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I have a circuit that uses software implemented SPI to control two
devices. Both use CS pins to select between the devices. The circuit
(my light recorder artwork) is supposed to be low power, IE uA, so
99.99% of the time CS is high and the chips turn off and go into
high-impedance mode.

This leaving my SPI input pin floating isn't it? I already installed a
simple 100k pull down resistor to prevent this on two of the devices,
before that my multimeter definetely seemed to show the pin
floating as you would expect.

However... I've already made one, and it's running and well embedded
behind a good half inch of hermetically sealed acrylic and is definetely
not coming out. The pcb was well cleaned and the atmosphere is dry, so
anything floating should stay floating.

So what can I expect from this mistake? The circuit has been working
perfectly otherwise for 3 weeks now, but what about increased power
drain? Any rule-of-thumb for what it might be? 

- -- 
http://petertodd.org
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