81688-100AS71KAT

Overview

The CYAT81688-100AS71KH is a capacitive touchscreen controller from Infineon Technologies, part of the PSoC-based TrueTouch family. It operates within a supply voltage range of 1.71 V to 5.5 V and supports I2C and SPI interfaces. The device features a 32-bit resolution and includes four ADC inputs. Designed for surface mount installation, it is housed in a TQFP-100 package. The component functions reliably across an extended temperature range from -40°C to +105°C.

Feature Summary

• Capacitive touch sensing with 32-bit resolution
• Supports I2C and SPI communication protocols
• Integrated 4-channel ADC input capability
• Operates on supply voltages between 1.71 V and 5.5 V

Applications

• Automotive human-machine interface (HMI) displays
• Industrial control panels requiring wide temperature tolerance
• Consumer electronics with capacitive touch overlays

Procurement Notes

Verify the exact ordering suffix against the manufacturer's datasheet, as variations such as 'T' or 'Z' indicate different packaging formats like reels or trays. Confirm RoHS compliance status and moisture sensitivity levels prior to procurement. Ensure the specific variant matches the required operating temperature range and interface configuration for the target application design.

Selection Notes

Select this controller when a robust automotive-grade solution with wide voltage tolerance is required. The TQFP-100 package offers ample pin count for complex sensor arrays. Consider the -40°C to +105°C rating for harsh environments. Verify that the host system supports the necessary I2C or SPI speeds and that the 1.71V minimum voltage aligns with the system power rails.

Part Context

This component belongs to the Infineon TrueTouch Next Generation series, designed for high-performance capacitive sensing. It integrates processing capabilities typical of PSoC architectures, allowing for advanced gesture recognition and thick overlay support. The part is engineered to replace older resistive or simpler capacitive solutions in modern display applications.

Replacement Considerations

Direct replacements may include other variants within the CYAT81688 family, such as CYAT81688-100AA71T, noting differences in packaging (Reel vs. Tray) and maximum operating temperature (+85°C vs. +105°C). Cross-reference pinouts and firmware compatibility before substitution.