Component: IO Expander (PCF8575) (PCF8575) (General Input): Difference between revisions
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Revision as of 14:36, 13 July 2026
| Author | Matrix TSL |
| Version | 1.0 |
| Category | General Input |
IO Expander (PCF8575) component
Provides 16 digital input/output pins arranged into 8-bit ports using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8575 device allowing up to 8 expanders to be connected to the same I2C bus.
Component Source Code
Please click here to download the component source project: FC_Comp_Source_IOEXP_PCF8575.fcfx
Please click here to view the component source code (Beta): FC_Comp_Source_IOEXP_PCF8575.fcfx
Detailed description
No detailed description exists yet for this component
Examples
No additional examples
Macro reference
Initialise
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Initialise |
 - VOID
|
Return |
ReadPort
|
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ReadPort |
| Reads the current input value of the I/O pins. | |
 - UINT
|
Return |
WritePort
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WritePort |
| Writes an output value to the IO pins | |
| - UINT
|
Value |
| Value to write. Range 0-65535 | |
| - VOID
|
Return |
Property reference
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Properties |
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I²C Communications |
|
Device Type |
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External Address |
| Selects the value of the three address pins for the MCP23S17. | |
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Channel |
| Channel selection | |
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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. | |
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Baud Select |
| Baud rate option selector | |
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Baud Rate |
| Baud rate to be used | |
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SDA |
| Pin used for SDA (data signal) | |
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SCL |
| Pin used for SCL (clock signal) | |
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Simulation |
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Label |
|
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Scope Traces |
| Selects if the scope traces are automatically generated or not | |
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Console Data |
| Selects if the console data is automatically generated or not | |
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API |