PMIC I2C Interface Tuning for Noise-Stable Power Conversion
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Solution Overview
Problem
Existing power management integrated circuits face issues with communication stability and efficiency due to voltage differences between internal and external circuits caused by noise, leading to false or missing signal triggers during I2C communication.
Innovation Solution
A power management integrated circuit with an I2C interface circuit and a driving circuit that adjusts supply voltage and driving speed to stabilize communication, using regulation signals to optimize the I2C interface's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving speed of the driving circuit is increased to improve the efficiency of the DC/DC converter, then the conversion efficiency is improved, but the communication stability of the I2C interface deteriorates due to voltage differences caused by noise
Solution Approach 1:
The patent implements adjustable driving speed for the driving circuit, allowing it to dynamically change operating conditions. The driving circuit can operate at higher speeds during non-communication periods to maximize efficiency, and reduce speed during I2C communication to minimize noise and maintain communication stability, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent changes the supply voltage parameter of the I2C interface circuit based on operating conditions. By adjusting the supply voltage to be higher during communication periods, the noise margin is increased, which maintains communication reliability even when the driving circuit operates at high speeds. This parameter adjustment resolves the contradiction by allowing high efficiency operation without sacrificing communication stability
2Reliability
If the supply voltage of the I2C interface circuit is increased to improve communication stability, then the communication accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic adjustment of the supply voltage to the I2C interface circuit. The voltage is increased only during periods when I2C communication is detected or expected, and reduced during non-communication periods. This periodic action maintains communication accuracy when needed while minimizing power consumption during idle periods, resolving the contradiction between reliability and energy use
Data Source
AI summary
The present application discloses a power management integrated circuit includes an I2C interface circuit and a driving circuit. The I2C interface circuit receives regulation parameters from the host controller. The driving circuit converts a switching signal into a driving signal and applies the driving signal to a control terminal of a power switch in the power management integrated circuit, and that regulates power transmission from the input terminal to an output terminal of the power management integrated circuit by controlling on and off states of the power switch to provide a stable output voltage, the switching signal being obtained according to the regulation parameters. The power management integrated circuit has improved communication accuracy by adjusting a driving speed of the driving circuit and/or a supply voltage of the I2C interface circuit when communication of the I2C interface is interfered.