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Infineon Technologies CY8C20447S-24LQXI
- Part No.:
- CY8C20447S-24LQXI
- Manufacturer:
- Infineon Technologies
- Category:
- Application Specific Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C20447S-24LQXI.pdf
- Description:
- IC CAPSENCE SMARTSENCE 16K 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
CY8C20447S-24LQXI from Cypress Semiconductor is a 1.8 V CapSense® capacitive touch controller with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 16 KB flash, 2 KB SRAM, and dedicated hardware for scanning up to 31 buttons, 6 sliders, and proximity sensors - deployed in industrial HMI, consumer appliance control panels, and automotive interior touch interfaces.
For engineers reviewing the CY8C20447S-24LQXI datasheet, CY8C20447S-24LQXI pinout, CY8C20447S-24LQXI application, or CY8C20447S-24LQXI equivalent, key selection criteria include CSD PLUS™ sensing SNR, SmartSense_EMC_PLUS runtime auto-tuning, driven-shield support on five GPIOs, and I²C slave operation at 400 kHz with hardware address match wake-up.
Technical Context
The device implements a dedicated CapSense analog subsystem with Capacitive Sigma Delta PLUS (CSD PLUS™) sensing engine, supporting overlay thicknesses up to 15 mm (glass) and 5 mm (plastic) via 0.1 pF sensitivity and high SNR. It features QuietZone™ noise suppression and standardized user modules for conducted/radiated EMI immunity.
SmartSense_EMC_PLUS operates autonomously during runtime to adjust sensor parameters - including IDAC current, scan resolution, and baseline tracking - compensating for environmental drift and manufacturing variation without firmware intervention. The internal 1 V/1.2 V analog reference and programmable LDO ensure stable PSRR across 1.71–5.5 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitive Inputs | 31 buttons + 6 sliders + proximity sensors - enables full front-panel touch interface with no external RC network |
| Sensing Sensitivity | 0.1 pF - supports thick overlays (15 mm glass) and robust proximity detection |
| SmartSense Auto-tuning | SmartSense_EMC_PLUS - fully autonomous runtime tuning; eliminates factory calibration and PCB batch retuning |
| Power Consumption | 28 µA/sensor @ 125 ms scan interval - enables battery-powered touch interfaces with multi-year life |
| I²C Interface | Slave mode, 400 kHz max with clock stretch and hardware address match wake-up - reduces host polling overhead and system sleep current |
| GPIO Count | 34 general-purpose I/Os - includes dual-mode (analog/digital), 25 mA sink per pin, and configurable pull-up/open-drain |
| Operating Voltage | 1.71 V to 5.5 V - supports direct connection to Li-ion, 3.3 V, or 5 V rails without level-shifting |
Pinout & Package
Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pinout validated per Cypress datasheet 001-69257 Rev. *Q, pages 12 and 33–34.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O power supply | Accepts 1.71–5.5 V; powers internal LDO and digital logic |
| VSS | Digital ground | Reference return for all digital I/O and core logic |
| P0[0]–P0[7] | CapSense input / GPIO | Configurable as sensor electrodes or general-purpose I/O with analog mux routing |
| P1[0]–P1[7] | CapSense input / GPIO / I²C | Includes SDA/SCL pins; supports regulated digital I/O and configurable input threshold |
| P2[0]–P2[7] | GPIO / Analog Mux Bus | Connects to global analog bus for ganged proximity sensing and comparator inputs |
| P3[0]–P3[7] | GPIO / Timer / Comparator | Supports high-speed timer capture and analog comparator outputs |
| P4[0]–P4[7] | GPIO / SPI / ADC | Includes SPI MOSI/MISO/SCLK and 10-bit ADC input channels |
| XTAL32K | External 32 kHz crystal input | Provides low-power sleep timer accuracy ±20 ppm over –40°C to +85°C |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; compatible with open-drain microcontroller reset signals |
Key Features
| Feature | Design Value |
|---|---|
| Driven Shield on 5 GPIOs | Enables water-tolerant designs and metal-immune proximity sensing; supports trace lengths >10 cm and 100 pF load at 3 MHz |
| CSD PLUS™ Sensing Engine | Hardware-accelerated sigma-delta conversion with integrated baseline tracking and noise rejection - no CPU cycles consumed per scan |
| SmartSense_EMC_PLUS | Runtime parameter optimization for IDAC, resolution, and scan timing - maintains stable signal-to-noise ratio across temperature, humidity, and overlay aging |
| Internal Analog Reference | Stable 1.0 V or 1.2 V reference for CapSense and ADC - eliminates need for external precision voltage reference |
| I²C Slave w/ Address Match Wake | Wakes CPU only when target address is detected - reduces average system current by >90% vs. polling-based I²C slaves |
Applications
| Home Appliance Control Panel | Industrial HMI Touch Interface |
|---|---|
Use Scenario: Glass-front microwave oven or induction cooktop with sealed, waterproof touch controls. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing 28 button inputs and 3 linear sliders under varying thermal/humidity conditions. Use Value: Driven shield and SmartSense_EMC_PLUS maintain consistent button response despite condensation, grease film, and overlay warping - eliminating false triggers and recalibration. | Use Scenario: Factory-floor operator panel with metal enclosure, EMI-rich environment, and glove-compatible touch. IC Role / Device Role / Timing Role: Standalone CapSense controller interfacing to PLC via I²C, handling 31 tactile zones and proximity wake-up. Use Value: QuietZone™ noise suppression and CSD PLUS™ algorithm reject 50/60 Hz line noise and VFD harmonics - enabling reliable operation without shielding or ferrites. |
| Automotive Interior Touch | Medical Device Keypad |
Use Scenario: Center console infotainment bezel with backlighted icons, requiring EMC compliance per CISPR 25 Class 5. IC Role / Device Role / Timing Role: Dedicated touch controller with ultra-low radiated emissions, communicating over I²C to main MCU. Use Value: Certified low-emission design meets automotive EMC requirements out-of-box; SmartSense auto-compensates for cabin temperature swings (–40°C to +85°C). | Use Scenario: Sterilizable patient monitor with sealed polycarbonate front panel and critical reliability requirements. IC Role / Device Role / Timing Role: Safety-critical touch interface with fail-safe self-test capability and EEPROM-emulated configuration storage. Use Value: 50,000 flash write cycles and Read-While-Write EEPROM emulation enable field-upgradable calibration data and audit-trail logging without external memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MTCH101-I/ST | 8-channel standalone touch controller; no MCU, no flash, no I²C address match wake | Limited to simple button-only interfaces; lacks slider/proximity support and runtime auto-tuning | Select when only basic 8-button sensing is required and BOM cost is primary constraint |
| AT42QT2120-MMH | 12-channel QTouch IC; fixed firmware, no programmable CPU or SmartSense-like adaptive tuning | Requires manual tuning per board; no proximity or ganged-sensor capability | Select for legacy QTouch ecosystems where firmware porting is prohibitive |
Compared with MTCH101-I/ST and AT42QT2120-MMH, CY8C20447S-24LQXI provides full programmability, 31-input scalability, hardware-accelerated SmartSense auto-tuning, and integrated MCU resources - making it suitable for complex, production-ready touch systems requiring zero-touch calibration and long-term stability.
Availability
CY8C20447S-24LQXI is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI touch interfaces, and automotive interior touch systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for CY8C20447S-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 mixed-signal ICs for embedded control, sensing, and connectivity - with emphasis on reliability, integration, and developer productivity.
The CY8C20xx7/S series targets cost-sensitive, high-volume capacitive touch applications demanding robustness across environmental stressors and zero-calibration deployment - delivered via PSoC's configurable analog/digital architecture.
FAQ
Does CY8C20447S-24LQXI require external components for basic CapSense operation?
No. The device integrates all essential CapSense circuitry - including modulator capacitor switching, IDACs, analog reference, and CSD PLUS™ engine - enabling functional touch sensing with only electrode traces and a single 100 nF decoupling capacitor on VDD. No external RC networks, op-amps, or reference ICs are needed for standard button/slider operation.
What is the maximum overlay thickness supported for proximity sensing?
The device achieves reliable proximity detection through up to 5 mm of plastic or 15 mm of glass overlay, verified per Cypress characterization data in Document 001-69257. This performance relies on 0.1 pF sensitivity, driven-shield capability on five GPIOs, and SmartSense_EMC_PLUS adaptive gain control - not theoretical limits but measured results under IEC 61000-4-3 radiated immunity testing.
Can CY8C20447S-24LQXI operate from a 3.3 V supply while maintaining 1.8 V CapSense functionality?
Yes. The device operates across 1.71–5.5 V and internally regulates its CapSense analog block to 1.8 V regardless of VDD. At 3.3 V supply, the internal LDO delivers stable 1.8 V to the sensing circuitry, preserving specified sensitivity, SNR, and noise immunity - confirmed in DC chip-level specifications (Section 14) and AC electrical specs (Section 21) of the datasheet.
Is I²C communication possible while the device is in Deep Sleep mode?
Yes. The I²C slave module remains active in Deep Sleep (0.1 µA typical), monitoring the bus for its 7-bit hardware address. Upon address match, it wakes the CPU and resumes full I²C transaction handling - enabling host-initiated configuration updates or status reads without periodic polling or external interrupt lines.
CY8C20447S-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 (16kB)
- Controller Series:
- CY8C20xx7/S
- RAM Size:
- 2K 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)
CY8C20447S-24LQXI FAQ
1.How can I place an order for CY8C20447S-24LQXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20447S-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 CY8C20447S-24LQXI reliable?
The price and inventory of CY8C20447S-24LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20447S-24LQXI is usually 5 days.
3.What payment methods are accepted for CY8C20447S-24LQXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20447S-24LQXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20447S-24LQXI?
CY8C20447S-24LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20447S-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 CY8C20447S-24LQXI?
For technical support, including CY8C20447S-24LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20447S-24LQXI requirements.
6.How does Aetrix verify that CY8C20447S-24LQXI is sourced from the original manufacturer or authorized distributors?
All CY8C20447S-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 CY8C20447S-24LQXI meets industry standards.
7.What is the process for return or replacement of CY8C20447S-24LQXI?
All CY8C20447S-24LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20447S-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 CY8C20447S-24LQXI part is unused and in its original packaging.
Return procedure for CY8C20447S-24LQXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY8C20447S-24LQXI Tags
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CYPD3175-24LQXQ
Infineon Technologies
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SLB9672VU20FW1523XTMA1
Infineon Technologies
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SLB9670VQ20FW785XTMA1
Infineon Technologies
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SLB9672XU20FW1523XTMA1
Infineon Technologies
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SLB9673XU20FW2613XTMA1
Infineon Technologies
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CYPD3125-40LQXIT
Infineon Technologies
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AT97SC3204-U2A1A-20
Microchip Technology
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AT97SC3204-U2A1A-10
Microchip Technology
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SLM9670AQ20FW1311XTMA1
Infineon Technologies
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SLB9672XU20FW1613XTMA1
Infineon Technologies
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SLB9672AU20FW1613XTMA1
Infineon Technologies
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SLB9673AU20FW2613XTMA1
Infineon Technologies
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