Infineon Technologies CY8C4046FNI-T452T

Overview

CY8C4046FNI-T452T from Infineon is a 32-bit Arm® Cortex®-M0+ microcontroller with fifth-generation CAPSENSE™ and multi-sense HMI technology, 48 MHz CPU clock, 64 KB flash, 8 KB SRAM, and ultra-low-power Deep Sleep mode (6 µA) with hardware-accelerated "Always-on" touch sensing - deployed in wearables, hearables, and rugged IoT interfaces requiring liquid-tolerant, low-power human-machine interaction.

For engineers reviewing the CY8C4046FNI-T452T datasheet, CY8C4046FNI-T452T pinout, CY8C4046FNI-T452T application, or CY8C4046FNI-T452T equivalent, key selection criteria include its 13.5-bit ENOB capacitive sensing resolution, flyback inductive sensing support (40 kHz–5.7 MHz), dual reconfigurable SCBs for I²C/SPI/UART, TCPWM timing flexibility, and WLCSP-25 package compatibility with 0.35 mm pitch.

Technical Context

The CY8C4046FNI-T452T integrates a dedicated multi-sense converter (MSCLP) enabling ratio-metric capacitive and inductive sensing simultaneously - with autonomous channel scanning independent of CPU operation. Its CAPSENSE™ subsystem delivers >5:1 SNR and <100 aF noise floor while supporting self- and mutual-capacitance configurations across up to 16 electrodes.

It features two runtime-reconfigurable serial communication blocks (SCBs), each supporting I²C master/slave, SPI, or UART modes; two 16-bit TCPWM blocks with quadrature decode, center-aligned PWM, and comparator-triggered kill signals; and dual clock sources (±2% 48 MHz IMO + 40 kHz ILO) for precise low-power timing control.

Key Specifications

Pinout & Package

Package: 25-pin Wafer-Level Chip Scale Package (WLCSP), 0.35 mm pitch, 2.13 mm × 2.13 mm footprint, 0.49 mm height - optimized for ultra-thin wearable form factors and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-power HMI microcontroller applications.

Compared with CY8C4045FNI-DS400, the CY8C4046FNI-T452T offers double flash/SRAM and factory bootloader for seamless DFU; versus STM32L412KBU6, it delivers integrated, certified HMI sensing with lower system-level power and reduced component count.

Availability

CY8C4046FNI-T452T is available at Aetrix Electronics and suitable for smart wearables, hearables, industrial control panels, and liquid-level sensors requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.

Supply support for CY8C4046FNI-T452T 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 AG is a German semiconductor manufacturer specializing in power management, sensing, and microcontroller solutions for industrial, automotive, and IoT markets.

The PSOC™ 4000T product line was engineered specifically for ultra-low-power, liquid-tolerant human-machine interfaces - integrating fifth-generation CAPSENSE™, multi-sense converters, and Arm® Cortex®-M0+ processing in a single die to replace discrete sensor + MCU architectures.

FAQ

What is the default I²C address of the factory-installed bootloader on CY8C4046FNI-T452T?

The factory-installed I²C bootloader uses slave address 0x0C (12 decimal) with SCL/SDA mapped to P2.2 and P2.3 respectively. It operates at 400 kbps and occupies the bottom 12.5 KB of flash (0x00000000–0x00003200), leaving application space from 0x00003200 onward. The bootloader includes device-specific product ID verification to prevent cross-flashing.

Does CY8C4046FNI-T452T support both capacitive and inductive sensing simultaneously?

Yes - its multi-sense converter (MSCLP) enables concurrent capacitive and inductive sensing using separate hardware channels. Up to 16 capacitive electrodes and six inductive sensor pairs can be scanned autonomously in Deep Sleep mode without CPU intervention, as confirmed in AN239751 and the PSOC™ 4000T datasheet Section 1.5.

What is the maximum sensor excitation frequency supported for inductive sensing?

The CY8C4046FNI-T452T supports inductive sensor excitation from 40 kHz to 5.7 MHz using its flyback topology. This wide range accommodates coil inductances from 100 nH to 200 µH and enables optimization for either high-speed metal detection (e.g., 3–5 MHz) or low-power proximity (e.g., 100–500 kHz), per AN239751 design guidelines.

Can the debug interface be permanently disabled for security-critical applications?

Yes - the SWD interface can be permanently disabled via firmware configuration that locks debug access. Once disabled, re-enabling requires full chip erase (if not flash-protected), clearing protection bits, and reprogramming - providing tamper-resistant firmware security against unauthorized readout or modification, as detailed in the PSOC™ 4000T datasheet Section 6.