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Product Detailed Parameters
- Description：IC TOUCH SENSOR 7KEY 20VQFN
- Series：QTouch™
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT),Cut Tape (CT)
- Type：Buttons
- Proximity Detection：No
- Number of Inputs：Up to 7
- LED Driver Channels：Up to 5
- Interface：I2C
- Resolution：-
- Voltage - Supply：1.8V ~ 5.5V
- Current - Supply：-
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-VFQFN Exposed Pad
- Supplier Device Package：20-VQFN (3x3)
- Grade：-
- Qualification：-
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Overview
The AT42QT1070-MMHR is a seven-channel QTouch capacitive sensor driver manufactured by Microchip Technology. It supports Comms mode (I2C interface, up to 7 keys) and Standalone mode (discrete outputs, up to 4 keys plus a fixed Guard Channel on Key 0). The device operates on a 1.8 V to 5.5 V supply and features patented spread-spectrum charge-transfer technology for noise immunity. It includes signal processing functions such as self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression (AKS). The component is available in 14-pin SOIC and 20-pin VQFN packages.
Feature Summary
- Patented spread-spectrum charge-transfer technology for enhanced noise suppression
- Configurable Comms and Standalone operating modes with flexible key mapping
- Integrated signal processing including self-calibration and automatic drift compensation
- Supports Adjacent Key Suppression (AKS) to prevent false triggers on tightly spaced keys
Applications
- Consumer appliance control panels
- Industrial human-machine interfaces (HMI)
- Medical device touch interfaces
- Home automation keypads
Procurement Notes
Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and tape/reel specifications. Ensure the I2C address matches system requirements, as it is preset. Confirm environmental compliance status via the official datasheet before integration.
Selection Notes
Select this component when a dedicated touch controller is required to offload processing from the main MCU. Choose Comms mode for complex configurations and Standalone mode for simpler, cost-sensitive designs. Ensure electrode materials and panel thicknesses fall within the specified limits for reliable operation.
Part Context
This part belongs to the AT42QT1070 series of QTouch capacitive sensor ICs. It is designed to replace mechanical switches in modern electronic devices. The MMHR suffix typically indicates a specific packaging variant, such as tape and reel, suitable for automated surface-mount assembly processes.
Replacement Considerations
Check for direct pin-to-pin replacements within the same QTouch family. Verify that any substitute component supports the required number of channels and interface protocols. Ensure the alternative offers comparable noise immunity and power consumption characteristics.
