CYAT81685-100AS77

Touch Screen Controllers Overview

The CYAT81685-100AS77 is a capacitive touchscreen controller from Infineon Technologies, part of the TrueTouch PSOC family. It integrates an ARM Cortex CPU for advanced touch processing. The device supports I2C and SPI interfaces with CMOS input types. Electrical specifications include a supply voltage range of 1.71 V to 5.5 V and a maximum operating current of 20 mA. It features four ADC inputs and offers 32-bit resolution. The component operates within a temperature range of -40°C to +105°C and is housed in a TQFP-100 surface-mount package.

Touch Screen Controllers Feature Summary

• Integrated ARM Cortex CPU for programmable touch control
• Dual interface support: I2C and SPI
• Wide operating temperature range up to +105°C
• Four dedicated ADC inputs

Touch Screen Controllers Applications

• Capacitive touchscreen systems requiring high reliability
• Industrial control panels with extended temperature requirements
• Automotive infotainment displays

Touch Screen Controllers Procurement Notes

Verify moisture sensitivity levels before handling, as the component is classified as sensitive. Confirm the specific suffix 'S77' corresponds to the required tape-and-reel or tray packaging configuration for your assembly line. Ensure the ordering quantity aligns with the manufacturer's standard factory pack size of 900 units to avoid partial reel issues.

Touch Screen Controllers Selection Notes

Select this model when an operating temperature up to +105°C is necessary, distinguishing it from variants limited to +85°C. The TQFP-100 package requires adequate PCB space for its pin count. Verify that the host system can accommodate the 20 mA typical operating current and that the 1.71 V minimum supply voltage meets the system's power rail capabilities.

Touch Screen Controllers Part Context

This component belongs to the CYAT81685 series, which utilizes PSoC technology to combine analog touch sensing with digital processing. The 'TrueTouch' branding indicates specialized algorithms for gesture recognition and noise immunity. It serves as a direct upgrade path for legacy touch controllers needing higher processing power and wider thermal tolerance.

Touch Screen Controllers Replacement Considerations

The CYAT81688-100AA77Z is a related variant within the same ecosystem but differs in operating temperature (-40°C to +85°C) and suffix designation. Cross-checking the thermal rating and package marking is essential before substitution.