Any VCC, 5 12 18 24V, they share the same ground. Mixed voltage system has a single ground. Why ground should be different is based on the category of the return signal. I always split 3 ground for my project, Power GND, AGND, and DGND.its all depend on the verity of component's VCC supply.
avdrummerboy said:Ground basically means the negative supply line, so each different positive line in has to have somewhere to go, the negative, aka ground.
marco antonio said:Apart from the different grounds for digital and analog signals care need to be taken in isolating the ESD ground from the electrical ground. The base of the setup table is usually connected to the ESD ground in most cases and the electrical ground should be isolated from it using high resistance (typically less than 1Meg).
The resson is the static discharge may damage the device through the electrical ground pin return path.
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