Infineon Technologies CY8C27643-24LFXI

Overview

CY8C27643-24LFXI from Cypress Semiconductor is a programmable mixed-signal array (PSoC™) integrating an M8C 8-bit Harvard CPU, 16 KB Flash, 256 B SRAM, 8 digital PSoC blocks, and 12 analog PSoC blocks in a 44-pin TQFP package. It operates at up to 24 MHz, supports 3.0–5.25 V supply (or 1.0 V with on-chip switch-mode pump), and delivers rail-to-rail analog functions including 14-bit ADCs, 9-bit DACs, and programmable gain amplifiers for embedded sensor interface and motor control applications.

For engineers reviewing the CY8C27643-24LFXI datasheet, CY8C27643-24LFXI pinout, CY8C27643-24LFXI application, or CY8C27643-24LFXI equivalent, key selection criteria include configurable analog/digital peripheral count, 24 MHz M8C core timing, 44-pin TQFP footprint compatibility, industrial temperature range (−40°C to +85°C), and ISSP™ in-system serial programming support.

Technical Context

The CY8C27643-24LFXI implements a fully configurable mixed-signal architecture with global digital and analog interconnects enabling custom peripheral synthesis-e.g., combining digital blocks to form 32-bit PWMs with dead-band or analog blocks to construct Delta-Sigma ADCs with decimation filtering. Its M8C core executes at 24 MHz with 4 MIPS throughput and integrates interrupt controller (17 vectors), Sleep/WDT timers, and flexible clocking (24/48 MHz IMO ±2.5%, optional 32.768 kHz ECO with PLL).

Analog resources include 12 blocks arranged in 4 columns (each with 1 CT + 2 SC blocks), supporting up to 4 independent ADCs (6–14-bit resolution, selectable architecture), 4 DACs (6–9-bit), instrumentation amplifiers (gain up to 93×), and 4 comparators with 16 threshold levels. Digital resources comprise 8 blocks organized in 2 rows, configurable as UARTs, SPI masters/slaves, CRC generators, or PRS modules-all routable to any of 44 GPIO pins.

Key Specifications

Pinout & Package

Package: 44-pin TQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C27443-24LFXI and CY8C27543-24LFXI, the CY8C27643-24LFXI provides optimal balance of analog capability, digital flexibility, and memory for cost-sensitive embedded control-retaining full 12-analog-block functionality while minimizing Flash overhead for deterministic real-time tasks.

Availability

CY8C27643-24LFXI is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, smart home thermostats, and medical front-end modules requiring stable component supply across long-lifecycle production programs.

Supply support for CY8C27643-24LFXI 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 (acquired by Infineon in 2020) is a fabless semiconductor company specializing in programmable embedded solutions, USB controllers, memory, and PSoC™ mixed-signal arrays.

The CY8C27x43 product line was engineered to replace discrete analog/digital components with a single configurable chip for cost-sensitive, low-to-mid complexity embedded control-targeting industrial automation, consumer IoT, and portable medical devices.

FAQ

What development tools are required to program the CY8C27643-24LFXI?

PSoC™ Designer IDE (v5.4 or later) is mandatory for configuration and code generation. Programming requires the MiniProg1 or MiniProg3 programmer/debugger via SWD interface. The IDE provides graphical user module selection, automatic register setup, and C-language framework generation-no manual assembly or low-level register coding is needed for standard peripheral use.

Does the CY8C27643-24LFXI support true hardware I²C multi-master operation?

Yes-it implements full I²C specification compliance including arbitration, clock stretching, and 7-bit/10-bit addressing. The hardware module handles bus contention detection and automatic recovery without CPU intervention, enabling robust communication in distributed sensor networks where multiple masters share the same bus.

Can the on-chip switch-mode pump (SMP) power both analog and digital sections simultaneously?

Yes-the SMP generates a regulated output that can be routed to both VDDA (analog supply) and VDDD (digital supply) domains. When enabled, it supports concurrent operation of 14-bit ADCs, 9-bit DACs, and 24 MHz CPU execution from a single 1.2 V source, with typical efficiency of 82% at 10 mA load and <10 µV RMS ripple.

How many independent analog input channels can be sampled simultaneously?

Only one analog input channel is converted at a time due to shared SAR ADC hardware, but up to 12 channels can be sequentially scanned in under 100 µs using automatic channel sequencing and DMA-like result buffering. Simultaneous sampling is not supported-true parallel conversion requires external ADCs or higher-tier PSoC families.