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The MCP44XX device range supports 4 digital potentiometers or rheostat outputs. 129 or 257 possible output resistance values for each channel.  
The MCP44XX device range supports 4 digital potentiometers or rheostat outputs. 129 or 257 possible output resistance values for each channel.  


==Component Pack==
==Component Source Code==


COMMSA
Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_MCP44xx_Digital_Pot.fcfx FC_Comp_Source_MCP44xx_Digital_Pot.fcfx]
 
Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_MCP44xx_Digital_Pot.fcfx FC_Comp_Source_MCP44xx_Digital_Pot.fcfx]


==Detailed description==
==Detailed description==




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==Examples==
==Examples==




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==Downloadable macro reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
 
 
 
 
 
 
 
 
==Macro reference==
 
===DecrementWiper===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''IncrementWiper'''
| width="90%" class="mtx-class-macrohead" | '''DecrementWiper'''
|-
|-
| colspan="2" | Increments a single volatile wiper value 
| colspan="2" | Decrements a single volatile wiper value 
|-
|-
|-
|-
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===IncrementWiper===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''DecrementWiper'''
| width="90%" class="mtx-class-macrohead" | '''IncrementWiper'''
|-
|-
| colspan="2" | Decrements a single volatile wiper value 
| colspan="2" | Increments a single volatile wiper value 
|-
|-
|-
|-
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===Initialise===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SetWiper'''
| width="90%" class="mtx-class-macrohead" | '''Initialise'''
|-
|-
| colspan="2" | Sets the value of a single wiper 
| colspan="2" | Startup the I2C peripheral ready for communications. 
|-
|-
| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
| width="90%" | Index
|-
| colspan="2" | Range: 0-3 
|-
| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" | Value
|-
|-
| colspan="2" | 129 Taps Range: 0-128 / 257 Taps Range: 0-256 
|-
| width="10%" align="center" | [[File:Fc9-bool-icon.png]] - BOOL
| width="90%" | MemoryType
|-
| colspan="2" | 0=Volatile, 1=Nonvolatile 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===ReadAddress===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ReadAddress'''
| width="90%" class="mtx-class-macrohead" | '''ReadAddress'''
|-
|-
| colspan="2" | Reads a value from one of the registers on the device 
| colspan="2" | Reads a value from one of the registers on the device 
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===SetWiper===
{| class="mtx-class-macrotable wikitable"
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''WriteAddress'''
| width="90%" class="mtx-class-macrohead" | '''SetWiper'''
|-
|-
| colspan="2" | Writes a value to one of the registers on the device 
| colspan="2" | Sets the value of a single wiper 
|-
|-
|-
|-
| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
| width="90%" | Address
| width="90%" | Index
|-
|-
| colspan="2" | Range: 0-15 
| colspan="2" | Range: 0-3 
|-
|-
| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" | Value
| width="90%" | Value
|-
|-
| colspan="2" | Range: 0-256 
| colspan="2" | 129 Taps Range: 0-128 / 257 Taps Range: 0-256 
|-
| width="10%" align="center" | [[File:Fc9-bool-icon.png]] - BOOL
| width="90%" | MemoryType
|-
| colspan="2" | 0=Volatile, 1=Nonvolatile 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
===WriteAddress===
{| class="mtx-class-macrotable wikitable"
|-
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
| width="90%" class="mtx-class-macrohead" | '''WriteAddress'''
|-
| colspan="2" | Writes a value to one of the registers on the device 
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Initialise'''
|-
|-
| colspan="2" | Startup the I2C peripheral ready for communications. 
| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
| width="90%" | Address
|-
|-
| colspan="2" | Range: 0-15 
|-
| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
| width="90%" | Value
|-
| colspan="2" | Range: 0-256 
|-
|-
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
| width="90%" style="border-top: 2px solid #000;" | ''Return''
| width="90%" style="border-top: 2px solid #000;" | ''Return''
|}
|}




==Property reference==
==Property reference==


{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
{| class="mtx-class-macrotable wikitable"
|-
| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-prop-icon.png]]
| width="90%" class="mtx-class-macrohead" | '''Properties'''
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
|-
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''
| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
| width="90%" class="mtx-class-propfolder" | I2C Properties
|-
|-
|-
|-
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|-
|-
| colspan="2" | 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.  
| colspan="2" | 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.  
|-
| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
| width="90%" class="mtx-class-propfolder" | Device Properties
|-
|-
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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| colspan="2" |  
| colspan="2" |  
|-
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
| width="90%" | Scope Traces
| width="90%" class="mtx-class-propfolder" | Simulation
|-
| colspan="2" | Selects if the component pin connections are automatically generated on the data recorder window or not. Yes: Automatically add the component pins to a group on the data recorder which will reflect the sim data during simultion. No: Do not show the pin signals on the data recorder window. 
|-
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
| width="90%" | Console Data
|-
| colspan="2" | Selects if the console data is automatically generated or not 
|-
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
| width="90%" | API
|-
| colspan="2" | Specifies the injector component on the panel to interact with to provide comms simulation. 
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Connections'''
|-
|-
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Simulations'''
|-
|-
|-
|-

Latest revision as of 14:36, 13 July 2026

Author Matrix TSL
Version 1.0
Category Analog Output


Digital Potentiometer (MCP44XX) component

The MCP44XX device range supports 4 digital potentiometers or rheostat outputs. 129 or 257 possible output resistance values for each channel.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_MCP44xx_Digital_Pot.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_MCP44xx_Digital_Pot.fcfx

Detailed description

No detailed description exists yet for this component

Examples

No additional examples







Macro reference

DecrementWiper

DecrementWiper
Decrements a single volatile wiper value 
- BYTE Index
Range: 0-3 
- VOID Return


IncrementWiper

IncrementWiper
Increments a single volatile wiper value 
- BYTE Index
Range: 0-3 
- VOID Return


Initialise

Initialise
Startup the I2C peripheral ready for communications. 
- VOID Return


ReadAddress

ReadAddress
Reads a value from one of the registers on the device 
- BYTE Address
Range: 0-15 
- UINT Return


SetWiper

SetWiper
Sets the value of a single wiper 
- BYTE Index
Range: 0-3 
- UINT Value
129 Taps Range: 0-128 / 257 Taps Range: 0-256 
- BOOL MemoryType
0=Volatile, 1=Nonvolatile 
- VOID Return


WriteAddress

WriteAddress
Writes a value to one of the registers on the device 
- BYTE Address
Range: 0-15 
- UINT Value
Range: 0-256 
- VOID Return


Property reference

Properties
I2C Properties
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.  
Device Properties
Number of Taps
 
Address Bits
 
Simulation
Simulate Comms
 
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