Infineon Technologies CY8C21123-24SXI

Overview

CY8C21123-24SXI from Cypress Semiconductor is an 8-bit programmable system-on-chip (PSoC) featuring the M8C Harvard-architecture CPU running at up to 24 MHz, 4 KB flash, 256 bytes SRAM, and integrated analog/digital PSoC blocks for configurable peripherals. It operates from 2.4 V to 5.25 V (or down to 1.0 V with on-chip switch-mode pump), supports industrial temperature range (–40 °C to +85 °C), and targets embedded control in space-constrained sensor interface and low-power HMI applications.

For engineers reviewing the CY8C21123-24SXI datasheet, CY8C21123-24SXI pinout, CY8C21123-24SXI application, or CY8C21123-24SXI equivalent, key selection criteria include its 8-pin SOIC package, dual 10-bit ADC capability, four digital PSoC blocks supporting PWM/timers/UART/SPI/I²C, and GPIO-configurable analog input routing across all pins.

Technical Context

The CY8C21123-24SXI implements a fixed-function M8C core with Harvard architecture, paired with four digital PSoC blocks (each 8-bit, combinable into 8–32-bit peripherals) and four analog Type "E" blocks supporting comparators and single/dual 10-bit ADCs. Clocking includes ±5% internal 24/48-MHz IMO and low-power ILO for sleep/wake control.

Its system resources include an integrated 1.3 V voltage reference, switch-mode pump (SMP) for 1.0 V operation, I²C master/slave/multi-master up to 400 kHz, watchdog/sleep timers, and user-configurable low-voltage detection (LVD). All 8 GPIOs support analog input, pull-up/down, open-drain, and interrupt configuration.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), 150 mil width, RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L052C6T6 and MSP430FR2355, CY8C21123-24SXI uniquely integrates programmable analog/digital hardware blocks, on-chip SMP for 1.0 V operation, and full GPIO analog routing - making it optimal for compact, sensor-rich systems requiring hardware-level signal path adaptation without external components.

Availability

CY8C21123-24SXI is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat interfaces, medical wearable monitors, and automotive cabin control panels requiring stable component supply and long-term manufacturability.

Supply support for CY8C21123-24SXI 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, emphasizing integration, low power, and developer productivity through configurable hardware blocks.

The CY8C21x23 PSoC family targets cost-sensitive, space-constrained applications needing analog signal conditioning, digital control, and flexible I/O - delivering system-level functionality in minimal footprint without sacrificing design adaptability.

FAQ

What development tools are required to program the CY8C21123-24SXI?

PSoC Designer™ IDE (discontinued but still supported) is the native tool for configuring analog/digital blocks, generating firmware, and debugging via ICE. It provides drag-and-drop component placement, automatic register code generation, and full-speed emulation with 128 KB trace memory. No third-party toolchain is needed for basic development.

Does the CY8C21123-24SXI support true 10-bit ADC operation in 8-pin package?

Yes - the device supports both single and dual 10-bit 8-to-1 ADC configurations using its analog PSoC blocks. In the 8-pin SOIC, up to two analog inputs (P0[0] and P0[1]) can be sampled simultaneously at 10-bit resolution with programmable sample rate and reference selection (1.3 V or DAC).

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

No - the SMP output is internally connected only to the VDD rail and cannot be externally tapped. It is designed solely to boost VDD from 1.0–1.2 V input to operational voltage (e.g., 3.3 V), enabling single-cell battery use. External loads must be powered separately.

Is the CY8C21123-24SXI pin-compatible with other CY8C21x23 variants?

Yes - all CY8C21123/CY8C21223/CY8C21323 8-pin SOIC variants share identical pinout and electrical characteristics. Differences lie in flash size (CY8C21123 = 4 KB), SRAM (256 B), and enabled analog/digital block count - all configured in software, not hardware.