DM42 News

[grsbanks]

(03-28-2017 06:22 AM)brouhaha Wrote:  50 µW for the display, plus power for a boost regulator to step the battery voltage up to the 5V needed by the display. Even the most efficient available boost regulators for that purpose consume another 50 µW or more. In the calculator prototypes Richard Ottosen and I have shown at the HHC Conferences, which run Free42 w/ display patches using that same LCD, when the calculator is turned off we actually remove power from the display and the boost converter, so that the display power consumption is 0 µW rather than around 100 µW.

I've just been in touch with SwissMicros' Michael Steinmann for something else and raised the point of the 42's display. He has this to say (posted with his permission):

The LCD does need a 5V booster as mentioned by Eric Smith, but our booster has an enable pin which we simply turn off and the consumption goes down close to zero.

Currently we're well below 10µA in OFF mode for the total consumption of the calculator (all of that goes to the CPU), but the goal is less than half of that with adjustments to the software.