ADC data processing circuit of touch controller

By using a signal processing architecture with multiplexers and coefficient accumulators in a multi-channel touchscreen controller, the problem of invalid ADC samples caused by signal distortion is solved, enabling continuous processing without buffered storage while maintaining processing speed and accuracy.

CN122152151APending Publication Date: 2026-06-05STMICROELECTRONICS INT NV
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Patent Information

Application Number
CN202511829719.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-12-05
Filing Date
2025-12-05
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In multi-channel touchscreen controllers, signal distortion and saturation caused by interference sources result in invalid ADC samples. Existing technologies require buffering or pausing the processing, leading to increased processing latency and hardware complexity.

Method used

A signal processing architecture based on multiplexers is adopted. By comparing ADC samples with a saturation threshold, zero values ​​are selected to replace invalid samples and the coefficient values ​​are accumulated in the coefficient accumulator until a valid sample is detected and processing resumes.

Benefits of technology

It enables continuous signal processing without buffer storage under invalid data conditions, maintaining consistent processing speed and accuracy, and avoiding increased processing latency and hardware complexity.

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Abstract

The invention relates to an ADC data processing circuit for a touch controller. According to one embodiment, a signal processing circuit includes a coefficient accumulator and a dual multiplexer path for processing invalid ADC samples in a touch controller. When ADC samples exceed a saturation threshold, the circuit selects a zero value through one multiplexer, while accumulating coefficients through another multiplexer path. After receiving the first valid sample, the circuitry multiplies it by the accumulation coefficient and then resumes normal coefficient processing. The architecture enables continuous processing across multiple touch sensor channels, without buffering, while maintaining mathematical equivalence through a multiplicative allocation rate.
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