USB Type-C Connection Control Circuit With Low-Power CC Detection
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Solution Overview
Problem
The existing USB Type-C connection control circuits consume excessive power in the unconnected state due to the continuous operation of comparators for detecting voltage levels at the CC terminals, leading to high power consumption.
Innovation Solution
A connection control circuit is designed with a receiver circuit and a voltage change detection circuit that monitors voltage changes at the CC terminals, allowing the operation mode detection circuit to be powered down when unconnected and powered up only when a connection is detected, reducing power consumption by using a low-power receiver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operation mode detection circuit operates continuously to detect voltage levels at CC terminals, then connection detection reliability is improved, but power consumption increases
Solution Approach 1:
The receiver circuit performs preliminary voltage level detection continuously at low power, and only when a voltage change indicating connection is detected does the operation mode detection circuit activate to perform detailed operation mode detection. This preliminary action approach ensures connection detection reliability while minimizing power consumption during unconnected states.
Solution Approach 2:
The system transitions from continuous operation of the high-power operation mode detection circuit to periodic activation triggered by voltage change detection. The receiver circuit monitors continuously at low power, and the operation mode detection circuit operates periodically only when connection is detected, resolving the contradiction between continuous detection reliability and power consumption.
2Use of energy by moving object
If the operation mode detection circuit is stopped to reduce power consumption, then power consumption is reduced, but connection detection speed decreases
Solution Approach 1:
The receiver circuit performs preliminary voltage level detection continuously before the operation mode detection circuit activates. This preliminary action ensures that when connection occurs, the system is already aware of the voltage change and can immediately activate the operation mode detection circuit, maintaining fast connection detection speed while reducing overall power consumption.
Solution Approach 2:
The receiver circuit acts as an intermediary between the unconnected state and the operation mode detection circuit. It continuously monitors voltage levels at low power and triggers the operation mode detection circuit only when connection is detected, thus maintaining detection speed while reducing power consumption of the high-power circuit.
3Measurement precision
If the receiver circuit operates continuously to monitor voltage changes, then connection detection accuracy is improved, but power consumption increases
Solution Approach 1:
The detection function is segmented into two parts: the receiver circuit that continuously monitors voltage levels at low power for connection detection, and the operation mode detection circuit that performs detailed operation mode detection only when connection is detected. This segmentation maintains connection detection accuracy while minimizing overall power consumption.
Solution Approach 2:
The system uses periodic activation of the operation mode detection circuit triggered by voltage change detection from the continuously operating receiver circuit. This periodic action maintains accurate connection detection through continuous monitoring by the receiver circuit while reducing power consumption by activating the higher-power operation mode detection circuit only when necessary.
Data Source
AI summary
A connection control circuit according to an embodiment includes an operation mode detection circuit having an operation state control circuit. In a first state in which an other device is not connected to a first device, the operation state control circuit sets the receiver circuit to an operating state and the operation mode detection circuit to a stopped state. In addition, in a second state in which the other device is connected to the first device, the operation state control circuit sets the receiver circuit to a stopped state and the operation mode detection circuit to an operating state.