Pin-Selectable Digital Interface With Integrated Logic Level Shifting
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Solution Overview
Problem
Integrated circuits with analog and digital circuitry face challenges in efficiently communicating across different logic levels and modes of operation, often requiring additional level-shift circuitry and complex pin configurations to interface with microcontrollers or other digital control circuitry.
Innovation Solution
The integrated circuit employs a pin-selectable mode of operation and level-shift functionality, using a rectifier and mode detection circuit to determine the mode of operation based on input voltages, allowing the same pins to define digital logic levels and select the mode, reducing pin count and eliminating the need for additional level-shift circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate level-shift circuitry is used to translate logic levels between analog and digital domains, then reliable communication across different logic levels is achieved, but device complexity and pin count increase
Solution Approach 1:
The patent combines the level-shift functionality with the existing digital interface circuit pins, allowing the same pins to both select operating modes and perform level-shifting operations. This integration eliminates the need for separate level-shift circuitry while maintaining reliable communication across different logic levels between analog and digital domains
Solution Approach 2:
The digital interface pins are designed to serve multiple functions: they can define digital logic levels, select operating modes (such as SPI or parallel modes), and perform level-shifting operations. This multi-functionality reduces the overall pin count and device complexity while ensuring reliable communication across different logic domains
2Adaptability or versatility
If additional level-shift circuitry is added to interface with microcontrollers, then logic level translation is achieved, but pin count and device complexity increase
Solution Approach 1:
The patent designs the digital interface pins to universally handle multiple tasks including mode selection, logic level definition, and level-shifting operations. This allows the integrated circuit to interface with different microcontrollers and digital control circuitry using the same pins, enhancing adaptability without increasing pin count
Solution Approach 2:
The level-shift functionality is merged into the existing digital interface circuit, allowing the same physical pins to handle both mode selection and level translation. This integration maintains interface compatibility with various microcontrollers while minimizing the quantity of pins required
3Ease of operation
If multiple pins are used to define digital logic levels and select modes, then precise control is achieved, but pin count increases
Solution Approach 1:
The patent enables the digital interface pins to universally perform both mode selection and logic level definition functions. By configuring the same pins to define digital logic levels based on their voltage states, the circuit achieves precise mode selection capability without requiring additional dedicated pins for each function
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
This solution enables independent definition of digital logic levels from analog supplies, allows switching between modes of operation using the same pins, and reduces pin count, enhancing interoperability with microcontrollers and other digital control circuitry without additional level-shift circuitry.
Implementation Method 1
a rectifier and mode detection circuit to determine the mode of operation based on input voltages
Data Source
AI summary
An apparatus includes a digital interface circuit configured to provide a digital interface. The digital interface is configurable based on a mode of operation of the digital interface circuit. The apparatus also includes input and output level-shift circuits. The input level-shift circuit is configured to shift a voltage level of an input signal for the digital interface circuit. The output level-shift circuit is configured to shift a voltage level of an output signal from the digital interface circuit. The input level-shifting and the output level-shifting are based on first and second level-shift input voltages. The apparatus further includes a mode detector configured to identify at least two modes of operation for the digital interface circuit based on the first and second level-shift input voltages. For example, the digital interface circuit could be configured to function as a serial or parallel interface depending on which level-shift input voltage is greater.