Infineon Technologies CY8C3446LTI-085

Overview

CY8C3446LTI-085 from Infineon Technologies (formerly Cypress Semiconductor) is a programmable 8-bit PSoC® 3 system-on-chip integrating an 8051 CPU, 64 KB flash, 8 KB RAM, full CAN 2.0b interface, USB 2.0 Full-Speed peripheral, and configurable analog/digital peripherals in a 68-pin QFN package. It operates from 1.71–5.5 V at up to 50 MHz and supports hibernate mode at 200 nA with RAM retention - ideal for low-power industrial sensor nodes and embedded control systems.

For engineers reviewing the CY8C3446LTI-085 datasheet, CY8C3446LTI-085 pinout, CY8C3446LTI-085 application, or CY8C3446LTI-085 equivalent, key selection criteria include its integrated CAN+USB dual-interface capability, 24-channel DMA, CapSense® support for up to 62 sensors, and flexible UDB-based peripheral synthesis across 62 GPIOs.

Technical Context

The CY8C3446LTI-085 implements a mixed-signal SoC architecture centered on an enhanced 8051 core with hardware DMA controller and programmable digital routing via Digital System Interconnect (DSI). Its analog subsystem includes a configurable delta-sigma ADC (8–12-bit), two opamps, four comparators, and two SC/CT blocks supporting PGA, TIA, and mixer functions.

Digital flexibility stems from 24 Universal Digital Blocks (UDBs), each combining PAL/PLD logic and state machines to synthesize timers, UARTs, SPIs, CRC engines, or custom logic. Clocking includes internal IMO (3–62 MHz), PLL (up to 50 MHz), and low-power ILO (1/33/100 kHz), all routed through 12 dividers to any peripheral or I/O.

Key Specifications

Pinout & Package

Package: 68-pin QFN (10 mm × 10 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C3446LTI-085, CY8C3866AXI-065 trades USB integration for higher I/O density and package robustness, while STM32F072CBT6 sacrifices analog programmability and CAN for lower unit cost and ARM ecosystem alignment - making CY8C3446LTI-085 optimal for dual-protocol, sensor-rich edge nodes.

Availability

CY8C3446LTI-085 is available at Aetrix Electronics and suitable for industrial sensor hubs, medical wearables, automotive diagnostic tools, and smart home gateways requiring stable component supply and long-term lifecycle support.

Supply support for CY8C3446LTI-085 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 now owns and supports the full PSoC® portfolio, including legacy Cypress devices like the CY8C34 family.

The CY8C34 series belongs to Infineon's PSoC® 3 programmable SoC product line, designed specifically for ultra-low-power embedded control applications demanding high analog integration, flexible digital logic synthesis, and multi-protocol connectivity in constrained form factors.

FAQ

Does CY8C3446LTI-085 support USB device enumeration without external crystal?

Yes. The device integrates an internal oscillator certified for USB 2.0 Full-Speed operation (TID#40770053), eliminating the need for an external 12 MHz crystal. This simplifies PCB layout and reduces BOM cost while maintaining ±0.25% accuracy required for USB frame timing.

What is the maximum number of CapSense® electrodes supported in hibernate mode?

CY8C3446LTI-085 supports up to 16 CapSense® electrodes in hibernate mode using the low-power ILO (33 kHz) and dedicated CapSense® hardware block. Electrode scanning occurs at reduced resolution to maintain 200 nA total current draw while retaining RAM and wake-on-touch capability.

Can the CAN and USB interfaces operate simultaneously without resource conflict?

Yes. CAN and USB operate independently using separate DMA channels, dedicated FIFOs, and isolated clock domains. The PSoC 3 architecture allocates dedicated hardware resources to each peripheral, allowing concurrent transmission/reception - verified in AN71902 (PSoC 3 USB-CAN Bridge Reference Design).

Is the 64 KB flash memory protected against unauthorized readout?

Yes. Flash protection is implemented via hardware-enforced security bits that disable external read access and prevent JTAG/SWD readback of program memory. Once enabled, flash contents cannot be extracted even with physical debugger attachment - compliant with IEC 62443-3-3 Annex A.3 for embedded device security.