Woodward 5501-467 Simplex Discrete I/o Module

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FROM：Mr. Wei

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Discrete I/o module

Different types of chips are now needed to handle different types of power applications. Let's see how this is done. First let's look at what discrete I/o modules are. In order to control and manage the power system and I/o chip, a complete modular architecture must be adopted. This includes an I/o module - the MCU performs various functions with different hardware. The following is a typical device classification. I/o module refers to the subsystem on the chip (can also be understood as a device) between the communication transmission information and control functions to achieve. This is usually the case: the control chip converts the input signal into the output signal through the I/o control module.

1. Data transmission

As can be seen from the figure, the data information transmitted by the I/o module mainly includes frequency, voltage, current and frequency. In general, frequency refers to the ratio or proportional relationship between voltage, current and frequency between inductors. The magnitude of the voltage can be described by the waveform; The higher the frequency, the higher the conversion efficiency. The current frequency can be 1024/105 Hz or higher. The higher the frequency, the greater the transmission loss over the entire voltage range, and the weaker the ability to convert into a signal. As can be seen from the figure, the voltage variation between the current frequency of 500 Hz and 3 GHz is very large. Therefore, the frequency signal strength in the output power range is very high, so it must have good high-frequency characteristics to ensure the stability and reliability of the I/o function.

2. Output signal

By converting input signals into output signals, the control chip can control these devices to perform functions. I/o modules usually have an analog input and output. One of them is an analog input signal interface (ADC). The other I/o interface can be controlled by sampling in the input signal. This functionality can be implemented through an external ADC or other hardware. One typical application is in the automotive industry, where a standard ADC is used to convert an input signal into an analog signal; Another typical application is an ammeter.

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3. Control signals

For most applications, the signal is sent from the MCU and then converted into a digital signal by an external I/o circuit. There are many ways to simulate the input signal. For example, input voltage signal, resistance signal and inductance signal. If the input signal is a DC input signal, MCU needs to be controlled or provided with external signals. The input signal is controlled by external I/O interface or serial port. For example, if the input signal is an AC signal, the internal I/o circuit needs to be used to achieve AC conversion. When passing through the pulse signal, the analog output signal needs to be converted before it can be displayed. Then the output control. A signal from an interface or an I/o output passes through a control circuit and is returned directly to the MCU.

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