RTC Battery Configuration Detection Circuit
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Solution Overview
Problem
The existing detection methods for Real-Time Clock (RTC) batteries in electronic apparatuses require teardown inspections to determine if the RTC battery is properly configured, which is inefficient and can lead to false determinations due to reverse leakage from Schottky diodes, causing unnecessary power consumption and reducing detection accuracy.
Innovation Solution
A detecting circuit comprising a power capturing unit, a voltage dividing unit, and an output unit that captures and divides the power supply signal from the RTC battery, generating a detecting result signal indicating whether the RTC battery is in a normal or abnormal configuration state, thereby avoiding the need for teardown inspections and minimizing false positives from reverse leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If teardown inspection is used to detect RTC battery configuration status, then detection accuracy is improved, but inspection efficiency deteriorates and additional workload is created
Solution Approach 1:
The patent replaces the mechanical teardown inspection system with an electrical detection system. The detecting circuit uses electrical signals to detect the configuration status of the RTC battery through voltage measurement, eliminating the need for physical disassembly while maintaining detection accuracy.
Solution Approach 2:
The patent introduces a detecting circuit as an intermediary between the inspector and the RTC battery. This circuit acts as a mediator that provides detection information without requiring direct physical access to the battery, thus improving efficiency while maintaining accuracy.
2Reliability
If Schottky diode is used in the circuit, then power supply protection is improved, but reverse leakage causes false detection results
Solution Approach 1:
The patent extracts and addresses the reverse leakage issue by using a detecting circuit that measures voltage at a specific node before the Schottky diode. This allows detection of the RTC battery status without being affected by the diode's reverse leakage current.
Solution Approach 2:
The patent converts the potential harm of reverse leakage into a benefit by designing the detection circuit to measure voltage at a node that is not affected by the leakage. The reverse leakage current flows through a different path, allowing accurate detection of the battery status while the diode continues to provide protection.
3Ease of operation
If detecting circuit is continuously activated, then detection availability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic detection by controlling the detecting circuit to operate only when needed (e.g., during system initialization or when detection is requested). The circuit can be enabled and disabled through control signals, reducing power consumption while maintaining detection availability when required.
Data Source
AI summary
A detecting circuit and a configuration status detecting method of a Real-Time Clock (RTC) battery and an electronic apparatus using the same are provided. The detecting circuit includes a power capturing unit, a voltage dividing unit and an output unit. The power capturing unit couples to a power supply output terminal of the RTC battery and captures a power supply signal from the power supply output terminal in response to a detecting-controlled signal. The voltage dividing unit couples to the power capturing unit and is configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal. The output unit couples to the voltage dividing unit to receive the dividing signal, where the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal.