Anyone have experience good or bad with these digital isolator ICs?
The ADum1200 series is from Analog Devices. The Si8600 is from Silicon Labs. Each seems to do the job, but the SL chip is about 50% the cost...
The ADum1200 series is from Analog Devices. The Si8600 is from Silicon Labs. Each seems to do the job, but the SL chip is about 50% the cost...
The SI84xx series uses the same technology as the SI86xx series - some kind of internal RF TX+RX across an internal isolation barrier within the IC. From what I can tell from the manufacturer and resellers, the SI84xx series is obsolete and no longer stocked or available for purchase in low quantities. But if it worked for you, then the SI86xx series should also work fine, and it seems very easy to implement.
Thanks for the info!
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This approach (using optocouplers) has problems.
From the datasheet:
The physical interface consists of two wires: serial data (SDA) and serial clock (SCL). These wires are connected to open collector drivers that serve as both inputs and outputs. At first glance, it appears that SDA and SCL can be isolated simply by placing two unidirectional isolators in parallel, and in opposite directions. However, this technique creates feedback that latches the bus line low when a logic low asserted by either master or slave. This problem can be remedied by adding anti-latch circuits, but results in a larger and more expensive solution.
Thanks for the hint about 84xx beeing obsolete. I too guess that 86xx series will work fine too. It is indeed easy to implement provided general high speed digital design rules are taken into account. Take care for proper supply line decoupling.
I am using it for I2C control of an ADC. The xx05 has two additional unidirectional channels which work fine for interupt and reset signal. It also works well as level translator btw (ADC 3.3V, Arduino 5V) 😉
kind regards, Daniel
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