opto isolator for SPI communication

[gehan_s]

Hi all,

Can someone please suggest me a suitable opto-isolator for SPI communication. It should be cheap :grin: and thru-hole. This is to isolate a pic18f and a ade7758 ic. I am hoping to use a 4MHz crystal for the pic.

Thanks in advance !!!!!

 

[goldsmith]

Hi all,

Can someone please suggest me a suitable opto-isolator for SPI communication. It should be cheap and thru-hole. This is to isolate a pic18f and a ade7758 ic. I am hoping to use a 4MHz crystal for the pic.

Thanks in advance !!!!!

Hi Gehan
So is that means that your communicated signal through this opto coupler is a 4MHZ signal ?can you tell me a bit more about your required specifications ?
Best Wishes
Goldsmith

 

[gehan_s]

hey thanks goldsmith,

actually the 4MHz is the pic's clock input (to pins OSC1 and OSC2). the clock frequency for SPI communication will be derived from that, eg - fosc/4,fosc/16,fosc/64. what frequency would you suggest (i was thinking of using fosc/4 which in my case is 1MHz). the main concern is finding an opto to operate in these frequencies. (i have some JC817 with me but haven't tested them yet)

thanks !!!!!!!!!!!!

 

[iukhan]

Use PC817, it is cheap as well as it will fullfill your isolation requirement for SPI.

 

[goldsmith]

Use PC817, it is cheap as well as it will fullfill your isolation requirement for SPI.

Hi again
There are several options available for this aim . e.g 6n137 or LTV817 or .. etc
Best Wishes
Goldsmith