Gravity Digital I2C Signal Isolator Optocoupler

The DFRobot Gravity signal isolator galvanically isolates an I2C signal and powers the connected sensor module via its own isolated 5 V converter. This keeps sensors from interfering with each other, such as pH and conductivity sensors in the same tank, and a running pump no longer disturbs the measurement. The isolator is plugged in between the microcontroller and the DFRobot I2C module; nothing changes in the program.

For analog sensors there is the Gravity Analog Signal Isolator Optocoupler.

Features:

• Isolated 5 V converter with 0.75 W on board, no additional supply needed
• Controller connector to the microcontroller, Module connector to the sensor
• All pins on the Module side are isolated from the Controller side, do not connect them
• The Module side delivers at most 150 mA, observe the current draw of the sensor
• Suits almost all DFRobot I2C modules with Gravity connector
• The isolator gets warm during operation, this is normal

Application Examples:

• Several water quality sensors in the same container
• Measurements next to pumps or motors that introduce interference into the water
• Protecting the microcontroller from interference on the sensor side

Documentation:

• Wiki DFRobot DFR0565 with connection example
• Schematic (PDF)
• Dimension drawing (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: DFR0565
• Operating voltage: 5 V
• Connectors: 2× PH2.0-4P (+, −, C, D)
• Interface: I2C, 3.3 V level
• Controller side: supply 5.0 V ±0.15 V, no-load current 15 mA typical
• Module side: output 5.0 V ±0.15 V, at most 150 mA
• Dimensions: 42 × 32 × 8.8 mm
• Weight: 22 g

Scope of Delivery:

• 1× Gravity Digital I2C Signal Isolator
• 1× Cable PH2.0-4P to PH2.0-4P
• 1× Gravity I2C cable 4-pin PH2.0 to XH2.54, 30 cm
• 2× XH2.54 pin header 4-pin