Single-Pin Control Circuit for Dynamic Mode and Clock Detection
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Solution Overview
Problem
Existing electronic devices with limited pins face challenges in dynamically transitioning between different modes of operation, especially when synchronization with an external clock is required, as static selection methods do not provide sufficient flexibility for on-the-fly mode changes.
Innovation Solution
A circuit and method utilizing a single pin to dynamically manage two different modes of operation, including external synchronization, by evaluating signal levels and employing a finite state machine to handle mode transitions and clock detection, allowing for dynamic mode switching without additional pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single pin is used for both mode selection and external clock input, then pin count is reduced and flexibility is improved, but the ability to distinguish between mode selection signal and clock signal becomes difficult
Solution Approach 1:
The patent applies periodic action by detecting the frequency characteristics of the signal on the single pin. When the signal exhibits periodic transitions within a specific frequency range (first frequency range), the system identifies it as a clock signal. When transitions are slower (second frequency range), it identifies it as a mode selection signal. This frequency-based differentiation resolves the ambiguity of using a single pin for both purposes.
Solution Approach 2:
The patent changes the parameter used for signal identification from static voltage level to dynamic frequency characteristics. By monitoring the transition frequency of the signal over time, the system can distinguish between mode selection (low frequency) and clock synchronization (high frequency) functions on the same pin, eliminating the need for separate pins.
2Ease of operation
If static pin strapping is used for mode selection, then device startup configuration is simplified, but dynamic mode transitions on-the-fly are not supported
Solution Approach 1:
The patent transforms the static pin strapping mechanism into a dynamic one by continuously monitoring signal transitions on the pin after startup. Instead of fixing the mode at startup, the system detects subsequent signal transitions and dynamically switches modes based on detected edges, enabling on-the-fly mode changes while maintaining the same simple pin interface.
Solution Approach 2:
The system implements feedback by continuously monitoring the pin signal for transitions and using this information to dynamically adjust the operating mode. The mode selection is no longer a one-time startup event but an ongoing process where the system responds to signal transitions in real-time, enabling dynamic adaptation while keeping the interface simple.
3Ease of operation
If different part numbers are defined for each mode, then mode selection is simplified at startup, but the device cannot dynamically switch between modes and requires multiple device variants
Solution Approach 1:
The patent makes a single device variant universal by enabling it to perform multiple modes dynamically through software control via the standard programming interface. Instead of requiring different hardware variants for different modes, the same device can be programmed to operate in different modes at different times, reducing the need for multiple part numbers and simplifying inventory while maintaining ease of mode selection through software.
Data Source
AI summary
A circuit receives an input signal having a first level and a second level. A logic circuit includes a finite state machine circuit, an edge detector circuit, and a timer circuit. The finite state machine circuit is configured to set a mode of operation of the circuit. The edge detector circuit is configured to detect a transition between the first and second level. The timer circuit is configured to determine whether the first or second level is maintained over an interval, which starts from a transition detected by the edge detector circuit. The finite state machine circuit is configured to change the mode of operation based on the timer circuit determining that the first or second level has been maintained over the interval.