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Quoted from zaza:Biggest question is, what is the power consumption of NVRAM. Is it the same as the static-RAM (1milliAmp or 100 microAmp) or does it suck the batteries empty in a week ?
Standby Current of an e.g. FM16W08 is only 20µA.
Quoted from alienagent:Which WPC games do something with the real time clock?
I know of Junkyard, Twilight zone and Scared stiff, is there anything else to add to my list?
I had already posted that in another thread 2 yeras ago:
Here is the list based on my experience:
WPC (Fliptronics2)
Creature from the Black Lagoon (no play of different music based on date(***))
Twilight Zone (clock on playfield does show correct time)
WPC Security (WPC-S)
Dirty Harry ("real" midnight madness)
Johnny Mnemonic ("real" midnight madness)
WHO dunnit ("real" midnight madness)
Theatre of Magic ("hermaphrodite position" - "unreal" midnight madness - does not depend on RTC, more a game feature/game mode)
WPC-95
Congo ("real" midnight madness)
Junk Yard ("real" midnight madness)
NBA Fastbreak ("real" midnight madness)
(***)
Explaination by pinside-user "TheKorn" in another thread:
"...I'm admittedly being pedantic here, but Creature's music selection is NOT based on the day of the week! (It doesn't play the same music every Monday.) It's based on the *date*. Creature has five main play tunes, and for a three ball game chooses three of them. It divides the date by five, takes the remainder, and that's the starting song for ball 1. Next ball, the next song in the list is chosen, etc. So what's played on ball 2 today will be played on ball 1 tomorrow, until the cycle repeats every *five* days. ..."
Cheers
Ingo
Quoted from barakandl:The standby current of a the FM16W08 is in the data sheet and it was very small. What is unknown is the current needs of the RTC inside the asic chip.
Another thing is batteries, specially lithium ones, hold there voltage pretty stable and then drops like a rock when the battery is drained. These super caps voltage drops slow and steady as the capacitance of the super cap is drained. How the RTC behaves at 2.5v vs 4.5v is unknown (to me).
Quoted from Hawk007:Or you can install a lithium button cell to the asic to maintain the clock and there you go.
Nvram and lithium button cell and you have proper RTC and saved settings. The low power drain of just the RTC will make the button cell last and last like in a pc which almost never go.
That is unfortunately not completely correct. You cannot compare it with a PC-Motherboard.
The ASIC alone (without RAM) consumes 37,00 µA current when VBatt is 4,00 VDC.
A PC-motherboard consumes only 1,51µA when a 3-Volt-coin-cell is used; thats the reason, why coin cells there nearly live longer than the PC itsself.
Quoted from barakandl:... Drained down a fully charged 1f cap to below 2.4v in about 48 hours ...
maximum 48 hours
Quoted from barakandl:.... CR2032 would be lucky to last a year.
absolute maximum
Two 25F ultracaps should last longer, but too expensive.
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