Infineon Technologies CY8C5666AXI-LP001

Overview

CY8C5666AXI-LP001 from Infineon Technologies (formerly Cypress) is a 32-bit Arm® Cortex®-M3 programmable system-on-chip (PSoC® 5LP) with up to 256 KB flash, 64 KB RAM, full CAN 2.0b interface, USB 2.0 Full-Speed peripheral, and configurable analog/digital peripherals. It operates from 1.71–5.5 V across –40 to +85 °C, supports ultra-low-power modes (300 nA hibernate), and integrates CapSense® for touch sensing in embedded control systems.

For engineers reviewing the CY8C5666AXI-LP001 datasheet, CY8C5666AXI-LP001 pinout, CY8C5666AXI-LP001 application, or CY8C5666AXI-LP001 equivalent, key selection criteria include its dual ADC architecture (delta-sigma + SAR), 24-channel DMA, DFB digital filter processor, flexible I/O routing to any peripheral, and integrated bootloader support over USB/I2C/SPI/UART.

Technical Context

The CY8C5666AXI-LP001 implements a tightly coupled mixed-signal SoC architecture where the Arm Cortex-M3 CPU (up to 80 MHz) coordinates programmable analog blocks (PGA, TIA, DAC, comparator), digital UDBs (20–24 configurable logic units), and dedicated peripherals including four TCPWM blocks, full CAN 2.0b controller with 16 Rx/8 Tx buffers, and USB 2.0 FS PHY with internal oscillator.

Its clocking subsystem includes three independent oscillators (IMO, ECO, WCO), PLL-based frequency synthesis up to 80 MHz, 12 routable clock dividers, and low-power LPO options (1/33/100 kHz). Power management supports six independent voltage domains, boost regulator (0.5–5 V), and four distinct low-power modes-Active, Sleep, Hibernate, and Deep Sleep-with retention and wake-up capability on multiple sources.

Key Specifications

Pinout & Package

The CY8C5666AXI-LP001 is housed in a 68-pin QFN package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad, compliant with JEDEC MO-220 and RoHS standards. Pin functions are fully configurable via PSoC Creator's routing engine, enabling dynamic assignment of analog/digital peripherals to any GPIO or SIO.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C5666AXI-LP001, the CY8C5868AXI-LP035 offers expanded memory and I/O for scaling firmware complexity, while the STM32F412ZGT6 trades analog integration for higher floating-point throughput and broader third-party middleware support-making each optimal for distinct architectural priorities.

Availability

CY8C5666AXI-LP001 is available at Aetrix Electronics and suitable for industrial motor control, portable medical instrumentation, automotive body electronics, and smart home HMI applications requiring stable component supply, long-term lifecycle support, and qualified automotive-grade temperature range (–40 to +85 °C).

Supply support for CY8C5666AXI-LP001 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, automotive microcontrollers, and security solutions, with global R&D and manufacturing operations.

This device belongs to the PSoC® 5LP family-designed for highly integrated, low-power embedded control applications where analog/digital configurability, rapid prototyping, and single-chip system consolidation reduce BOM cost and design cycle time.

FAQ

Does CY8C5666AXI-LP001 support USB device mode without an external crystal?

Yes. The part integrates a factory-trimmed internal main oscillator (IMO) with ±2% accuracy at 48 MHz, which meets USB 2.0 Full-Speed specification requirements for device-mode operation. This eliminates the need for an external 48-MHz crystal or oscillator, reducing BOM count and board space. USB suspend/resume timing is maintained using the 32.768-kHz watch crystal oscillator (WCO) for low-power clock recovery.

What is the maximum number of CapSense® electrodes supported on this device?

CY8C5666AXI-LP001 supports up to 62 self-capacitance or mutual-capacitance sensors using its dedicated CapSense® subsystem. Electrode count is limited by available GPIOs and routing resources-not by firmware licensing-and all sensors can be scanned simultaneously or in time-multiplexed sequences using SmartSense™ auto-tuning for robust operation across temperature and humidity variations.

Can the DFB (Digital Filter Block) operate independently of the CPU core?

Yes. The DFB is a fully autonomous 24-bit fixed-point processing unit with its own 64-word coefficient RAM and 64-word data RAM. It executes filter kernels (FIR/IIR) triggered by DMA or timer events without CPU intervention, enabling real-time signal processing such as ECG noise cancellation or motor current harmonic analysis while the Cortex-M3 handles higher-level control tasks.

Is the boost regulator capable of powering the entire chip from a single-cell Li-ion battery?

Yes. The integrated boost regulator accepts input voltages as low as 0.5 V and delivers regulated outputs up to 5.0 V, supporting full-chip operation-including analog peripherals, USB PHY, and I/O-down to ~2.8 V battery voltage. When combined with hibernate mode (300 nA), it enables multi-year operation from a single CR2032 coin cell or primary lithium battery in remote sensor applications.