Component: IO Expander (PCF8575) (PCF8575) (General Input)

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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

Fc9-comp-macro.png Initialise
 
Fc9-void-icon.png - VOID Return


ReadPort

Fc9-comp-macro.png ReadPort
Reads the current input value of the I/O pins. 
Fc9-u16-icon.png - UINT Return


WritePort

Fc9-comp-macro.png WritePort
Writes an output value to the IO pins 
Fc9-u16-icon.png - UINT Value
Value to write. Range 0-65535 
Fc9-void-icon.png - VOID Return


Property reference

Fc9-prop-icon.png Properties
Fc9-conn-icon.png I²C Communications
Fc9-type-16-icon.png Device Type
 
Fc9-type-16-icon.png External Address
Selects the value of the three address pins for the MCP23S17. 
Fc9-type-16-icon.png Channel
Channel selection 
Fc9-type-7-icon.png 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.  
Fc9-type-16-icon.png Baud Select
Baud rate option selector 
Fc9-type-14-icon.png Baud Rate
Baud rate to be used 
Fc9-type-5-icon.png SDA
Pin used for SDA (data signal) 
Fc9-type-5-icon.png SCL
Pin used for SCL (clock signal) 
Fc9-conn-icon.png Simulation
Fc9-type-10-icon.png Label
 
Fc9-type-7-icon.png Scope Traces
Selects if the scope traces are automatically generated or not 
Fc9-type-7-icon.png Console Data
Selects if the console data is automatically generated or not 
Fc9-type-16-icon.png API