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      I stopped working on getting out of SNVS mode and settled for the 27 uA or so standby consumption. If I read the data BOOK correctly, the only way to wake up from SNVS is to use a timer. But I'd need that to be once or twice a second so as to...
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      Yes, the processor never sees 3.6 V, there's >0.5V through the diode on the Teensy board.
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      Awesome. Works instantly, then just imported it as a header file and drew it the slow way (probably there's a faster image writer function somewhere) #include "logo250x46.h" void drawImage(int16_t x, int16_t y) { for (int16_t j = 0; j < 46...
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      Thanks, so if I make sure that all code I'm using fits in (and is running from) RAM1, then I am safe to write a private version of the EEPROM write code? I'm pretty much only running things that are performance critical on this one. Of course...
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      Thanks Paul for the first answer. I've been testing and so far it's faster than the fast end of the spec, if I read the address scattering code right. I can get it to go away for a good chunk of a second for multiple sector erases, but nothing...
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      The T4 and 4.1's EEPROM emulation using Flash ROM has to sometimes erase a sector. This takes 0.045 to 0.400 seconds to do and the code is completely blocking- interrupts are disabled during this time. (eeprom.c in...
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      From a couple of CR2032 battery data sheets, it looks like they run 3.0V or less most of their life, but for a bit at the beginning. Dropping voltage shouldn't be needed. You could measure the current consumption using a good multimeter in...
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      The processor manual has this temptation to try for wakeup on pin (state? change?): 11.4.1 SW_MUX_CTL_PAD_WAKEUP SW MUX Control Register (IOMUXC_SNVS_SW_MUX_CTL_PAD_WAKEUP) MUX_MODE : MUX Mode Select Field. Select 1 of 2 iomux modes to be used...
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      Yep - just a thing to watch out for, and a solution. Rechargeable lithiums also go to 4V or so while charging, so that's something to regulate down for longest battery life. The big surprise is that the consumption goes UP when you turn the...
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      Hi ChrisR, I've just started experimenting with SNVS mode also. See my piping up on https://forum.pjrc.com/index.php?threads/beware-t4x-rtc-power-consumption.64216/ for more infoz. Note my mention there that a battery much over 3V will be...
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      More on getting the standby (xtal RTC only) current down, and a question (anybody listening to this thread? :) Currently I'm using the same large 3.6V lithium (Tadrian TL-4902 non-rechargeable) battery, but with two silicon diode drops in series...
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