对于可以睡眠并被计时器唤醒的低功耗XLP？PIC有哪些选择？

大多数人都可以被看门狗计时器唤醒，但不超过24小时。您可以使用外部RTC。



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    Most can be woken up by the Watchdog timer.
Not as long as 24 hours, however.  
You could use and external RTC.

谢谢你的回复，我不需要每24小时醒来一次。我可以每隔几分钟醒来递增一个变量，然后在24小时过去之后最终执行我的操作。这似乎可行，不是吗？外部RTC似乎过量了，我不需要整个日历，只需要做低功耗的定期维护。或者我想错了。



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Thank you for your response.
 
I don't need to wake every 24 hours. I can wake every few minute to increment a variable, and then ultimately perform my action after 24 hours have passed. That seems feasible, no?
 
external RTC seems excessive, I don't need an entire calendar, just need to do periodic maintenance at low power. Or maybe i'm thinking about it wrong.

也许几秒钟。最简单的方法是使用WDT。然而，它也会消耗一些能量。你可以从数据表中得到确切的数字。



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Few seconds perhaps. The easiest way is to use WDT. However, it will consume some energy too. You can get the exact number from the datasheet.

你没有错误的想法，我只是不知道你的目标。WDT不太准确。因此，对于需要准确性的应用程序来说，这将是不好的。



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    You are not thinking wrong I just do not know your goals.  The WDT is not very accurate.  so it would not be good for an application that needs accuracy.

准确度不是必须的，只是需要每天大约做一次，以最小的功耗。



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    Accuracy is not necessary, just need to do something roughly once a day, with minimal power dissipation.

嗨，一个解决方案是使用PIC24FJ设备与RTCC（他们大多数有这个）。RTCC单元可以从32kHz驱动，你可以设置一个相对的唤醒，例如1mn，1HR，1天，1周，1个月后。因此，在睡觉之前，将闹钟设置为从现在开始的1天，CPU将在1天后醒来；=）另一种可能性是使用CIP（核心独立外围设备通过级联几个定时器来构建“超级”定时器。例如SMT是一个24位定时器。一些8位图片有2个。如果使用CLC级联，则具有2^48分频器，并使用32kHzXTAL的内部看门狗作为时钟，应该能够达到高持续时间。要找到有2个SMT，CLC的图片，只要使用这个BreCurrEGARDS



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    Hi,
One solution would be to use a PIC24FJ device with RTCC (most of them have this).
RTCC unit can be driven from a 32kHz and you can setup a relative  e.g wake up in 1mn, 1HR, 1day, 1 week , 1month from now. So before to go to sleep you setup the alarm to 1 day from now and the CPU will wake up 1 day later ;=)
Another possibility is to use the CIP (Core Independant Peripherals to build a "super" timer by cascading several timers. e.g. the SMT is a 24 bits timer. Some 8bits PICs have 2 of them. If you cascade them using CLC you have 2^48 divider and use the internal watchdog of a 32kHz XTAL as clock you should be able to reach high durations. To find the PICs which have 2 SMT, CLC,...just use this brochure 
Regards

不考虑外部解决方案，在LPRC（LFINTOSC）上运行的WDT将消耗掉东部的功率。如果要使用计时器，请小心。他们中的大多数人会停止睡觉。



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    Not counting external solutions, WDT running on LPRC (LFINTOSC) will consume the least power.
 
If you want to use timers, be careful. Most of them will stop in sleep.

谢谢您！非常非常有用。我把CIP视为一种选择。你知道你提到的想法的成本/功率权衡吗？



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thank you! very very helpful.  I was looking at CIP as an option.
 
Any idea what the cost/power tradeoffs are with the ideas you mentioned?