====== lamaPLC: Signal level converters ======
===== PCA9306 I²C Voltage Level Translator =====

When the supply voltages are mismatched, the best option is to use a dedicated device to bridge them.

Allows voltage level translation between:
  * 1.0V Vref (1) and 1.8V, 2.5V, 3.3V or 5V vias (ref) (2)
  * 1.2V Vref (1) and 1.8V, 2.5V, 3.3V or 5V vias (ref) (2)
  * 1.8V Vref (1) and 3.3V or 5V Vbias (ref) (2)
  * 2.5V Vref (1) and 5V Vbias (ref) (2)
  * 3.3V Vref (1) and 5V Vbias (ref) (2)

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The next image shows an example of using an I2C voltage-level translator to bridge communication between two different supply voltages. There are two sets of pullups, one for each voltage level. As a common voltage translator, the PCA9306 enables communication between different supply levels:

{{:sensor:i2c_3.png|PCA9306 I²C Voltage Level Translator}}

Application of PCA9306 for I²C communication: [[:com:basic_i2c#i_c_arduino_with_33v|here]].

Several manufacturers produce compact modules using the PCA9306 IC. The picture below shows DollaTek's module (for example, you can find it on Amazon):

|{{:sensor:pca3906.png?150|PCA9306 I²C Voltage Level Translator Modul}}|{{:sensor:pca9306_4.png?200|PCA9306 I²C Voltage Level Translator}}|

===== I2C topics on lamaPLC =====
{{topic>i2c}}

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