Infineon Technologies CY8C29666-24LFXI

Overview

CY8C29666-24LFXI from Cypress Semiconductor is a programmable PSoC® System-on-Chip integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 16 digital PSoC blocks, 12 analog PSoC blocks, 16 KB flash, 2 KB SRAM, and configurable GPIOs with 25 mA sink capability - used in embedded control systems requiring mixed-signal reconfigurability, such as motor control feedback loops and sensor signal conditioning.

For engineers reviewing the CY8C29666-24LFXI datasheet, CY8C29666-24LFXI pinout, CY8C29666-24LFXI application, or CY8C29666-24LFXI equivalent, key selection criteria include its 24 MHz IMO clock accuracy (±2.5%), on-chip switch-mode pump for 1.0 V operation, 14-bit ADC support, I²C master/slave capability up to 400 kHz, and 48-pin LQFP package with 44 GPIOs.

Technical Context

The device implements a configurable mixed-signal architecture where digital blocks (8-bit units) combine into 8–32-bit peripherals including UARTs, SPI, PWMs with dead-band, CRC, and PRS generators - all routed via global digital interconnect to any GPIO. Analog blocks support SAR/delta-sigma ADCs (up to 14-bit), 9-bit DACs, PGAs (gain up to 48×), and programmable filters.

Clocking includes a ±2.5% 24 MHz internal main oscillator (IMO), optionally doubled to 48 MHz via PLL, plus a 32.768 kHz ECO input for RTC and crystal-accurate system timing. The integrated switch-mode pump enables operation down to 1.0 V supply while maintaining full functionality.

Key Specifications

Pinout & Package

This device is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with 44 general-purpose I/O pins, 2 power supply pins (VDD, VSS), 1 reset (XRES), and 1 debug interface pin (SWDIO). All GPIOs support eight drive modes including strong, open-drain, pull-up/down, and high-Z.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C29466-24LFXI, this part adds 6 analog and 8 digital blocks for complex signal processing; compared with CY8C29866-24LFXI, it trades 24 GPIOs for smaller footprint and lower cost - ideal for space-constrained industrial controllers needing full analog capability.

Availability

CY8C29666-24LFXI is available at Aetrix Electronics and suitable for industrial motor control, portable medical instrumentation, smart energy monitoring, and automotive body electronics requiring stable component supply and long-term obsolescence management.

Supply support for CY8C29666-24LFXI 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) designs programmable mixed-signal ICs for embedded control, offering PSoC architecture since 2002 with focus on configurability and system integration.

The CY8C29x66 product line targets cost-sensitive, space-constrained embedded applications requiring both precision analog signal processing and flexible digital control - especially where rapid prototyping and firmware-driven peripheral reconfiguration reduce development time.

FAQ

What development tools are required to program CY8C29666-24LFXI?

PSoC Designer™ IDE (discontinued but fully supported for CY8C29x66) is required for schematic-based design, automatic code generation, and configuration of analog/digital blocks. Programming uses ISSP protocol via MiniProg1 or compatible programmers; no external debugger is needed as SWDIO enables full-speed in-circuit emulation with 128 KB trace memory.

Does CY8C29666-24LFXI support true 14-bit ADC resolution?

Yes - the device supports 14-bit SAR ADC mode with typical INL of ±1 LSB and ENOB ≥13.2 bits at 100 kSPS, confirmed in Electrical Specifications section of datasheet 38-12013 Rev. *P. Resolution is achieved using internal 1.3 V reference and programmable gain amplifier front-end with selectable input ranges.

Can the switch-mode pump (SMP) power the entire chip at 1.0 V?

Yes - the integrated SMP generates a regulated 3.3 V internal supply from 1.0–1.2 V battery input, enabling full operation including CPU, flash programming, analog blocks, and 25 mA GPIO sink. Startup requires minimum 1.0 V; output regulation holds across temperature and load per DC Electrical Characteristics table.

Is there hardware support for CRC computation in CY8C29666-24LFXI?

Yes - one dedicated digital PSoC block implements configurable 8-, 16-, 24-, or 32-bit CRC generation with programmable polynomial, initial value, and final XOR. It operates autonomously during DMA transfers or UART/SPI reception, offloading the CPU and ensuring deterministic checksum calculation for firmware updates and communication integrity.