Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
LED shines when off.
#5
Hi
I thought I'd report on what I achieved.

My initial idea was to use the 74hc08 (an and gate) as a relay. It worked OK but it didn't reduce the current when the display was off.

I then tried using a small 4 pole pcb relay so the data lines are only connected when the MSP430 is powered up. That reduced the battery backup current to about 36uA. At that rate the battery should last long enough for the shelf life of the battery to be an issue, which is good enough for me.

Russell
Reply


Messages In This Thread
LED shines when off. - by Russell - 12-07-2020, 07:38 PM
RE: LED shines when off. - by Yuriy - 12-07-2020, 08:14 PM
RE: LED shines when off. - by Russell - 12-08-2020, 11:00 PM
RE: LED shines when off. - by Yuriy - 12-15-2020, 07:20 AM
RE: LED shines when off. - by Russell - 01-05-2021, 10:50 PM

Forum Jump:


Users browsing this thread: 1 Guest(s)