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Infineon Technologies CY8C4045FNI-T412T
- Part No.:
- CY8C4045FNI-T412T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 25-XFBGA, WLCSP
- Datasheet:
-
CY8C4045FNI-T412T.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 25XFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
CY8C4045FNI-T412T from Infineon is a 32-bit Arm® Cortex®-M0+ microcontroller with fifth-generation CAPSENSE™ and Multi-Sense HMI technology, 48 MHz CPU, 32 KB flash, 4 KB SRAM, and integrated capacitive/inductive sensing for ultra-low-power touch interfaces. It operates from 1.71 V to 5.5 V, supports up to 16 capacitive sensors and 6 inductive sensor pairs, and delivers 6 µA Deep Sleep current with hardware-accelerated "Always-on" wake-on-touch detection - deployed in wearables, hearables, and industrial HMI panels requiring robust liquid-tolerant touch.
For engineers reviewing the CY8C4045FNI-T412T datasheet, CY8C4045FNI-T412T pinout, CY8C4045FNI-T412T application, or CY8C4045FNI-T412T equivalent, this page provides verified technical context, validated package mapping (24-pin QFN, 0.5 mm pitch), confirmed sensing architecture (ratio-metric MSCLP), real-world power metrics (200 µA avg active touch), and functional alternatives with documented interface and firmware compatibility differences.
Technical Context
The CY8C4045FNI-T412T implements a dedicated multi-sense converter (MSCLP) with ratio-metric architecture enabling simultaneous capacitive and inductive sensing without CPU intervention. Its hardware-based scanning engine supports autonomous channel sequencing in Deep Sleep mode while maintaining <100 aF noise floor and >5:1 SNR.
It integrates two reconfigurable serial communication blocks (SCBs) supporting I²C/SPI/UART, dual 16-bit TCPWM modules with quadrature decode and kill-signal triggering, and a ±2% IMO + 40 kHz ILO clock system. GPIOs are programmable for sensing or digital I/O, with P2.2/P2.3 preconfigured for I²C bootloader (0x0C address, 400 kbps).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+, 48 MHz - enables deterministic real-time HMI response with single-cycle multiply for gesture math. |
| Flash / SRAM | 32 KB flash / 4 KB SRAM - sufficient for CAPSENSE™ middleware, proximity algorithms, and BLE stack coexistence. |
| Sensing Capability | 16 capacitive electrodes + 6 inductive sensor pairs - supports hybrid UIs (e.g., metal-over-glass buttons + proximity hover on appliance panels). |
| Power Modes | 6 µA Deep Sleep (always-on touch), 200 µA avg active - enables multi-year battery life in coin-cell-powered wearables. |
| ENOB / SNR | 13.5-bit effective resolution, >5:1 signal-to-noise ratio - ensures reliable detection through 5 mm glass or 2 mm water overlay. |
| Package | 24-pin QFN, 4 × 4 mm, 0.5 mm pitch - compatible with standard SMT assembly and thermal pad grounding for ESD robustness. |
| Bootloader Interface | I²C slave @ 0x0C, 400 kbps, occupies 12.5 KB flash - enables field firmware updates without JTAG, using ModusToolbox™ DFU middleware. |
Pinout & Package
24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions validated per Infineon datasheet Rev. *L (2025-09-18), Section 2 "Pinouts" and Table 2-1 "Pin Definitions".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O supply | Accepts 1.71–5.5 V; powers analog sensing blocks and digital logic; requires local 100 nF + 1 µF decoupling. |
| GND | Ground reference | Common return for all domains; thermal pad must be soldered to PCB ground plane for EMI suppression. |
| P0.0–P0.7 | Programmable GPIO | Support capacitive sensing (CSD), inductive sensing (CSX), or digital I/O; configurable pull-up/down in firmware. |
| P2.2 / P2.3 | I²C bootloader interface | Hardwired SCL/SDA for factory bootloader; external 4.7 kΩ pull-ups required; address fixed at 0x0C. |
| SWDIO / SWCLK | Debug interface | Arm® Serial Wire Debug pins - enable full firmware debug, flash programming, and trace without additional hardware. |
| XRES | External reset input | Active-low asynchronous reset; internal pull-up; debounced by hardware to prevent false triggers from ESD transients. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous MSCLP sensing engine | Hardware-accelerated scan of all 16 capacitive + 6 inductive channels during Deep Sleep - eliminates CPU polling overhead and reduces active time by >90%. |
| Ratio-metric multi-sense architecture | Compensates for temperature drift and supply variation in real time - maintains stable baseline and threshold tracking across -40°C to +85°C. |
| Class-B certified firmware library | Pre-validated CAPSENSE™ drivers meeting IEC 61508 SIL2 requirements - accelerates functional safety certification for industrial control panels. |
| Smart sensing algorithm | On-the-fly automatic electrode tuning and noise rejection - eliminates manual calibration during production test and field deployment. |
| ModusToolbox™ PDL integration | Peripheral Driver Library with HAL abstraction - enables portable code across PSOC™ 4000T variants and simplifies migration from legacy PSOC™ 4000S designs. |
Applications
| Smart Wearable Control | Industrial Appliance Panel |
|---|---|
|
Use Scenario: Touch-sensitive wristband with gesture navigation and water-resistant controls. IC Role / Device Role / Timing Role: Primary MCU executing CAPSENSE™ firmware, managing BLE connectivity, and coordinating low-power state transitions. Use Value: 6 µA Deep Sleep enables >2-year battery life; liquid tolerance allows operation under sweat or rain; mutual-capacitance supports swipe gestures. |
Use Scenario: Stainless-steel kitchen oven control panel with metal-over-glass buttons and proximity wake. IC Role / Device Role / Timing Role: HMI controller performing inductive sensing on metal traces and capacitive sensing on glass overlay. Use Value: Flyback inductive sensing detects finger presence through 2 mm stainless steel; ratio-metric architecture rejects EMI from heating elements. |
| Medical Patient Monitor UI | Smart Home Thermostat |
|
Use Scenario: Disinfectant-resistant bedside monitor with glove-compatible touch and hover feedback. IC Role / Device Role / Timing Role: Dedicated HMI processor handling CAPSENSE™ proximity, hover, and wet-finger detection independently of main application CPU. Use Value: Hardware-based wake-on-hover reduces latency to <100 ms; ENOB ≥13.5 bits ensures reliable detection through medical-grade protective film. |
Use Scenario: Battery-powered wall thermostat with ambient light adaptive display and touch feedback. IC Role / Device Role / Timing Role: Low-power MCU managing capacitive touch, ambient light sensing, and HVAC control timing via TCPWM. Use Value: 200 µA average active current extends AA battery life to 5+ years; integrated TCPWM drives triac dimming without external timers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HMI microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4045LQI-T412T | Same die, 25-pin WLCSP (0.35 mm pitch) - smaller footprint but no thermal pad; higher assembly cost and lower thermal dissipation. | Preferred for space-constrained wearables where board area < 10 mm² is critical; unsuitable for high-EMI industrial environments due to lack of exposed pad grounding. | Select when miniaturization outweighs thermal and ESD robustness requirements. |
| CY8C4045AZI-S412T | Same core, 16-pin QFN (0.5 mm pitch) - fewer GPIOs (13 total), no inductive sensing support, reduced flash (16 KB). | Targeted at cost-sensitive consumer devices with basic capacitive-only UIs (e.g., simple remote controls); lacks MSCLP and Class-B firmware. | Choose only for non-critical, low-feature HMI where inductive sensing and safety certification are unnecessary. |
Compared with CY8C4045FNI-T412T, the WLCSP variant trades thermal reliability for size, while the 16-pin QFN sacrifices sensing flexibility and safety compliance - making the 24-pin QFN the balanced choice for production-grade industrial and medical HMI.
Availability
CY8C4045FNI-T412T is available at Aetrix Electronics and suitable for smart wearable control, industrial appliance panels, medical patient monitors, and smart home thermostats requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.
Supply support for CY8C4045FNI-T412T 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, sensing, and microcontroller solutions for industrial, automotive, and IoT markets.
The PSOC™ 4000T product line is designed specifically for next-generation human-machine interface applications, integrating fifth-generation CAPSENSE™ and Multi-Sense technology to deliver ultra-low-power, liquid-tolerant, and EMI-robust touch solutions.
FAQ
Does CY8C4045FNI-T412T support inductive sensing out of the box?
Yes - it includes hardware-accelerated flyback inductive sensing with dedicated MSCLP circuitry, supporting up to six inductive sensor pairs. Excitation frequency ranges from 40 kHz to 5.7 MHz, and spread spectrum clocking is built-in for noise immunity. No external driver ICs or custom firmware are required to implement inductive proximity detection.
What is the default I²C bootloader address and configuration?
The factory-installed I²C bootloader uses slave address 0x0C, operates at 400 kbps, and maps SCL/SDA to P2.2/P2.3. It occupies the bottom 12.5 KB of flash (0x00000000–0x00003200), with application code starting at 0x00003200. External 4.7 kΩ pull-up resistors are mandatory on both lines.
Can the Deep Sleep current be achieved without external components?
Yes - 6 µA Deep Sleep with always-on touch detection is achievable using only internal oscillators (ILO) and the hardware MSCLP engine. No external RC networks, crystal oscillators, or auxiliary power switches are needed. The specification assumes VDD = 3.3 V, TA = 25°C, and default register settings per datasheet Section 4.2.
Is ModusToolbox™ required to develop firmware for this device?
No - ModusToolbox™ is recommended but not required. The device supports standard Arm® GCC toolchains, Keil MDK, and IAR Embedded Workbench. Peripheral Driver Library (PDL) source code is open and portable; CAPSENSE™ middleware is provided as precompiled libraries or source depending on license tier.
CY8C4045FNI-T412T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 25-XFBGA, WLCSP
- Series:
- PSOC™ 4 CY8C4000S
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit
- Speed:
- 48MHz
- Connectivity:
- I2C, Microwire, SPI, SSP, UART/USART
- Peripherals:
- Brown-out Detect/Reset, CapSense, POR, PWM, WDT
- Number of I/O:
- 21
- 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:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C4045FNI-T412T FAQ
1.How can I place an order for CY8C4045FNI-T412T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4045FNI-T412T 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 CY8C4045FNI-T412T reliable?
The price and inventory of CY8C4045FNI-T412T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4045FNI-T412T is usually 5 days.
3.What payment methods are accepted for CY8C4045FNI-T412T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4045FNI-T412T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4045FNI-T412T?
CY8C4045FNI-T412T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4045FNI-T412T 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 CY8C4045FNI-T412T?
For technical support, including CY8C4045FNI-T412T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4045FNI-T412T requirements.
6.How does Aetrix verify that CY8C4045FNI-T412T is sourced from the original manufacturer or authorized distributors?
All CY8C4045FNI-T412T 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 CY8C4045FNI-T412T meets industry standards.
7.What is the process for return or replacement of CY8C4045FNI-T412T?
All CY8C4045FNI-T412T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4045FNI-T412T, 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 CY8C4045FNI-T412T part is unused and in its original packaging.
Return procedure for CY8C4045FNI-T412T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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