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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:
Application of PCA9306 for I²C communication: 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):
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I2C topics on lamaPLC
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