OBJEX-Labs / Smart-DoorWindow-sensor

Open source Smart door/window sensor. ELPMs based with a custom power latch to obtain a deep sleep mode current of (1-100nA).
https://objexlabs.com/
CERN Open Hardware Licence Version 2 - Weakly Reciprocal
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Question about Power consumption #5

Open Gafielt opened 8 months ago

Gafielt commented 8 months ago

Hi Salvatore, I am very impressed by the power consumption you have achieved. I tried to understand how you got as low as 24nA, but sadly can't fully wrap my head around it. In the simulation you have provided, the numbers make sense to me (all currents for the transistors). I am only a bit sceptical about the xor chips. In the datasheet, it is said, that they would consume 10uA (which is quite a lot in your case). The resistors for detecting the switch state do also use about 400nA. Do you have any clue what I am missing or did you just had luck in the chip lottery (i guess)?

Thanks in advance! Great project!