USB CC Control Circuit Using One Pin for Dual Impedance Tuning
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Solution Overview
Problem
Conventional USB Type-C control circuits require separate pins to control CC1 and CC2 pins, leading to increased circuit area and cost, and fail to meet input resistance specifications when using a single pin for both.
Innovation Solution
A USB control circuit design that uses a single pin to control both CC1 and CC2 pins, incorporating transistors, resistor groups, and Schottky diodes to adjust input impedance and meet USB Type-C specifications, while maintaining a small circuit area and low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two pins are used to control CC1 and CC2 pins respectively, then the input resistance of CC1 and CC2 pins can conform to USB type-C specifications, but the circuit area and cost of the control chip increase
Solution Approach 1:
The patent combines the control functions of CC1 and CC2 pins into a single control pin. The control circuit uses one control pin to simultaneously manage both channel configuration pins through a shared control mechanism, reducing the number of control pins from two to one while maintaining proper input resistance characteristics for both channels.
Solution Approach 2:
The single control pin is designed to perform multiple functions by controlling both CC1 and CC2 pins. The control circuit enables this pin to independently adjust the input resistance of each channel configuration pin, allowing one pin to serve the dual purpose previously requiring two separate pins.
2Area of stationary object
If a single pin is used to control both CC1 and CC2 pins, then the circuit area and cost are reduced, but the input resistance of CC1 or CC2 pin may fail to conform to USB type-C specifications
Solution Approach 1:
The control circuit segments the control function into independent control paths for CC1 and CC2 pins while sharing a common control pin. Each channel has its own control transistor and resistor group, allowing independent adjustment of input resistance for each pin despite being controlled by a single pin.
Solution Approach 2:
The circuit implements local quality control by providing separate resistor groups for each channel configuration pin. This allows the input resistance of CC1 and CC2 pins to be independently adjusted to meet USB type-C specifications, even though they share a common control pin.
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
The solution allows for separate adjustment of input impedance of CC1 and CC2 pins, reducing circuit area and cost while conforming to USB Type-C specifications, ensuring effective power management between USB devices.
Implementation Method 1
a first Schottky diode and a second Schottky diode
Implementation Method 2
a first transistor having a first control terminal; a second transistor having a second control terminal
Implementation Method 3
a first resistor group coupled between the first channel configuration pin and the first transistor; a second resistor group coupled between the second channel configuration pin and the second transistor
Data Source
AI summary
The invention discloses a control circuit applied to a Universal Serial Bus (USB) which includes a first channel configuration pin and a second channel configuration pin. The control circuit includes: a first transistor having a first control terminal; a first resistor group coupled to the first channel configuration pin and the first transistor; a first Schottky diode having a first end and a second end, the first end being coupled to the first control terminal; a second transistor having a second control terminal; a second resistor group coupled to the second channel configuration pin and the second transistor; and a second Schottky diode having a third end and a fourth end, the third end being coupled to the second control terminal, and the fourth end being coupled to the second end of the first Schottky diode.