81688-100AS77KA

Overview

The Infineon Technologies 81688-100AS77KA is a capacitive touchscreen controller based on the PSoC architecture, utilizing the TrueTouch technology. It features an Arm Cortex CPU structure and supports CMOS input types with I2C and SPI interface protocols. The device operates within a power supply voltage range of 1.71 V to 5.5 V, consuming approximately 20 mA during operation. It includes four ADC inputs for signal processing and functions reliably across a temperature range of -40°C to +105°C. The component is housed in a TQFP-128 package suitable for surface mount installation.

Feature Summary

• Integrates TrueTouch capacitive touch sensing technology for robust user interface solutions
• Incorporates an Arm Cortex CPU for on-chip tactile and acoustic feedback processing
• Provides high noise immunity and system scalability for automotive applications

Applications

• Automotive infotainment systems requiring multi-touch capabilities
• Vehicle control panels needing tactile and acoustic feedback integration
• Industrial human-machine interfaces demanding high reliability

Procurement Notes

Verify the specific ordering suffix and package variant against official Infineon documentation to ensure compatibility with design requirements. Confirm moisture sensitivity levels and reflow soldering profiles prior to assembly. Cross-reference the manufacturer part number with current datasheets to validate active status and availability constraints.

Selection Notes

Select this controller for designs requiring integrated processing of touch, tactile, and acoustic signals within automotive environments. Consider the TQFP-128 package dimensions and thermal characteristics for PCB layout. Ensure interface compatibility with host processors supporting I2C or SPI protocols before finalizing the component choice.

Part Context

This component belongs to the CYAT81688 series of PSoC-based TrueTouch controllers designed for advanced automotive touch applications. It represents a generation of controllers that combine capacitive sensing with microcontroller capabilities to reduce external component count and simplify firmware development for complex user interfaces.

Replacement Considerations

Consult official Infineon substitution guides for verified alternatives. Check for pin-compatible variants within the same family that may offer updated packaging or enhanced performance specifications while maintaining functional equivalence.