The I2C switch it is possible to switch four I2C buses in any combination to a master.
Also its possible multiple I2C slaves with the same bus address to connect to the I2C bus.
The I2C switch it is possible to switch four I2C buses in any combination to a master.
The tension adjustment in the PCA9545 can also have different bus voltages eg 1.8 V, 2.5 V, 3.3 V and 5 V are coupled.
About the control register can be switched between the four bus segments. The selection of the channel via the I2C-bus.
With the switch it is also possible to combine several single I2C slaves with the same bus address with a master.
In the double-sided printed circuit board with 42 x 64 mm, the I2C block PCA 9545, terminals for each bus line and the resistors housed for termination of the four bus lines.
The SMD chip in SO-20 housing can be well soldered by hand on the tin-plated circuit board. Who the trusts do not own, you can order the kit also with pre-PCA 9545. Furthermore, the circuit board can be fitted as with all DIN rail modules with either fixed or plug-in terminals.
Was ist der Unterschied zwischen dem I2C-Switch PCA9545 und dem I2C-Multiplexer PCA9544?
- The switch has two address pins, the multiplexer has three.
- A maximum of four switches are connected to one master.
- When I2C switch any channel combinations can be connected to the master.
- The switch has a RESET input with which all channels are deselected.
This behavior indicates the switch also when power is ON.
On all four channels (inputs) is also the INT-signal. Once connected slave pulls the INT signal on one channel at low this will be indicated at the output and then "passed through" to the master. He is practically a ORing all four INT-channel inputs.
About the reading of the register can be determined which of the four channels has triggered the interrupt.
At the two jumpers address the I2C slave address can be set. It can be operated on a master that is up to four I2C switches.
PCA9545A: 224, 226, 228, 230
The switch can also be used for level matching between different bus voltages. In the data sheet for PCA9545A Allows voltage level translation is between 1.8 V, 2.5 V, 3.3 V and 5 V buses. To do this, unplug the termination jumper of the corresponding channel and terminate on the slave with 4,7kOhm resistors to + 1.8V, 2.5V 3.3V.
Dimension of the printed circuit board 42 mm x 63 mm
Program examples can be found on the homepage
http://www.horter.de/i2c/i2c-switch/i2c-switch-Programmbeispiel.html
| 2 | Resistor network 6x 4,7k |
| 1 | ceramic capacitor 100 nF |
| 1 | Resistor 4,7k |
| 1 | PCA9545A SMD SO-20 soldered if you whant |
| 15 | pin connectors 3 pol and Jumper |
| 4 | terminal 5 pol fix or plug in |
| 1 | terminal 6 pol fix or plug in |
| 1 | PCB Double-sided lead-free tin with solder mask |
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