The model of the LED is identified by the type specifier LED.

Syntax:
.MODEL <model name> LED [model parameters]

Specify the simulation mode

The animated LED is a device in which the color changes when one of the following conditions occurs:

When the current through the diode equals or exceeds the values specified in the parameter ILOW.
When the voltage across its two terminals equals or exceeds the values specified in the parameter VLOW.
When a high logical state is applied to the anode and a low logical state is applied to the cathode.

The parameter SIMMODE specifies the model to be used.

SIMMODE=DIODE

The device is a light emitting diode whose color appears when the current through the diode equals or exceeds the values specified in the parameter ILOW. To model LED using diodes, you must specify a value for the following model parameters:

Parameter	Description
SIMMODE	Specify DIODE for this parameter.
DMODEL	Specify the SPICE model name of the diode or directly the parameters of the diode model (enclose the list of parameters in quotation marks). If the diode model is not specified, the default model is used.
ILOW, IBRIGHT, IBURNED	These parameters allow you to specify the current levels corresponding to the different LED states. These parameters are optional. If not specified, the default values are used. The LED is colorOFF if the level of current is less than ILOW. The LED is colorLOW if the level of current is less than IBRIGHT. The LED is colorBRIGHT if the level of current is less than IBURNED. The LED is colorBURNED if the level of current is higher IBURNED.

Parameter

Description

SIMMODE

Specify DIODE for this parameter.

DMODEL

Specify the SPICE model name of the diode or directly the parameters of the diode model (enclose the list of parameters in quotation marks). If the diode model is not specified, the default model is used.

ILOW, IBRIGHT, IBURNED

These parameters allow you to specify the current levels corresponding to the different LED states. These parameters are optional. If not specified, the default values are used.

The LED is colorOFF if the level of current is less than ILOW.
The LED is colorLOW if the level of current is less than IBRIGHT.
The LED is colorBRIGHT if the level of current is less than IBURNED.
The LED is colorBURNED if the level of current is higher IBURNED.

SIMMODE=RES

In certain cases may be convenient use a resistor to model the LED, in which case the color appears when the voltage across its two terminals equals or exceeds the values specified in the parameter VLOW. To model LED using resistors, you must specify a value for the following model parameters:

Parameter	Description
SIMMODE	Specify RES for this parameter.
RES	Resistance. Default = 1MΩ.
VLOW, VBRIGHT, VBURNED	These parameters allow you to specify the levels of voltage corresponding to the different LED states. These parameters are optional. If not specified, the default values are used. The LED is colorOFF if the voltage across its two terminals is less than VLOW. The LED is colorLOW if the voltage across its two terminals is less than VBRIGHT. The LED is colorBRIGHT if the voltage across its two terminals is less than VBURNED. The LED is colorBURNED if the voltage across its two terminals is higher VBURNED.

Parameter

Description

SIMMODE

Specify RES for this parameter.

RES

Resistance. Default = 1MΩ.

VLOW, VBRIGHT, VBURNED

These parameters allow you to specify the levels of voltage corresponding to the different LED states. These parameters are optional. If not specified, the default values are used.

The LED is colorOFF if the voltage across its two terminals is less than VLOW.
The LED is colorLOW if the voltage across its two terminals is less than VBRIGHT.
The LED is colorBRIGHT if the voltage across its two terminals is less than VBURNED.
The LED is colorBURNED if the voltage across its two terminals is higher VBURNED.

SIMMODE=DIGITAL

If the LED is connected directly to digital devices it may be convenient to simulate the LED in digital mode. To model the LED in digital mode, you must specify a value for the following parameters:

Parameter	Description	Default
SIMMODE	Specify DIGITAL for this parameter.
IN_MODE	Inputs mode.	IN
IOMODEL	The name of an I/O model, which describes the device’s loading and driving characteristics.	DGTDEFIOMODEL

When the LED is modeled in digital mode, the power supply nodes of the device can also be specified. Power nodes must be specified in the SPICE attributes of the component. Specify a value for the attributes: POWER_NODE and GROUND_NODE.

Specify the color

The following parameters allow you to specify the colors corresponding to the different LED states. These parameters are optional. If not specified, the default values are used.

Parameter	Description
COLOR	This parameter allows you to specify one of the predefined colors: RED, ORANGE, YELLOW, GREEN, BLUE, WHITE, LCD. Default = RED.
COLOROFF	This parameter allows you to specify the color of the LED in off state. Represent a 32-bit ARGB color.
COLORLOW	This parameter allows you to specify the color of the LED in low state. Represent a 32-bit ARGB color.
COLORBRIGHT	This parameter allows you to specify the color of the LED in bright state. Represent a 32-bit ARGB color.
COLORBURNED	This parameter allows you to specify the color of the LED in burned state. Represent a 32-bit ARGB color.
GRADIENT	This parameter indicates that the color change is gradual from one state to another. Values: ON or OFF. Default = ON.

Example

.model ledred led (simmode=diode dmodel="IS=93.2P RS=42M N=3.73 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 TT=4.32U" ilow=1m ibright=15m iburned=100m color=red)


LED Model