Infineon Technologies CY8C4245LQI-483T

Overview

CY8C4245LQI-483T from Infineon Technologies (formerly Cypress) is a 32-bit Arm Cortex-M0 programmable system-on-chip (PSoC® 4200 family) integrating MCU, reconfigurable analog/digital blocks, 12-bit 1-Msps SAR ADC, two opamps, and two SCBs supporting I²C/SPI/UART. It operates from 1.71 V to 5.5 V, supports –40 °C to +105 °C, and delivers 48 MHz CPU performance with up to 32 kB flash and 4 kB SRAM - used in industrial HMI, capacitive touch interfaces, and embedded sensor hubs.

For engineers reviewing the CY8C4245LQI-483T datasheet, CY8C4245LQI-483T pinout, CY8C4245LQI-483T application, or CY8C4245LQI-483T equivalent, key selection criteria include its integrated CapSense Sigma-Delta (CSD) engine, Deep Sleep mode with 20-nA current, programmable UDB-based digital logic, and dual SCB flexibility for mixed-protocol communication in space-constrained designs.

Technical Context

The device implements a single-layer AHB-Lite interconnect between Cortex-M0 CPU, SRAM, flash with read accelerator, and peripheral subsystems. Its analog subsystem includes CTBm (Capacitive Touch Block) with SmartSense™ auto-tuning, SAR ADC with channel sequencer and signal averaging, and opamps configurable as buffers, comparators, or transimpedance amplifiers.

Digital programmability centers on four Universal Digital Blocks (UDBs), each with eight macrocells and data path, enabling custom state machines or logic functions synthesized from Verilog or schematic entry. Two serial communication blocks (SCBs) support runtime reconfiguration among I²C, SPI, and UART protocols without firmware reload.

Key Specifications

Pinout & Package

Package: 48-pin TQFP (LQI suffix), 7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4245LQI-483T, CY8C4247LQI-483 offers scalable memory without altering analog/digital architecture, while STM32L432KC trades integrated programmable peripherals for raw CPU performance and memory - making the former ideal for CapSense-centric designs and the latter better suited for compute-intensive, non-touch applications.

Availability

CY8C4245LQI-483T is available at Aetrix Electronics and suitable for industrial HMI, smart sensor nodes, motor control interfaces, and medical handhelds requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for CY8C4245LQI-483T 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, delivering power systems, microcontrollers, sensors, and security solutions for automotive, industrial, and IoT markets.

This part belongs to the PSoC® 4200 product line - designed specifically to unify programmable analog, digital logic, and Arm-based control in a single chip for rapid prototyping and field-reconfigurable embedded systems.

FAQ

Does CY8C4245LQI-483T support USB connectivity?

No. This device lacks native USB PHY or controller hardware. Communication is limited to the two reconfigurable SCBs supporting I²C, SPI, and UART only. For USB host/device functionality, an external USB-to-UART bridge IC or migration to a PSoC 4 BLE or PSoC 6 device is required.

Can the CapSense functionality operate independently of the CPU?

Yes. The CapSense Sigma-Delta (CSD) block runs autonomously using dedicated hardware resources, including its own IDACs, modulator, and scan sequencer. It can perform full-button scans and generate interrupts or trigger DMA transfers without CPU intervention - even in Deep Sleep mode.

What debug interfaces are available, and can they be disabled permanently?

The device supports Serial Wire Debug (SWD) via SWDIO and SWCLK pins. Debug is enabled by default but can be disabled in firmware. Once disabled, re-enabling requires full flash erase and reprogramming. The Kill security mode permanently disables all debug access, including SWD, and cannot be reversed.

Is external crystal required for accurate timing?

No. The device includes an internal main oscillator (IMO) trimmed to ±2% accuracy at 48 MHz, sufficient for most UART and general-purpose timing. An external crystal (1–33 MHz) is optional and used only when higher precision (e.g., for USB audio or synchronous comms) or lower jitter is required.