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Infineon Technologies CY8C4045LQI-S412
- Part No.:
- CY8C4045LQI-S412
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C4045LQI-S412.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
CY8C4045LQI-S412 from Infineon is a 32-bit Arm® Cortex®-M0+ microcontroller with 32 KB flash, 4 KB SRAM, and integrated CAPSENSE™ capacitive touch-sensing. It operates from 1.71 V to 5.5 V, supports Deep Sleep mode at 2.5 µA, and features two reconfigurable serial communication blocks (SCBs) for I²C/SPI/UART, five 16-bit TCPWMs, and up to 36 GPIOs. Used in human-interface embedded systems requiring robust touch control and low-power operation.
For engineers reviewing the CY8C4045LQI-S412 datasheet, CY8C4045LQI-S412 pinout, CY8C4045LQI-S412 application, or CY8C4045LQI-S412 equivalent, key selection criteria include CAPSENSE™ SNR (>5:1), SmartSense auto-tuning capability, Deep Sleep current, TCPWM kill-signal triggering, and SCB runtime reconfiguration - all confirmed in the official Infineon datasheet 002-00123 Rev. *Q.
Technical Context
The CY8C4045LQI-S412 implements a single-core Arm® Cortex®-M0+ CPU running at up to 48 MHz with single-cycle multiply, coupled with a programmable analog subsystem including two low-power comparators active in Deep Sleep and a sigma-delta CAPSENSE™ engine delivering >5:1 SNR. Its digital architecture integrates five TCPWM blocks supporting center-aligned, edge-aligned, and pseudo-random PWM modes with comparator-triggered kill signals for motor control safety.
System-level timing relies on multiple clock sources: ±2% internal main oscillator (IMO), 32 kHz watch crystal oscillator (WCO), and 32 kHz internal low-power oscillator (ILO). Two SCBs provide runtime-reconfigurable I²C/SPI/UART interfaces, while the I/O Subsystem enables any GPIO to serve as analog input, digital port, or CAPSENSE™ electrode with programmable drive strength and slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+, 48 MHz max - enables real-time firmware execution with deterministic interrupt latency for responsive touch and control loops. |
| Flash / SRAM | 32 KB flash with read accelerator / 4 KB SRAM - sufficient for CAPSENSE™ firmware, TCPWM control logic, and dual-SCB protocol stacks without external memory. |
| Operating Voltage | 1.71 V to 5.5 V - supports direct battery operation (e.g., 2×AA, Li-ion) and compatibility with industrial 3.3 V/5 V rails. |
| Deep Sleep Current | 2.5 µA digital system current - enables multi-year battery life in always-on touch interfaces like smart thermostats or remote controls. |
| CAPSENSE™ SNR | >5:1 signal-to-noise ratio - ensures reliable touch detection under moisture, noise, or ESD stress without firmware compensation. |
| TCPWM Blocks | Five 16-bit timer/counter/PWM units - support simultaneous motor phase control, LED dimming, and sensor timing with hardware kill-signal injection. |
| SCB Interfaces | Two reconfigurable serial blocks - allow dynamic switching between I²C (sensor hub), SPI (display driver), and UART (debug/logging) in one firmware image. |
Pinout & Package
CY8C4045LQI-S412 is housed in a 48-pin TQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are fully configurable via PSoC™ Creator or ModusToolbox™; all GPIOs support analog, digital, or CAPSENSE™ roles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0[0]–P0[7] | Port 0 GPIO bank | Supports CAPSENSE™ electrode, analog input, or high-drive digital output; programmable slew rate reduces EMI in noisy environments. |
| P1[0]–P1[7] | Port 1 GPIO bank | Includes dedicated SCB0 SDA/SCL or MOSI/MISO pins; configurable as LCD segment drivers for character displays. |
| P2[0]–P2[7] | Port 2 GPIO bank | Hosts TCPWM0–TCPWM4 outputs and comparator inputs; enables hardware-synchronized PWM and fault response. |
| P3[0]–P3[7] | Port 3 GPIO bank | Provides SCB1 TX/RX and WCO crystal connections; supports low-jitter timing reference for precision sensing. |
| VDD / VSS | Power supply / ground | Dual VDD/VSS pairs per side ensure stable core and I/O rail decoupling; thermal pad improves thermal dissipation in sealed enclosures. |
Key Features
| Feature | Design Value |
|---|---|
| SmartSense Auto-Tuning | Hardware-accelerated CAPSENSE™ calibration eliminates manual tuning across temperature/humidity - reduces firmware development time by ~70%. |
| Programmable Analog Blocks | Two IDACs and two low-power comparators operate in Deep Sleep - enable wake-on-touch with sub-µA active analog monitoring. |
| Runtime-Reconfigurable SCBs | Each SCB dynamically switches between I²C, SPI, and UART protocols without reset - simplifies BOM by consolidating interface ICs into MCU logic. |
| GPIO Flexibility | All 36 GPIOs support CAPSENSE™, analog, or digital roles with programmable drive strength (0.5–20 mA) - eliminates external level shifters or buffer ICs. |
| Kill-Signal PWM Triggering | TCPWM outputs halt immediately upon comparator threshold violation - meets functional safety requirements for motor-driven appliances without external watchdog ICs. |
Applications
| Smart Home Thermostat Interface | Industrial HMI Panel |
|---|---|
Use Scenario: Capacitive touch buttons and sliders on a wall-mounted HVAC controller operating continuously on 2×AA batteries. IC Role / Device Role / Timing Role: Primary MCU executing CAPSENSE™ scan, temperature PID loop, and wireless module UART interface. Use Value: 2.5 µA Deep Sleep current extends battery life beyond 5 years; SmartSense maintains button responsiveness across seasonal humidity swings. | Use Scenario: A DIN-rail mounted control panel with segmented LCD display, push-button navigation, and RS-485 communication to PLC. IC Role / Device Role / Timing Role: System controller managing LCD segment drive, CAPSENSE™ input, and SCB1 configured as RS-485 UART with automatic direction control. Use Value: GPIO flexibility allows direct LCD segment driving without external drivers; TCPWM kill signals protect relay outputs during overcurrent events. |
| White Goods Appliance Control | Medical Patient Monitor UI |
Use Scenario: Touch-enabled front panel for washing machine with water-resistant overlay and status LEDs. IC Role / Device Role / Timing Role: Main control MCU handling CAPSENSE™ with water tolerance, motor PWM generation, and LED dimming via TCPWM. Use Value: >5:1 CAPSENSE™ SNR prevents false triggers during condensation; center-aligned PWM ensures quiet, efficient motor commutation. | Use Scenario: Bedside patient monitor with touch-sensitive alarm silencer, biometric sensor interface, and audio alert output. IC Role / Device Role / Timing Role: Real-time controller acquiring analog sensor data, processing CAPSENSE™ gestures, and generating audible alerts via PWM-driven buzzer. Use Value: Dual low-power comparators monitor critical thresholds in Deep Sleep; SCB0 handles I²C sensor reads while SCB1 manages UART debug logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4045FNI-S402 | Same core and peripherals but in 40-pin QFN (6 mm × 6 mm); lacks WCO pins and has fewer GPIOs (28 vs. 36). | Suitable for space-constrained designs where crystal-less timing and reduced I/O count are acceptable. | Select when board area is critical and external RTC or software-based timing suffices. |
| CY8C4146LQI-S433 | Higher flash (64 KB), added USB 2.0 FS device controller, same 48-pin TQFP package and CAPSENSE™ v2 engine. | Required for designs needing host-side USB connectivity (e.g., firmware updates, HID devices) alongside touch control. | Choose when USB device functionality and extended code space justify higher cost and power. |
Compared with CY8C4045FNI-S402, the CY8C4045LQI-S412 offers full WCO support and 8 additional GPIOs for expanded peripheral routing; versus CY8C4146LQI-S433, it trades USB and extra flash for lower static power and cost - ideal for battery-powered touch-only applications.
Availability
CY8C4045LQI-S412 is available at Aetrix Electronics and suitable for smart home thermostats, industrial HMI panels, white goods control boards, and medical UI modules requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.
Supply support for CY8C4045LQI-S412 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 AG is a German semiconductor manufacturer specializing in power management, sensors, and microcontrollers for industrial, automotive, and IoT applications.
The PSoC™ 4000S product line delivers programmable mixed-signal MCUs optimized for capacitive touch interfaces, low-power human-machine interaction, and integrated analog/digital control - targeting cost-sensitive, high-volume embedded systems.
FAQ
What development tools support CY8C4045LQI-S412 firmware creation?
Infineon officially supports both ModusToolbox™ (cross-platform, Eclipse-based) and PSoC™ Creator (Windows-only, schematic-driven). ModusToolbox™ provides peripheral configurators, BSPs, and CAPSENSE™ middleware; PSoC™ Creator offers drag-and-drop hardware design with automatic analog/digital routing. Both generate production-ready C code compatible with GCC and Arm® toolchains.
Does CY8C4045LQI-S412 support hardware encryption or secure boot?
No. The CY8C4045LQI-S412 does not include hardware cryptographic accelerators, secure boot ROM, or flash lockbits beyond standard write protection. Security relies on firmware-implemented measures and external secure elements. For secure boot or AES acceleration, consider the PSoC™ 4100S or PSoC™ 6 families.
Can the CAPSENSE™ block operate independently during Deep Sleep mode?
Yes. The CAPSENSE™ sigma-delta sensing engine remains active in Deep Sleep mode using the ILO clock source, scanning electrodes at configurable intervals while the CPU and most peripherals remain powered down. Wake-up occurs only upon threshold crossing, maintaining 2.5 µA system current.
What is the maximum achievable PWM frequency using TCPWM blocks?
With a 48 MHz IMO clock and 16-bit counter resolution, the maximum TCPWM frequency is 750 kHz (48 MHz ÷ 64 prescaler ÷ 1 period). At lower resolutions (e.g., 8-bit), frequencies up to 187.5 kHz are achievable with 1:1 prescaler. Hardware kill-signal injection adds ≤2 clock cycles of latency for fault response.
CY8C4045LQI-S412 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- PSOC™ 4 CY8C4000S
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 48MHz
- Connectivity:
- I2C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART
- Peripherals:
- Brown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT
- Number of I/O:
- 27
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 5.5V
- Data Converters:
- A/D 1x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C4045LQI-S412 FAQ
1.How can I place an order for CY8C4045LQI-S412 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4045LQI-S412 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 CY8C4045LQI-S412 reliable?
The price and inventory of CY8C4045LQI-S412 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4045LQI-S412 is usually 5 days.
3.What payment methods are accepted for CY8C4045LQI-S412?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4045LQI-S412 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4045LQI-S412?
CY8C4045LQI-S412 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4045LQI-S412 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 CY8C4045LQI-S412?
For technical support, including CY8C4045LQI-S412 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4045LQI-S412 requirements.
6.How does Aetrix verify that CY8C4045LQI-S412 is sourced from the original manufacturer or authorized distributors?
All CY8C4045LQI-S412 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 CY8C4045LQI-S412 meets industry standards.
7.What is the process for return or replacement of CY8C4045LQI-S412?
All CY8C4045LQI-S412 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4045LQI-S412, 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 CY8C4045LQI-S412 part is unused and in its original packaging.
Return procedure for CY8C4045LQI-S412:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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