Infineon Technologies CY8C29666-24PVXI

Overview

CY8C29666-24PVXI from Infineon Technologies (formerly Cypress Semiconductor) is a programmable mixed-signal System-on-Chip (PSoC 1) featuring an M8C 8-bit Harvard-architecture CPU running at up to 24 MHz, 32 KB flash, 2 KB SRAM, and configurable analog/digital blocks. It operates from 3.0 V to 5.25 V (or down to 1.0 V with on-chip switch-mode pump), supports industrial temperature range (–40 °C to +85 °C), and integrates up to four UARTs, multiple PWMs, and 12 analog PSoC blocks - used in embedded motor control, sensor interface, and industrial HMI systems.

For engineers reviewing the CY8C29666-24PVXI datasheet, CY8C29666-24PVXI pinout, CY8C29666-24PVXI application, or CY8C29666-24PVXI equivalent, key selection criteria include its 24 MHz M8C core timing accuracy (±5% IMO), 25-mA GPIO sink capability, 14-bit ADC support via decimator, EEPROM emulation in flash, and flexible analog routing across eight standard GPIO pins.

Technical Context

The CY8C29666-24PVXI implements a fixed-function digital system built from 16 reconfigurable 8-bit digital PSoC blocks, enabling user-defined peripherals such as 8–32-bit timers, PWMs with dead-band, CRC/PRS modules, and up to two full-duplex UARTs. Its analog system comprises 12 rail-to-rail analog PSoC blocks supporting programmable gain amplifiers, comparators, filters, and up to 14-bit sigma-delta ADCs using internal decimation.

Clock architecture includes a ±5% internal main oscillator (IMO) at 24/48 MHz, optional 32.768 kHz crystal input for RTC or PLL-based 24 MHz generation, and a low-power 32 kHz internal low-speed oscillator (ILO) for sleep/WDT. Memory subsystem features 32 KB flash with 50,000 erase/write cycles, 2 KB SRAM, and EEPROM emulation with block-level protection.

Key Specifications

Pinout & Package

CY8C29666-24PVXI is housed in a 28-pin plastic DIP (dual in-line package) with 0.6-inch body width and 0.1-inch pin pitch. Pin assignments are defined for Port 0 through Port 7, with dedicated analog inputs (AN0–AN7), digital I/O (P0[0]–P7[7]), clock inputs (XIN/XOUT), reset (RESET), and power (VDD/VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C29466-24PVXI, the CY8C29666-24PVXI adds four analog and four digital blocks for richer mixed-signal integration; versus CY8C29866-24PVXI, it omits automotive qualification but offers identical functionality at lower unit cost for industrial use.

Availability

CY8C29666-24PVXI is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, human-machine interface panels, and smart meter front-ends requiring stable component supply, long-term lifecycle support, and legacy PSoC 1 design continuity.

Supply support for CY8C29666-24PVXI 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 maintains full product continuity, technical support, and manufacturing for the PSoC portfolio - combining Cypress's programmable analog/digital expertise with Infineon's power and sensing leadership.

CY8C29666-24PVXI belongs to the PSoC 1 family, designed specifically for cost-sensitive, low-power embedded systems requiring configurable mixed-signal integration without external peripherals - targeting industrial control, appliance, and metering applications.

FAQ

Is CY8C29666-24PVXI pin-compatible with other CY8C29x66 devices?

Yes - all CY8C29x66 variants in the 28-pin PDIP package (including CY8C29466, CY8C29566, CY8C29666, and CY8C29866) share identical pinouts and footprint. This allows drop-in replacement during prototyping or qualification, provided firmware and analog/digital resource usage align with the target device's block count.

Does CY8C29666-24PVXI support in-system programming (ISP)?

Yes - it supports In-System Serial Programming (ISSP) via dedicated pins (SDA, SCL, RESET, and VDD) using MiniProg1 or MiniProg3 programmers. ISSP enables field firmware updates without removing the device from the PCB and supports partial flash reprogramming for efficient patch deployment.

What development tools are required for CY8C29666-24PVXI?

PSoC Designer™ (free Windows IDE) is the official development environment, providing drag-and-drop user module configuration, automatic API generation, and full-speed in-circuit emulation with 128 KB trace memory. Required hardware includes MiniProg3 for programming/debugging and evaluation kits like CY3210-PSoCEval1 for rapid prototyping.

Can CY8C29666-24PVXI operate from a single 3.3 V supply?

Yes - it is fully specified for 3.0 V to 5.25 V operation, including stable 3.3 V operation. At 3.3 V, the M8C core runs reliably at 24 MHz, all GPIOs deliver 25 mA sink, and analog blocks maintain rail-to-rail performance - making it ideal for 3.3 V industrial bus-powered systems.