Component: I2C Multiplexer (TCA9548A) (Comms: System)
| Author | MatrixTSL |
| Version | 1.0 (Release) |
| Category | Comms: System |
Contents
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.
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.
Downloadable macro reference
SelectChannel
Selects a single output channel to multiplex the I2C output to (0-7).
Parameters
- BYTE Channel
- Range: 0-7
Return value
- This call does not return a value
SetChannelMask
Allows a user determined number of channels to be connected to the I2C bus.
Parameters
- BYTE Mask
- Range: 0-255 / Bit0=CH0 EN / Bit1 = CH1 EN etc
Return value
- This call does not return a value
Initialise
Startup the I2C bus ready for communications.
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
Address Bits
This property is of type Fixed list of ints and can be referenced with the variable name AddressBits.
No additional information
Channel
This property is of type Fixed list of ints and can be referenced with the variable name cal_i2c1::CHANNEL.
Channel selection
SDA
This property is of type Single digital pin and can be referenced with the variable name cal_i2c1::SDA.
Pin used for SDA (data signal)
SCL
This property is of type Single digital pin and can be referenced with the variable name cal_i2c1::SCL.
Pin used for SCL (clock signal)
Stop Delay
This property is of type True or false and can be referenced with the variable name cal_i2c1::StopDel.
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
This property is of type Fixed list of ints and can be referenced with the variable name cal_i2c1::BAUD_LIST.
Baud rate option selector
Baud Rate
This property is of type Signed integer and can be referenced with the variable name cal_i2c1::BAUD.
Baud rate to be used
Simulate Comms
This property is of type True or false and can be referenced with the variable name SimComms.
No additional information
Scope Traces
This property is of type True or false and can be referenced with the variable name cal_i2c1::ScopeTraces.
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.
Console Data
This property is of type True or false and can be referenced with the variable name cal_i2c1::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_i2c1::Injector.
Specifies the injector component on the panel to interact with to provide comms simulation.
