Component: I2C Multiplexer (TCA9548A) (Comms: System)

Author	MatrixTSL
Version	1.0
Category	Comms: System

I2C Multiplexer (TCA9548A) component

An I2C multiplexing IC allowing up to 8 different I2C busses to be connected to a single I2C channel on your target microcontroller.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_I2C_Multiplexer_TCA9548A.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_I2C_Multiplexer_TCA9548A.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Here we have a simple example showing how to use the multiplexer to connect multiple of the same I2C sensor IC to the microcontroller.

The multiplexer IC is connected directly to the microcontroller I2C pins and up to 8 temp/humidity sensors are connected to the CH0-CH7 I2C pins of the multiplexer.

I2C Multiplex Example

Macro reference

Initialise

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

SelectChannel

	SelectChannel
Selects a single output channel to multiplex the I2C output to (0-7).
- BYTE	Channel
Range: 0-7
- VOID	Return

SetChannelMask

	SetChannelMask
Allows a user determined number of channels to be connected to the I2C bus.
- BYTE	Mask
Range: 0-255 / Bit0=CH0 EN / Bit1 = CH1 EN etc
- VOID	Return

Property reference

	Properties
	Multiplexer Properties
	Address Bits
	I2C Properties
	Connections
	Channel
Channel selection
	SDA
Pin used for SDA (data signal)
	SCL
Pin used for SCL (clock signal)
	Options
	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.
	Baud Select
Baud rate option selector
	Baud Rate
Baud rate to be used
	Simulation
	Simulate Comms