Infineon Technologies CY8C5667AXI-LP040

Overview

CY8C5667AXI-LP040 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, 48–72 I/O pins, full CAN 2.0b interface, and CapSense® support - designed for embedded control in industrial HMI, medical sensor nodes, and low-power IoT edge devices.

For engineers reviewing the CY8C5667AXI-LP040 datasheet, CY8C5667AXI-LP040 pinout, CY8C5667AXI-LP040 application, or CY8C5667AXI-LP040 equivalent, key selection criteria include its 80-MHz CPU performance, dual SAR + delta-sigma ADC architecture, configurable analog blocks (PGA/TIA), USB 2.0 Full-Speed capability, and ultra-low-power sleep/hibernate modes (2 µA / 300 nA).

Technical Context

The CY8C5667AXI-LP040 implements a tightly integrated mixed-signal SoC architecture centered on an Arm Cortex-M3 core running at up to 80 MHz, supported by a 24-channel DMA controller and a dedicated 24-bit digital filter processor (DFB). Its routing fabric enables dynamic assignment of analog/digital peripherals-including four TCPWM blocks, two SAR ADCs, and four opamps-to any GPIO via the Digital System Interconnect (DSI) and Analog Routing Unit (ARU).

It features six independent power domains, a boost regulator (0.5 V to 5 V), and programmable clocking with internal PLL, 32.768-kHz watch crystal support, and 12 routable clock dividers. The device supports full CAN 2.0b with 16 Rx and 8 Tx buffers, USB 2.0 Full-Speed (12 Mbps) using internal oscillator, and CapSense® for up to 62 capacitive sensors - all operating across 1.71–5.5 V and –40 to +85 °C.

Key Specifications

Pinout & Package

Package: 68-pin QFN (10 mm × 10 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 mixed-signal SoC applications.

Compared with CY8C5667AXI-LP040, CY8C5868AXI-LP039 offers expanded memory and automotive qualification at identical pinout and toolchain compatibility, while STM32F303VCT6 trades PSoC's analog/digital configurability for higher FPU throughput and broader ecosystem support - making it less suitable for sensor fusion or touch-integrated designs.

Availability

CY8C5667AXI-LP040 is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical sensor nodes, smart building occupancy sensors, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.

Supply support for CY8C5667AXI-LP040 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, sensors, microcontrollers, and security solutions for automotive, industrial, and IoT markets.

This device belongs to the PSoC® 5LP family - engineered to unify analog, digital, and programmable interconnect resources around an Arm Cortex-M3 core, targeting rapid prototyping and high-integration embedded control in resource-constrained environments.

FAQ

Does CY8C5667AXI-LP040 support USB device enumeration without external crystal?

Yes. The device integrates an internal oscillator qualified for USB 2.0 Full-Speed (12 Mbps) operation, certified under TID#10840032. It achieves ±0.25% accuracy across voltage and temperature, eliminating need for external 48-MHz crystal in most USB peripheral applications.

What is the maximum number of CapSense® electrodes supported, and how is noise immunity achieved?

CY8C5667AXI-LP040 supports up to 62 CapSense® electrodes using dedicated hardware scanning engine. Noise immunity is ensured through spread-spectrum modulation, shield-driven guard traces, and automatic baseline tracking - all implemented in hardware without CPU intervention.

Can the four opamps be used simultaneously with SAR ADC inputs?

Yes. All four opamps can operate concurrently with both 12-bit SAR ADCs. Each opamp output may be directly routed to an ADC input channel via the analog routing matrix, enabling simultaneous multi-channel signal conditioning and digitization without multiplexing delay.

Is the boost regulator capable of powering the entire chip from a single 1.8-V supply?

No. The internal boost regulator accepts input down to 0.5 V but outputs up to 5 V; however, the core logic requires minimum 1.71 V. When powered from 1.8 V, the boost regulator remains inactive - the device operates in direct-supply mode. Boost mode activates only when input falls below ~1.7 V.