Infineon Technologies CY8C22345-24SXI

Overview

CY8C22345-24SXI from Cypress Semiconductor is a programmable PSoC® 1 System-on-Chip integrating an M8C 8-bit Harvard-architecture CPU (24 MHz), 16 KB flash, 1 KB SRAM, six analog PSoC blocks (including dual 8-bit ADC and up to four comparators), and eight digital PSoC blocks (supporting PWM, timers, UART, SPI, I²C, and CRC). It operates from 3.0 V to 5.25 V across –40 °C to +85 °C and is used in embedded control systems requiring mixed-signal reconfigurability, such as industrial HMI sensor interfaces.

For engineers reviewing the CY8C22345-24SXI datasheet, CY8C22345-24SXI pinout, CY8C22345-24SXI application, or CY8C22345-24SXI equivalent, key selection criteria include its 24 MHz M8C core speed, 10-bit SAR ADC (200 ksps, ±2.5 LSB INL), CapSense®-optimized dual IDACs (640 µA max), configurable GPIO drive modes (25 mA sink), and 28-pin SOIC package compatibility with legacy PSoC 1 designs.

Technical Context

The CY8C22345-24SXI implements a fixed-function yet highly configurable architecture where analog and digital resources are mapped via global interconnects-not software-defined peripherals. Its six analog blocks (Type "E") support simultaneous single/dual 8-bit ADC conversion and comparator-based threshold detection, synchronized to digital block events or external triggers.

Digital functionality is built from eight 8-bit PSoC blocks arranged in two rows; combinations enable 8–32-bit timers, dead-band PWMs, full-duplex UART, and hardware CRC-each routable to any of 38 GPIOs. Clocking relies on a factory-trimmed 24 MHz IMO (±5% over –40 °C to +85 °C), optionally stabilized to ±2.5% (0–70 °C) or enhanced via 32.768 kHz crystal + PLL for RTC-grade accuracy.

Key Specifications

Pinout & Package

Package: 28-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012AC, 300 mil width, 1.27 mm pitch - compatible with standard surface-mount assembly and legacy PSoC 1 PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C22345-24SXI, CY8C21345-24SXI trades flash/SRAM and analog resources for lower cost in constrained applications, while CY8C22545-24PXI extends I/O and routing capability at the expense of larger footprint and higher unit price - choice depends on pin budget, analog channel count, and firmware complexity.

Availability

CY8C22345-24SXI is available at Aetrix Electronics and suitable for industrial HMI panels, motor control interfaces, smart power outlets, and medical sensor nodes requiring stable component supply and long-term obsolescence management.

Supply support for CY8C22345-24SXI 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, combining configurable analog/digital blocks with microcontroller cores and development tools.

The PSoC 1 family, including CY8C22345-24SXI, was engineered for cost-sensitive, high-integration embedded applications requiring reconfigurable analog front-ends and deterministic real-time control - especially where CapSense®, motor control, or sensor fusion dominate system requirements.

FAQ

What is the maximum ADC sampling rate and linearity specification for CY8C22345-24SXI?

The 10-bit SAR ADC achieves 200 ksps maximum sampling rate with ±2.5 LSB integral nonlinearity (INL) and ±1.5 LSB differential nonlinearity (DNL) when VDD ≥ 3.0 V and Vref ≥ 3.0 V. External anti-aliasing filters are required on analog inputs to prevent frequency folding, and sample-and-hold operation is hardware-synchronized to digital block events or external triggers.

Does CY8C22345-24SXI support hardware UART with automatic baud rate detection?

No, CY8C22345-24SXI provides full-duplex UART with fixed baud rate generation via programmable clock dividers - it does not implement automatic baud rate detection. Baud rate is derived from the selected system clock (IMO, ECO+PLL, or external oscillator) and configured through PSoC Designer's UART User Module parameters, supporting standard rates up to 115.2 kbps at 24 MHz system clock.

Can the internal 24 MHz oscillator be used for USB or Ethernet timing?

No, the internal 24 MHz IMO has ±5% tolerance over –40 °C to +85 °C and is not suitable for USB or Ethernet physical layer timing, which require ±0.25% or tighter frequency stability. For such applications, an external crystal (e.g., 32.768 kHz ECO) combined with the internal PLL must be used to generate a stable 24 MHz clock with improved accuracy - verified in the device errata for 0–70 °C operation (±2.5%).

Is ISSP (In-System Serial Programming) supported on CY8C22345-24SXI, and what interface is required?

Yes, CY8C22345-24SXI supports ISSP using the SWD-compatible 5-pin interface (VDD, VSS, SCLK, SDATA, XRES). Programming requires Cypress's MiniProg1 or MiniProg3 programmer and PSoC Designer v5.4 or later. Partial flash updates are supported, allowing field firmware patches without erasing the entire program memory - critical for maintaining calibration data during upgrades.