Tuesday, March 19, 2013
Electrical Isolation For I2C Bus
Electrical Isolation For I2C Bus Circuit Diagram
Resistors R1, R4, R5, and R8, are the usual 3.3 kΩ pull-up resistors that are obligatory in each I2C line. If these resistors are already present elsewhere in the system, they may be omitted here. The current drawn by the circuit is slightly larger than usual since the pull-up resistors are shunted by the LEDs in the optoisolators and their series resistors. Nevertheless, it remains within the norms laid down in the I2C specification.
Labels:
bus,
electrical,
for,
i2c,
isolation
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