Infineon Technologies CY8C3866AXI-055

Overview

CY8C3866AXI-055 from Cypress Semiconductor is a programmable system-on-chip (PSoC® 3) integrating an 8051 CPU core, up to 64 KB flash, 8 KB SRAM, 2 KB EEPROM, 24-channel DMA, and configurable analog/digital peripherals including delta-sigma ADC (20-bit, 192 ksps), four opamps, four comparators, and full CAN 2.0b interface - deployed in industrial sensor hubs and embedded control systems requiring mixed-signal flexibility and firmware-upgradable functionality.

For engineers reviewing the CY8C3866AXI-055 datasheet, CY8C3866AXI-055 pinout, CY8C3866AXI-055 application, or CY8C3866AXI-055 equivalent, key selection criteria include its 48-pin SSOP package, –40°C to +85°C industrial temperature rating, 67 MHz max CPU clock, 1.71–5.5 V analog supply range, and support for CapSense®, USB 2.0 FS, and programmable digital logic via UDB array.

Technical Context

The CY8C3866AXI-055 implements a single-cycle 8051 microcontroller core with AMBA AHB bus architecture, supporting up to 67 MHz operation via internal PLL and crystal oscillator options (4–33 MHz). Its digital subsystem centers on 24 universal digital blocks (UDBs) enabling reconfigurable logic, timers, PWMs, I²C, UART, SPI, LIN, and quadrature decoding without external components.

Analog subsystem integration includes a 1.024 V ±0.1% voltage reference, delta-sigma ADC with programmable gain (×0.25–×16), 12-bit/192 ksps or 16-bit/48 ksps modes, and four SC/CT blocks configurable as PGA, TIA, mixer, or sample-and-hold - all routable to any of 62 GPIO pins with independent I/O voltage domains (1.2–5.5 V).

Key Specifications

Pinout & Package

Package: 48-pin SSOP (Small Outline Integrated Circuit), 0.635 mm pitch, body size 15.4 mm × 7.6 mm, RoHS-compliant, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XMC4500-F100K1024 AC and PIC18F87J90, CY8C3866AXI-055 uniquely combines 8051 determinism, analog configurability, and sub-µA power states - making it optimal for battery-constrained, sensor-rich edge nodes needing firmware-upgradable mixed-signal functionality.

Availability

CY8C3866AXI-055 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, portable medical monitors, and smart home thermostats requiring stable component supply across extended product lifecycles.

Supply support for CY8C3866AXI-055 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable embedded solutions, memory, and connectivity products for industrial, automotive, and consumer markets.

CY8C3866AXI-055 belongs to the PSoC® 3 family - designed to unify analog signal acquisition, digital processing, and system control in a single reconfigurable chip for rapid prototyping and last-minute design iteration without PCB respins.

FAQ

Does CY8C3866AXI-055 support USB device functionality without external crystal?

Yes. The device integrates a full-speed USB 2.0 PHY and can operate at 12 Mbps using its internal oscillator - eliminating the need for an external 48 MHz crystal or oscillator in USB device applications. Internal trimming ensures ±0.25% accuracy over voltage and temperature, meeting USB specification requirements for device-mode operation.

What is the maximum operating frequency of the delta-sigma ADC in 16-bit mode?

In 16-bit resolution mode, the delta-sigma ADC achieves a maximum sample rate of 48 ksps while maintaining 84 dB SINAD and ±2 LSB INL. This performance is guaranteed across the full industrial temperature range (–40°C to +85°C) with VDDA ≥ 1.71 V, enabling high-fidelity acquisition of slow-to-medium bandwidth sensor signals.

Can all 62 GPIO pins be used simultaneously for analog input acquisition?

No. While all 62 GPIO pins are *routable* to the analog subsystem, simultaneous use is constrained by analog bus bandwidth and SAR/SC conversion timing. The delta-sigma ADC supports up to 24 independent analog input channels via multiplexed sampling, with channel switching latency under 1 µs - sufficient for multi-sensor polling but not true parallel acquisition.

Is the 200 nA hibernate mode retained after power cycle or only during deep sleep?

The 200 nA hibernate mode retains SRAM contents and selected register states but does *not* retain full device configuration across power cycles. Upon wake-up from hibernate, the device executes a full reset sequence - meaning firmware must reinitialize peripherals and restore context from retained RAM. Power-cycle retention requires external nonvolatile storage or EEPROM-backed state save.