Thursday, 31 July 2014

spi - Isolate microcontroller from board and use other one


The attached circuit block diagram shown in the rectangular box is my development board. It has microcontroller 1, which communicates with a SPI slave device (4 SPI line + 3 IO). 3.3V power goes to microcontroller 1 via a 0 ohm resistor.


Now I need to isolate this microcontroller 1 and make my slave device to communicate with the other microcontroller 2 . I do not want to cut tracks or remove microcontroller 1. So I think I can remove the 0 ohm resistor from microcontroller 1 section (see image). Now as per diagram I have two masters and one slave, but one master is not powered on, will this scheme work or not?



enter image description here




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