targets cost-sensitive, low-power embedded control applications requiring integrated analog sensing, digital logic, and firmware flexibility - especially where capacitive user interfaces or battery-operated operation are critical.

FAQ

Does CY8C21434-24LCXI support in-system programming (ISP) without external hardware?

Yes. It supports In-System Serial Programming (ISSP) via dedicated PSoC pins (P1[0]–P1[3]) using a standard UART or I²C host interface. No external programmer is needed after initial firmware load - field updates can be performed using onboard bootloader code stored in protected flash sectors.

Can the internal 1.3 V reference be used as ADC reference for absolute voltage measurements?

Yes. The internal 1.3 V reference is routed to the ADC's VREF+ input and is specified at ±1.5% over temperature and voltage. When used with the 8-bit ADC, it enables absolute measurement of signals up to 1.3 V with ±5 mV accuracy - suitable for battery voltage monitoring or sensor calibration without external reference ICs.

What is the maximum achievable PWM resolution and frequency when using digital PSoC blocks?

Using a single digital block, PWM resolution is 8 bits at up to 24 MHz base clock (3.0 MHz max frequency). Combining two blocks yields 16-bit resolution at up to 93.75 kHz (with 24 MHz clock and 256× prescaler). Dead-band insertion adds minimal jitter (<25 ns) and is fully configurable in PSoC Designer.

Is capacitive sensing supported on all 28 GPIO pins simultaneously?

No. While up to 28 GPIO pins are available for analog input, the analog mux bus and Type "E" block architecture limit concurrent active sensing to 8 pins per scan cycle. Full 28-pin scanning requires time-multiplexed acquisition with software-managed channel sequencing - typical scan time is 1.2 ms per 8-pin group at default settings.