Touch Detection Chip With Dynamic Power Management
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Solution Overview
Problem
Existing touch control systems require additional ICs, increasing circuit area and power consumption due to larger leakage currents in control circuits, especially when the control circuit is turned on for extended periods.
Innovation Solution
A control chip integrating a touch detection circuit with a clock generation circuit, power providing circuit, and logic circuit that generates a clock signal and touch detection signal, allowing for reduced power consumption by providing core power only when a touch event occurs, thereby minimizing circuit area and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional touch detection IC is used, then the touch detection function is achieved, but the circuit area increases
Solution Approach 1:
The patent merges the touch detection circuit with the control chip into a single integrated unit. The touch detection circuit includes a touch detection module and a power management module that work together with the control chip's processor and memory, eliminating the need for a separate touch detection IC and reducing overall circuit area.
2Speed
If the control circuit is turned on continuously, then the touch detection response is fast, but the power consumption increases due to leakage currents
Solution Approach 1:
The patent implements dynamic power management where the control circuit transitions between different operational states. The power management module dynamically adjusts the power state of the control chip - keeping it in a low-power state during idle periods and rapidly activating it when touch events occur, thus maintaining fast response while minimizing leakage current consumption.
Solution Approach 2:
The touch detection circuit uses periodic sampling to monitor touch events while the control chip remains in a low-power state. The power management module periodically checks for touch events and only activates the full control circuit when necessary, reducing power consumption during extended idle periods while maintaining detection capability.
3Reliability
If the control circuit is turned on continuously, then the touch detection function is always active, but the power consumption increases
Solution Approach 1:
The power management module operates autonomously to manage the power states of the control chip. It continuously monitors touch events and automatically activates or deactivates the control circuit without requiring external intervention, ensuring the system remains responsive while minimizing power consumption during idle periods.
Data Source
AI summary
A control chip comprising: at least pin; a control circuit; a clock generation circuit, configured to generate a clock signal; a power providing circuit, configured to provide an always on power; a touch detection circuit, configured to receive the always on power, and configured to detect a touch event via the pin to generate a touch detection signal; a logic circuit, configured to receive the always on power, the clock signal and the touch detection signal, wherein the logic circuit controls the power providing circuit to provide a core power to the control circuit according to the touch detection signal. The control circuit is further configured to set the logic circuit such that the logic circuit can control the touch detection circuit. A related touch detection method is also discloses. Via the control chip and the touch detection method, the circuit area and the power consumption can be decreased.