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Microchip Technology AT42QT1110-MUR
- Part No.:
- AT42QT1110-MUR
- Manufacturer:
- Microchip Technology
- Category:
- Sensor, Capacitive Touch
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT42QT1110-MUR.pdf
- Description:
- QTOUCH 11 KEY TOUCH SENSOR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,626
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Product details
Overview
AT42QT1110-MUR from Microchip Technology (formerly Atmel) is an 11-channel QTouch® capacitive touch sensor IC designed for robust, noise-immune human interface sensing in consumer and industrial electronics. It features spread-spectrum charge-transfer technology, 3–5.5 V operation, SPI slave interface up to 1.5 MHz, and supports both 11-key burst-mode sensing and 7-key stand-alone mode with discrete PWM detect outputs - deployed in TV front panels, media player controls, and appliance interfaces.
For engineers reviewing the AT42QT1110-MUR datasheet, AT42QT1110-MUR pinout, AT42QT1110-MUR application, or AT42QT1110-MUR equivalent, key selection considerations include its dual-mode configuration (11-key vs. 7-key), programmable key sensitivity per channel, Adjacent Key Suppression® (AKS®), moisture-tolerant firmware tuning, and EEPROM-stored setup persistence across power cycles.
Technical Context
The AT42QT1110-MUR implements patented burst-mode spread-spectrum charge-transfer sensing with self-calibration, auto-drift compensation, and hardware-accelerated AKS® to reject crosstalk between adjacent electrodes. Its acquisition engine supports sequential or parallel group measurement, triggered either by internal clock (free-run or timed cycle) or external SYNC input.
It operates as a full-duplex SPI slave (CPOL=1, CPHA=1) with 1.5 MHz max SCK, CRC-optional command/report protocol, and dedicated CHANGE pin for event-driven host wake-up. Stand-alone 7-key mode bypasses SPI entirely, driving six configurable PWM DETECT outputs (DETECT0–DETECT6) plus one additional detect line on pin 30.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Touch Channels | Up to 11 independent capacitive sense channels; 7-key mode enables discrete PWM detect outputs on pins 22–27 and 30. |
| Supply Voltage | 3.0 V to 5.5 V - compatible with standard logic rails; brownout detection threshold at 2.7 V ±10% triggers reset. |
| SPI Interface | Full-duplex slave mode, 1.5 MHz max clock (SCK), CPOL=1/CPHA=1; supports CRC-verified commands and reports. |
| Sensing Technology | Patented spread-spectrum charge-transfer (direct mode) with self-calibration, noise filtering, and AKS® suppression. |
| Key Sensitivity | Individually settable per channel via SPI; supports electrode sizes ≥6 mm × 6 mm on panels up to 10 mm glass / 5 mm plastic. |
| Package | 32-pin 5 × 5 mm QFN (RoHS-compliant); exposed thermal pad must be connected to ground. |
| Power Consumption | Typical sleep current <2 µA; active measurement current depends on acquisition rate and channel count. |
Pinout & Package
AT42QT1110-MUR is housed in a 32-pin, 5 mm × 5 mm QFN package with exposed thermal pad (must be soldered to GND plane). Pin 1 is located at top-left corner adjacent to notch or mark; pin numbering proceeds counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS0–SNS10K | Sense I/O | Capacitive electrode connections; each pair (e.g., SNS0/SNS0K) forms a differential sense node for noise rejection. |
| SS, MOSI, MISO, SCK | SPI Interface | Standard SPI slave signals; SS active-low enables communication; supports 1.5 MHz full-duplex transfers. |
| CHANGE | Open-drain Event Output | Asserts low on key state change (data mode) or presence (touch mode); used for interrupt-driven host wake-up. |
| RESET | Active-low Reset Input | Hardware reset; tied to VDD if unused; initiates full startup sequence including EEPROM load and self-test. |
| DETECT0–DETECT6 | Configurable PWM Outputs | Available only in 7-key mode; drive LEDs or logic with user-defined duty cycle (0–100%) per key. |
| VDD / VSS | Power & Ground | Dual VDD pins (pins 4, 18) and three VSS pins (5, 21, ?) ensure low-impedance supply routing; 0.1 µF ceramic bypass required near pins. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum charge-transfer | Reduces EMI emissions and improves immunity to RF interference and power supply noise without external shielding. |
| Adjacent Key Suppression® (AKS®) | Hardware-accelerated algorithm prevents false triggers when multiple keys are touched simultaneously or in proximity. |
| EEPROM-based configuration storage | Retains device setup (key thresholds, timing, modes) across power cycles - eliminates host re-initialization overhead. |
| Dual operational modes | 11-key SPI-controlled mode for flexible UIs; 7-key stand-alone mode enables plug-and-play LED-driven interfaces without MCU. |
| Moisture-tolerant firmware tuning | Enables reliable operation under condensation, sweat, or light liquid exposure via adaptive baseline tracking and signal filtering. |
Applications
| Consumer Media Controls | Industrial HMI Panels |
|---|---|
|
Use Scenario: Front-panel touch keys on flat-panel TVs, Blu-ray players, and streaming devices with non-metallic overlays. IC Role / Device Role / Timing Role: Primary capacitive touch controller managing up to 11 keys; handles raw data acquisition, debouncing, and status reporting over SPI. Use Value: Enables sleek, sealed bezel designs with no mechanical switches; supports varied electrode shapes (rings, rectangles) on 5 mm plastic overlays. |
Use Scenario: Operator interface on factory HMIs, medical equipment control surfaces, and building automation panels. IC Role / Device Role / Timing Role: Robust touch sensor with AKS® and moisture tolerance for environments with humidity, cleaning agents, or occasional splashes. Use Value: Maintains stable key detection despite temperature drift and panel contamination - reduces field failures in uncontrolled settings. |
| Appliance Control Interfaces | Smart Home Devices |
|
Use Scenario: Touch-sensitive cooktops, ovens, and washing machine control panels with painted or laminated glass fronts. IC Role / Device Role / Timing Role: Stand-alone 7-key mode drives PWM-connected status LEDs while detecting touch through 8 mm glass. Use Value: Eliminates need for external microcontroller in basic appliances; reduces BOM cost and firmware complexity. |
Use Scenario: Voice assistant remotes, smart thermostats, and lighting controllers requiring compact, low-power touch interfaces. IC Role / Device Role / Timing Role: Low-power sensor operating in deep sleep (<2 µA) until CHANGE pin interrupt wakes host MCU. Use Value: Extends battery life in coin-cell-powered devices; fast 100 µs wake time ensures responsive user interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT42QT1070-MU | 7-channel version; lacks SYNC pin and 11-key mode; smaller 20-pin QFN package. | Targeted for simpler UIs with ≤7 keys; no external trigger capability or guard channel support. | Select when board space is constrained and full 11-key flexibility is unnecessary. |
| CY8CMBR2016-LQXI | Cypress CapSense® device; 16-channel, I²C interface; integrated proximity sensing; higher integration but no discrete DETECT outputs. | Requires host MCU for all configuration; no stand-alone PWM output mode; different calibration architecture. | Choose for I²C-based systems needing more channels and proximity detection, accepting added software dependency. |
Compared with AT42QT1110-MUR, AT42QT1070-MU reduces channel count and feature set for cost-sensitive 7-key designs, while CY8CMBR2016-LQXI shifts to I²C and removes stand-alone operation - making AT42QT1110-MUR uniquely suited for hybrid SPI/standalone deployments requiring AKS®, moisture resilience, and EEPROM-persistent setup.
Availability
AT42QT1110-MUR is available at Aetrix Electronics and suitable for consumer media controls, industrial HMI panels, and appliance interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant QFN packaging.
Supply support for AT42QT1110-MUR 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
Microchip Technology acquired Atmel in 2016 and maintains full support for the QTouch® product family, delivering high-reliability analog/mixed-signal ICs for embedded sensing and control.
The AT42QT1110-MUR belongs to Microchip's QTouch® capacitive touch sensor line, engineered specifically for noise-immune, low-power, and moisture-tolerant human interface applications in cost-sensitive consumer and industrial products.
FAQ
What is the primary function of the AT42QT1110-MUR in a touch interface design?
The AT42QT1110-MUR serves as a dedicated capacitive touch sensor controller that acquires raw electrode signals, applies spread-spectrum charge-transfer sensing, performs real-time AKS® crosstalk suppression, and delivers debounced key status via SPI or discrete PWM outputs. Its role is to replace mechanical switches with reliable, sealed-touch interfaces - and it does so without requiring host MCU intervention for core sensing tasks in 7-key stand-alone mode.
Does the AT42QT1110-MUR support both SPI communication and stand-alone operation?
Yes, the AT42QT1110-MUR supports two distinct operational modes: full SPI-controlled 11-key mode for flexible UIs with host MCU coordination, and 7-key stand-alone mode where it loads configuration from internal EEPROM and drives six PWM DETECT outputs (plus one extra) directly - enabling touch functionality without any SPI connection or host firmware.
How does the AT42QT1110-MUR handle environmental challenges like moisture or EMI?
The AT42QT1110-MUR combats moisture via adaptive baseline tracking and firmware-tunable signal filtering, allowing reliable operation under condensation or light liquid exposure. For EMI, its patented spread-spectrum charge-transfer technique spreads energy across frequency bands, reducing peak emissions and improving immunity to RF interference and power supply noise - validated per IEC 61000-4-3 and -4-6 standards.
What are the key differences between the AT42QT1110-MUR and AT42QT1070-MU?
The AT42QT1110-MUR offers 11 sense channels, SYNC pin for external triggering, guard channel capability, and full EEPROM-based configuration storage - while the AT42QT1070-MU is limited to 7 channels, lacks SYNC/guard features, and uses a smaller 20-pin QFN. Both share QTouch® core algorithms, but AT42QT1110-MUR targets more complex, future-proofed UIs requiring scalability and flexibility.
Can the AT42QT1110-MUR drive LEDs directly, and how is PWM configured?
Yes - in 7-key mode, the AT42QT1110-MUR drives six dedicated DETECT outputs (pins 22–27) and one additional DETECT line (pin 30) with user-configurable PWM. Each output's duty cycle (0–100% in nine steps) is set via SPI setup addresses 9–15; enabling the corresponding bit in the Key to LED setup byte activates PWM output synchronized to key detect state.
AT42QT1110-MUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- QTouch™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Buttons
- Proximity Detection:
- No
- Number of Inputs:
- Up to 11
- LED Driver Channels:
- -
- Interface:
- SPI
- Resolution:
- 10 b
- Voltage - Supply:
- 3V ~ 5.5V
- Current - Supply:
- 10mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
AT42QT1110-MUR FAQ
1.How can I place an order for AT42QT1110-MUR through Aetrix?
Please submit a Request for Quotation (RFQ) for AT42QT1110-MUR 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 AT42QT1110-MUR reliable?
The price and inventory of AT42QT1110-MUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT42QT1110-MUR is usually 5 days.
3.What payment methods are accepted for AT42QT1110-MUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT42QT1110-MUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT42QT1110-MUR?
AT42QT1110-MUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT42QT1110-MUR 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 AT42QT1110-MUR?
For technical support, including AT42QT1110-MUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT42QT1110-MUR requirements.
6.How does Aetrix verify that AT42QT1110-MUR is sourced from the original manufacturer or authorized distributors?
All AT42QT1110-MUR 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 AT42QT1110-MUR meets industry standards.
7.What is the process for return or replacement of AT42QT1110-MUR?
All AT42QT1110-MUR units undergo pre-shipment inspection (PSI). If there is an issue with AT42QT1110-MUR, 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 AT42QT1110-MUR part is unused and in its original packaging.
Return procedure for AT42QT1110-MUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT42QT1110-MUR Tags
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IQS228B00000000TSR
Azoteq (Pty) Ltd
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MTCH101T-I/OT
Microchip Technology
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IQS323001CSR
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MTCH102T-I/MS
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IQS323001DNR
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