# Diode

Generic diode component models the standard axial diode with parametric spacing.  

## Breadboard Footprint

![](Breadboard.png) 

## Schematic Symbol

Not available
> Roadmap: Bind schematic.

## Description

A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other.  [Learn More..](https://en.wikipedia.org/wiki/Diode)



## SPICE

Supports a standard 0.7v voltage-drop. 
> Roadmap: support parametric voltage-drop.

## OpenVBB

Diodes are modelled as switched pull-up or switched pull-down resistor. The *Function* property is used to select the *behaviour to model*.    

## Properties

| Property | Description |
| :---            | :--- |
| [Function](#function) | OpenVBB behaviour mode markup : Vdd \| GND \|   |

### Function

OpenVBB behaviour mode markup.

#### VDD

In VDD mode the diode acts as a pullup resistor when connected to VDD.

#### GND

In GND mode the diode acts as a pulldown resistor when connected to ground. 

#### Document
 
In Document mdoe the diode doesn't participate in the circuit.

## Useage

### OpenVBB
 
![](Diodes.gif)

* In GND mode the diode acts as a pulldown resistor when connected to ground. 
* In VDD mode the diode acts as a pullup resistor when connected to VDD.

![](DocumentDiode.gif)

A common example is a protection diode you often see in circuits accross solonoid and motors. The protection diodes can be placed using document mode so they appear in the circuit but dont participate in the emulation in OpenVBB evaluation.

### SPICE

**Wired And**

![](WiredAnd.gif)

**Wired Or**

![](WiredOr.gif)