My Inquiry
My Account
Infineon Technologies CY8CMBR3108-LQXI
- Part No.:
- CY8CMBR3108-LQXI
- Manufacturer:
- Infineon Technologies
- Category:
- Sensor, Capacitive Touch
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
CY8CMBR3108-LQXI.pdf
- Description:
- IC CAP SENSE 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY8CMBR3108-LQXI from Infineon Technologies (formerly Cypress Semiconductor) is a register-configurable CapSense Express™ capacitive touch controller supporting up to 8 sensing inputs, SmartSense Auto-tuning, and I²C interface. It delivers >100:1 SNR, 0.1 pF sensitivity, and liquid-tolerant operation for buttons, sliders, and proximity sensing in industrial HMI applications.
For engineers reviewing the CY8CMBR3108-LQXI datasheet, CY8CMBR3108-LQXI pinout, CY8CMBR3108-LQXI application, or CY8CMBR3108-LQXI equivalent, key selection criteria include sensing input count (8), SmartSense auto-calibration capability, I²C slave support up to 400 kHz, deep-sleep current (22 µA/sensor), and QFN-24 package compatibility with overlay thickness up to 15 mm (glass).
Technical Context
The CY8CMBR3108-LQXI implements Capacitive Sigma Delta PLUS (CSD PLUS) sensing architecture with dedicated analog front-end channels and digital signal processing optimized for noise immunity. It integrates SmartSense Auto-tuning firmware that dynamically adjusts baseline, threshold, and sensitivity without host intervention.
It operates as an I²C slave device (7-bit address 0x38–0x3F) with wake-on-address-detect capability and supports system diagnostics including CMOD capacitor validation, CP out-of-range detection, and sensor short monitoring - all accessible via register reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Inputs | 8 independent capacitive sensing channels for buttons, sliders, or proximity sensors |
| Signal-to-Noise Ratio | >100:1 - enables reliable touch detection in high-noise industrial environments |
| Sensitivity | 0.1 pF minimum detectable change - supports thin overlays and fine-resolution sliders |
| I²C Interface | Up to 400 kHz clock rate; no bus-stalling or clock-stretching during transactions |
| Power Supply Range | 1.71 V to 5.5 V - compatible with single-supply battery or rail-powered systems |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded HMI deployment |
| Average Current (per sensor) | 22 µA at 120-ms refresh interval - enables multi-sensor UIs with low-power budget constraints |
Pinout & Package
The CY8CMBR3108-LQXI is housed in a 24-pin QFN package (4 × 4 × 0.6 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Cypress Datasheet 001-85330 Rev. *Q, Page 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 1.71–5.5 V main supply for analog/digital core and I/O |
| GND | Ground reference | Common return path for analog sensing and digital logic |
| SCL | I²C clock input | Open-drain input accepting standard I²C timing; supports wake-on-address match |
| SDA | I²C data bidirectional | Open-drain bidirectional line; no clock-stretching required during read/write |
| INT | Interrupt output | Active-low attention line signaling sensor state change to host processor |
| RES | Reset input | Active-low asynchronous reset; internal pull-up enabled |
| CP0–CP7 | Capacitive sensor inputs | Dedicated analog inputs for 8 sensing electrodes; support self- and mutual-capacitance configurations |
| GPO0–GPO7 | General-purpose outputs | Eight high-sink-current outputs (20 mA typical) for LED drive or buzzer control |
| AVOUT | Analog voltage output | Configurable 0–VDD output proportional to raw sensor count; used for diagnostics or analog feedback |
Key Features
| Feature | Design Value |
|---|---|
| SmartSense Auto-tuning | Real-time baseline and threshold adaptation eliminates manual tuning across temperature, humidity, and manufacturing variance |
| Liquid tolerance | Robust false-touch rejection under mist, droplets, or streaming water via dynamic CP compensation and FSS |
| Flanking Sensor Suppression (FSS) | Hardware-accelerated adjacent-button crosstalk cancellation for dense button layouts |
| System diagnostics | On-chip validation of CMOD value, sensor CP range (5–45 pF), and electrode shorts - reported via I²C registers |
| LED brightness control | Configurable ON-time and duty cycle per GPO channel for consistent visual feedback across varying supply voltages |
Applications
| Industrial Control Panel | Home Appliance UI |
|---|---|
Use Scenario: Touch-enabled operator interface on PLC-mounted HMIs with metal enclosures and EMI exposure. IC Role / Device Role / Timing Role: Capacitive sensing controller handling 8 buttons and 1 slider; provides interrupt-driven status updates to ARM Cortex-M host over I²C. Use Value: >100:1 SNR ensures reliable operation near variable-frequency drives; SmartSense maintains calibration across ambient temperature swings from –40 °C to +85 °C. | Use Scenario: Waterproof touch panel on washing machine or oven door with glass overlay up to 15 mm thick. IC Role / Device Role / Timing Role: Liquid-tolerant capacitive controller managing 6 buttons and 2 proximity zones; drives 8 LEDs via GPOs with programmable brightness. Use Value: Flanking Sensor Suppression prevents false actuation between closely spaced controls; dynamic CP compensation rejects water-induced drift. |
| Medical Device Keypad | Smart Building Sensor Node |
Use Scenario: Disinfectant-resistant touch interface on portable diagnostic equipment requiring glove operation and IP65-rated enclosure. IC Role / Device Role / Timing Role: Low-power CapSense controller with 8 sensing inputs and deep-sleep mode (wake-on-interrupt); interfaces to host MCU via I²C at 100 kHz. Use Value: 22 µA/sensor average current extends battery life; analog voltage output (AVOUT) enables real-time sensor health monitoring. | Use Scenario: Occupancy-aware lighting control node detecting hand proximity and gesture direction via 2-slider + 4-button layout. IC Role / Device Role / Timing Role: Proximity-optimized CapSense controller with SmartSense tuning for environmental drift; outputs status via INT line and raw data via I²C. Use Value: Proximity sensing range up to 50 mm (with 5 mm plastic overlay); configurable sensitivity per electrode enables adaptive zone sizing. |
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 algorithm; lower SNR (~60:1) | Lacks auto-tuning and liquid tolerance; requires manual calibration per unit | Preferred where cost sensitivity outweighs calibration labor and environmental robustness |
| STMPE1600QTR | 16-channel resistive/capacitive hybrid controller; no CSD algorithm; higher power (100 µA/sensor) | Designed for dual-mode (resistive + cap) panels; lacks proximity and liquid-tolerance features | Selected when legacy resistive overlay reuse or multi-technology flexibility is required |
Compared with AT42QT2120-MAHR and STMPE1600QTR, the CY8CMBR3108-LQXI offers superior noise immunity, automated calibration, and certified liquid tolerance - critical for unattended industrial and appliance deployments where field reliability outweighs marginal BOM cost savings.
Availability
CY8CMBR3108-LQXI is available at Aetrix Electronics and suitable for industrial control panels, home appliance UIs, medical device keypads, and smart building sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for CY8CMBR3108-LQXI 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, automotive, industrial, and security ICs, with global R&D and manufacturing infrastructure.
The CY8CMBR3xxx family was originally developed by Cypress Semiconductor and continues under Infineon's CapSense® portfolio to deliver turnkey, register-configurable capacitive touch solutions for rapid HMI development in cost-sensitive, high-reliability applications.
FAQ
What is the maximum overlay thickness supported by CY8CMBR3108-LQXI?
The CY8CMBR3108-LQXI supports up to 15 mm of glass or 5 mm of plastic overlay thickness, verified per datasheet Section 27. This capability stems from its 0.1 pF sensitivity and >100:1 SNR, enabling reliable detection through thick insulating layers without sacrificing response time or accuracy.
Does CY8CMBR3108-LQXI require external firmware development?
No. The CY8CMBR3108-LQXI is register-configurable via I²C and requires no firmware development. All CapSense functionality-including SmartSense tuning, LED control, and diagnostics-is managed internally. Configuration is performed using the EZ-Click Customizer GUI tool or direct register writes.
How does SmartSense Auto-tuning improve production yield?
SmartSense Auto-tuning dynamically compensates for PCB parasitic capacitance variation, sensor-to-sensor manufacturing tolerances, and environmental drift (temperature/humidity). This eliminates manual tuning per unit during production test, reducing calibration time and increasing first-pass yield in high-volume assembly.
Can CY8CMBR3108-LQXI drive LEDs directly without external drivers?
Yes. The device integrates eight high-sink-current GPOs (20 mA typical per pin) capable of directly driving standard LEDs. Brightness is controlled via programmable ON-time and duty cycle per channel, eliminating need for external current-limiting resistors or driver ICs in most implementations.
CY8CMBR3108-LQXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 16-UFQFN Exposed Pad
- Series:
- CAPSENSE™ Express™ SmartSense™
- Packaging:
- Tray
- 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-LQXI FAQ
1.How can I place an order for CY8CMBR3108-LQXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8CMBR3108-LQXI 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-LQXI reliable?
The price and inventory of CY8CMBR3108-LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8CMBR3108-LQXI is usually 5 days.
3.What payment methods are accepted for CY8CMBR3108-LQXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8CMBR3108-LQXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8CMBR3108-LQXI?
CY8CMBR3108-LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8CMBR3108-LQXI 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-LQXI?
For technical support, including CY8CMBR3108-LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8CMBR3108-LQXI requirements.
6.How does Aetrix verify that CY8CMBR3108-LQXI is sourced from the original manufacturer or authorized distributors?
All CY8CMBR3108-LQXI 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-LQXI meets industry standards.
7.What is the process for return or replacement of CY8CMBR3108-LQXI?
All CY8CMBR3108-LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8CMBR3108-LQXI, 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-LQXI part is unused and in its original packaging.
Return procedure for CY8CMBR3108-LQXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY8CMBR3108-LQXI Tags
-
IQS228B00000000TSR
Azoteq (Pty) Ltd
-
MTCH101T-I/OT
Microchip Technology
-
IQS323001CSR
Azoteq (Pty) Ltd
-
AT42QT1010-TSHR
Microchip Technology
-
AT42QT1012-TSHR
Microchip Technology
-
AT42QT1011-TSHR
Microchip Technology
-
CAP1206-1-SL-TR
Microchip Technology
-
MTCH102T-I/MS
Microchip Technology
-
IQS323001DNR
Azoteq (Pty) Ltd
-
AT42QT1070-SSUR
Microchip Technology
-
CAP1188-1-CP-TR
Microchip Technology
-
AT42QT1110-AUR
Microchip Technology
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
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…
