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2005-12-30 by jlowryspectrum
My last project used an LPC2138. My next project is battery powered and must be able to sleep then wake up each hour. From reading various posts it looks like the LPC takes about 60-70uA when operating in deep sleep with RTC enabled. Anyone have experience with MSP430. First glance thru their docs indicate when in LPM3 (interrupts and timer enabled) it draws 2uA. Is there something else I should be aware? Jeff.
2005-12-30 by Joel Winarske
> My last project used an LPC2138. My next project is battery powered > and must be able to sleep then wake up each hour. From reading various > posts it looks like the LPC takes about 60-70uA when operating in deep > sleep with RTC enabled. LPC213x data sheet excerpt: IBAT // Power-down mode supply current // VBAT RTC clock = 32 kHz (from RTXC pins), Ta = +25 °C VDD = 3.0 V, VBAT = 2.5 V - 14 - mA VDD = 3.0 V, VBAT = 3.0 V - 16 - mA VDD = 3.3 V, VBAT = 3.3 V - 18 - mA VDD = 3.6 V, VBAT = 3.6 V - 20 - mA You should be able to take advantage of this with a scheme like this: 1. Use RTC to generate desired hourly alarm interrupt 2. Set RTCWAKE bit in INTWAKE to enable alarm wake up 3. Power down part via PD bit in PCON Perhaps there is variation in this for the LPC214x and the LPC2101/2/3. Joel
2005-12-30 by jlowryspectrum
Thanks Joel for the reference. You actually mean uA rather than mA. I got the 60-70uA from "LPC213xpower.pdf" in the "files" area of this group. Jeff. --- In lpc2000@yahoogroups.com, "Joel Winarske" <joelw@i...> wrote: > > > My last project used an LPC2138. My next project is battery powered > > and must be able to sleep then wake up each hour. From reading various > > posts it looks like the LPC takes about 60-70uA when operating in deep > > sleep with RTC enabled. > > LPC213x data sheet excerpt: > IBAT // Power-down mode supply current // VBAT > RTC clock = 32 kHz (from RTXC pins), Ta = +25 °C > VDD = 3.0 V, VBAT = 2.5 V - 14 - mA > VDD = 3.0 V, VBAT = 3.0 V - 16 - mA > VDD = 3.3 V, VBAT = 3.3 V - 18 - mA > VDD = 3.6 V, VBAT = 3.6 V - 20 - mA > > You should be able to take advantage of this with a scheme like this: > 1. Use RTC to generate desired hourly alarm interrupt > 2. Set RTCWAKE bit in INTWAKE to enable alarm wake up > 3. Power down part via PD bit in PCON > > Perhaps there is variation in this for the LPC214x and the LPC2101/2/3.
> > > Joel >
2005-12-30 by lpc2100_fan
Hi, the difference is that 60-70 uAs is power down, keeping all the information of the registers and 32k SRAM intact while the lower values is RTC only from Vbat and the information from SRAM and registers is lost but usually you can save the stuff into the Flash. Now about MSP430 or LPC2138, well if you can deal with 62k Flash, 2K SRAM and a max of 16 MHz which afaik is the max. configuration you can get on a MSP430 today, then it is lower power in power down. You will probably pay a similar price for for much lower performance and 1/8 of the memory device. So in a nutshell, you get a lot more for your money using the LPC2138 but the MSP430 has low power modes being most of the time not active that are lower than those of the LPCs. Hope this helps, Bob --- In lpc2000@yahoogroups.com, "jlowryspectrum" <jlowry@s...> wrote:
> > My last project used an LPC2138. My next project is battery powered > and must be able to sleep then wake up each hour. From reading various > posts it looks like the LPC takes about 60-70uA when operating in deep > sleep with RTC enabled. > > Anyone have experience with MSP430. First glance thru their docs > indicate when in LPM3 (interrupts and timer enabled) it draws 2uA. Is > there something else I should be aware? > > Jeff. >
2005-12-30 by Joel Winarske
> Thanks Joel for the reference. You actually mean uA rather than mA. > I got the 60-70uA from "LPC213xpower.pdf" in the "files" area of this > group. Jeff. Yes thanks for the correction. I copied direct from pdf into Word, without confirming the pasted data. Corrected Table: LPC213x data sheet excerpt: IBAT // Power-down mode supply current // VBAT RTC clock = 32 kHz (from RTXC pins), Ta = +25 °C VDD = 3.0 V, VBAT = 2.5 V - 14 - uA VDD = 3.0 V, VBAT = 3.0 V - 16 - uA VDD = 3.3 V, VBAT = 3.3 V - 18 - uA VDD = 3.6 V, VBAT = 3.6 V - 20 - uA Joel
2005-12-30 by mucko
Hi,, MSP430 family has really good at lower power modes,.I have experinced with this family and used msp430f4xx family of controllers in a metering application projects.I can say the chip while working cpu clock of 8 mhz,125 nsec.,it draws only 5 uA even lcd is on, and also all interrupts active! this gives the greatest battery life! regards, --- jlowryspectrum <jlowry@...> wrote: > My last project used an LPC2138. My next project is > battery powered > and must be able to sleep then wake up each hour. > From reading various > posts it looks like the LPC takes about 60-70uA when > operating in deep > sleep with RTC enabled. > > Anyone have experience with MSP430. First glance > thru their docs > indicate when in LPM3 (interrupts and timer enabled) > it draws 2uA. Is > there something else I should be aware? > > Jeff. > > > > > __________________________________________ Yahoo! DSL \ufffd Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com
2005-12-31 by Mr shyam_Gopal Mishra
yes i m fully agried with mr mukadder .....its true msp430 series is the ideally targeted for lowpower & battery driven applications..... rgds Shyam --- mucko <mukadder_c@...> wrote: > Hi,, > MSP430 family has really good at lower power > modes,.I > have experinced with this family and used msp430f4xx > family of controllers in a metering application > projects.I can say the chip while working cpu clock > of > 8 mhz,125 nsec.,it draws only 5 uA even lcd is on, > and > also all interrupts active! > > this gives the greatest battery life! > > regards, > > --- jlowryspectrum <jlowry@...> > wrote: > > > My last project used an LPC2138. My next project > is > > battery powered > > and must be able to sleep then wake up each hour. > > From reading various > > posts it looks like the LPC takes about 60-70uA > when > > operating in deep > > sleep with RTC enabled. > > > > Anyone have experience with MSP430. First glance > > thru their docs > > indicate when in LPM3 (interrupts and timer > enabled) > > it draws 2uA. Is > > there something else I should be aware? > > > > Jeff. > > > > > > > > > > > > > > > __________________________________________ > Yahoo! DSL \ufffd Something to write home about. > Just $16.99/mo. or less. > dsl.yahoo.com > > __________________________________________ Yahoo! DSL \ufffd Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com
2006-01-02 by Mauricio Scaff
Yes... If you need really low power, go to MSP430. I have a MSP430F413 counting time, waking every second using about 1.8uA. jlowryspectrum wrote: > My last project used an LPC2138. My next project is battery powered > and must be able to sleep then wake up each hour. From reading various > posts it looks like the LPC takes about 60-70uA when operating in deep > sleep with RTC enabled. > > Anyone have experience with MSP430. First glance thru their docs > indicate when in LPM3 (interrupts and timer enabled) it draws 2uA. Is > there something else I should be aware? > > Jeff. > > > > > > > SPONSORED LINKS > Microprocessor > <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-J9hJ5qyXg0WPR0l6g> > Microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq01nxwg> > Pic microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c6LyBvUqVQ> > > 8051 microprocessor > <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVIlekkDP-A> > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "lpc2000 > <http://groups.yahoo.com/group/lpc2000>" on the web. > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ > [Non-text portions of this message have been removed]