Pin Connection Type Detection Using Pulse Response Analysis
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Solution Overview
Problem
Existing chip configurations face challenges in detecting whether a pin is connected to a capacitor or an inductor, especially when there are no free pins available for strapping, and existing methods may result in false detections due to parasitic capacitance and inductance.
Innovation Solution
A pulse-based detection system that generates pulses based on voltage thresholds, uses a buffer to intensify the pulses, and a sampling circuit with a delay and logic gate to filter noise and determine the connection type, employing a flip-flop to retain the result, allowing differentiation between capacitive and inductive responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a strap pin is used to detect chip configuration, then the configuration detection is enabled, but all pins must be available and not occupied by other functions
Solution Approach 1:
The detection circuit uses existing functional pins (such as power supply pins or I/O pins) that are already occupied by other functions to perform configuration detection. The same pin serves both its original function and the detection function, eliminating the need for dedicated strap pins.
Solution Approach 2:
The chip uses its own existing pins and internal circuitry to perform self-detection of the configuration. The detection mechanism leverages the chip's own power supply network and signal paths without requiring external dedicated detection pins.
2Measurement precision
If traditional detection methods are used, then configuration detection is performed, but false detections occur due to parasitic capacitance and inductance
Solution Approach 1:
The detection circuit applies periodic test signals (such as oscillating signals or repeated pulse sequences) to the pin under test. By analyzing the periodic response and comparing it against expected patterns, the circuit can distinguish true configuration states from false readings caused by parasitic elements.
Solution Approach 2:
The detection mechanism incorporates feedback loops that monitor the response signals and adjust detection parameters dynamically. The system compares detected values against reference values and uses feedback to confirm detections, reducing false positives by requiring consistent responses across multiple measurement cycles.
3Measurement precision
If pulse intensity is increased to overcome noise, then signal detection is improved, but parasitic capacitance and inductance effects are amplified
Solution Approach 1:
The detection circuit varies multiple parameters of the test signal including frequency, duty cycle, and amplitude in a coordinated manner. By changing these parameters dynamically during the detection process, the system can optimize signal-to-noise ratio while keeping parasitic effects within acceptable ranges through adaptive parameter adjustment.
Solution Approach 2:
The detection system uses dynamic signal characteristics rather than static signals. The test signals have varying amplitude, frequency, or timing characteristics that allow the system to distinguish between genuine configuration responses and parasitic effects, which respond differently to dynamic stimulation.
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
Effectively distinguishes between capacitor and inductor connections, reducing false detections and overcoming limitations like parasitic capacitance and inductance, enabling accurate configuration detection even when pins are shared or scarce.
Implementation Method 1
a pulse generator configured for generating a first pulse
Implementation Method 2
The electrical circuit comprising a capacitor or an inductor
Implementation Method 3
the pin is connected to a coil inductor or another electrical module that reacts to electrical current differently than a capacitor
Data Source
AI summary
The subject matter discloses an apparatus configured for detecting type of a connection of an electrical module to an electrical node of an electrical circuit, the apparatus comprising a pulse generator configured for generating a first pulse; and a sampling circuit configured for applying a reaction of the electrical circuit on the first pulse to provide a sampled pulse and for detecting the type of connection from the sampled pulse. The electrical module comprising a capacitor or an inductor.