Integrated Circuit Power Supply Mode Switching
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Solution Overview
Problem
Integrated circuits that control power supply circuits require a dedicated terminal for writing data, increasing the number of pins and complicating operations such as trimming and testing.
Innovation Solution
An integrated circuit with a switching circuit that adjusts operation modes based on voltage levels, including a memory control circuit to write setting information into a storage circuit, allowing for operation adjustments without a dedicated terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dedicated terminal is used for writing data into memory, then data writing capability is achieved, but the number of pins increases
Solution Approach 1:
The power supply voltage terminal (VCC) is designed to serve multiple functions: it provides power supply voltage during normal operation, and also serves as a data input terminal during memory writing operations. By detecting the voltage level at this terminal, the circuit determines whether to perform normal power supply function or data writing function, eliminating the need for a dedicated data terminal.
2Ease of manufacture
If a dedicated terminal is used for testing, then testing capability is achieved, but the number of pins increases
Solution Approach 1:
The power supply voltage terminal (VCC) is designed to serve multiple functions: it provides power supply voltage during normal operation, and also serves as a data input terminal during memory writing operations. By detecting the voltage level at this terminal, the circuit determines whether to perform normal power supply function or data writing function, eliminating the need for a dedicated data terminal.
3Adaptability or versatility
If voltage level detection is used to switch operation modes, then operation adjustment capability is achieved, but circuit complexity increases
Solution Approach 1:
The circuit automatically detects the voltage level at the VCC terminal and self-determines its operation mode without requiring external control signals or complex control logic. When voltage exceeds a threshold, it automatically switches to memory writing mode; otherwise, it operates in normal power supply mode,实现ing self-service operation mode switching.
Data Source
AI summary
An integrated circuit for a power supply circuit that generates an output voltage from an input voltage and includes an inductor and a transistor, the integrated circuit configured to switch the transistor to control a current of the inductor. The integrated circuit includes a first terminal that receives a power supply voltage, a second terminal that receives a voltage corresponding to an operation state of the integrated circuit, a storage circuit, a switching circuit that switches an operation mode of the integrated circuit based on voltage levels at the first and second terminals, the operation mode including a write mode, a test mode and a normal mode, a memory control circuit that writes setting information into the storage circuit, when the integrated circuit operates in the write mode, and a setting target circuit that operates based on the setting information stored in the storage circuit, when the integrated circuit operates in the test mode.