Infineon Technologies CY7C64343-32LQXC

Overview

CY7C64343-32LQXC from Infineon Technologies (formerly Cypress Semiconductor) is a full-speed USB 2.0 microcontroller with M8C Harvard-architecture core, 32 KB flash, 2048 bytes SRAM, and integrated USB transceiver supporting 12 Mbps operation without external crystal. It operates at up to 24 MHz CPU speed, supports 3.15–3.45 V or 4.35–5.25 V USB supply ranges, and delivers 36 GPIO with hot-swappable Port 1 for industrial human-interface devices.

For engineers reviewing the CY7C64343-32LQXC datasheet, CY7C64343-32LQXC pinout, CY7C64343-32LQXC application, or CY7C64343-32LQXC equivalent, key selection criteria include USB endpoint count (9 total), programmable LDO on Port 1 (1.8/2.5/3.0 V), I²C slave with hardware address detection, 10-bit ADC with temperature sensor integration, and ISSP in-system programming capability.

Technical Context

The device integrates a dedicated Serial Interface Engine (SIE) that handles USB protocol tasks-CRC generation/checking, token decoding, ACK/NAK handshaking, and SOF frame counting-without firmware intervention. Its 512-byte USB-dedicated SRAM is managed via the PSoC Memory Arbiter (PMA), enabling direct buffer access by the M8C core.

System clocking combines an internal main oscillator (IMO) with ±5.0% accuracy-locked to USB data for 0.25% stability without external components-and a 32 kHz internal low-speed oscillator (ILO) for watchdog and sleep timing. The IMO supports 6/12/24 MHz outputs, with 24 MHz required for full-speed USB operation.

Key Specifications

Pinout & Package

Package: 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, moisture sensitivity level 3.

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, CY7C64343-32LQXC uniquely combines full-speed USB controller, programmable M8C core, integrated LDO I/O, and crystal-less operation in a single 32-pin package-optimizing for cost-sensitive, space-constrained HID and industrial adapter designs.

Availability

CY7C64343-32LQXC is available at Aetrix Electronics and suitable for USB human-interface devices, industrial control panels, battery-monitoring peripherals, and programmable USB adapters requiring stable component supply across production lifecycles.

Supply support for CY7C64343-32LQXC 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 systems, automotive MCUs, and secure connectivity solutions.

This device belongs to the enCoRe™ V family-designed specifically to replace discrete USB interface ICs and microcontrollers in cost-sensitive, low-power full-speed USB peripheral applications with minimal external components.

FAQ

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

No. The device uses an internal main oscillator (IMO) that locks to USB data stream timing, achieving ±0.25% accuracy without any external crystal or resonator. External timing components are optional and only used if higher precision or non-USB system clocking is required.

What is the maximum sink/source current capability per GPIO?

Each GPIO supports 25 mA sink current. Total sink limits are 60 mA on even port pins, 60 mA on odd port pins, and 120 mA across all GPIOs. Source current is –5 mA on Ports 0–1 and –1 mA on Ports 2–4, with a total of –20 mA across all pins.

Can the 10-bit ADC measure external voltages without additional components?

Yes-the ADC input can be routed from the analog mux bus instead of the default temperature sensor. With proper external scaling (e.g., resistor divider for >VREFADC signals) and stable reference, it measures external DC voltages such as battery rails or sensor outputs.

Is in-system programming supported, and what interface is used?

Yes. In-system serial programming (ISSP) is fully supported using four GPIO pins (SDA, SCL, RESET, and VPP). No dedicated debug header or external programmer is needed-firmware updates can be performed in the final product using simple UART or custom bootloader protocols.