Infineon Technologies CY8C4125LQI-483T

Overview

CY8C4125LQI-483T from Infineon Technologies (formerly Cypress Semiconductor) is a 32-bit Arm® Cortex™-M0 programmable system-on-chip (PSoC® 4100 family) with 32 kB flash, 4 kB SRAM, 12-bit 806 ksps SAR ADC, two opamps, and two low-power comparators. It operates from 1.71 V to 5.5 V and supports Hibernate, Deep Sleep, and Stop modes down to 20 nA. Used in capacitive touch HMI, sensor interface, and industrial control edge nodes.

For engineers reviewing the CY8C4125LQI-483T datasheet, CY8C4125LQI-483T pinout, CY8C4125LQI-483T application, or CY8C4125LQI-483T equivalent, key selection criteria include its integrated CapSense Sigma-Delta (CSD) engine, reconfigurable analog/digital blocks, SWD debug interface, and 48-pin TQFP package with 36 GPIOs supporting LCD drive and capacitive sensing on any pin.

Technical Context

The device implements a single-layer AHB-Lite bus architecture connecting the Cortex-M0 CPU, SRAM, flash with read accelerator, and peripheral interconnect. Its analog subsystem includes a configurable CTBm block hosting two opamps (with comparator/ADC buffer modes), one 12-bit SAR ADC with channel sequencer and signal averaging, and two IDACs for capacitive sensing or analog output.

Digital resources comprise four TCPWM blocks supporting center-aligned PWM, pseudo-random modulation, and comparator-triggered kill signals; two SCBs configurable as I²C/SPI/UART; and a programmable digital system interconnect (DSI) enabling hardware-level routing between analog, digital, and timing peripherals without CPU intervention.

Key Specifications

Pinout & Package

Package: 48-pin TQFP (LQI), 7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad (EP). RoHS-compliant, lead-free, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4125LQI-483T, CY8C4014LQI-422 sacrifices CapSense and flash capacity for lower unit cost, while STM32F072RBT6 trades analog programmability and deep-sleep efficiency for greater memory headroom and ecosystem tooling - making CY8C4125LQI-483T optimal for compact, sensor-rich, ultra-low-power HMI designs.

Availability

CY8C4125LQI-483T is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor nodes, motor control interfaces, and medical diagnostic handhelds requiring stable component supply and long-term manufacturability.

Supply support for CY8C4125LQI-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 management, sensing, connectivity, and microcontroller solutions for automotive, industrial, and IoT markets.

This device belongs to the PSoC® 4100 family - a mixed-signal programmable SoC platform designed for embedded applications demanding integrated analog signal conditioning, capacitive touch, low-power operation, and flexible digital logic reconfiguration in space-constrained designs.

FAQ

Does CY8C4125LQI-483T support USB connectivity?

No. This part lacks a USB physical layer (PHY) and dedicated USB controller. Communication is limited to the two SCB blocks, configurable as I²C, SPI, or UART only. For USB-capable PSoC 4 variants, consider CY8C4247LQI-M485 or later PSoC 4 BLE/4000 series devices with integrated USBFS blocks.

Can the on-chip opamps drive external loads directly?

Yes - each opamp supports high-drive external mode (up to ±25 mA sink/source) and can directly drive resistive or capacitive loads such as LCD segments, LED drivers, or sensor excitation circuits. Internal high-bandwidth mode is reserved for ADC buffering and signal conditioning within the analog subsystem.

What debug interfaces are available and how are they enabled?

The device features a two-wire Serial Wire Debug (SWD) interface on P0[4] (SWDIO) and P0[5] (SWDCK). Debug is enabled by default after reset and can be disabled in firmware via the CPUSS_SYSREQ register. Re-enabling requires full flash erase and reprogramming - no backdoor access exists once debug is locked.

Is the 48-pin TQFP package RoHS-compliant and halogen-free?

Yes. The LQI package designation indicates lead-free, RoHS-compliant construction with halogen-free molding compound per IEC 61249-2-21. Moisture sensitivity level is MSL3, requiring bake condition per J-STD-020 prior to reflow if exposed beyond floor life.