Infineon Technologies CY8C5866AXI-LP021

Overview

CY8C5866AXI-LP021 from Infineon Technologies (formerly Cypress) is a 32-bit Arm Cortex-M3-based programmable system-on-chip (PSoC® 5LP) with up to 256 KB flash, 64 KB RAM, 46–72 GPIOs, full CAN 2.0b interface, and integrated CapSense® for touch sensing. It operates from 1.71 V to 5.5 V across –40 °C to 85 °C ambient, supporting ultra-low-power modes including 300 nA hibernate with RAM retention. Used in industrial HMI, medical sensor hubs, and automotive body control modules requiring mixed-signal reconfigurability.

For engineers reviewing the CY8C5866AXI-LP021 datasheet, CY8C5866AXI-LP021 pinout, CY8C5866AXI-LP021 application, or CY8C5866AXI-LP021 equivalent, key selection criteria include its dual ADC architecture (delta-sigma + SAR), USB Full-Speed peripheral support, configurable UDB array for custom logic, and 80 MHz deterministic real-time performance with DMA and DFB acceleration.

Technical Context

The CY8C5866AXI-LP021 implements a tightly coupled mixed-signal SoC architecture where the Arm Cortex-M3 core (80 MHz max) interfaces directly with a digital subsystem of 20–24 universal digital blocks (UDBs), a 24-channel DMA controller, and a 24-bit 64-tap digital filter processor (DFB). Its routing fabric enables any analog or digital peripheral function to be assigned to any GPIO via the Digital System Interconnect (DSI) and Analog Routing Unit (ARU).

Analog resources include a configurable 8–20-bit delta-sigma ADC, two 12-bit SAR ADCs, four opamps, four comparators, four 8-bit DACs, and four programmable SC/CT blocks supporting PGA, TIA, mixer, and sample-and-hold functions. Clocking supports internal oscillators (IMO, ILO), external crystals (4–25 MHz, 32.768 kHz), PLL up to 80 MHz, and 12 routable clock dividers.

Key Specifications

Pinout & Package

This device is packaged in a 68-pin QFN (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are defined by user-configurable routing - all digital and analog peripherals can be mapped to any GPIO or SIO pin via PSoC Creator's hardware design environment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C5867AXI-LP023, the LP021 trades guaranteed 80 MHz operation for lower cost and same feature set; versus STM32F303VCT6, it provides true hardware configurability for analog front-ends and protocol offload - reducing firmware complexity and external component count.

Availability

CY8C5866AXI-LP021 is available at Aetrix Electronics and suitable for industrial HMI panels, medical sensor hubs, and automotive body control modules requiring stable component supply, long-term lifecycle support, and qualified automotive-grade packaging.

Supply support for CY8C5866AXI-LP021 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, delivering high-reliability semiconductor solutions for automotive, industrial, and IoT markets.

The CY8C58LP family was designed as a scalable, ultra-low-power programmable SoC platform targeting applications needing both high-performance ARM processing and flexible analog/digital hardware customization - especially where rapid prototyping and hardware reuse are critical.

FAQ

Does CY8C5866AXI-LP021 support USB device enumeration without external crystal?

Yes. The device integrates a factory-trimmed internal oscillator (IMO) with ±1% accuracy at 3 MHz, which feeds the USB PLL to generate precise 48 MHz clock required for Full-Speed USB 2.0 compliance. No external crystal is needed for basic USB peripheral operation, though an external 32.768 kHz crystal improves RTC accuracy and low-power timing stability.

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

The CY8C5866AXI-LP021 supports up to 62 self-capacitance or mutual-capacitance electrodes using its dedicated CapSense® CSD block and IDACs. Electrode count is limited by routing resources and scan time - full 62-electrode operation requires careful pin assignment and firmware optimization to maintain <100 ms total scan time at 10-bit resolution.

Can the digital filter processor (DFB) operate independently of the CPU core?

Yes. The DFB is a fully autonomous 24-bit fixed-point processor with its own 64-tap coefficient memory and data RAM. It can execute FIR/IIR filters, FFT-like transforms, or custom arithmetic sequences triggered by DMA or peripheral events - freeing the Cortex-M3 core for higher-level tasks while maintaining deterministic 80 MHz throughput.

Is the 300 nA hibernate current measured with all memory retained?

Yes. The 300 nA specification (per datasheet section 11.2) is measured with 64 KB SRAM fully retained, real-time clock (RTC) running from the 32.768 kHz watch crystal, and brown-out detection enabled. This mode preserves full context for instant wake-up, and is validated across the full –40 °C to 85 °C temperature range with 1.71 V supply.