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Infineon Technologies CY8CMBR3108-LQXIT
- Part No.:
- CY8CMBR3108-LQXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Sensor, Capacitive Touch
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
CY8CMBR3108-LQXIT.pdf
- Description:
- IC CAP SENSE 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,566
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Product details
Overview
CY8CMBR3108-LQXIT from Infineon Technologies (formerly Cypress) is a register-configurable CapSense Express™ capacitive touch controller supporting up to 8 sensing inputs, SmartSense Auto-tuning, and I²C slave interface at up to 400 kHz. It delivers >100:1 SNR, 0.1 pF sensitivity, and liquid-tolerant operation for robust button/slide/proximity interfaces in industrial HMI and consumer control panels.
For engineers reviewing the CY8CMBR3108-LQXIT datasheet, CY8CMBR3108-LQXIT pinout, CY8CMBR3108-LQXIT application, or CY8CMBR3108-LQXIT equivalent, key selection criteria include its 8-input capacity, auto-tuned CSD PLUS sensing algorithm, deep-sleep power mode (22 µA/sensor @ 120 ms), industrial temperature range (–40 °C to +85 °C), and QFN-16 package compatibility with PCB layout guidelines for parasitic capacitance (5–45 pF).
Technical Context
The CY8CMBR3108-LQXIT implements Capacitive Sigma Delta PLUS (CSD PLUS) sensing with patented analog front-end architecture, enabling high-resolution capacitance measurement down to 0.1 pF and immunity to conducted/radiated noise. Its SmartSense Auto-tuning continuously adjusts baseline and thresholds in real time to compensate for environmental drift and manufacturing variation.
It operates as an I²C slave (7-bit address, no clock stretching), supports wake-on-hardware address match, and integrates system diagnostics for CMOD capacitor validation, sensor short detection, and CP out-of-range monitoring - all configurable via 8-bit registers accessible over I²C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Inputs | 8 independent capacitive channels - supports buttons, sliders, or proximity sensors without firmware |
| SNR | >100:1 - ensures reliable touch detection in noisy industrial environments with minimal false triggers |
| Sensitivity | 0.1 pF resolution - detects sub-millimeter finger proximity through 15 mm glass or 5 mm plastic overlays |
| I²C Speed | Up to 400 kHz - enables fast host polling and low-latency status updates in real-time UI systems |
| Power Consumption | 22 µA per sensor at 120-ms refresh - allows battery-powered operation for multi-year lifespan in remote controls |
| Operating Voltage | 1.71 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V host logic without level-shifting |
| Temperature Range | –40 °C to +85 °C - qualified for industrial and automotive cabin applications without derating |
Pinout & Package
Package: 16-pin QFN (3 × 3 × 0.6 mm), wettable flank, RoHS-compliant, thermal pad exposed on bottom.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage input | Primary power rail (1.71–5.5 V); must be decoupled with 100 nF ceramic near pin |
| GND | Ground reference | Analog/digital common return; connects to thermal pad for thermal dissipation |
| SCL | I²C clock input | Open-drain, 3.3 V tolerant; requires external pull-up to VDD |
| SDA | I²C data bidirectional | Open-drain, 3.3 V tolerant; shares pull-up with SCL |
| INT | Interrupt output | Active-low open-drain attention line signaling sensor state change to host MCU |
| AXRES | Asynchronous reset input | Pull-low to force hardware reset; internal weak pull-up enabled when not asserted |
| GPO0–GPO7 | General-purpose outputs | Eight high-sink current drivers (20 mA max each) for LED feedback or buzzer control |
| CP0–CP7 | Capacitive sensor inputs | Dedicated analog pins for connecting electrodes; require trace length & spacing per Design Toolbox guidelines |
Key Features
| Feature | Design Value |
|---|---|
| SmartSense Auto-tuning | Eliminates manual calibration by dynamically adjusting sensor thresholds and baselines during runtime and across temperature/humidity shifts |
| Liquid tolerance | Rejects false touches from mist, droplets, or streaming water via adaptive baseline tracking and FSS logic |
| Flanking Sensor Suppression (FSS) | Prevents adjacent button crosstalk in dense layouts by disabling neighboring sensors during active detection |
| System diagnostics | Real-time validation of CMOD value, CP range (5–45 pF), and sensor shorts - reported via I²C status registers |
| LED brightness control | User-configurable ON-time per GPO channel (0–255 counts), enabling graded visual feedback intensity |
Applications
| Home Appliance Control Panel | Industrial Human-Machine Interface |
|---|---|
Use Scenario: Touch-sensitive cooktop, oven, or dishwasher control panel exposed to steam, splashes, and cleaning agents. IC Role / Device Role / Timing Role: Primary capacitive sensor controller managing 6 buttons + 2 proximity zones; provides interrupt-driven status to host MCU. Use Value: Liquid-tolerant operation prevents false actuation during cleaning; SmartSense maintains consistent response across temperature swings from ambient to 60 °C surface heat. | Use Scenario: Factory-floor operator terminal with metal bezel, EMI-rich environment, and glove-compatible touch requirements. IC Role / Device Role / Timing Role: Standalone touch interface processor handling 8 buttons and slider navigation; communicates over I²C to PLC or ARM host. Use Value: >100:1 SNR rejects motor-drive noise; 0.1 pF sensitivity enables reliable detection through thick glass overlay and work gloves. |
| Smart Thermostat Interface | Medical Device Keypad |
Use Scenario: Wall-mounted HVAC thermostat with ambient temperature fluctuations and condensation risk. IC Role / Device Role / Timing Role: Low-power capacitive controller managing 4 buttons + 1 slider; enters deep sleep between 120-ms scans. Use Value: 22 µA/sensor average current extends battery life beyond 5 years; SmartSense compensates for seasonal humidity drift without recalibration. | Use Scenario: Sterilizable patient monitor keypad requiring sealed, non-mechanical input and diagnostic traceability. IC Role / Device Role / Timing Role: Safety-critical touch interface with built-in self-test (BIST) and CP/CMOD fault reporting via I²C. Use Value: System diagnostics detect electrode degradation or moisture ingress before failure; GPOs drive status LEDs compliant with IEC 62304 Class B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT42QT2120-MAHR | 12-channel QTouch controller; no SmartSense; fixed threshold tuning; lower SNR (~70:1) | Lacks auto-tuning and liquid tolerance; requires manual calibration per unit; less suited for humid or variable-overlay environments | Select when cost sensitivity outweighs need for field adaptability and long-term stability |
| STM32F070CBT6 + Touch Library | ARM Cortex-M0 MCU with software-based touch; requires firmware development and tuning effort | Offers full GPIO flexibility and mixed-signal integration but increases BOM count, validation time, and SW maintenance overhead | Select when existing STM32 ecosystem and multi-function integration justify added development cycle |
Compared with AT42QT2120-MAHR and STM32F070CBT6, the CY8CMBR3108-LQXIT delivers faster time-to-market via zero-firmware configuration, superior noise immunity in harsh settings, and guaranteed liquid tolerance - making it optimal for volume production of sealed, maintenance-free HMI systems.
Availability
CY8CMBR3108-LQXIT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMIs, smart thermostats, and medical device keypads requiring stable component supply and long-lifecycle support.
Supply support for CY8CMBR3108-LQXIT 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, and connectivity solutions for industrial, automotive, and IoT applications.
The CY8CMBR3xxx family was originally developed by Cypress Semiconductor and continues under Infineon's portfolio to deliver turnkey, register-configurable capacitive touch controllers targeting rapid HMI deployment in cost-sensitive, high-reliability applications.
FAQ
What is the maximum overlay thickness supported by CY8CMBR3108-LQXIT?
The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness while maintaining reliable touch detection. This capability is enabled by its 0.1 pF sensitivity and CSD PLUS sensing algorithm, which resolves minute capacitance changes even through thick insulating layers - verified per Cypress Design Guide AN92239.
Does CY8CMBR3108-LQXIT require external firmware development?
No. It is a register-configurable CapSense Express controller with factory-programmed firmware. All functionality - including button mapping, sensitivity, LED timing, and diagnostics - is set via I²C-accessible configuration registers using the EZ-Click Customizer tool, eliminating custom code development.
How does SmartSense Auto-tuning improve production yield?
SmartSense eliminates manual tuning per unit by automatically calibrating baseline, thresholds, and compensation parameters during power-up and runtime. This reduces production test time, removes subjectivity in tuning, and ensures consistent performance across manufacturing lots and environmental conditions - validated in Cypress Application Note AN91828.
Can CY8CMBR3108-LQXIT drive LEDs directly without external transistors?
Yes. Its eight GPOs support up to 20 mA sink current each, sufficient to drive standard 20 mA LEDs directly. The EZ-Click tool allows per-channel ON-time configuration (0–255 counts), enabling adjustable brightness and visual feedback without additional driver circuitry.
CY8CMBR3108-LQXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 16-UFQFN Exposed Pad
- Series:
- CAPSENSE™ Express™ SmartSense™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Buttons
- Proximity Detection:
- Yes
- Number of Inputs:
- Up to 8
- LED Driver Channels:
- Up to 4
- Interface:
- I2C
- Resolution:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Current - Supply:
- 140mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
CY8CMBR3108-LQXIT FAQ
1.How can I place an order for CY8CMBR3108-LQXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8CMBR3108-LQXIT 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 CY8CMBR3108-LQXIT reliable?
The price and inventory of CY8CMBR3108-LQXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8CMBR3108-LQXIT is usually 5 days.
3.What payment methods are accepted for CY8CMBR3108-LQXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8CMBR3108-LQXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8CMBR3108-LQXIT?
CY8CMBR3108-LQXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8CMBR3108-LQXIT 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 CY8CMBR3108-LQXIT?
For technical support, including CY8CMBR3108-LQXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8CMBR3108-LQXIT requirements.
6.How does Aetrix verify that CY8CMBR3108-LQXIT is sourced from the original manufacturer or authorized distributors?
All CY8CMBR3108-LQXIT 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 CY8CMBR3108-LQXIT meets industry standards.
7.What is the process for return or replacement of CY8CMBR3108-LQXIT?
All CY8CMBR3108-LQXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8CMBR3108-LQXIT, 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 CY8CMBR3108-LQXIT part is unused and in its original packaging.
Return procedure for CY8CMBR3108-LQXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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