CY8C21323-24PVXI

Overview

The CY8C21323-24PVXI is an 8-bit PSoC Programmable System-on-Chip featuring the M8C processor running at 24 MHz. It includes 4 KB of Flash program storage and 256 bytes of SRAM data storage. The device provides up to 16 GPIO pins with configurable drive modes and analog inputs. It integrates four digital PSoC blocks for timers, counters, PWMs, and communication interfaces like UART, SPI, and I2C. Four Type 'E' analog PSoC blocks support comparators and 10-bit ADCs. Operating voltage ranges from 2.4 V to 5.25 V, or down to 1.0 V using the on-chip switch mode pump.

Feature Summary

• Configurable analog and digital system resources allow custom peripheral creation without fixed function constraints.
• Integrated switch mode pump enables operation from a single low-voltage battery cell.
• Full-duplex serial communication interfaces including UART, SPI, and I2C are connectable to any GPIO pin.
• In-system serial programming supports partial flash updates and flexible protection modes.

Applications

• Battery-powered devices requiring low-voltage operation via switch mode pump
• Applications needing configurable analog signal processing such as sensor conditioning
• Systems requiring multiple serial communication protocols on flexible I/O pins
• Cost-sensitive designs replacing multiple discrete MCU and peripheral components

Procurement Notes

Verify the specific ordering suffix PVXI corresponds to the required 20-pin SSOP package and industrial temperature range. Confirm that the component source matches the Infineon/Cypress Semiconductor lineage. Ensure compatibility with PSoC Designer development tools for configuration. Check for any silicon errata related to frequency tolerance at extreme temperatures if operating outside the 0°C to 70°C range.

Selection Notes

Select this model when the application requires a balance of analog precision and digital flexibility in a compact footprint. The CY8C21x23 family offers limited analog blocks compared to larger PSoC families but provides sufficient resources for moderate complexity tasks. Consider the 24 MHz clock speed and 4 KB Flash size against project memory requirements. Evaluate the need for the switch mode pump if input voltage varies significantly.

Part Context

This component belongs to the PSoC 1 CY8C21xxx family, designed to integrate mixed-signal capabilities into a single chip. It utilizes the M8C Harvard architecture processor. The device is part of a broader ecosystem supported by PSoC Designer software and various development kits. It serves as a drop-in replacement for traditional microcontrollers in applications requiring programmable analog functions.

Replacement Considerations

Direct substitutes within the same datasheet include CY8C21123 and CY8C21223, differing primarily in package type and pin count. Verify pin compatibility and resource availability before substitution. Other PSoC 1 variants may offer more memory or I/O but require schematic redesign.

FAQ

What is the function of the SMP pin?

The SMP pin connects to external components for the on-chip switch mode pump, which boosts low input voltages (down to 1.0 V) to the required operating level for the core logic.

Can all GPIO pins be used for analog inputs?

Yes, up to eight analog inputs can be configured on the available GPIO pins through the analog column mux, depending on the specific package pinout.

How does the device handle low-voltage detection?

The device includes user-configurable low-voltage detection (LVD) that can generate interrupts when supply voltage falls below a set threshold, working alongside the integrated power-on reset circuit.