CAP1293-1-SN

Overview

The CAP1293-1-SN is a three-channel capacitive touch sensor controller manufactured by Microchip Technology. It features three individual capacitive touch sensor inputs with programmable sensitivity and automatic recalibration for parasitic capacitance. The device supports proximity detection on one or more channels using an optional signal guard to reduce noise sensitivity. It includes multiple pattern touch recognition, power button support, and press-and-hold functionality. Power consumption varies by state: typical quiescent current is 5µA in Deep Sleep, 50µA in Standby with one sensor monitored, and up to 750µA during active sensing. It operates on a 3V to 5.5V supply and communicates via SMBus/I2C.

Feature Summary

• Three capacitive touch sensor inputs with programmable sensitivity and automatic recalibration
• Proximity detection capability with optional signal guard to isolate antennas from attenuation
• Multiple pattern touch recognition allowing simultaneous button detection with interrupt generation
• Low power operation with Deep Sleep mode drawing 5µA typical current

Applications

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

Procurement Notes

Verify the ordering suffix 'SN' corresponds to the 8-pin SOIC package as specified in the datasheet. Confirm RoHS compliance status and ensure the component matches the specific revision indicated in the most current datasheet version DS00001566B. Check for any applicable errata sheets that may describe operational differences or recommended workarounds for the silicon revision being procured.

Selection Notes

Select this component when a system requires three independent capacitive touch inputs combined with proximity sensing capabilities. The choice of the SOIC package is suitable for standard surface mount assembly processes. Ensure the host controller supports SMBus or I2C protocols and can handle the required pull-up resistors for the SMDATA and SMCLK lines. Consider the power budget if Deep Sleep wake-up latency or Standby sampling rates are critical constraints.

Part Context

The CAP1293 belongs to Microchip's family of capacitive touch sensor controllers, which also includes models like the CAP1296 and CAP1298 offering higher channel counts. This specific part provides a compact solution for applications needing basic touch and proximity functions without the complexity of multi-touch gesture processing found in larger arrays. It shares functional similarities with other devices in the series but is distinct in its three-channel configuration and specific pinout arrangement.

Replacement Considerations

Direct replacements within the same package and pinout include other variants of the CAP1293 family if available. For different channel counts, the CAP1296 (6-channel) or CAP1298 (8-channel) may require schematic and layout modifications due to pin count differences. Verify compatibility with existing firmware drivers designed for the SMBus/I2C interface and register map.