Remember that I said we probably didn't need the WAKEUP signal.  I'm so glad you ignored me.   Today I managed to put the DW into a deep sleep, from which it was supposed to wake up after 5 seconds.  It didn't.

Worse still I couldn't get it to wake up by resetting it.  
The manual says that another way to wake it up is to hold the Chip Sel low for 200uS and read a whole bunch of data.   That didn't work
So I was left with the WAKEUP line, which has to be held high for 200 uS.  Fortunately this worked.

I thought I had a door stop for a while!


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