Infineon Technologies CY8C29666-24LTXI

Overview

CY8C29666-24LTXI from Infineon Technologies (formerly Cypress Semiconductor) is a PSoC® 1 programmable system-on-chip integrating an M8C 8-bit Harvard-architecture CPU, 32 KB flash, 2 KB SRAM, and configurable analog/digital blocks. It operates at up to 24 MHz with ±5% internal oscillator accuracy, supports 3.0–5.25 V supply (or down to 1.0 V via on-chip switch-mode pump), and targets industrial embedded control requiring mixed-signal integration in a single chip.

For engineers reviewing the CY8C29666-24LTXI datasheet, CY8C29666-24LTXI pinout, CY8C29666-24LTXI application, or CY8C29666-24LTXI equivalent, key selection criteria include its 12 analog PSoC blocks (supporting up to 14-bit ADCs and 9-bit DACs), 16 digital PSoC blocks (enabling 8–32-bit timers, UARTs, SPI, and I²C), flexible GPIO drive modes, and EEPROM emulation in flash - all validated for operation across –40 °C to +85 °C.

Technical Context

The CY8C29666-24LTXI implements a fixed-function M8C core with interrupt controller (17 vectors), sleep/watchdog timers, and programmable clock sources including a 24 MHz internal main oscillator (IMO), 32 kHz internal low-speed oscillator (ILO), and optional 32.768 kHz external crystal oscillator (ECO) with PLL for crystal-accurate 24 MHz generation.

Analog resources include rail-to-rail PSoC blocks supporting decimator-based ADCs (up to 14-bit), DACs (up to 9-bit), PGAs, and comparators; digital resources provide 8–32-bit counters/timers, PWMs with dead-band, CRC/PRS modules, and up to four full-duplex UARTs - all routed via global digital/analog interconnects to eight I/O ports.

Key Specifications

Pinout & Package

Package: 48-pin QFP (LQFP-48), 7 mm × 7 mm, 0.5 mm pitch, RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C29466-24LTXI, CY8C29666-24LTXI provides double flash/SRAM and expanded analog/digital resources for larger firmware and richer mixed-signal functionality; versus CY8C29866-24LTXI, it omits on-chip debug hardware - trading debug depth for lower unit cost in volume production.

Availability

CY8C29666-24LTXI is available at Aetrix Electronics and suitable for motor control interfaces, industrial sensor hubs, smart power metering, and capacitive touch HMIs requiring stable component supply across industrial temperature ranges and long-term lifecycle support.

Supply support for CY8C29666-24LTXI 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 specializing in power management, automotive, industrial, and IoT solutions, with broad portfolio coverage from discrete devices to complex SoCs.

CY8C29666-24LTXI belongs to the PSoC® 1 family - designed specifically for cost-effective, highly integrated mixed-signal embedded control where analog signal conditioning, digital logic, and programmable interconnect must coexist on a single chip without external glue logic.

FAQ

What development tools are required to program and debug CY8C29666-24LTXI?

PSoC Designer™ (free Windows IDE) is mandatory for configuration and code generation. Programming and debugging require MiniProg3 or compatible SWD programmer; MiniProg1 is not supported for this device. The IDE provides drag-and-drop peripheral configuration, auto-generated APIs, and full-speed emulation with 128 KB trace memory when used with CY8C29866, though CY8C29666 supports ISSP and basic debug via SWD.

Does CY8C29666-24LTXI support crystal-accurate real-time clock functionality?

Yes - it supports a 32.768 kHz external crystal oscillator (ECO) connected to XIN/XOUT pins. This crystal can serve directly as a low-power RTC source or feed a PLL to generate a crystal-accurate 24 MHz system clock, enabling precise timekeeping and deterministic timing for communication protocols like UART or I²C.

Can CY8C29666-24LTXI operate below 3.0 V, and how is analog performance affected?

Yes - it operates down to 1.0 V using the integrated switch-mode pump (SMP). At sub-3.0 V, analog block performance is maintained via internal voltage regulation; however, maximum ADC resolution degrades from 14-bit to 12-bit below 2.7 V, and PGA gain accuracy decreases above ±10% at 1.8 V per datasheet Section 22.2 (DC Electrical Characteristics).

How many UARTs does CY8C29666-24LTXI support, and are they hardware or software implemented?

CY8C29666-24LTXI supports up to four full-duplex UARTs implemented in dedicated digital PSoC blocks - not bit-banged in firmware. Each UART has independent baud rate generators, FIFO buffers, and hardware flow control support, enabling concurrent serial communication on separate GPIO pins without CPU overhead.