Two-Pin Serial Data Transmission Circuit for Compact Devices
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Solution Overview
Problem
Conventional data transmission methods, such as parallel and USB-based serial transmission, require additional circuit space and pins, increasing costs and complexity, especially in compact devices like PDAs and smartphones, due to the need for encoding/decoding circuits and multiple transmission pins.
Innovation Solution
A data transmission method using only two pins to transmit a clock signal and a data signal simultaneously, where the clock signal is used to synchronize data transmission, allowing for flexible software protocol control and eliminating the need for additional encoding/decoding circuits, thereby reducing circuit space and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel transmission is used, then data transmission capability is improved, but the number of transmission pins and circuit space increase
Solution Approach 1:
The patent combines multiple data transmission functions into a single serial transmission channel. Instead of using multiple parallel transmission pins, the invention uses one serial pin to transmit all data bits sequentially, thereby reducing the number of transmission pins while maintaining data transmission capability.
Solution Approach 2:
The single transmission pin serves multiple functions: transmitting data bits sequentially, carrying address information, and enabling bidirectional communication. This multi-functional use of a single pin reduces the overall number of required transmission pins.
2Productivity
If USB serial transmission is used, then data transmission is achieved, but additional encoding/decoding circuits are required
Solution Approach 1:
The patent extracts and eliminates the complex USB encoding/decoding circuitry by implementing a simplified custom serial transmission protocol. The invention removes the unnecessary USB protocol layer and uses direct binary data transmission with simple start/stop bit framing, thereby reducing circuit complexity while maintaining data transmission functionality.
3Reliability
If additional circuit space is allocated for encoding/decoding circuits, then data transmission reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive, complex encoding/decoding circuits with simple, inexpensive transmission logic. The invention uses basic shift registers and serial-to-parallel conversion circuits that are much cheaper to manufacture while providing sufficient reliability for the application.
4Speed
If more transmission pins are used, then data transmission speed is improved, but device size and cost increase
Solution Approach 1:
The patent uses periodic clock signals to drive serial data transmission at high speeds. By using a high-frequency clock signal and transmitting multiple bits sequentially in rapid succession, the invention achieves high data transmission rates through a single pin, eliminating the need for multiple pins to increase speed.
Data Source
AI summary
A data transmission method and the transmission circuit thereof for transmitting data between a host and a peripheral apparatus are disclosed. The data transmission method includes the following steps. First, a clock signal is transmitted by a first pin. Then, a data signal is transmitted by a second pin according to the timing of the clock signal.