Infineon Technologies CY8C4A45FNI-483T

Overview

CY8C4A45FNI-483T from Infineon Technologies (formerly Cypress) is a programmable 32-bit Arm® Cortex™-M0+ analog coprocessor with 32 KB flash, 4 KB SRAM, and integrated analog front-end including dual ADCs (12-bit SAR + 10-bit single-slope), UAB-based filter/ADC/DAC, four opamps, two low-power comparators, and CapSense® sigma-delta capacitive sensing. It targets sensor aggregation and preprocessing in battery-powered industrial and IoT edge nodes.

For engineers reviewing the CY8C4A45FNI-483T datasheet, CY8C4A45FNI-483T pinout, CY8C4A45FNI-483T application, or CY8C4A45FNI-483T equivalent, key selection criteria include Deep-Sleep analog retention (2.5 µA system current), 38-channel analog mux support, Smart I/O Boolean logic capability, and WCO-backed timing stability for sensor synchronization.

Technical Context

The device implements a tightly coupled signal processing architecture where the Cortex-M0+ core (up to 48 MHz) offloads host MCU tasks by executing preconfigured analog data acquisition sequences via hardware-accelerated peripherals - including descriptor-based DMA transfers between SAR ADC output and SRAM, and UAB-based incremental delta-sigma conversion independent of CPU cycles.

Analog subsystem operation is decoupled from digital power domains: opamps and comparators remain functional in Deep-Sleep mode while digital logic clocks are gated, enabling continuous sensor monitoring with sub-µA analog biasing and wake-on-event triggering via WIC-integrated interrupt routing.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pin mapping validated per CY8C4Axx Family Datasheet Rev. *J, pages 10–12.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog coprocessor applications.

Compared with STM32L4A6VGT6 and MAX32660, CY8C4A45FNI-483T uniquely integrates programmable analog hardware (UAB, opamps, comparators) with CapSense and Smart I/O - enabling single-chip sensor preprocessing without external components or firmware-intensive signal conditioning.

Availability

CY8C4A45FNI-483T is available at Aetrix Electronics and suitable for industrial sensor hubs, capacitive touch interfaces, portable medical monitors, and smart energy metering requiring stable component supply and long-term lifecycle support.

Supply support for CY8C4A45FNI-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 acquired Cypress Semiconductor in 2020 and maintains full product continuity, documentation, and support for the PSoC portfolio.

The CY8C4Axx family belongs to Infineon's PSoC Analog Coprocessor product line, designed specifically to reduce host MCU workload in multi-sensor embedded systems through hardware-accelerated analog signal acquisition, filtering, and capacitive sensing.

FAQ

What is the maximum operating frequency of the Arm Cortex-M0+ core in CY8C4A45FNI-483T?

The CY8C4A45FNI-483T operates its Arm Cortex-M0+ CPU at up to 48 MHz, verified under 1.71–5.5 V supply and industrial temperature range (–40 °C to +85 °C). This frequency is sustained using the internal IMO (Internal Main Oscillator) with optional PLL multiplication, and supports deterministic real-time execution of sensor fusion algorithms with sub-microsecond interrupt response.

Does CY8C4A45FNI-483T support hardware-based capacitive sensing without external components?

Yes - it integrates fourth-generation CapSense® sigma-delta (CSD) hardware with dedicated modulator and IDACs, enabling self-capacitance and mutual-capacitance touch sensing on any GPIO pin. No external RC networks or dedicated touch controllers are required, and SmartSense™ auto-tunes sensitivity and baseline in real time without firmware intervention.

Can the analog peripherals remain active during Deep-Sleep mode?

Yes - opamps, comparators, and the UAB can operate continuously in Deep-Sleep mode while CPU, flash, and SRAM are powered down. The device draws only 2.5 µA total system current in this state, and analog events (e.g., comparator threshold crossing) trigger wake-up via the Wakeup Interrupt Controller (WIC) within 35 µs.

Is the SWD debug interface permanently enabled on CY8C4A45FNI-483T?

No - the Serial Wire Debug (SWD) interface is enabled by default at factory but can be disabled permanently via firmware configuration. Once disabled and flash protection is set, re-enabling debug requires full chip erase, providing hardware-enforced security against unauthorized access or firmware extraction.