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Product Detailed Parameters
- Description：IC CTLR CAP TOUCH 12CH I2C 20QFN
- Series：-
- Mfr：Silicon Labs
- Package：Tube
- Type：Buttons, Slider
- Proximity Detection：Yes
- Number of Inputs：Up to 12
- LED Driver Channels：-
- Interface：I2C
- Resolution：-
- Voltage - Supply：1.8V ~ 3.6V
- Current - Supply：3.1mA
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-UFQFN Exposed Pad
- Supplier Device Package：20-QFN (3x3)
- Grade：-
- Qualification：-
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Overview
The CPT112S-A02-GM is a 12-channel capacitive touch controller from the TouchXpress family, manufactured by Silicon Labs. It provides an I2C interface for connecting up to twelve capacitive sensor inputs, supporting both button and slider configurations. The device is designed to simplify the integration of touch controls into embedded systems by handling signal processing internally. This specific part number indicates a Green-compliant package variant within the CPT112S series.
Feature Summary
- Supports up to 12 independent capacitive sensor channels
- Provides standard I2C communication interface for host connectivity
- Capable of detecting both single buttons and linear sliders
Applications
- Consumer electronics requiring capacitive user interfaces
- Industrial control panels with touch input requirements
- Home appliance control modules
Procurement Notes
This component has reached End-of-Life status as confirmed by official discontinuance notifications dated February 27, 2024. Availability is restricted to remaining stock or obsolete channels. Engineers must verify current supply chain sources carefully and prioritize immediate transition to alternative components to ensure long-term production stability.
Selection Notes
Designers should evaluate newer generations of capacitive touch controllers that offer updated feature sets and guaranteed long-term availability. When migrating from this legacy part, verify pin compatibility and software library support for the replacement device to minimize redesign efforts and maintain system functionality.
Part Context
The CPT112S belongs to Silicon Labs' TouchXpress fixed-function controller family, which targets applications needing simple touch integration without complex microcontroller programming. This series was positioned as a cost-effective solution for adding touch capabilities to devices using standard digital interfaces like I2C.
Replacement Considerations
Official substitutes include the CPT212S and CPT312S models, which provide similar channel counts and interface protocols while offering active manufacturing status.
