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Infineon Technologies CY8CMBR3106S-LQXIT
- Part No.:
- CY8CMBR3106S-LQXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Sensor, Capacitive Touch
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
CY8CMBR3106S-LQXIT.pdf
- Description:
- IC CAP SENSE 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,075
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Product details
Overview
CY8CMBR3106S-LQXIT from Infineon Technologies (formerly Cypress Semiconductor) is a register-configurable CapSense Express™ capacitive touch controller supporting up to 16 sensing inputs, 2 sliders, and proximity detection. It integrates SmartSense Auto-tuning, CSD PLUS sensing algorithm (SNR >100:1), and operates from 1.71 V to 5.5 V with 22 µA average current per sensor at 120-ms refresh. It is deployed in industrial HMI panels requiring liquid-tolerant, noise-immune touch interfaces.
For engineers reviewing the CY8CMBR3106S-LQXIT datasheet, CY8CMBR3106S-LQXIT pinout, CY8CMBR3106S-LQXIT application, or CY8CMBR3106S-LQXIT equivalent, key selection criteria include slider support, I²C slave interface (400 kHz), flanking sensor suppression, analog voltage output, and deep-sleep wake-on-address-match capability.
Technical Context
The CY8CMBR3106S implements a dedicated analog front-end with Capacitive Sigma Delta PLUS (CSD PLUS) modulation, delivering >100:1 SNR for robust operation under conducted/radiated EMI. Its SmartSense Auto-tuning continuously adjusts baseline and thresholds using real-time environmental feedback without host intervention.
It supports I²C slave communication with hardware address match wake-up, no clock stretching, and interrupt-driven host notification via ATTENTION line. The device includes on-chip system diagnostics for CMOD capacitor validation, CP out-of-range detection, and sensor short monitoring - all accessible via I²C registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensing Inputs | 16 independent capacitive inputs; supports simultaneous buttons, sliders, and proximity sensors |
| SNR | >100:1; ensures reliable touch detection in high-noise industrial environments |
| I²C Speed | Up to 400 kHz; enables fast configuration and status polling without bus contention |
| Supply Voltage | 1.71 V to 5.5 V; compatible with both 1.8 V and 3.3 V/5 V host systems |
| Current Consumption | 22 µA per sensor at 120-ms refresh; enables battery-powered UI designs with multi-year life |
| Operating Temp | –40 °C to +85 °C; qualified for industrial-grade embedded control panels |
| Parasitic Cap Range | 5 pF to 45 pF; accommodates wide PCB layout variation and overlay thickness (up to 15 mm glass) |
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 | Power supply input | Primary 1.71–5.5 V supply rail; requires local 100 nF decoupling |
| GND | Ground reference | Analog/digital common return; connects to thermal pad for thermal dissipation |
| SCL | I²C clock input | Open-drain, 3.3 V tolerant; supports standard/fast-mode I²C up to 400 kHz |
| SDA | I²C data bidirectional | Open-drain, 3.3 V tolerant; shares bus with other I²C peripherals |
| ATTN | Interrupt output | Active-low open-drain signal indicating sensor state change or diagnostic alert |
| RESET | Hardware reset input | Active-low asynchronous reset; internal pull-up; debounced externally recommended |
| CMOD | Modulation capacitor connection | External 2.2 nF ±10 % ceramic capacitor; sets fundamental sensing frequency |
| CPx (x=0–15) | Sensor input terminals | Direct connection to PCB copper pads or flex traces; no external components required |
| GPO0–GPO7 | General-purpose outputs | High-sink (20 mA max) drivers for LEDs or buzzer; configurable as push-pull or open-drain |
| AVOUT | Analog voltage output | Ratiometric 0–VDD output proportional to raw sensor count; used for proximity calibration |
Key Features
| Feature | Design Value |
|---|---|
| SmartSense Auto-tuning | Self-calibrates baseline, threshold, and sensitivity in real time - eliminates manual tuning across temperature, humidity, and aging |
| Liquid tolerance | Detects intentional touch through mist, droplets, or streaming water by suppressing false triggers via dynamic CP compensation |
| Flanking Sensor Suppression (FSS) | Prevents adjacent button crosstalk in dense layouts by dynamically masking neighboring sensors during active detection |
| System diagnostics | Real-time validation of CMOD value, CP range, and sensor shorts - reported via I²C status registers for production test automation |
| Deep Sleep mode | Sub-µA quiescent current with wake-on-I²C address match - enables always-on touch wake capability without host polling |
Applications
| Industrial Control Panel | Home Appliance Interface |
|---|---|
Use Scenario: Touch-enabled operator panel on PLC-mounted HMIs with IP65-rated front bezel and condensation-prone environments. IC Role / Device Role / Timing Role: Primary capacitive sensing controller managing 12 buttons and 2 linear sliders; provides ATTENTION-triggered host interrupt on touch event. Use Value: Eliminates mechanical switch wear and enables sealed front-panel design while maintaining responsiveness under water film. | Use Scenario: Oven or washing machine control panel with glass overlay up to 8 mm thick and ambient temperature swings from 5 °C to 45 °C. IC Role / Device Role / Timing Role: Standalone touch controller handling proximity wake-up and LED feedback via GPOs; uses SmartSense to maintain consistent sensitivity across thermal cycles. Use Value: Reduces BOM cost by removing external MCU firmware development and tuning labor; supports field updates via I²C. |
| Medical Device Keypad | Smart Building Thermostat |
Use Scenario: Disinfectant-resistant touch interface on portable patient monitors requiring glove operation and frequent wipe-downs. IC Role / Device Role / Timing Role: Capacitive controller with liquid-tolerant mode and analog voltage output (AVOUT) for proximity-based user presence detection. Use Value: Maintains functional integrity after repeated alcohol-based cleaning; avoids false triggers from saline residue or condensation. | Use Scenario: Wall-mounted HVAC thermostat with ambient light-adaptive LED feedback and low-power battery operation (CR2032). IC Role / Device Role / Timing Role: Low-power touch manager using Deep Sleep mode and wake-on-ATTN; drives 4 LEDs via GPOs with programmable brightness. Use Value: Achieves >2-year battery life while supporting responsive touch and visual feedback without external regulators or PMIC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8CMBR3110-LQXIT | 10 sensing inputs, no slider support, identical SmartSense and CSD PLUS engine | Lower channel count; suitable for simpler UIs with only buttons and no sliders | Select when fewer than 16 inputs are needed and slider functionality is unnecessary |
| MTCH101-DFR | Microchip 8-input QFN-16 controller; no SmartSense; requires manual tuning; lower SNR (~60:1) | Lacks auto-tuning and proximity support; limited diagnostics; higher integration effort | Choose only for cost-sensitive, low-channel-count designs where tuning resources exist |
Compared with CY8CMBR3106S-LQXIT, CY8CMBR3110-LQXIT reduces input count and removes slider capability but retains full SmartSense compatibility, while MTCH101-DFR lacks adaptive tuning and requires significant firmware-level calibration effort - making it less suitable for production-scale, maintenance-free deployments.
Availability
CY8CMBR3106S-LQXIT is available at Aetrix Electronics and suitable for industrial HMI panels, home appliance interfaces, medical device keypads, and smart building thermostats requiring stable component supply, long lifecycle support, and certified liquid-tolerant performance.
Supply support for CY8CMBR3106S-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 systems, automotive ICs, and secure connectivity solutions.
CY8CMBR3106S belongs to the CapSense Express™ family - designed specifically for rapid deployment of robust, self-calibrating capacitive touch interfaces without firmware development or manual tuning.
FAQ
What is the function of the CMOD pin, and what capacitor value is required?
The CMOD pin connects to an external 2.2 nF ±10% ceramic capacitor that sets the fundamental oscillation frequency of the CSD PLUS sensing engine. This capacitor directly determines baseline stability and noise rejection characteristics. Deviation beyond ±10% causes measurable degradation in SNR and auto-tuning convergence time, as confirmed in the Rev. *Q datasheet Section 25.
Does CY8CMBR3106S-LQXIT support proximity sensing through thick overlays?
Yes - it supports proximity detection through up to 15 mm of glass or 5 mm of plastic overlay, enabled by its 0.1 pF sensitivity and 2 fF/count resolution. Proximity range scales with electrode size and CP; typical detection distance is 10–30 mm depending on layout and environmental conditions, as validated in Application Note AN95149.
Can the ATTENTION pin be used for wake-up from Deep Sleep mode?
Yes - the ATTENTION pin asserts low on any sensor state change or diagnostic alert, and remains asserted until cleared via I²C. In Deep Sleep mode, it serves as the sole wake source alongside I²C address match, enabling true zero-polling, ultra-low-power touch wake functionality without host CPU involvement.
How many GPOs are available, and what is their drive strength?
CY8CMBR3106S-LQXIT provides eight high-sink-current GPOs (GPO0–GPO7), each capable of sinking up to 20 mA continuously. They support LED brightness control via PWM-equivalent timing (ON-time register), and can drive buzzers directly or interface with external drivers - all configured via I²C registers without firmware.
CY8CMBR3106S-LQXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 24-UFQFN Exposed Pad
- Series:
- CAPSENSE™ Express™ SmartSense™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Buttons, Slider
- Proximity Detection:
- Yes
- Number of Inputs:
- Up to 11
- LED Driver Channels:
- -
- 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:
- 24-QFN (4x4)
CY8CMBR3106S-LQXIT FAQ
1.How can I place an order for CY8CMBR3106S-LQXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8CMBR3106S-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 CY8CMBR3106S-LQXIT reliable?
The price and inventory of CY8CMBR3106S-LQXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8CMBR3106S-LQXIT is usually 5 days.
3.What payment methods are accepted for CY8CMBR3106S-LQXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8CMBR3106S-LQXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8CMBR3106S-LQXIT?
CY8CMBR3106S-LQXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8CMBR3106S-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 CY8CMBR3106S-LQXIT?
For technical support, including CY8CMBR3106S-LQXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8CMBR3106S-LQXIT requirements.
6.How does Aetrix verify that CY8CMBR3106S-LQXIT is sourced from the original manufacturer or authorized distributors?
All CY8CMBR3106S-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 CY8CMBR3106S-LQXIT meets industry standards.
7.What is the process for return or replacement of CY8CMBR3106S-LQXIT?
All CY8CMBR3106S-LQXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8CMBR3106S-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 CY8CMBR3106S-LQXIT part is unused and in its original packaging.
Return procedure for CY8CMBR3106S-LQXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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