Re: More on the new 12C Message #17 Posted by Katie Wasserman on 25 July 2009, 11:51 p.m., in response to message #16 by Eric Smith
Surprisingly current consumption has increased a bit with the latest firmware. I had made earlier measurements and posted to this forum and I've now re-tested using the exact same setup and confirmed on two different 12C+ calculators.
Here's what I found:
Condition Old firmware New firmware
------------------------------ ----------- -------------
power off 4uA 4uA
power on, static display,
no keystrokes 45uA 45uA
continuous keystrokes
(number entry) 1mA 2mA
long amortization function 15mA 20mA
tight program loop 15mA 20mA
continuous self-test ([ON]+[+]): 4mA 12mA
extended test modes
([ON]+[g] and [ON]+[g]+[ENTER])
static display 1.8mA 2.5mA
When running, the average clock speed must be higher, a lot higher when running the continuous self test. I say average clock speed because I believe that the firmware frequently changes the clock speed.
Cyrille and Eric, do these current measurements make sense to you?
Thanks,
Katie
Edited: 25 July 2009, 11:52 p.m.
|