Infineon Technologies CY8C3446AXI-099

Overview

CY8C3446AXI-099 from Infineon Technologies (formerly Cypress Semiconductor) is a programmable 8-bit PSoC® 3 system-on-chip integrating an 8051 CPU, configurable analog/digital peripherals, 64 KB flash, 8 KB RAM, and full CAN 2.0b interface. It operates from 1.71–5.5 V at up to 50 MHz, supports CapSense® for touch interfaces, and delivers ultra-low-power operation down to 200 nA in hibernate mode with RAM retention. Used in industrial HMI, medical sensor nodes, and automotive body control modules.

For engineers reviewing the CY8C3446AXI-099 datasheet, CY8C3446AXI-099 pinout, CY8C3446AXI-099 application, or CY8C3446AXI-099 equivalent, key selection criteria include its integrated CAN 2.0b controller with 16 Rx/8 Tx buffers, programmable UDB array for custom logic synthesis, 12-bit delta-sigma ADC with CapSense support, and dual opamps with PGA/TIA configuration capability.

Technical Context

The CY8C3446AXI-099 implements a hard 8051 CPU core with DMA controller and 32 interrupt inputs, enabling deterministic real-time control. Its digital subsystem uses 24 universal digital blocks (UDBs) that can be configured as UART, SPI, LIN, CRC, quadrature decoders, or gate-level logic - all routed flexibly via the Digital System Interconnect (DSI).

Analog functionality includes two programmable SC/CT blocks supporting transimpedance amplifier (TIA), programmable gain amplifier (PGA), mixer, and sample-and-hold circuits, plus a configurable 8–12-bit delta-sigma ADC and two 8-bit DACs. The device supports four independent power domains and voltage scaling from 1.2 V to 5.5 V per I/O bank.

Key Specifications

Pinout & Package

Package: 68-pin QFN (9 mm × 9 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable SoC applications.

Compared with CY8C3446AXI-099, CY8C3866AXI-099 offers scalable memory/UDB headroom without changing design, while STM32F072CBT6 trades integrated analog flexibility for lower silicon cost and ARM ecosystem alignment - making it viable only when CapSense, PGA, or UDB-based logic synthesis are unnecessary.

Availability

CY8C3446AXI-099 is available at Aetrix Electronics and suitable for industrial HMI panels, medical sensor nodes, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for CY8C3446AXI-099 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 industrial, automotive, and IoT applications.

The CY8C34 family belongs to Infineon's PSoC® 3 programmable SoC product line, designed specifically for embedded applications demanding high analog/digital integration, ultra-low-power operation, and rapid firmware-driven customization without ASIC development.

FAQ

Does CY8C3446AXI-099 support USB device enumeration without external crystal?

Yes. The device integrates an internal oscillator qualified for USB Full-Speed (12 Mbps) operation, certified under TID#40770053. It achieves ±0.25% accuracy over temperature and voltage, eliminating the need for an external 12 MHz crystal in USB applications - reducing BOM count and PCB footprint.

What is the maximum operating frequency of the 8051 core in CY8C3446AXI-099?

The 8051 CPU core runs at up to 50 MHz, enabled by an internal PLL that multiplies the 3–62 MHz IMO or external crystal input. At 50 MHz, instruction throughput reaches 25 MIPS, with single-cycle execution for most instructions and deterministic interrupt latency critical for real-time control loops.

Can the CapSense functionality operate independently of the CPU?

Yes. CapSense scanning is managed by dedicated hardware (CSD block) with autonomous operation during sleep modes. The CPU remains in low-power state while the CSD block performs sensor scans, generates interrupts on threshold crossing, and stores raw counts in dedicated registers - enabling true touch wake-up from 1 µA sleep mode.

Is the CAN controller compatible with ISO 11898-2 physical layer requirements?

No. The CY8C3446AXI-099 contains only the CAN protocol controller (MAC layer); it requires an external CAN transceiver (e.g., Infineon TLE6250 or TI SN65HVD230) to meet ISO 11898-2 electrical specifications. The CAN_TX/CAN_RX pins provide CMOS-level signals compliant with CiA DSP-203-1 logical interface standards.