It’s pretty easy, it’s just one rotation (the coin falling over) with the coin spinning. You just have to put the coin in a null and spin that to make it easily controllable. Here’s an example I just made.
https://homepage.mac.com/bdjones/.public/coinspin.zip
The only tricky part is the coin rotates on it’s center which leaves it in the air if it’s not moved down but a linear down motion is wrong – you have to tweak the F-Curves to keep the coin on the ground. Check the F-Curves for the coin.
You could just tweak the values to adjust the number of spins and the speed of fall but this is the general idea.