Thanks Steve for the reply. This is a very helpful information.
If the MCU goes to LPM3 when only a timer is runnning then it also goes into different LPMs (LPM0-LPM4) depending on what devices are running like the sensor and then the flash storage being written, etc. Which LPM does the MCU goes into when these devices turn on and then off discretely after doing the needful? Is there any documentation on it as TEP 112 on MCU power management is void of this information. Regards Mayur On 4/6/07, Steve McKown <[EMAIL PROTECTED]> wrote:
Hi, I can answer one of your questions. The msp430 goes to LPM3 (low power mode 3) in this case, which consumes about 1.1uA. The timer driven by the 32kHz crystal remains active so the msp430 can be awakened by a timer like TimerMilliC() being fired. On Friday 06 April 2007 07:41, Mayur Maheshwari wrote: > Hi All, > > I have few questions relating to the power management being done in TinyOS > 2.x > > 1. While perusing through the mails on the list it seems that the MCU > (Atmega128L or MSP430) sleeps if there are no tasks in the task queue. > However, my application uses a timer to periodically sense data and storing > it. This means that there is always a timer running. Does the MCU still > goes to any of the low power modes when there is no task in the queue > except the timer is running. > > 2. What is the energy requirement of the radio in the Low Power Listening > mode on a cc2420 radio? I read this while David Moss was implementing the > LPL scheme: > http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2006-September/01 >9365.html . Is > it 5.09mAh/day for a 2 sec receive check or lesser? > > 3. Does the radio draw less current when it wakes up and checks for the > channel being modulated in the LPL state. I guess it should be less than 8 > mA which it consumes in the actual Rx mode. > > Regards
-- Mayur Maheshwari([EMAIL PROTECTED]) "Karmanye Vadhikaraste Ma Phaleshu Kadachana, Ma Karma Phala Hetur Bhurmatey Sangostva Akarmani"
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