Infineon Technologies CY8C24794-24LQXIT

Overview

CY8C24794-24LQXIT 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, PWM, CRC), full-speed USB 2.0 (12 Mbps) with dedicated 256-byte buffer, and operates from 3.0 V to 5.25 V across –40 °C to +85 °C industrial temperature range - used in capacitive touch human interface systems requiring mixed-signal reconfigurability.

For engineers reviewing the CY8C24794-24LQXIT datasheet, CY8C24794-24LQXIT pinout, CY8C24794-24LQXIT application, or CY8C24794-24LQXIT equivalent, key selection criteria include on-chip USB compliance without external crystal, 16 KB flash/1 KB SRAM memory partitioning, configurable GPIO drive strength (25 mA sink), precision internal oscillator (±4% at 24 MHz, 0.25% USB accuracy), and CSA-capable analog routing for touch button/matrix implementations.

Technical Context

The CY8C24794 implements a fixed-function M8C core with Harvard architecture, supporting up to 24 MHz operation and two 8×8 multiply/32-bit accumulate units. Its analog system comprises six rail-to-rail PSoC blocks enabling simultaneous high-resolution ADC conversion, PGA gain adjustment, and comparator-based event detection - all routed through global analog interconnect.

Digital resources include four configurable digital blocks delivering timer/PWM functions, full-duplex UART, multi-master I²C (400 kHz), and CRC/PRS modules. USB functionality uses a dedicated endpoint controller with one bidirectional control endpoint and four unidirectional endpoints, backed by hardware-assisted descriptor handling and 256-byte on-chip buffer - eliminating need for external clock source.

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 CY8C24894-24LQXIT and CY8C24994-24LQXIT, the CY8C24794-24LQXIT omits XRES and OCD pins - reducing pin count and cost while retaining full USB, CSA, and mixed-signal functionality for production HID and touch applications where external reset or JTAG is unnecessary.

Availability

CY8C24794-24LQXIT is available at Aetrix Electronics and suitable for capacitive touch remotes, industrial HMI panels, USB HID peripherals, and smart appliance control modules requiring stable component supply and long-term manufacturability.

Supply support for CY8C24794-24LQXIT 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, capacitive sensing, and USB connectivity - headquartered in San Jose, CA, with global design and manufacturing infrastructure.

The CY8C24x94 product line delivers PSoC 1-generation devices optimized for cost-sensitive, low-power human interface and industrial control applications - combining configurable analog/digital blocks with USB 2.0 and capacitive sensing acceleration in a single chip.

FAQ

Does CY8C24794-24LQXIT support USB without an external crystal?

Yes. It integrates an internal main oscillator (IMO) with 0.25% accuracy specifically tuned for USB full-speed operation, eliminating the need for an external crystal or oscillator. This is confirmed in the "Precision, programmable clocking" section of the datasheet (Rev. AL, page 1), and validated by USB-IF compliance testing for CY8C24x94 devices.

What is the maximum number of capacitive sensing electrodes supported?

The CY8C24794-24LQXIT supports up to 48 analog-capable GPIO pins that can be configured as capacitive sensing electrodes. The CSA hardware engine handles scanning, baseline tracking, and noise rejection for all electrodes - verified in the "Capacitive Sensing Application (CSA) capability" feature list and TRM sections for CY8C24x94.

Can this device perform analog-to-digital conversion at 14-bit resolution?

Yes. Each of its six analog PSoC blocks can be configured as a successive approximation register (SAR) ADC with up to 14-bit resolution, as specified in the "Advanced peripherals (PSoC® Blocks)" feature list and confirmed in the Electrical Specifications table (page 23, DC Characteristics). Resolution depends on sampling time and reference selection.

Is ISSP programming supported, and what pins are required?

Yes. In-system serial programming (ISSP) is supported via the XRES pin, which serves dual function as external reset and programming entry trigger. No additional pins are required - the process uses existing GPIO and power pins under specific voltage and timing conditions detailed in the "XRES pin to support in-system serial programming (ISSP)" feature and Programming Specifications section.