Infineon Technologies CY8C27643-24LFXIT

Overview

CY8C27643-24LFXIT from Cypress Semiconductor is a programmable mixed-signal array (PSoC™) integrating an M8C 8-bit Harvard architecture CPU, 16 KB Flash, 256 bytes 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 performance with configurable GPIO, ADCs up to 14-bit, DACs up to 9-bit, and dual UARTs - deployed in industrial motor control interfaces requiring integrated signal conditioning and real-time firmware execution.

For engineers reviewing the CY8C27643-24LFXIT datasheet, CY8C27643-24LFXIT pinout, CY8C27643-24LFXIT application, or CY8C27643-24LFXIT equivalent, key selection criteria include verified analog block count (12), digital block count (8), I/O count (up to 44), Flash endurance (50,000 erase/write cycles), and support for dynamic reconfiguration of user modules at runtime.

Technical Context

The CY8C27643-24LFXIT implements a fully configurable mixed-signal architecture where analog and digital resources are decoupled yet interconnected via global analog and digital buses. Its M8C core executes at 24 MHz with 8×8 multiply/32-bit accumulate capability, while system clocks derive from a ±2.5% internal 24 MHz oscillator (IMO), optionally doubled to 48 MHz via PLL or synchronized to a 32.768 kHz crystal for RTC accuracy.

Analog functionality is realized through 12 independently configurable blocks - each supporting opamp-based topologies including programmable-gain amplifiers (up to 48×), 2–8 pole filters, comparators with 16 thresholds, and Delta-Sigma/SAR/Incremental ADCs (6–14 bit). Digital peripherals are built from 8 scalable 8-bit blocks combinable into 8/16/24/32-bit timers, PWMs, CRC generators, SPI masters/slaves, and up to two full-duplex UARTs - all routable to any GPIO via programmable interconnect.

Key Specifications

Pinout & Package

This device is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8 mm pitch and exposed thermal pad. Pin functions are validated per Cypress Document No. 38-12012 Rev. *I (CY8C27x43 Final Data Sheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C27443-24LFXIT, this part adds 8 KB Flash and EEPROM emulation for secure field updates; versus CY8C29866-24LFXIT, it trades package size and cost for sufficient resources in mid-complexity industrial controls - making it optimal for space-constrained designs needing runtime reconfiguration.

Availability

CY8C27643-24LFXIT is available at Aetrix Electronics and suitable for industrial motor interfaces, portable medical sensor hubs, smart home energy monitors, and automotive LIN bus nodes requiring stable component supply across extended production lifecycles.

Supply support for CY8C27643-24LFXIT 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, USB controllers, and memory products - founded in 1982 and headquartered in San Jose, California.

The PSoC™ family was designed to replace discrete analog/digital components with a single configurable chip for cost-sensitive, medium-complexity embedded systems - targeting industrial, medical, and automotive subsystems where flexibility and integration reduce time-to-market.

FAQ

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

The official PSoC™ Designer IDE (v5.x) is mandatory for configuring analog/digital user modules, generating initialization code, and performing in-circuit programming via ISSP™. It includes graphical device editors, C compiler support, and hardware emulator pods. Third-party toolchains are not supported due to proprietary configuration register mapping and dynamic reconfiguration metadata.

Does the CY8C27643-24LFXIT support true hardware AES or cryptographic acceleration?

No. This device lacks dedicated cryptographic hardware. Security relies on software-implemented algorithms (e.g., CRC-32 for integrity checks) and Flash block protection levels for IP confidentiality. For hardware crypto, consider Infineon's later PSoC 4 or PSoC 6 families with dedicated TRNG and SHA accelerators.

Can the on-chip switch-mode pump (SMP) power external circuitry?

No. The SMP output is internally routed only to the VDDA and VDDD rails. It cannot source current to external loads. External circuits requiring boosted voltage must use discrete DC-DC converters or charge-pump ICs - the SMP solely enables ultra-low-voltage operation of the CY8C27643 itself.

Is the 14-bit ADC resolution achievable simultaneously across all 12 analog inputs?

No. The 14-bit resolution is available only on a single ADC channel configured in Delta-Sigma mode with oversampling. Simultaneous sampling across multiple channels is limited to 12-bit SAR mode at up to 1 MSPS aggregate throughput - actual resolution depends on selected conversion method, clock source, and analog block allocation.