Component: DAC Dual (MCP49x2) (Analog Output)
| Author | Matrix TSL |
| Version | 1.0 (Release) |
| Category | Analog Output |
Contents
DAC Dual (MCP49x2) component
Component to drive a dual digital to analogue converter (DAC) IC from Microchip via an SPI interface. Compatible with MCP4902 (8-Bit), MCP4912 (10-Bit) and MCP4922 (12-Bit) devices.
Examples
No additional examples
Downloadable macro reference
SetOutput
Sets the output voltage of the DAC
8-Bit: Range 0-255
10-Bit: Range 0-1023
12-Bit: Range 0-4095
Parameters
- BYTE Channel
- 0=DAC Channel 0 , 1=DAC Channel 1
- UINT DAC_Value
- The value to output to the DAC
Return value
- This call does not return a value
ControlPins
Allows Shutdown (SHDN) and Latch (LDAC) pins to be controlled directly if enabled.
Parameters
- BOOL Shutdown
- 0 = Shutdown Device, 1 = Device Active
- BOOL Latch
- 0 = Data output driven from DAC register, 1 = Data output locked
Return value
- This call does not return a value
Disable
Disables the DAC output.
Parameters
- BYTE Channel
- 0=DAC Channel 0 , 1=DAC Channel 1
Return value
- This call does not return a value
Enable
Enables the DAC Output.
Parameters
- BYTE Channel
- 0=DAC Channel 0 , 1=DAC Channel 1
Return value
- This call does not return a value
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.
Parameters
- This macro has no parameters
Return value
- This call does not return a value
Simulation macro reference
This component does not contain any simulation macros
Property reference
DAC IC
This property is of type Fixed list of ints and can be referenced with the variable name DAC_IC.
Selects which DAC IC is connected and therefore the bit depth available.
Gain Option
This property is of type Fixed list of ints and can be referenced with the variable name GainOP.
Selects the maximum reference value for the DAC
Vref Voltage
This property is of type Floating point and can be referenced with the variable name VrefVol.
Reference Voltage, Used to calculate the Voltage resolution.
Steps
This property is of type Unsigned integer and can be referenced with the variable name Steps.
Number of discrete output states available from the DAC.
Control Bits
This property is of type Signed integer and can be referenced with the variable name BITS.
Number of digital control bits
Resolution
This property is of type Line of text and can be referenced with the variable name Res.
Maximum output resolution based on number of control bits.
Voltage Resolution
This property is of type Floating point and can be referenced with the variable name VoltRes.
Specifies the Resolution per digital bit in terms of Voltage.
Channel
This property is of type Fixed list of ints and can be referenced with the variable name cal_spi1::CHANNEL.
SPI Channel selector
Prescale
This property is of type Fixed list of ints and can be referenced with the variable name cal_spi1::PR_SCALE.
Prescale option selector
MOSI
This property is of type Single digital pin and can be referenced with the variable name cal_spi1::MOSI.
SPI Data Out Pin SDO - Also Known as Master Out Slave In (MOSI) when used in Master mode.
MISO
This property is of type Single digital pin and can be referenced with the variable name cal_spi1::MISO.
SPI Data In Pin SDI - Also Known as Master In Slave Out (MISO) when used in Master mode.
CLK
This property is of type Single digital pin and can be referenced with the variable name cal_spi1::CLK.
SPI Clock Pin CLK - The Clock signal is driven by the SPI master.
CS / SS
This property is of type Single digital pin and can be referenced with the variable name cal_spi1::SS.
Chip Select / Slave Select Pin
Master Mode: General purpose output pin used to select the remote SPI device.
Slave Mode: Hardware chip select pin input used to select the SPI device.
Use SHDN Pin
This property is of type True or false and can be referenced with the variable name UseSHDN.
Allows the SHDN pin to be driven from an output pin on the microcontroller.
If not used then tie the SHDN pin to VCC to allow the DAC to function.
Use LDAC Pin
This property is of type True or false and can be referenced with the variable name UseLDAC.
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.
DAC Output Scope Traces
This property is of type True or false and can be referenced with the variable name ScopeTraces.
Selects if the scope traces are automatically generated or not
SPI Scope Traces
This property is of type True or false and can be referenced with the variable name cal_spi1::ScopeTraces.
Selects if the scope traces are automatically generated or not
SPI Console Data
This property is of type True or false and can be referenced with the variable name cal_spi1::ConsoleData.
Selects if the console data is automatically generated or not
Injector
This property is of type Fixed list of ints and can be referenced with the variable name cal_spi1::Injector.
No additional information
