Infineon Technologies CY8C24794-24LQXI

Overview

CY8C24794-24LQXI from Cypress Semiconductor is a programmable System-on-Chip (PSoC) integrating an M8C 8-bit Harvard-architecture CPU, six analog PSoC blocks (supporting up to 14-bit ADCs and 9-bit DACs), four digital PSoC blocks (including UART, SPI, and PWM), 16 KB flash, 1 KB SRAM, and full-speed USB 2.0 (12 Mbps) with dedicated 256-byte buffer - used in capacitive touch HMI systems requiring mixed-signal reconfigurability and on-chip USB connectivity.

For engineers reviewing the CY8C24794-24LQXI datasheet, CY8C24794-24LQXI pinout, CY8C24794-24LQXI application, or CY8C24794-24LQXI equivalent, key selection criteria include its 24 MHz M8C core speed, ±4% internal main oscillator accuracy, 3–5.25 V operating voltage, industrial temperature range (–40 °C to +85 °C), and configurable GPIO drive strength (25 mA sink / 10 mA source).

Technical Context

The CY8C24794-24LQXI implements a fixed-function M8C core with two 8×8 multipliers and 32-bit accumulator, paired with programmable analog/digital blocks routed via global interconnect. Its USB subsystem operates at 12 Mbps with four unidirectional endpoints and one bidirectional control endpoint, fully compliant with USB 2.0 without external crystal dependency.

Analog resources include rail-to-rail PSoC blocks supporting PGA, comparator, filter, and decimator-based ADCs up to 14-bit resolution; digital blocks provide 8–32-bit timers, CRC/PRS modules, and I²C (up to 400 kHz), all configurable through PSoC Designer IDE and mapped to up to 48 GPIO pins with interrupt capability.

Key Specifications

Pinout & Package

LQFP-68 package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C24894-24LQXI and CY8C24994-24LQXI, the CY8C24794-24LQXI omits XRES and OCD features - reducing cost and pin count while retaining full USB, analog, and digital functionality for production-ready touch/HID designs where those debug/reset signals are handled externally.

Availability

CY8C24794-24LQXI is available at Aetrix Electronics and suitable for industrial HMI, USB sensor nodes, embedded HID devices, and capacitive touch remotes requiring stable component supply and long-term lifecycle support.

Supply support for CY8C24794-24LQXI 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, sensing, and connectivity applications, with global R&D and manufacturing infrastructure.

The CY8C24x94 product line delivers cost-optimized PSoC devices targeting capacitive touch, USB-HID, and sensor interface applications where analog/digital configurability and single-chip integration reduce system complexity.

FAQ

Does CY8C24794-24LQXI support crystal-less USB operation?

Yes. The device integrates a precision internal oscillator (IMO) with 0.25% accuracy specifically for USB timing, enabling full-speed (12 Mbps) USB 2.0 compliance without any external crystal or resonator. This is confirmed in the "Precision, programmable clocking" section of the datasheet (Rev. AL, page 1).

What is the maximum analog input resolution supported by its ADC?

The CY8C24794-24LQXI supports up to 14-bit analog-to-digital conversion using its decimator-based ADC architecture within the analog PSoC blocks. This resolution is achieved via oversampling and digital filtering, as documented in the "Advanced peripherals" feature list (page 1) and TRM register descriptions.

Can it perform capacitive sensing without external components?

Yes. The device includes dedicated hardware for capacitive sensing (CSA) across multiple GPIOs, supporting self- and mutual-capacitance measurement with built-in IDACs, integrators, and scanning logic - requiring only PCB traces and no external RC networks or dedicated touch controllers.

Is there hardware support for I²C communication?

Yes. The CY8C24794-24LQXI provides dedicated I²C hardware supporting slave, master, and multi-master modes up to 400 kHz. It includes automatic address matching, ACK/NACK handling, and clock stretching - implemented in the digital system resources, not emulated in firmware.