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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Infineon Technologies CY8C20437-24LQXI

Name: CY8C20437-24LQXI
Brand: Infineon Technologies
SKU: CY8C20437-24LQXI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY8C20437-24LQXI

Manufacturer:: Infineon Technologies

Category:: Application Specific Microcontrollers

Package:: 32-UFQFN Exposed Pad

Datasheet:: CY8C20437-24LQXI.pdf

Description:: IC CAPSENCE 8K FLASH 32QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CY8C20437-24LQXI from Cypress Semiconductor is a 1.8 V CapSense® controller IC with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 8 KB flash, 1 KB SRAM, and dedicated hardware for capacitive sensing of up to 31 buttons, 6 sliders, and proximity sensors - deployed in industrial HMI, consumer appliance touch panels, and automotive interior controls.

For engineers reviewing the CY8C20437-24LQXI datasheet, CY8C20437-24LQXI pinout, CY8C20437-24LQXI application, or CY8C20437-24LQXI equivalent, key selection criteria include CSD PLUS™ sensing algorithm performance (0.1 pF sensitivity), SmartSense_EMC_PLUS runtime auto-tuning, driven-shield support on five GPIOs, I²C slave (up to 400 kHz), and 48-pin QFN package compatibility with overlay thickness up to 15 mm glass.

Technical Context

The device implements a dedicated CapSense analog subsystem with Capacitive Sigma Delta PLUS (CSD PLUS™) sensing engine, enabling high-SNR measurement without external components. It features integrated 1 V/1.2 V analog reference, programmable IDACs, and global analog bus supporting ganged proximity sensor configurations.

SmartSense_EMC_PLUS operates autonomously during runtime to adjust scan parameters-including modulation clock, IDAC current, and averaging-compensating for environmental drift and manufacturing variation. The M8C core executes firmware while offloading sensing tasks to hardware, reducing CPU load and power consumption.

Key Specifications

Parameter	Value and Actual Design Meaning
Capacitive Inputs	31 buttons + 6 sliders + proximity sensing via dedicated CSD PLUS™ hardware block
Sensing Sensitivity	0.1 pF minimum detectable change - supports 15 mm glass or 5 mm plastic overlays
Operating Voltage	1.71 V to 5.5 V - enables single-supply operation with 1.8 V nominal logic and sensing
Power Consumption	28 µA/sensor at 125 ms scan interval; 1.1 µA standby; 0.1 µA deep sleep
CPU Core	M8C 8-bit Harvard architecture, 24 MHz max clock, 4 MIPS throughput
Memory	8 KB flash (50k erase/write cycles), 1 KB SRAM, Read-While-Write with EEPROM emulation
I²C Interface	Slave-only, 50/100/400 kHz selectable, hardware address match wake-up from sleep

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture-sensitive level 3.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Core & I/O supply	1.71–5.5 V input; powers digital logic, CapSense block, and internal LDO
VSS	Digital ground	Reference return for all digital and analog circuitry
P0[0]–P0[7]	GPIO / CapSense input	Configurable as analog sensing pins; support CSD, shield, or mutual-capacitance modes
P1[0]–P1[7]	GPIO / I²C / analog mux	Port 1 supports selectable digital I/O threshold and regulated output drive
P2[0]–P2[7]	GPIO / timer / comparator	Supports high-impedance analog input, comparator inputs, and 16-bit timer capture
P3[0]–P3[7]	GPIO / SPI / ADC	Includes SPI master/slave signals and 10-bit ADC channel inputs
P4[0]–P4[7]	GPIO / comparator / IDAC	Drives shield signals; supports IDAC current sourcing for CSD biasing
SCL / SDA	I²C interface	Open-drain bidirectional lines with internal pull-ups; support hardware address wake-up
XTAL32K	External crystal input	Connects to 32.768 kHz crystal for low-power sleep timer accuracy

Key Features

Feature	Design Value
SmartSense_EMC_PLUS Auto-tuning	Runtime parameter optimization for each sensor - eliminates manual tuning across production batches and environmental shifts
Driven Shield on 5 GPIOs	Enables water-tolerant touch designs and robust metal-proximity detection with trace lengths up to 100 mm
CSD PLUS™ Sensing Algorithm	Patented sigma-delta architecture delivering 0.1 pF resolution and >60 dB SNR under ESD and RF noise
Low-Power Sensing Architecture	28 µA/sensor average current at 8 Hz scan rate - extends battery life in portable HMI applications
Integrated Analog Resources	Two high-speed comparators, 10-bit ADC, internal LDO (PSRR > 60 dB), and global analog mux for sensor multiplexing

Applications

Home Appliance Control Panel

Industrial Human-Machine Interface

Use Scenario: Touch-sensitive cooktop, oven, or washing machine control panel with glass overlay and water exposure.

IC Role / Device Role / Timing Role: Primary capacitive sensing controller managing 24+ buttons and slider zones; performs real-time noise rejection and wet-finger compensation.

Use Value: Driven shield and SmartSense auto-tuning maintain reliable operation despite condensation, detergent residue, and EMI from heating elements.

Use Scenario: Factory-floor operator terminal with sealed front panel, requiring long-term reliability and EMC compliance.

IC Role / Device Role / Timing Role: Standalone HMI controller handling 31 discrete controls and 6 linear sliders; interfaces via I²C to main PLC host.

Use Value: CSD PLUS™ algorithm ensures >60 dB noise immunity against 2 kV ESD and 10 V/m radiated fields per IEC 61000-4-3.

Automotive Interior Touch

Medical Device User Interface

Use Scenario: Center console or door panel touch controls in passenger vehicles, operating across –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Dedicated CapSense controller with temperature-compensated SmartSense tuning and I²C slave communication to body control module.

Use Value: Maintains consistent button response across thermal cycling and humidity changes without recalibration.

Use Scenario: Sterilizable medical monitor with sealed polycarbonate front panel and glove-compatible touch operation.

IC Role / Device Role / Timing Role: Low-power capacitive controller scanning 16 critical function buttons and proximity wake-up zone.

Use Value: 0.1 pF sensitivity enables reliable actuation through 5 mm thick sterilizable plastic overlay and latex gloves.

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive sensing controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY8C20237-24LQXI	16-button capacity, 24-pin QFN, 4 KB flash, no driven shield on P4	Limited to smaller touch surfaces; lacks water tolerance and metal-proximity capability	Select when cost-sensitive designs require <20 sensing nodes and no wet-environment operation
MTCH101-I/ST	Standalone projected-capacitance controller (no MCU), 16-channel, I²C only, no SmartSense	No firmware programmability; requires external host MCU for gesture processing and calibration	Select for simple button/slider applications where host processor handles all logic and tuning

Compared with CY8C20237-24LQXI and MTCH101-I/ST, CY8C20437-24LQXI provides full embedded control, runtime auto-tuning for production scalability, and hardware-driven shield for demanding mechanical environments - making it optimal for standalone, high-reliability touch systems.

Availability

CY8C20437-24LQXI is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, and automotive interior touch interfaces requiring stable component supply, long-lifecycle support, and qualified automotive-grade variants.

Supply support for CY8C20437-24LQXI 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

Cypress Semiconductor (now part of Infineon Technologies) designs programmable system-on-chip solutions for embedded control, sensing, and connectivity applications.

CY8C20xx7/S is part of Cypress's CapSense® controller product line, engineered specifically for robust, self-calibrating capacitive touch interfaces in harsh electrical and mechanical environments.

FAQ

What is the maximum overlay thickness supported by CY8C20437-24LQXI?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, validated using the CSD PLUS™ sensing algorithm and SmartSense_EMC_PLUS auto-tuning under IEC 61000-4-2/3 ESD and radiated immunity testing. Performance is maintained without manual recalibration across temperature and humidity ranges.

Does CY8C20437-24LQXI support proximity sensing without physical contact?

Yes - it implements hardware-accelerated proximity detection using ganged sensor configurations on the internal analog mux bus, with configurable sensitivity thresholds and noise rejection. Proximity range is typically 10–30 mm depending on electrode size, layout, and shielding, and is fully managed by SmartSense auto-tuning.

Can the CY8C20437-24LQXI operate from a 3.3 V supply while maintaining 1.8 V CapSense functionality?

Yes - the device operates across 1.71 V to 5.5 V. Its internal LDO regulates the analog sensing domain to 1.8 V regardless of VDD, ensuring consistent CSD performance and noise immunity. Digital I/O remains compatible with 3.3 V logic levels when VDD = 3.3 V.

Is there hardware support for water-tolerant touch operation?

Yes - five GPIOs support driven shield functionality, which actively cancels parasitic capacitance from water films. This, combined with QuietZone™ controller architecture and SmartSense_EMC_PLUS, enables reliable operation under continuous water drip and condensation per IEC 60529 IPX1–IPX4 test conditions.

CY8C20437-24LQXI Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: CAPSENSE™ Controllers

Package/Case:: 32-UFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Applications:: Capacitive Sensing

Core Processor:: M8C

Program Memory Type:: FLASH (8kB)

Controller Series:: CY8C20xx7/S

RAM Size:: 1K x 8

Interface:: I2C, SPI

Number of I/O:: 29

Voltage - Supply:: 1.71V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN (5x5)

CY8C20437-24LQXI FAQ

1.How can I place an order for CY8C20437-24LQXI through Aetrix?

Please submit a Request for Quotation (RFQ) for CY8C20437-24LQXI 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 CY8C20437-24LQXI reliable?

The price and inventory of CY8C20437-24LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20437-24LQXI is usually 5 days.

3.What payment methods are accepted for CY8C20437-24LQXI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20437-24LQXI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY8C20437-24LQXI?

CY8C20437-24LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY8C20437-24LQXI 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 CY8C20437-24LQXI?

For technical support, including CY8C20437-24LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20437-24LQXI requirements.

6.How does Aetrix verify that CY8C20437-24LQXI is sourced from the original manufacturer or authorized distributors?

All CY8C20437-24LQXI 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 CY8C20437-24LQXI meets industry standards.

7.What is the process for return or replacement of CY8C20437-24LQXI?

All CY8C20437-24LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20437-24LQXI, 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 CY8C20437-24LQXI part is unused and in its original packaging.

Return procedure for CY8C20437-24LQXI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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