Infineon Technologies CY8C21323-24LQXIT

Overview

CY8C21323-24LQXIT from Cypress Semiconductor is a programmable 8-bit Harvard-architecture PSoC® SoC featuring an M8C core running up to 24 MHz, 4 KB flash, 256 bytes SRAM, and integrated analog/digital configurable blocks for mixed-signal embedded control. It operates from 2.4 V to 5.25 V (or down to 1.0 V with on-chip switch-mode pump), supports –40 °C to +85 °C industrial temperature range, and includes dual 10-bit ADCs, comparators with DAC references, and full-duplex UART/SPI/I²C interfaces - deployed in smart sensor nodes and low-power HMI controllers.

For engineers reviewing the CY8C21323-24LQXIT datasheet, CY8C21323-24LQXIT pinout, CY8C21323-24LQXIT application, or CY8C21323-24LQXIT equivalent, key selection criteria include its 24-pin QFN package, ±5% internal oscillator tolerance (±2.5% at 0–70 °C), 25-mA GPIO sink capability, configurable analog inputs on all pins, and ISSP-enabled in-system programming for rapid firmware iteration in resource-constrained designs.

Technical Context

The CY8C21323-24LQXIT implements a fixed-function M8C CPU core with Harvard architecture, paired with four digital PSoC blocks (configurable as 8–32-bit timers, PWMs, CRC/PRS) and four analog Type "E" blocks supporting dual 10-bit ADCs and two comparators with 1.3 V or 8-bit DAC reference. Its global digital/analog interconnect enables signal routing between any block and any GPIO.

Clocking relies on an internal ±5% 24/48-MHz main oscillator (IMO) and low-power ILO for sleep/wake; system resources include I²C (400 kHz), watchdog/sleep timers, user-configurable LVD, and an integrated 1.3 V voltage reference. The on-chip switch-mode pump (SMP) enables operation from single-cell 1.2 V batteries by boosting to functional rail voltages.

Key Specifications

Pinout & Package

Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), lead-free and RoHS-compliant, with exposed thermal pad for enhanced power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C21423-24LQXIT, this part trades memory capacity for lower cost and smaller footprint; versus STM32F030F4P6, it delivers true mixed-signal flexibility without external analog components or boost circuitry - reducing total solution size and bill-of-materials complexity.

Availability

CY8C21323-24LQXIT is available at Aetrix Electronics and suitable for smart sensor nodes, industrial HMI panels, and low-cost motor controllers requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for CY8C21323-24LQXIT 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) is a fabless semiconductor company specializing in programmable embedded solutions, USB controllers, memory, and connectivity ICs for industrial, automotive, and consumer markets.

The CY8C21x23 PSoC® family targets cost-sensitive, low-power mixed-signal applications where analog/digital reconfigurability replaces multiple discrete components - enabling rapid prototyping and design reuse across sensor, control, and human-interface product lines.

FAQ

Does CY8C21323-24LQXIT support USB connectivity?

No. This device does not include a USB physical layer or USB controller. It provides UART, SPI, and I²C interfaces for host communication. USB functionality requires external bridge ICs such as CY7C65215 or software-emulated bit-banged protocols on GPIOs - neither supported natively nor recommended for production use.

Can the internal 24-MHz oscillator meet tight timing requirements for UART communication?

Yes - the internal main oscillator (IMO) achieves ±5% frequency tolerance (±2.5% at 0–70 °C), which satisfies standard UART baud rates up to 115.2 kbps with typical stop-bit margins. For higher reliability at extreme temperatures or higher speeds, external crystals or calibrated firmware trimming may be applied via PSoC Designer.

Is there hardware support for cryptographic operations?

No. The CY8C21323-24LQXIT lacks dedicated crypto accelerators, TRNG, or secure key storage. Basic XOR or CRC-based integrity checks can be implemented in firmware using digital blocks, but AES, SHA, or RSA operations require software-only execution with significant CPU overhead and no side-channel protection.

What development tools are required to program this device?

PSoC Designer™ IDE (legacy, Windows-only) is mandatory for configuration, code generation, and ISSP programming. A MiniProg3 or compatible programmer/debugger is required for physical interface. No modern ARM-based tools (e.g., Keil, IAR, STM32CubeIDE) support this M8C architecture - migration to newer PSoC 4 or PSoC 6 families is necessary for contemporary toolchains.