![]() ![]() The SPI clock frequency can be as low as 1/256 of the PIC oscillator frequency, Ill have to scavenge for some optocouplers in my junkbox and look for rise/fall times. If you need to be really miserly, you might resort to building your own (say with planar coils and RF design). Doing optocouplers on multi-MHz SPI lines is not as easy as a 115k2 uart line. Isolated bidirectional, I 2 C compatible, communication Supports up to 1-MHz operation 3-V to 5.5-V supply range Open-drain outputs With 3. There may also be power advantages, say, if you need to be miserly with battery power (a logic level opto probably uses less bias on the output side). (You can't invert a 6N136 output in the same way without defeating the high speed feature.) For more, I'd go with logic level parts, or iCoupler style devices. It uses Optocouplers (also known as Photocouplers or Optical Isolators). This board is helpful for connecting digital systems (like a 5V microcontroller) to a high-voltage or noisy. The I2C-Opto8 is designed to accept digital input from up to 8 independent sources. The I2 C-bus is fabulously popular and successful as a low-cost way to attach. This is a board designed for opto-isolation. I am building two PCBs, one which will house. Or the 4N35 can be wired "emitter follower" style (though it's not actually following anything), in case you need the diode end in a particular direction and you need the inverted (or not) output. Opto-electrical isolation of the I2C-Bus - (2022). Electronic Does resistor choice for I2C with optical isolation depend on voltage or speed. Both of these, you just add a pull-up to the open collector output. Industrial Fieldbus Communications Microprocessor System Interface (SPI, I2C, etc.). ![]() (Hmm, I have the schematic of the circuit I was referring to, but it doesn't look like I posted it there.) For doing better on the cheap, I would go with 6N136, or the high dV/dt equivalent SFH6345 (be warned, the dV/dt rating on 6N136s is very misleading). Performance of a Digital Isolator with safety of an optocoupler. 4N35 level optos are pretty bad, you wouldn't want to use them above 100kbps or so without special hardware. The NCID9211 is a galvanically isolated full duplex, bidirectional, highspeed dualchannel digital isolator with output enable.
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