Other Parts Discussed in Thread: TPL5110, SN74AUP2G14, TPL5111
Tool/software:
Hi Ron,
Happy New year. The engineer who designed my original circuit has been working to get the circuit to work with TPL5110-Q1. He has gotten the switch to work but this chip outputs a low signal instead of a high like the 555. This means that the datasheet wants to use the part to switch the plus side of the battery not the negative. We are working with the negative side so we need to invert the output signal to get it to work. Is there an easy solution that you can suggest?
This is to clarify the issue I am having.
The TPL5110 chip outputs a low when active instead of a high like the 555 did. The issue is that we can't just use a FET to turn the negative of the battery on and off. The output of the chip needs to to be inverted so that it gives us the high that we need. The inverter chip being an active part uses current from the battery too. The TPL5110 chip uses 45nA which is great but the lowest power consuming inverter I can find uses 500uA. My goal is that the 3v cr2032 battery must last more than a year. Another concern is the height of any chip we introduce needs to have a height no more then 1.2mm.
I have found a low power inverter shmitt trigger SN74AUP2G14. Don't know if that can work or if there's anything better.
OR.. If we switch the positive side of the battery on and off, the problem solves itself. Is there a reason we can't do that?
Thanks,
Allan
