Component: DAC Quad (MCP4728) (MCP4728) (Analog Output): Difference between revisions

Latest revision as of 14:37, 13 July 2026

Component to drive a quad digital to analogue converter (DAC) IC from Microchip via an I2C interface. Compatible with MCP4728 (12-Bit) devices.

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	ControlPins
Allows Shutdown (SHDN) and Latch (LDAC) pins to be controlled directly if enabled.
- BOOL	Latch
0 = Data output driven from DAC register, 1 = Data output locked
- VOID	Return

	Disable
Disables the DAC output.
- BYTE	Channel
Range: 0-3 / 0=DAC Channel 0 / 1=DAC Channel 1 ...
- VOID	Return

	Enable
Enables the DAC Output.
- BYTE	Channel
Range: 0-3 / 0=DAC Channel 0 / 1=DAC Channel 1 ...
- VOID	Return

	Initialise
Configures the SPI peripheral ready for communications and initialises the internal variables. DAC needs to be enabled before any output voltage can be generated.
- VOID	Return

	SetDeviceAddress
Writes a new device address into EE memory. The use LDAC pin component property must be set to true and the LDAC pin should be unique for every MCP4728 device connected to the I2C bus.
- BYTE	OldAddress
Range: 0-7
- BYTE	NewAddress
Range: 0-7
- VOID	Return

	SetInitialEEOutput
Stores a DAC value into EE memory to be used on power up.
- BYTE	Channel
Range: 0-3 / 0=DAC Channel 0 / 1=DAC Channel 1 ...
- UINT	DAC_Value
The value to output to the DAC
- VOID	Return

	SetOutput
Sets the output voltage of the DAC 12-Bit: Range 0-4095
- BYTE	Channel
Range: 0-3 / 0=DAC Channel 0 / 1=DAC Channel 1 ...
- UINT	DAC_Value
The value to output to the DAC
- VOID	Return

	Properties
	Pull Down Option

	VREF Option

	Gain Option
Selects the maximum reference value for the DAC
	Vref Voltage
Reference Voltage, Used to calculate the Voltage resolution.
	Steps
Number of discrete output states available from the DAC.
	Control Bits
Number of digital control bits
	Resolution
Maximum output resolution based on number of control bits.
	Voltage Resolution
Specifies the Resolution per digital bit in terms of Voltage.
	I2C Connections
	Device Address

	Channel
Channel selection
	SDA
Pin used for SDA (data signal)
	SCL
Pin used for SCL (clock signal)
	Baud Select
Baud rate option selector
	Baud Rate
Baud rate to be used
	Stop Delay
On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications.
	Use LDAC Pin
Allows the LDAC pin to be driven from an output pin on the microcontroller. If not used then tie the LDAC pin to GND to allow the DAC to function.
	Simulation
	Simulation Comms

Please click here to download the component source project: FC_Comp_Source_DAC_MCP4728.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_DAC_MCP4728.fcfx

@@ Line 272: / Line 272: @@
 | colspan="2" | Specifies the Resolution per digital bit in terms of Voltage.&nbsp;
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-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | I2C Connections
 |-
@@ Line 316: / Line 316: @@
 | colspan="2" | Allows the LDAC pin to be driven from an output pin on the microcontroller. If not used then tie the LDAC pin to GND to allow the DAC to function.&nbsp;
 |-
-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | Simulation
 |-