mikebounds
- Jan 25, 2017
- 8
- Joined
- Jan 25, 2017
- Messages
- 8
What is the lowest power possible for driving segment LCD glass where most of the time the LCD display will just display the time with an accuracy of at least 20ppm.
As I understand the components consuming power would be:
I found this whitepaper:
http://www.nxp.com/assets/documents/data/en/white-papers/S08LL16PWRCMPWP.pdf
which is a good starting point as this would seem to state the most important thing is the standby power mode of the micro-controller and this says the NXP S08LL16 would use 3.3uA @ 3.6V (11.9uW), but this whitepaper is over 7 years old, so I didn't know if there are more efficient micro-controllers now?
I found MSP430FR413x which has a low-power mode with LCD on (LPM3), of 1.25uA @ 3V, but this figure is without the charge pump enabled - is this something that MUST be enabled for a usable display?
Thanks
Mike
As I understand the components consuming power would be:
- Glass LCD segment display (dependent on number and size of segments)
- External RTC chip
- Micro-controller
I found this whitepaper:
http://www.nxp.com/assets/documents/data/en/white-papers/S08LL16PWRCMPWP.pdf
which is a good starting point as this would seem to state the most important thing is the standby power mode of the micro-controller and this says the NXP S08LL16 would use 3.3uA @ 3.6V (11.9uW), but this whitepaper is over 7 years old, so I didn't know if there are more efficient micro-controllers now?
I found MSP430FR413x which has a low-power mode with LCD on (LPM3), of 1.25uA @ 3V, but this figure is without the charge pump enabled - is this something that MUST be enabled for a usable display?
Thanks
Mike