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Product Detailed Parameters
- Description：5 CHANNEL QTCH ADC I2C T-SNSR IC
- Series：QTouch™
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT),Cut Tape (CT)
- Type：Buttons
- Proximity Detection：Yes
- Number of Inputs：Up to 5
- LED Driver Channels：-
- 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 AT42QT1050-MMHR is a five-channel QTouchADC capacitive touch sensor IC manufactured by Microchip Technology. It supports configurations of one to five keys or up to four keys plus a guard channel. The device operates on a supply voltage range of 1.8 V to 5.5 V and features an I2C slave interface with a maximum clock rate of 400 kHz. It is available in a 12-ball WLCSP package, which corresponds to the MMHR suffix. Key signal processing includes self-calibration, auto-drift compensation, noise filtering, and Adjacent Key Suppression (AKS).
Feature Summary
- Patented spread-spectrum QTouchADC charge-transfer technology for enhanced noise immunity.
- Integrated signal processing including self-calibration, auto-drift compensation, and moisture tolerance.
- Configurable Adjacent Key Suppression (AKS) allowing tightly spaced key layouts.
- Low power operation with selectable Low Power and Deep Sleep modes.
Applications
- Consumer electronics requiring single-layer panel interfaces.
- Industrial control panels needing high environmental stability.
- Appliances utilizing plastic or glass covers up to specified thicknesses.
Procurement Notes
Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and tape-and-reel specifications. Ensure the component matches the required I2C address configuration via the ADDR_SEL pin during system design. Cross-reference the datasheet revision date to confirm firmware version compatibility.
Selection Notes
Select this model when a compact 12-ball WLCSP footprint is required for space-constrained designs. Confirm that the application requires a maximum of five sensing channels. Verify that the host controller supports the standard I2C protocol at 400 kHz. Evaluate if the internal signal processing capabilities meet the specific noise environment requirements without external components.
Part Context
This component belongs to the AT42QT10xx series of QTouch sensor drivers from Microchip Technology. It shares core algorithmic foundations with other models in the family but differs primarily in channel count and physical packaging options. The MMHR designation specifically identifies the WLCSP variant intended for surface-mount assembly.
Replacement Considerations
Direct replacements within the same package require verifying channel count and interface compatibility. Models such as the AT42QT1010 offer single-channel functionality in different packages. Higher channel counts are available in the AT42QT1070 or AT42QT2120 families, though these utilize distinct pinouts and may require PCB redesign.
