Hello,
I am using Analog Devices ADuC836 micro-controller. As per my application total current consumption of all module of micro-controller must not exceed 2.5 mA. I am using inbuilt 16 bi Delta Sigma ADC, 12 bit DAC, external refernce (2.5V) for ADC, Clock frequency approx. 3MHz.
I've gone through the datasheet, but didn't found anything how to lower power consumption... Uunused pins should be connected thus (pullup / pulldown / floating / configure as input or out put).....
Can anyone point me to an application note or other info that could help? If I don't find any more info I'll simply connect the unused pins to ground...
Thanks.
"Question is that, WHAT TO DO WITH UNUSED PINS to reduce power consumption ???"
Depends what purpose the individual pins have and what the can be configured to be.
If they can be configured as an open collector output, then that would normally be best.
If they are only usable as inputs, then you might need to put a high value pull up resistor on.
Then, as Tamir suggested, if a pin is connected to an unused on-chip peripheral then that on-chip peripheral should be switched off.
The answer is - Go through each in turn, find out what it can do and select the lowest power option.