Infineon Technologies CY7C64343-32LQXCT

Overview

CY7C64343-32LQXCT from Infineon Technologies (formerly Cypress Semiconductor) is a full-speed USB 2.0 microcontroller with an integrated M8C Harvard-architecture CPU, 32 KB flash, 2048 bytes SRAM, and eight unidirectional + one bidirectional USB endpoints. It operates at up to 24 MHz, supports crystal-less USB timing with ±0.25% accuracy locked to USB data, and delivers configurable I/O with hot-swappable capability on Port 1 - used in industrial HID devices, USB-to-serial bridges, and embedded peripheral controllers.

For engineers reviewing the CY7C64343-32LQXCT datasheet, CY7C64343-32LQXCT pinout, CY7C64343-32LQXCT application, or CY7C64343-32LQXCT equivalent, key selection criteria include USB 2.0 TID# 40000893 compliance, 3.15–3.45 V or 4.35–5.25 V USB-enabled supply ranges, programmable LDO on Port 1 (1.8/2.5/3.0 V), 10-bit ADC with temperature sensor integration, and I²C/SPI dual-mode peripheral support.

Technical Context

The device implements a dedicated Serial Interface Engine (SIE) that handles USB protocol tasks autonomously - including CRC generation/checking, address filtering, ACK/NAK/Stall handshaking, and SOF frame counting - reducing firmware overhead. Its internal main oscillator (IMO) achieves ±0.25% accuracy during USB operation without external crystals, using USB data stream lock for timing reference.

System-level resources include three 16-bit timers, watchdog/sleep timers, hardware I²C slave with address recognition (50/100/400 kHz), SPI master/slave with 46.9 kHz–12 MHz clock range, and a 10-bit ADC with integrator-based architecture supporting both external voltage sensing and on-die temperature measurement via shared analog mux bus.

Key Specifications

Pinout & Package

Package: 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), thermally enhanced with exposed pad - suitable for compact industrial and consumer PCB layouts requiring low profile and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-speed USB microcontroller applications.

Compared with CP2102N-A02-GM and STM32F072CBT6, CY7C64343-32LQXCT offers unique crystal-less USB timing, integrated SIE offload, and hot-swappable I/O - making it optimal for cost-sensitive, firmware-customizable USB peripherals where minimal external components and robust field replaceability are critical.

Availability

CY7C64343-32LQXCT is available at Aetrix Electronics and suitable for industrial HID devices, USB-to-serial bridges, and embedded peripheral controllers requiring stable component supply, long-term lifecycle support, and qualified sourcing for production programs.

Supply support for CY7C64343-32LQXCT 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive MCUs, and secure connectivity solutions.

This device belongs to the enCoRe™ V family - designed specifically for cost-optimized, single-chip USB peripheral implementations where minimal external components, firmware flexibility, and USB certification assurance are essential.

FAQ

Does CY7C64343-32LQXCT require an external crystal for USB operation?

No. The device uses an internal main oscillator (IMO) that locks to the USB data stream, achieving ±0.25% accuracy without any external crystal or resonator. External crystals are optional and only needed if precise non-USB timing (e.g., RTC or UART baud rate stability) is required beyond USB compliance.

What is the maximum sink current capability of Port 1 GPIOs?

Each Port 1 GPIO supports up to 25 mA sink current. The total sink current across all Port 1 pins is limited to 60 mA. This rating applies under specified thermal conditions and must be derated if multiple pins operate simultaneously at high duty cycles or elevated ambient temperatures.

Can the integrated 10-bit ADC measure external voltages?

Yes. The ADC can be configured via firmware to sample external analog signals applied to designated GPIO pins (e.g., P0[0]–P0[3]) through the analog multiplexer bus. Input range is 0 V to VREFADC (typically VDD), and conversion results are accessible via dedicated registers without CPU intervention during sampling.

Is CY7C64343-32LQXCT supported by modern development tools?

Yes. Although PSoC Designer™ is legacy software, Infineon provides updated toolchain support via ModusToolbox™ with USBFS middleware and example projects. Firmware migration paths, datasheets, and application notes remain actively maintained on the Infineon website under the enCoRe V product page.