Infineon Technologies CY8C21345-24SXIT

Overview

CY8C21345-24SXIT from Cypress Semiconductor is a programmable PSoC® 1 System-on-Chip integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 16 KB flash, 1 KB SRAM, six analog PSoC blocks (supporting dual 8-bit ADCs or comparators), and eight digital PSoC blocks (configurable as PWMs, timers, UART, SPI, I²C, CRC, or shift registers). It operates from 3.0 V to 5.25 V across –40 °C to +85 °C and targets embedded control with CapSense® touch interface.

For engineers reviewing the CY8C21345-24SXIT datasheet, CY8C21345-24SXIT pinout, CY8C21345-24SXIT application, or CY8C21345-24SXIT equivalent, key selection criteria include its 24 MHz IMO clock accuracy (±5% over industrial temp), 10-bit SAR ADC (200 ksps, ±2.5 LSB INL), dual CapSense clock resources (CSD_CLK/CNT_CLK), and 25 mA sink capability per GPIO - critical for robust capacitive sensing and mixed-signal control in space-constrained designs.

Technical Context

The CY8C21345-24SXIT implements a fixed-function yet highly configurable architecture where analog and digital PSoC blocks are interconnected via global analog/digital busing. Its M8C core executes instructions at up to 24 MHz using separate program/data buses, with hardware multiply-accumulate (8×8 → 32-bit) support for real-time filtering.

Digital peripherals are constructed by combining up to eight 8-bit digital blocks - enabling flexible 8-/16-/24-/32-bit timer/PWM configurations with deadband, full-duplex UART, and multi-master I²C (400 kHz). Analog functions rely on six Type "E" blocks supporting single/dual 8-bit ADCs, comparators with 1.3 V reference, and dedicated CapSense scanning logic synchronized to digital events.

Key Specifications

Pinout & Package

This device is packaged in a 28-pin SOIC (Small Outline Integrated Circuit) with 300 mil body width, lead finish matte tin, and RoHS-compliant construction. Pin assignments follow the CY8C21345/CY8C22345 28-pin SOIC layout per datasheet Rev. *W, page 8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C22345-24SXIT and CY8C21545-24LFXIT, the CY8C21345-24SXIT provides the minimal viable PSoC 1 configuration for cost-sensitive, space-constrained embedded control - retaining full CapSense, 10-bit ADC, and 24 MHz performance while reducing pin count and analog block allocation to match baseline system requirements.

Availability

CY8C21345-24SXIT is available at Aetrix Electronics and suitable for industrial HMI panels, smart appliance controllers, medical patient monitors, and automotive body controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for CY8C21345-24SXIT 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 architectures that unify analog, digital, and memory resources on a single chip.

The CY8C21x45 product line delivers entry-level PSoC 1 devices optimized for cost-sensitive capacitive touch and sensor-based control applications - emphasizing CapSense integration, low-power operation, and rapid prototyping with PSoC Designer software.

FAQ

What is the maximum achievable ADC sampling rate on CY8C21345-24SXIT?

The 10-bit SAR ADC achieves up to 200 ksps under specified conditions: VDD ≥3.0 V, Vref ≥3.0 V, and proper external anti-aliasing filtering. This rate is sustained with ±2.5 LSB INL and ±1.5 LSB DNL, making it suitable for real-time sensor acquisition in motor control and environmental monitoring applications.

Does CY8C21345-24SXIT support hardware-accelerated cryptographic operations?

No. The CY8C21345-24SXIT does not include dedicated cryptographic accelerators or secure key storage. Its MAC unit supports only 8×8 multiply with 32-bit accumulate for DSP tasks like FIR filtering. For secure boot or AES encryption, external co-processors or higher-tier PSoC generations (e.g., PSoC 4/6) are required.

Can the internal 24 MHz oscillator meet timing-critical PWM applications?

Yes. The internal main oscillator (IMO) delivers 24 MHz with ±5% accuracy across –40 °C to +85 °C, sufficient for non-critical PWM timing such as LED dimming or fan speed control. For tighter jitter control or synchronous motor commutation, the optional 32.768 kHz crystal + PLL configuration yields 24 MHz with crystal-grade stability.

How many CapSense buttons can be implemented simultaneously on CY8C21345-24SXIT?

Up to 28 independent CapSense buttons can be scanned using all GPIO pins, leveraging two IDACs (each configurable up to 640 µA) and dedicated CSD_CLK/CNT_CLK resources. Simultaneous dual-channel scanning is supported, enabling fast response times (<10 ms total scan time for 16 buttons) without CPU overhead.