Storage Device Reset Circuit for Stable Power-On-Reset
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Solution Overview
Problem
Data storage devices without a reset pin face reliability issues during Power-On-Reset (POR) operations due to insufficient power voltage drops, affecting the stability and reliability of reset operations.
Innovation Solution
A reset circuit is introduced, comprising a voltage detector and a compulsory discharge circuit, which detects the rising edge of the external voltage and discharges the enable terminal or power terminal of the memory device, ensuring a stable POR by generating a control signal pulse and using a switching device to provide a ground, with current limiting devices to manage discharge current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Power-On-Reset (POR) is performed by power cut-off and supply in memory devices without a reset pin, then the reset operation can be initiated, but the power voltage may not be sufficiently dropped to achieve reliable reset
Solution Approach 1:
A reset circuit is introduced as an intermediary component between the power supply and memory device. This reset circuit includes a voltage detector that monitors power voltage and a discharge circuit that actively discharges capacitors when reset conditions are met, mediating the power transition to ensure reliable reset without requiring complex external power control
2Reliability
If the external voltage does not sufficiently decrease during POR, then the power supply appears stable, but the reset operation cannot be properly executed
Solution Approach 1:
The reset circuit operates autonomously by self-detecting the power voltage level through its voltage detector and automatically activating the discharge circuit when reset conditions are satisfied. This self-service mechanism eliminates the need for external controllers to monitor and manage the power discharge process, simplifying the overall power control requirements
3Ease of operation
If a reset pin is added to the memory device, then direct reset control is possible, but the device package complexity increases
Solution Approach 1:
The reset circuit utilizes existing power supply pins and internal voltage detection capabilities to perform reset functions. By making the power supply system multi-functional (providing both power and reset control), the need for additional dedicated reset pins is eliminated, maintaining a compact device package
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability of the reset operation in data storage devices by ensuring a stable power voltage drop during POR, even when the external voltage does not sufficiently decrease, thereby improving the reliability of memory device resets.
Implementation Method 1
a voltage detector to generate a control signal pulse according to a change of the external voltage
Implementation Method 2
a compulsory discharge circuit to discharge the enable terminal or the power terminal in response to the control signal pulse. The compulsory discharge circuit may include a switching device to provide a ground to the enable terminal or the power terminal
Implementation Method 3
a current limiting device connected to between the switching device and a ground to limit a size of a discharge current
Data Source
AI summary
A data storage device including a reset circuit and a method of resetting thereof includes a memory device to receive a driving voltage through a power terminal thereof, a voltage regulator to adjust an external voltage to provide the adjusted voltage to the power terminal of the memory device, and a reset circuit to discharge an enable terminal of the voltage regulator or the power terminal of the memory device according to a change of the external voltage.