Respirator serial interface extension device

Abstract

The invention discloses a respirator serial interface extension device and belongs to the technical field of respirators. The respirator serial interface extension device comprises a plurality of single-chip microcomputer peripheral data terminal sets, a switch selector unit, and a single-chip microcomputer data terminal. The single-chip microcomputer peripheral data terminal sets are connected with single-chip microcomputer peripheries of a breather and are used for receiving data from the single-chip microcomputer peripheries or transmitting data to the single-chip microcomputer peripheries. The switch selector unit comprises a plurality of control input ends connected with idle serial interface lines of a single-chip microcomputer in the respirator. The single-chip microcomputer sets the control input ends in different binary combined states and is used for gating one of the single-chip microcomputer peripheral data terminal sets to be in data communication with the single-chip microcomputer data terminal. The single-chip microcomputer data terminal is connected with serial interfaces of the single-chip microcomputer in the respirator and is used for transmitting data to the single-chip microcomputer or receiving data from the single-chip microcomputer. The respirator serial interface extension device has the advantages that the problem that the serial interfaces of the single-chip microcomputer in the respirator are few is solved, the device is simple and hardware cost is low.

Description

technical field [0001] The invention relates to the technical field of ventilators, in particular to a ventilator serial interface expansion device. Background technique [0002] There are often multiple single-chip peripheral devices in the existing ventilator, which need to communicate with the single-chip microcomputer of the ventilator through the serial interface of the single-chip microcomputer in the ventilator. For example, the oxygen flow sensor and the air flow sensor need to be connected to the serial interface of the single-chip microcomputer in the ventilator, which is used to read the internal calibration data of the sensor when the user system is powered on. Other single-chip peripherals also need to pass through the single-chip microcomputer in the ventilator. Serial interface for data transmission. However, there are generally only two serial interfaces in the current mainstream single-chip microcomputer. When there are many sensors, if the serial interface...

AI Technical Summary

Problems solved by technology

The dedicated expansion chip SP2327 / 8DP is a multi-serial port expansion chip designed with low-power CMOS technology, which can realize the expansion of a high baud rate MCU serial interface to three low baud rate serial interfaces, it is mainly for Solve the problem that most of the 8-bit and 16-bit microcontrollers have too few serial interfaces, and most of them have only one, which is specially designed, but the cost is relatively high

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