CAP1208-1-SL

Overview

The CAP1208-1-SL is an eight-channel capacitive touch sensor controller manufactured by Microchip Technology. It features programmable sensitivity, automatic recalibration for parasitic capacitance, and multiple pattern touch recognition. The device operates on a 3V to 5.5V supply with typical standby current of 50µA and deep sleep current of 5µA. It communicates via SMBus/I2C at frequencies up to 400kHz using the fixed address 0101_000. The component is housed in a 14-pin SOIC package (14-SOIC, 0.154 inch width) and supports an operating temperature range from -40°C to 125°C.

Feature Summary

• Eight individual capacitive touch sensor inputs with programmable sensitivity and automatic recalibration capabilities.
• Supports multiple button pattern detection and press-and-hold features for volume-like applications.
• Includes analog filtering, RF detection avoidance filters, and a digital EMI blocker for system noise reduction.
• Features low power operation with distinct Active, Standby, and Deep Sleep states controlled by host configuration.

Applications

• Desktop and Notebook PCs
• LCD Monitors
• Consumer Electronics
• Appliances

Procurement Notes

Verify the ordering suffix 'SL' corresponds to the 14-pin SOIC package variant when sourcing. Confirm the '-1' designation matches the required SMBus client address 0101_000(r/w). Ensure the procurement specification aligns with the RoHS compliant status and the specified 14-SOIC physical dimensions for PCB layout compatibility.

Selection Notes

Select this component for designs requiring eight independent touch channels with I2C/SMBus connectivity. Verify that the host controller supports the specific SMBus timeout and idle conditions defined in the protocol specifications. Ensure the application environment stays within the -40°C to 125°C operating temperature range and respects the 8kV HBM ESD rating requirements for all pins.

Part Context

The CAP1208 belongs to Microchip's family of capacitive touch sensor controllers. The -1 suffix specifically denotes the SMBus address configuration (0101_000), distinguishing it from other variants like the CAP1208-2 which uses address 0101_001. This part integrates sensing logic, calibration algorithms, and communication interfaces into a single IC for simplified system design.

Replacement Considerations

Direct functional replacements within the same family include the CAP1208-2-SL, provided the SMBus address conflict is resolved or the address is changed via hardware if supported. Other Microchip touch controllers may require significant firmware and hardware redesign due to differing pinouts and register maps.

FAQ

What is the SMBus address for the CAP1208-1?

The CAP1208-1 responds to the SMBus address 0101_000(r/w).

How does the device handle environmental changes?

Each sensor input is automatically recalibrated to compensate for gradual environmental changes and system parasitic capacitance.

What is the lowest power consumption state?

Deep Sleep is the lowest power state, drawing a typical current of 5µA with no sensor inputs active.