Oscillator Reset Circuit for Standby Wake-Up Data Reload

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Solution Overview

Problem

Existing power-on reset circuits in circuit devices fail to reset properly during instantaneous interruptions in standby mode, leading to potential incorrect reloading of setting data and increased consumption current.

Innovation Solution

A circuit device with a reset circuit that transitions from active to inactive when shifting from standby mode to normal operating mode, ensuring correct reloading of characteristic adjustment data from non-volatile memory into storage, and enabling the reset circuit to be disabled in standby mode to reduce consumption current.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the power-on reset circuit operation is stopped in standby mode to reduce consumption current, then consumption current is reduced, but the circuit device cannot be reset when instantaneous interruption occurs and setting data may become improper

Engineering Contradiction:

Improveconsumption currentVSAvoidreset function reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The reset circuit is divided into two operational modes: a first operation mode during normal operation where the reset signal is active and reloading occurs, and a second operation mode during standby where the reset signal is inactive and reloading is prevented. This segmentation allows the system to reduce consumption current in standby mode while maintaining reset functionality when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reset circuit dynamically changes its operational state based on the oscillation circuit's mode. When the oscillation circuit transitions from standby mode to normal operation mode, the reset circuit automatically activates the reset signal to transition from inactive to active state, enabling automatic reloading of setting data without requiring external intervention.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the reset circuit remains active in standby mode to ensure proper resetting, then reset reliability is maintained, but consumption current cannot be reduced

Engineering Contradiction:

Improvereset function reliabilityVSAvoidconsumption current

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The reset circuit operation is segmented into distinct phases: during standby mode, only essential monitoring functions remain active while the reset signal generation and data reloading functions are deactivated; when normal operation mode is detected, the reset circuit fully activates to perform resetting and reloading operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reset circuit automatically detects the operational mode of the oscillation circuit and self-adjusts its activity state. When the oscillation circuit exits standby mode, the reset circuit autonomously activates the reset signal and initiates reloading of setting data without requiring external control signals, thereby reducing consumption current while maintaining reliability.

Inventive Principle:

Principle #25Self-service

3Reliability

If setting data is reloaded from non-volatile memory upon returning from standby mode, then correct operation is ensured, but circuit complexity increases

Engineering Contradiction:

Improvesetting data integrityVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reset functionality and the setting data reloading functionality are merged into a single integrated operation. The same reset signal that ensures proper circuit resetting also triggers the reloading of setting data from non-volatile memory to the storage circuit, eliminating the need for separate control mechanisms and reducing overall circuit complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reset circuit serves multiple functions: it generates the reset signal for circuit resetting, detects the operational mode of the oscillation circuit, controls the timing of data reloading, and coordinates the transition between standby and normal operation modes. This multi-functionality reduces the need for additional dedicated circuits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10797645B2Circuit device, oscillator, electronic apparatus, and vehicle

Publication Date: 2020.10.06 SEIKO EPSON CORP

AI summary

A circuit device has a first mode in which the circuit device outputs a clock signal and a second mode in which the circuit device does not output the clock signal. The circuit device includes an oscillation circuit, a non-volatile memory in which characteristic adjustment data of the oscillation circuit is stored, a reset circuit generating a reset signal, and a storage circuit into which the characteristic adjustment data is loaded from the non-volatile memory when the reset signal transitions from active to inactive. When the circuit device shifts from the second mode to the first mode, the reset circuit causes the reset signal to transition from active to inactive.