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Will the new real-time-clock in the LPC213x be able to wake the CPU from power down mode? I hope this is the case since it has external power and an external crystal...otherwise, the 2130 will continue to be a poor candidate for power-down operation as it will require an expensive external RTC making other ARM7s a better choice for low-power applications requiring periodic wakeup. |
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LPC213x - new RTC wake from power down?
Started by ●December 15, 2004
Reply by ●December 15, 20042004-12-15
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Hello Dave, yes, the RTC on LPC213x microcontroller will be able to wake up the part from power down mode. A bit in Interrupt Wakeup Register is added that enables this feature. Regards, Philips_apps --- In , "dave_albert" <david_albert@h...> wrote: > > Will the new real-time-clock in the LPC213x be able to wake the CPU > from power down mode? I hope this is the case since it has external > power and an external crystal...otherwise, the 2130 will continue to > be a poor candidate for power-down operation as it will require an > expensive external RTC making other ARM7s a better choice for > low-power applications requiring periodic wakeup. |
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Reply by ●December 15, 20042004-12-15
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I almost forgot, the AT91M55800A even has pins on the RTC to allow it to control a power supply enable pin to turn the power on and off to the rest of the board including this CPU! They were using their noodle on this one. |
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Reply by ●December 15, 20042004-12-15
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Go Philips!!!! Thanks! --- In , "philips_apps" <philips_apps@y...> wrote: > > Hello Dave, > > yes, the RTC on LPC213x microcontroller will be able to wake up the > part from power down mode. A bit in Interrupt Wakeup Register is > added that enables this feature. > > Regards, > > Philips_apps > --- In , "dave_albert" <david_albert@h...> > wrote: > > > > Will the new real-time-clock in the LPC213x be able to wake the CPU > > from power down mode? I hope this is the case since it has > external > > power and an external crystal...otherwise, the 2130 will continue > to > > be a poor candidate for power-down operation as it will require an > > expensive external RTC making other ARM7s a better choice for > > low-power applications requiring periodic wakeup. |
Reply by ●December 15, 20042004-12-15
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Yes, but it is big and BGA and $$$s --- In , "Rick Collins" <OKI-ARM-mcus@a...> wrote: > > I almost forgot, the AT91M55800A even has pins on the RTC to allow it > to control a power supply enable pin to turn the power on and off to > the rest of the board including this CPU! They were using their > noodle on this one. |
Reply by ●December 15, 20042004-12-15
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--- In , "philips_apps" <philips_apps@y...> wrote: > > Hello Dave, > > yes, the RTC on LPC213x microcontroller will be able to wake up the > part from power down mode. A bit in Interrupt Wakeup Register is > added that enables this feature. I took a look at the data sheet and it appears that this part also has a separate power supply for the RTC from the rest of the chip. This is *very* interesting. The data sheet does not have a value or even a label for the Ibat current. Is there any sort of a number for this? Will it be comparable to the RTC chips of <2 uA? Also, I have seen MCUs (not Philips) that are rated for industrial temps, but can not be stored above 85C due to the Flash losing its data. Is this a consideration for the LPC213x? Or can it be stored with power removed up to the spec value of 125C without speeding the loss of data in flash? Finally, where can I get price and delivery on these parts? They don't seem to be available anywhere yet. Is this a viable part for a new design going to board layout in the next month or so? |
