CAP1105-1-AIA-TR

Overview

The CAP1105-1-AIA-TR is a single-channel capacitive touch sensor controller manufactured by Microchip Technology. It operates within a supply voltage range of 2.7 V to 3.6 V and supports I2C communication interfaces. The device features an integrated oscillator, eliminating the need for external clock components. It includes programmable sensitivity settings and multiple wake-up sources to optimize power consumption in battery-operated applications. The component is housed in a compact 8-pin DFN package measuring 2 mm x 2 mm with a maximum height of 0.9 mm.

Feature Summary

• Single-channel capacitive sensing capability for intuitive user interface control
• Integrated internal oscillator reduces bill of materials and board space requirements
• Programmable sensitivity and filtering options for reliable operation in noisy environments
• Multiple interrupt and wake-up configurations support low-power system states

Applications

• Consumer electronics touch controls
• Industrial equipment operator panels
• White goods and home appliance interfaces
• Portable medical devices

Procurement Notes

Verify the specific suffix AIA-TR against official Microchip documentation to confirm tape-and-reel packaging and temperature grade. Ensure compatibility with existing I2C bus voltage levels and check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when a single touch input is required with minimal external circuitry. The integrated oscillator simplifies design compared to parts requiring external crystals. Verify that the application environment does not exceed the specified operating temperature range and that the I2C address conflicts are resolved in the system architecture.

Part Context

This part belongs to the CAP11xx family of capacitive touch controllers designed for low-cost, low-power applications. It serves as a direct replacement for legacy single-button touch solutions, offering improved noise immunity and configurable response times while maintaining a small footprint suitable for dense PCB layouts.

Replacement Considerations

Direct replacements include other single-channel capacitive sensors from the same manufacturer family, such as the CAP1106, which offers additional channels. Cross-reference pinouts and register maps carefully when substituting with multi-channel variants to ensure software compatibility.