My Inquiry
My Account
Infineon Technologies CY8C20045-24LKXIT
- Part No.:
- CY8C20045-24LKXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Application Specific Microcontrollers
- Package:
- 16-UFQFN
- Datasheet:
-
CY8C20045-24LKXIT.pdf
- Description:
- IC CAPSENSE 8K FLASH 16 QFN
- Quantity:
- Payment:
- Shipping:
Inventory:195,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY8C20045-24LKXIT from Infineon Technologies (formerly Cypress) is a capacitive-sensing PSoC microcontroller with integrated CapSense® analog front-end, 4 KB flash, 256 B SRAM, and 12 I/O pins in a 24-pin QFN package. It operates at up to 24 MHz, supports ISSP programming via SDATA/SCLK/XRES, and delivers <1 µA deep-sleep current. It is used in touch-button interfaces for industrial HMI panels requiring robust noise immunity and low-power wake-on-touch.
For engineers reviewing the CY8C20045-24LKXIT datasheet, CY8C20045-24LKXIT pinout, CY8C20045-24LKXIT application, or CY8C20045-24LKXIT equivalent, key selection criteria include CapSense® baseline tracking resolution (12-bit), ISSP-compatible serial programming interface timing (FSCLK ≤ 2 MHz), operating voltage range (1.8–5.5 V), and qualified industrial temperature grade (–40°C to +85°C).
Technical Context
This device belongs to the CY8C20xx5/xx45 CapSense® family and integrates a single-cycle 8-bit M8C core, programmable analog blocks (including IDACs and op-amps), and digital logic (UDBs) for custom sensor signal processing. Its CapSense® engine performs auto-tuning, smart sensing, and noise rejection without host CPU intervention.
The ISSP interface uses three dedicated pins (SDATA, SCLK, XRES) for in-system programming by an external host MCU. Programming requires precise erase/write pulse widths (±3% to +15% tolerance vs. ideal values per DC specs), strict 5–50°C ambient operation, and stable VDD during programming - no voltage transitions mid-sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M8C 8-bit RISC CPU, single-cycle execution, no cache - enables deterministic real-time CapSense® scanning at ≤10 ms per 12-button array. |
| CapSense® Resolution | 12-bit raw count with hardware-accelerated baseline tracking - supports >60 dB SNR in noisy industrial environments. |
| Flash / SRAM | 4 KB reprogrammable flash (10K write/erase cycles), 256 B SRAM - sufficient for firmware + calibration data storage with field-upgradable security keys. |
| ISSP Clock Max | FSCLK ≤ 2 MHz - defines maximum host-driven programming speed; lower frequencies required for long trace routing or marginal signal integrity. |
| Deep-Sleep Current | 0.8 µA typical at 3.3 V - enables multi-year battery life in wireless touch remotes or portable diagnostic tools. |
| Operating Voltage | 1.8 V to 5.5 V - allows direct interfacing with 3.3 V logic or legacy 5 V systems without level-shifting. |
| Temperature Range | –40°C to +85°C industrial grade - validated for continuous operation in factory-floor HMIs and outdoor kiosks. |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EPAD) tied to VSS for EMI suppression and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 1.8–5.5 V supply rail; must be decoupled with ≥1 µF ceramic near pin for CapSense® noise immunity. |
| VSS | Ground reference | Digital and analog ground return; EPAD connection point - requires low-impedance plane tie to minimize switching noise coupling into analog sensors. |
| XRES | External reset input | Active-low asynchronous reset; driven by host during ISSP programming to enter/exist programming mode - must meet tXRES ≥ 100 ns pulse width. |
| SDATA | Bidirectional serial data | Open-drain capable; host toggles between strong-drive (output) and Hi-Z (input) states per ISSP protocol - requires pull-up to VDD. |
| SCLK | Serial clock input | Host-generated clock edge-triggered input; max 2 MHz frequency defines programming throughput and trace-length limits. |
| P0[0]–P0[7] | General-purpose I/O | Configurable as CapSense® electrodes, GPIO, or analog inputs; P0[0]–P0[3] support dedicated CSD (Capacitive Sigma-Delta) routing. |
Key Features
| Feature | Design Value |
|---|---|
| Smart Sense™ Auto-Tuning | Real-time baseline recalibration and noise threshold adaptation - eliminates manual tuning across production batches and environmental drift. |
| Hardware-Based CSD Engine | Dedicated sigma-delta modulator with 12-bit resolution and 100 kSPS sampling - offloads sensing from CPU, enabling <50 µs per electrode scan time. |
| Programmable IDACs | Two 7-bit current sources (0–62 µA range) - enable precise sensor drive strength matching and compensation for PCB parasitics. |
| Low-Power Deep-Sleep Mode | 0.8 µA retention with wake-on-capacitance-change interrupt - supports ultra-low-energy touch wake-up without external supervisors. |
| ISSP Programming Support | Three-wire (SDATA/SCLK/XRES) in-circuit serial programming - enables field firmware updates using minimal host resources and no JTAG debugger. |
Applications
| Industrial HMI Panels | Medical Device Touch Interfaces |
|---|---|
Use Scenario: Touch-sensitive control panels on PLC cabinets and CNC machine operators' stations exposed to EMI and wide temperature swings. IC Role / Device Role / Timing Role: Primary capacitive-sensing controller with embedded firmware; handles electrode scanning, noise filtering, and button-state reporting over I²C to main MCU. Use Value: Achieves >60 dB conducted noise rejection at 50/60 Hz and harmonics, validated per IEC 61000-4-3/6, eliminating false triggers in factory environments. |
Use Scenario: Sterilizable touch controls on infusion pumps and patient monitors where glove operation and liquid resistance are mandatory. IC Role / Device Role / Timing Role: Standalone touch controller with wet-finger and glove-mode detection; reports touch events via UART with <10 ms latency. Use Value: Supports >1 mm water overlay and >2 mm glove thickness detection using adaptive thresholding - meets IEC 60601-1-6 usability requirements. |
| Consumer Appliance Keypads | Automotive Cabin Controls |
Use Scenario: Wash-resistant touch keypads on dishwashers and ovens with stainless-steel overlays and high ambient temperatures. IC Role / Device Role / Timing Role: Self-contained CapSense® subsystem managing up to 12 buttons; stores calibration offsets in flash to compensate for thermal drift. Use Value: Maintains consistent touch sensitivity from 25°C to 85°C ambient - eliminates recalibration during oven preheat cycles. |
Use Scenario: Non-backlit center-stack controls in EVs where EMI from inverters and battery systems challenges conventional touch solutions. IC Role / Device Role / Timing Role: EMI-hardened touch controller with spread-spectrum modulation and differential sensing - communicates status via LIN bus. Use Value: Passes ISO 11452-4 (BCI) testing at 200 mA injection current - ensures reliable operation near 800 V traction inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive-sensing microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C201A0-24LQXI | Same CapSense® engine and ISSP interface, but 8 KB flash, 512 B SRAM, and 16 I/O - no change in pinout or timing. | Required when firmware exceeds 4 KB or additional GPIO for LED feedback or status indicators is needed. | Select if future firmware growth or peripheral expansion is anticipated; identical layout compatibility reduces redesign risk. |
| STM32G031F8P6 | No integrated CapSense®; requires external RC network and software-based charge-transfer sensing - higher CPU load, lower SNR, no hardware auto-tuning. | Suitable only for cost-sensitive, low-channel-count (<4) touch applications with relaxed noise immunity requirements. | Choose only when leveraging existing STM32 toolchain and BOM consolidation outweighs CapSense® performance loss and added firmware validation effort. |
Compared with CY8C20045-24LKXIT, CY8C201A0-24LQXI offers headroom for feature-rich firmware without layout changes, while STM32G031F8P6 trades CapSense® hardware acceleration and noise resilience for ecosystem familiarity - making it viable only in non-industrial, low-noise contexts.
Availability
CY8C20045-24LKXIT is available at Aetrix Electronics and suitable for industrial HMI panels, medical device touch interfaces, consumer appliance keypads, and automotive cabin controls requiring stable component supply, long-term lifecycle support, and qualified industrial-grade operation.
Supply support for CY8C20045-24LKXIT 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 and supports the full PSoC portfolio, including legacy CapSense® devices. Infineon is a global semiconductor leader focused on power systems, automotive, and industrial control ICs.
CY8C20045-24LKXIT belongs to the PSoC® 1 CapSense® family, designed specifically for cost-optimized, low-power capacitive touch sensing in space-constrained embedded systems - emphasizing analog integration, noise immunity, and field-programmability without external components.
FAQ
Can CY8C20045-24LKXIT be programmed in-circuit by a host MCU without a dedicated programmer?
Yes. It supports Host Sourced Serial Programming (HSSP) using three signals - SDATA, SCLK, and XRES - driven by any host processor with GPIO and precise timing control. The HSSP code example (AN59389) provides portable C routines for porting to ARM, PIC, or other hosts, requiring only low-level pin manipulation and delay functions.
What is the minimum VDD required for reliable CapSense® operation?
The device operates down to 1.8 V, but CapSense® performance degrades below 2.7 V due to reduced IDAC drive strength and increased quantization noise. For production designs, 3.0–5.5 V is recommended to maintain >40:1 signal-to-noise ratio across all electrodes and temperature ranges.
Does CY8C20045-24LKXIT support wet-finger or gloved-finger touch detection?
Yes. Its Smart Sense™ algorithm includes configurable thresholds and adaptive baseline tracking that detect touch under 1 mm water overlay or 2 mm thick rubber gloves. This is implemented in hardware and requires no host CPU intervention - validated per IEC 61000-4-6 and IEC 60601-1-6 test conditions.
How is flash endurance affected if ISSP programming is performed outside the specified temperature range?
Programming outside 5–50°C ambient causes improper oxide stress during write/erase cycles, reducing flash endurance from the rated 10,000 cycles to as few as 1,000 cycles and shortening data retention from 20 years to <2 years. The device does not enforce temperature lockout - system-level monitoring is required.
CY8C20045-24LKXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 16-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Capacitive Sensing
- Core Processor:
- M8C
- Program Memory Type:
- -
- Controller Series:
- CY8C20045
- RAM Size:
- -
- Interface:
- -
- Number of I/O:
- -
- Voltage - Supply:
- 1.71V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
CY8C20045-24LKXIT FAQ
1.How can I place an order for CY8C20045-24LKXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20045-24LKXIT 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 CY8C20045-24LKXIT reliable?
The price and inventory of CY8C20045-24LKXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20045-24LKXIT is usually 5 days.
3.What payment methods are accepted for CY8C20045-24LKXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20045-24LKXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20045-24LKXIT?
CY8C20045-24LKXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20045-24LKXIT 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 CY8C20045-24LKXIT?
For technical support, including CY8C20045-24LKXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20045-24LKXIT requirements.
6.How does Aetrix verify that CY8C20045-24LKXIT is sourced from the original manufacturer or authorized distributors?
All CY8C20045-24LKXIT 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 CY8C20045-24LKXIT meets industry standards.
7.What is the process for return or replacement of CY8C20045-24LKXIT?
All CY8C20045-24LKXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20045-24LKXIT, 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 CY8C20045-24LKXIT part is unused and in its original packaging.
Return procedure for CY8C20045-24LKXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY8C20045-24LKXIT Tags
-
CYPD3175-24LQXQ
Infineon Technologies
-
SLB9672VU20FW1523XTMA1
Infineon Technologies
-
SLB9670VQ20FW785XTMA1
Infineon Technologies
-
SLB9672XU20FW1523XTMA1
Infineon Technologies
-
SLB9673XU20FW2613XTMA1
Infineon Technologies
-
CYPD3125-40LQXIT
Infineon Technologies
-
AT97SC3204-U2A1A-20
Microchip Technology
-
AT97SC3204-U2A1A-10
Microchip Technology
-
SLM9670AQ20FW1311XTMA1
Infineon Technologies
-
SLB9672XU20FW1613XTMA1
Infineon Technologies
-
SLB9672AU20FW1613XTMA1
Infineon Technologies
-
SLB9673AU20FW2613XTMA1
Infineon Technologies
Tech Hub
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…
Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …
Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
