Data Communication Port Overvoltage Reset Clamping Circuit
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Solution Overview
Problem
The design of electronic devices with a single physical connection for both power transmission and data communication poses a risk of damage due to high voltage being inadvertently received at the communication port when the switch transitions from power transmission to data communication mode before the power source stops, as existing solutions for port protection are either costly, time-consuming, or add significant size and power loss to the device.
Innovation Solution
A power clamping solution using an overvoltage protection switch connected between the communication lines and the reset line of the switch controller, which activates the reset function to disconnect the communication port from the external interface when an overvoltage condition is detected, preventing damage by setting the IC to a high impedance mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single physical connection is used for both power transmission and data communication, then device complexity and production cost are reduced, but the risk of overvoltage damage to the communication port increases
Solution Approach 1:
An overvoltage protection switch is introduced as an intermediary component between the single physical connection and the communication port. This switch acts as a mediator that allows normal operation when voltage is within safe limits but automatically disconnects the communication port when overvoltage is detected, thus protecting against damage while maintaining the simplicity of the single physical connection design
2Object-affected harmful factors
If port protection functionality is added to the IC, then communication port safety is improved, but manufacturing time and implementation cost increase significantly
Solution Approach 1:
The protection functionality is segmented from the main IC chip design. Instead of integrating port protection directly into the IC (which would require lengthy design and implementation cycles), the protection function is separated into a discrete overvoltage protection switch that can be added to the circuit board level, significantly reducing development time while maintaining protection effectiveness
3Object-affected harmful factors
If a buffer IC is added between the switch and main IC, then communication port protection is achieved, but device size and production cost increase
Solution Approach 1:
Instead of using a bulky buffer IC, the solution employs a compact overvoltage protection switch that is smaller and more cost-effective. This switch provides the necessary protection functionality with minimal space requirements, avoiding the significant size and cost increase that would result from adding a buffer IC to the design
Data Source
AI summary
A circuit for controlling an interface between an integrated circuit of an electronic device and an external device includes each of an interface control switch and an overvoltage protection switch. The interface control switch includes a controller for controlling a mode of the interface between a data communication mode that connects the external device to the integrated circuit of the electronic device via one or more communication lines of the electronic device, and a power transmission mode that connects a power source of the external device to a battery of the electronic device. The controller includes a reset line for resetting the interface control switch. The overvoltage protection switch is connected between the one or more communication ports and the reset line, and is configured to activate the reset line of the controller in response to an overvoltage condition at the one or more communication lines of the electronic device.