Hello all,

I need to design a extender circuit for SPI signal which is 1 MHz clock signal. I designed a circuit with SN65C1167 and it works over 40 meter but we need to add one cable more because it works with RS485. I'm looking for SPI extender which already need 3 cable which are CLK, DATA and GND.

I saw some circuits as you can see links. Two designs are working with WS2811 series and CLK is 400 kHz and 800 kHz. One of that design uses opto and a IC. I try to use 6N137S opto and level shifter circuit at attached but level shifter doesn't charge cable. I'm thinking to use line driver after opto. Could you have any idea for this problem or do you know what that IC ?

http://www.led-studien.de/repeater-fuer-ws2801-pixel/

 

single ended , 40 meters, un screened cable, 1 MHz ,

forget it.

The more you boost the voltage, the more noise it will generate ,

You need differential signals,

 

andrewmm thank you for your message. I check this link and see it says 200 meter. I think it is not differential. Could you guess that IC which is shaven.

http://myneopixel.com/dc5-12v-spi-amplifier-repeater-for-ws2811-ws2801-ws2812b_p0935.html

 

andrewmm thank you for your message. I check this link and see it says 200 meter. I think it is not differential. Could you guess that IC which is shaven.

http://myneopixel.com/dc5-12v-spi-amplifier-repeater-for-ws2811-ws2801-ws2812b_p0935.html

they specify words to effect of 'should work up to m , at 400 KHz, '

you want 1 MHz...


https://cdn-shop.adafruit.com/datasheets/WS2812.pdf