Infineon Technologies CY8C4125AZI-M445

Overview

CY8C4125AZI-M445 from Infineon is a PSoC™ 4100M-series programmable system-on-chip integrating a 24-MHz Arm® Cortex®-M0 CPU, up to 128 kB flash and 16 kB SRAM, four low-power opamps with comparator mode, 12-bit SAR ADC (806-Ksps), and capacitive sensing (CSD) with >5:1 SNR. It targets embedded human-interface applications including touch-enabled industrial HMI, smart appliance control panels, and battery-powered sensor nodes requiring deep-sleep operation down to 20 nA.

For engineers reviewing the CY8C4125AZI-M445 datasheet, CY8C4125AZI-M445 pinout, CY8C4125AZI-M445 application, or CY8C4125AZI-M445 equivalent, key selection criteria include Deep Sleep current budget, integrated analog reconfigurability (opamp/IDAC/ADC), CAPSENSE™ water tolerance, and TCPWM kill-signal triggering for motor control safety logic.

Technical Context

The device implements a tightly coupled MCU subsystem with DMA engine and programmable interconnect enabling dynamic routing between analog peripherals (four opamps, two comparators, four IDACs) and digital resources (eight TCPWM blocks, four SCBs). Its clock system integrates IMO (24 MHz), ILO (32.768 kHz), and crystal oscillator support for precision timing across sleep/wake transitions.

Analog signal chain flexibility is enabled by per-pin configurable analog routing: opamp outputs can drive GPIOs directly, IDACs inject current into any pin for CSD, and ADC inputs accept buffered or unbuffered signals from internal or external sources - all while maintaining Deep Sleep operation at ≤20 nA with GPIO wakeup capability.

Key Specifications

Pinout & Package

Package: 44-pin TQFP (10 mm × 10 mm, 0.8 mm pitch), RoHS-compliant, industrial temperature range (–40°C to +105°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C4025AZI-S413, this part adds IDACs and doubled SRAM for richer sensor fusion; versus STM32G071KBT6, it trades raw CPU speed for on-die analog flexibility and lower active/sleep power in touch-centric designs.

Availability

CY8C4125AZI-M445 is available at Aetrix Electronics and suitable for industrial HMI panels, smart home appliance controllers, and battery-powered IoT sensors requiring stable component supply, long-term lifecycle assurance, and extended temperature operation (–40°C to +105°C).

Supply support for CY8C4125AZI-M445 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 German semiconductor manufacturer specializing in power management, automotive MCUs, and programmable mixed-signal solutions with global manufacturing and quality certification.

This device belongs to the PSoC™ 4100M product line - designed specifically for embedded human-machine interfaces requiring integrated capacitive sensing, low-power analog signal conditioning, and flexible digital peripherals in a single chip.

FAQ

Does CY8C4125AZI-M445 support hardware-based capacitive sensing without firmware intervention?

Yes - it features a dedicated Capacitive Sigma-Delta (CSD) block with automatic SmartSense tuning that performs baseline tracking, noise filtering, and threshold adaptation in hardware. Firmware only initiates scans and reads results via API; no low-level timing or calibration code is required for basic touch button operation.

What is the maximum GPIO drive strength and how is it configured?

The device supports up to 25 mA sink/source per GPIO pin in High Current mode, configurable per-pin via PSoC™ Creator or register writes. Drive strength options include 0.5 mA, 2 mA, 4 mA, 8 mA, and 25 mA; slew rate and pull-up/down resistors are also programmable to match load and EMI requirements.

Can the 12-bit SAR ADC operate during Deep Sleep mode?

No - the SAR ADC requires active CPU clocking and cannot sample in Deep Sleep. However, the device supports ADC conversions in Stop Mode (20 nA) using the low-power comparator and IDAC-based charge-transfer method for CAPSENSE™, which achieves equivalent resolution with lower power than SAR in sensing applications.

Is SWD debug interface available on all package variants of CY8C4125AZI-M445?

Yes - SWDCLK and SWDIO are assigned to fixed pins (P0[4] and P0[5]) across all package options, including the 44-pin TQFP. These pins retain debug functionality regardless of other peripheral configurations and do not require external pull-ups for standard J-Link or CMSIS-DAP programmers.