NI Multisim NI Multisim (formerly MultiSIM ) is an electronic schematic capture and simulation program which is part of a suite of circuit design programs, along with NI Ultiboard. Multisim is one of the few circuit design programs to employ the original Berkeley SPICE based software simulation. Multisim was originally created by a company named Electronics Workbench, which is now a division of National Instruments. Multisim includes microcontroller simulation (formerly known as MultiMCU), as well as integrated import and export features to the Printed Circuit Board layout software in the suite, NI Ultiboard. Multisim is widely used in academia and industry for circuits education, electronic schematic design and SPICE simulation. History Multisim was originally called Electronics Workbench and created by a company called Interactive Image Technologies. At the time it was mainl...
Multisim and MPLAB Co-simulation for Microcontrollers Development [Beta]
Table of Contents
- Analog-to-Digital Converter (ADC)
- Graphical Display
- Boost Converter (Switching Power Supply)
- Studentscan learn advanced concepts of real-world applications such as Pulse Width Modulation and LCD displays
- Professors can combine the teaching of analog electronics, digital circuits, and embedded systems topics in a single software environment
- Designers can accurately develop a wide range of applications with an accelerated time-to-market of their new product ideas.
Introduction
Multisim comes with a new plug-in to co-simulate with Microchip’s MPLAB for simulation of complete circuits including PIC Microcontrollers (MCUs). With a best-in-class SPICE simulation of analog components, a database of over 4,000 MCUs, and an interactive graphical environment:
Applications of the MCU Co-simulation in Multisim
Microcontrollers are widely used in embedded systems applications. When combined with a analog electronics from leading semiconductor manufacturers, engineers get a rich field for innovation of complete systems.
The Multisim co-simulation with MPLAB plug-in comes with a set of sample circuits that are essential in many embedded systems, mechatronics, and analod/digital-mixed applications. Some of those samples are highlighted below.
1. Analog-to-Digital Converter (ADC)
This example demonstrates the basic functionality of implemented using a PIC18F8722 microcontroller. It also uses one of the output ports to display a text message on a graphical display.
The simulation results shown on the oscilloscope are compared with the results from a discrete ADC component in Multisim.
2. Graphical Display
This example uses a simple LCD to display a message programmed on a PIC32MX250. As you can see on the right side of the simulation, the simulation plug-in displays the compiled code. You can step in, step over, pause, and run the code. You can also insert breakpoints to easily debug the code.
3. Boost Converter (Switching Power Supply)
This example is control application where a PIC18F8722 is used to generate a Pulse Width Modulation (PWM) signal to control a Switched Mode Power Supply (SMPS) in a Boost configuration.
The simulation run is a transient analysis to evaluate the output voltage build-up, the load current ripples, and the digital control signal.
With a similar setup, you can learn about many other power electronics SMPS topologies with accurate modeling of both the digital control side and the analog plant electronics side. You can accurately evaluate the behavior of DC-DC converter, AC-DC rectifiers, and DC-AC power inverters.
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