Infineon Technologies CY7C64316-16LKXCT

Overview

CY7C64316-16LKXCT from Infineon Technologies (formerly Cypress Semiconductor) is a full-speed USB 2.0 microcontroller featuring an M8C Harvard-architecture CPU running up to 24 MHz, 32 KB flash, 2048 bytes SRAM, integrated USB transceiver with 512-byte dedicated buffer, and eight unidirectional + one bidirectional USB endpoint. It operates at 3.15–3.45 V or 4.35–5.25 V with USB enabled and supports industrial temperature range (–40 °C to +85 °C), targeting embedded USB peripheral designs such as HID devices and sensor interfaces.

For engineers reviewing the CY7C64316-16LKXCT datasheet, CY7C64316-16LKXCT pinout, CY7C64316-16LKXCT application, or CY7C64316-16LKXCT equivalent, key selection criteria include USB 2.0 TID# 40000893 compliance, crystal-less operation with ±0.25% IMO accuracy locked to USB data, hot-swappable Port 1 I/O, configurable 10-bit ADC, and I²C/SPI dual-interface support for system integration.

Technical Context

The device integrates a dedicated Serial Interface Engine (SIE) that autonomously handles USB packet encoding/decoding, CRC generation/checking, address filtering, ACK/NAK/Stall handshaking, and SOF frame counting-reducing firmware overhead. Its M8C core executes at up to 24 MHz with four-MIPS throughput, requiring exact 24 MHz system clock for maximum USB 12 Mbps throughput.

System resources include hardware-accelerated I²C slave (50/100/400 kHz, address detection, sleep-mode operation <100 µA), SPI master/slave (46.9 kHz–12 MHz), three 16-bit timers, watchdog/sleep timers, and a 10-bit ADC with temperature sensor integration and analog mux bus routing-enabling battery monitoring and mixed-signal sensing without external components.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), lead-free, RoHS-compliant - designated by suffix "LKXC" per Cypress/Infineon ordering nomenclature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CP2102N-A02-GQFN24 and STM32F072CBT6, CY7C64316-16LKXCT uniquely combines crystal-less USB timing, hot-swappable I/O, and integrated LDO in a compact 48-pin QFN-making it optimal for cost-sensitive, space-constrained USB peripherals requiring firmware customization and mixed-voltage interoperability.

Availability

CY7C64316-16LKXCT is available at Aetrix Electronics and suitable for USB human interface devices, industrial sensor interfaces, programmable docking stations, and USB-C accessory controllers requiring stable component supply across production lifecycles.

Supply support for CY7C64316-16LKXCT 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, industrial, and USB connectivity solutions.

CY7C64316-16LKXCT belongs to the enCoRe™ V family-designed specifically to replace multi-chip USB peripheral systems with a single, low-cost, programmable microcontroller offering full-speed USB 2.0 compliance, flexible memory, and mixed-signal integration.

FAQ

Does CY7C64316-16LKXCT require an external crystal for USB operation?

No. The device features an internal main oscillator (IMO) with ±0.25% accuracy when locked to USB data traffic, eliminating the need for an external crystal or resonator. This reduces BOM cost, PCB area, and EMI concerns-confirmed in the official Infineon datasheet (Document Number: 001-12394 Rev. *V, Section "Precision, programmable clocking").

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

Each GPIO supports 25 mA sink current. Total sink current is limited to 60 mA on even port pins and 60 mA on odd port pins (120 mA aggregate). Source current is –5 mA on Ports 0–1 and –1 mA on Ports 2–4, with a total source limit of 20 mA-specified in the "DC Electrical Characteristics" table (page 18) of the datasheet.

Can CY7C64316-16LKXCT operate in USB suspend mode while maintaining I²C slave functionality?

Yes. The I²C slave peripheral supports wake-from-sleep operation with hardware address detection and draws less than 100 µA during active I²C listening in sleep modes-enabling low-power sensor hub applications where the device remains responsive to I²C commands without full USB activity.

Is the 10-bit ADC capable of measuring external voltages, or only internal temperature?

The ADC can measure both. By default, it connects to the on-die temperature sensor diodes, but the analog mux bus allows reconfiguration to accept external analog inputs (0 V to VREFADC) for battery voltage monitoring or other analog signal digitization-documented in the "10-bit ADC" section (page 4) and ADC User Module description.