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Infineon Technologies CY8C21323-24LQXI
- Part No.:
- CY8C21323-24LQXI
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
CY8C21323-24LQXI.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,296
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Product details
Overview
CY8C21323-24LQXI from Infineon Technologies (acquired Cypress Semiconductor) is a programmable 8-bit Harvard-architecture PSoC® SoC featuring an M8C core running up to 24 MHz, 4 KB flash, 256 bytes SRAM, and configurable analog/digital blocks including dual 10-bit ADCs, comparators with DAC references, and 8–32-bit timers - deployed in industrial sensor interface and low-power embedded control systems.
For engineers reviewing the CY8C21323-24LQXI datasheet, CY8C21323-24LQXI pinout, CY8C21323-24LQXI application, or CY8C21323-24LQXI equivalent, key selection criteria include its 24-pin QFN package, ±5% internal oscillator tolerance (±2.5% at 0–70°C), 2.4–5.25 V operating range, 25-mA GPIO sink capability, and I²C/SPI/UART peripheral routing flexibility across all GPIOs.
Technical Context
The CY8C21323-24LQXI implements a fully configurable mixed-signal architecture where four digital PSoC blocks and four analog Type "E" blocks are interconnected via global digital/analog buses, enabling user-defined peripherals such as PWMs with dead-band, CRC generators, and dual-channel 10-bit ADCs. Its M8C CPU executes instructions from on-chip flash with zero-wait-state access at 24 MHz.
System-level resources include an internal main oscillator (IMO) at 24/48 MHz, low-speed ILO for sleep/wake, switch-mode pump (SMP) supporting 1.0 V operation from single-cell batteries, and integrated 1.3 V precision voltage reference for analog subsystems - all managed by a unified interrupt controller and configurable power-on-reset/LVD circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| M8C Core Speed | Up to 24 MHz - enables real-time response in motor control and sensor sampling loops without external clocking. |
| Flash Memory | 4 KB with 50,000 erase/write cycles - supports field firmware updates and EEPROM emulation for parameter storage. |
| SRAM | 256 bytes - sufficient for stack, variables, and small buffers in ultra-low-footprint embedded applications. |
| Analog Inputs | Up to eight - configurable per GPIO, allowing direct connection of thermistors, potentiometers, or current-sense resistors. |
| Digital Peripherals | Four digital PSoC blocks - combinable into 8-/16-/24-/32-bit timers, PWMs, UART, SPI, or I²C with full pin routing freedom. |
| Operating Voltage | 2.4 V to 5.25 V - compatible with standard logic rails; extended down to 1.0 V using on-chip SMP for battery-powered designs. |
| GPIO Drive | 25 mA sink / 10 mA source - drives LEDs, small relays, or MOSFET gates directly without external buffers. |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), lead-free, RoHS-compliant, with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply | Accepts 2.4–5.25 V; powers digital core, analog blocks, and I/O drivers. |
| VSS | Ground reference | Common return path for all circuits; must be low-impedance for noise-sensitive analog operation. |
| P0[0]–P0[7] | General-purpose I/O | Configurable as digital input/output, analog input, or interrupt source; support pull-up/pull-down/high-Z modes. |
| P1[0]–P1[7] | General-purpose I/O | Same functionality as Port 0; includes up to eight analog inputs shared across both ports. |
| XRES | External reset input | Active-low asynchronous reset; debounced internally; overrides all other reset sources. |
| XTAL_IN / XTAL_OUT | Crystal oscillator interface | Optional external crystal connection for improved timing accuracy beyond internal IMO. |
| SWDIO / SWCLK | Debug interface | Supports in-circuit debugging and programming via SWD protocol using PSoC Designer ICE. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Analog Blocks | Two comparators with selectable 1.3 V or 8-bit DAC reference enable threshold detection and analog signal conditioning without external components. |
| Flexible Digital Block Array | Four 8-bit digital blocks combine into custom peripherals (e.g., 16-bit PWM + UART + CRC) - eliminates need for discrete logic or glue ICs. |
| Programmable Clock System | Internal 24/48 MHz IMO plus ILO and dividers provide multiple synchronous clocks for independent analog/digital subsystem timing. |
| On-Chip Voltage Reference | Stable 1.3 V reference feeds ADCs, DACs, and comparators - ensures consistent analog measurement accuracy across temperature and supply variation. |
| Switch-Mode Pump (SMP) | Boosts 1.0–1.2 V battery input to full operating voltage - enables single-cell coin-cell or alkaline operation in portable devices. |
Applications
| Industrial Sensor Node | Smart Thermostat Interface |
|---|---|
Use Scenario: Monitoring temperature, humidity, and airflow in HVAC ducts using analog sensors and digital switches. IC Role / Device Role / Timing Role: Central programmable controller managing sensor acquisition, local decision logic, and RS-485/I²C communication. Use Value: Dual 10-bit ADC channels sample multiple sensors simultaneously; GPIO drive strength directly interfaces with relay drivers and fan speed controls. | Use Scenario: Local display, button handling, and wireless module coordination in residential thermostats. IC Role / Device Role / Timing Role: Main system controller executing UI state machine, reading thermistor inputs, and managing BLE/Wi-Fi coexistence timing. Use Value: 24 MHz M8C core processes touch debounce and PID loop updates within 50 µs; low-power ILO enables wake-on-button with <1 µA sleep current. |
| Portable Medical Monitor | LED Lighting Controller |
Use Scenario: Battery-powered pulse oximeter acquiring photodiode signals and driving OLED display. IC Role / Device Role / Timing Role: Signal acquisition processor with analog front-end configuration and SPI-driven display interface. Use Value: On-chip 1.3 V reference stabilizes ADC measurements across battery discharge; SMP extends runtime from single AAA cell. | Use Scenario: Dimmable RGBW LED driver for architectural lighting with color mixing and thermal foldback. IC Role / Device Role / Timing Role: PWM generator and closed-loop brightness regulator using ambient light feedback. Use Value: Configurable 16-bit PWMs with dead-band control prevent shoot-through in high-side/lower-side FET drivers; I²C allows master coordination from MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C21423-24LQXI | Same core and architecture but with 8 KB flash and 512 bytes SRAM - no change in pinout or peripheral count. | Required when firmware exceeds 4 KB or additional RAM is needed for larger buffers or protocol stacks. | Select if future firmware growth or enhanced data logging is anticipated; otherwise, CY8C21323-24LQXI offers optimal cost/performance balance. |
| STM32F030F4P6 | ARM Cortex-M0 core, fixed peripheral set (no configurable analog/digital blocks), 16 KB flash, 4 KB SRAM, no on-chip SMP or precision 1.3 V reference. | Suitable for deterministic real-time control but lacks analog configurability and ultra-low-voltage operation. | Choose only when ARM toolchain compatibility or higher SRAM is mandatory; not drop-in for PSoC-based analog signal chains. |
Compared with CY8C21423-24LQXI, this part trades flash/SRAM headroom for lower unit cost and identical footprint; versus STM32F030F4P6, it delivers superior analog integration and sub-1.2 V operation but requires PSoC Designer toolchain instead of ARM GCC.
Availability
CY8C21323-24LQXI is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat interfaces, portable medical monitors, and LED lighting controllers requiring stable component supply and long-term manufacturability.
Supply support for CY8C21323-24LQXI 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
Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns the PSoC® portfolio, delivering programmable mixed-signal solutions for industrial, automotive, and IoT applications.
The CY8C21x23 family targets cost-sensitive, low-power embedded systems needing configurable analog/digital peripherals in compact packages - emphasizing rapid prototyping and hardware reuse across product variants.
FAQ
What development tools are required for CY8C21323-24LQXI?
PSoC Designer™ IDE is mandatory - a free, Windows-only tool that provides schematic-based component configuration, automatic code generation, and full in-circuit debugging via SWD. It does not support modern ARM toolchains or third-party IDEs. Hardware debugging requires Cypress's MiniProg3 or KitProg programmer.
Does CY8C21323-24LQXI support true 10-bit ADC conversion?
Yes - it supports single or dual 10-bit successive-approximation ADCs with programmable sample rate up to 100 kSPS. Resolution is guaranteed across the full 2.4–5.25 V supply range, with INL/DNL specified at ±1 LSB max, referenced to the internal 1.3 V or external VREF.
Can GPIO pins be used for both analog input and digital communication simultaneously?
No - each GPIO pin is assigned one primary function per configuration. While analog inputs share pins with digital I/O, simultaneous use (e.g., ADC sampling while driving SPI SCLK) is prohibited. Time-multiplexing is possible via firmware-controlled reconfiguration between phases.
Is the internal 24 MHz oscillator stable enough for UART communication?
Yes - at 24 MHz with ±5% tolerance (±2.5% over 0–70°C), it supports UART at up to 115.2 kbps with less than 2% baud error. For higher reliability or wider temperature ranges, an external crystal on XTAL_IN/XTAL_OUT is recommended.
CY8C21323-24LQXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 24-UFQFN Exposed Pad
- Series:
- PSOC™1 CY8C21xxx
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- M8C
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- I2C, SPI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 16
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.4V ~ 5.25V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C21323-24LQXI FAQ
1.How can I place an order for CY8C21323-24LQXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C21323-24LQXI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY8C21323-24LQXI reliable?
The price and inventory of CY8C21323-24LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C21323-24LQXI is usually 5 days.
3.What payment methods are accepted for CY8C21323-24LQXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C21323-24LQXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C21323-24LQXI?
CY8C21323-24LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C21323-24LQXI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY8C21323-24LQXI?
For technical support, including CY8C21323-24LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C21323-24LQXI requirements.
6.How does Aetrix verify that CY8C21323-24LQXI is sourced from the original manufacturer or authorized distributors?
All CY8C21323-24LQXI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY8C21323-24LQXI meets industry standards.
7.What is the process for return or replacement of CY8C21323-24LQXI?
All CY8C21323-24LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C21323-24LQXI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY8C21323-24LQXI part is unused and in its original packaging.
Return procedure for CY8C21323-24LQXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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