4pyros 0 Posted December 17, 2011 Share Posted December 17, 2011 I want to make some precision timers using the LaunchPad. Is there a way to find out how long it takes the LaunchPad with a MSP430G2211 to power up from a cold start? Thanks Andy Quote Link to post Share on other sites
ike 53 Posted December 17, 2011 Share Posted December 17, 2011 MSP430G2211 consume so little energy in LP mode, there is no need to turn it off. And to answer your question: It depends of value of your bypass caps and internal resistance of your power supply(battery). Quote Link to post Share on other sites
RobG 1,892 Posted December 17, 2011 Share Posted December 17, 2011 If you use internal clock it's close to nothing. See data sheet for specifics. Quote Link to post Share on other sites
4pyros 0 Posted December 17, 2011 Author Share Posted December 17, 2011 MSP430G2211 consume so little energy in LP mode, there is no need to turn it off.And to answer your question: It depends of value of your bypass caps and internal resistance of your power supply(battery). I want to power them up one after the other in a chain all runing off two wires a battery. Quote Link to post Share on other sites
4pyros 0 Posted December 17, 2011 Author Share Posted December 17, 2011 If you use internal clock it's close to nothing. See data sheet for specifics. I looked quick but did not see a power up time spec. What parameter would it be listed as? Quote Link to post Share on other sites
ike 53 Posted December 17, 2011 Share Posted December 17, 2011 I want to power them up one after the other in a chain all runing off two wires a battery. What will this device do? Quote Link to post Share on other sites
4pyros 0 Posted December 17, 2011 Author Share Posted December 17, 2011 I want to make some precision timers. like digital timing relays. The 1st one will get a trigger and after a short time send 12 VDC power down the line for the next and so on. The timing will be from .05 seconds to 1 or 2 seconds. Each timer will have two outputs one momentary to fire an E-match and the other output latching to send power to the next timer. I would like to do up to 50 timers in one chain but I need them all to be fairly accurate. Andy Quote Link to post Share on other sites
xmob 26 Posted December 18, 2011 Share Posted December 18, 2011 You're talking in .5 second(ish) increments. The startup time I would imaging to be in the order of microseconds. I don't think you need to worry unless timing really needs to be THAT precise. Quote Link to post Share on other sites
4pyros 0 Posted December 18, 2011 Author Share Posted December 18, 2011 You're talking in .5 second(ish) increments. The startup time I would imaging to be in the order of microseconds. I don't think you need to worry unless timing really needs to be THAT precise. No that would be .05 second increments and over 50 units. I need to come up with a spec time to get the money man (owner of the company) to buy into this idea. Quote Link to post Share on other sites
MattTheGeek 99 Posted December 18, 2011 Share Posted December 18, 2011 The MCU will start executing code in no less than 5uS (Using DCO) i believe. You can disable the emulator logic if needed and provide a separate power supply to bypass the power ramping. Wakeup from standby seems to be faster, "Ultra-Fast Wake-Up From Standby Mode in <1 ?s". 4pyros 1 Quote Link to post Share on other sites
4pyros 0 Posted December 18, 2011 Author Share Posted December 18, 2011 Thanks Matt; That is helpfull. What Is DCO? Quote Link to post Share on other sites
gordon 229 Posted December 18, 2011 Share Posted December 18, 2011 What Is DCO? Pretty good time to start reading [tipdf]SLAU144[/tipdf]. 4pyros 1 Quote Link to post Share on other sites
4pyros 0 Posted December 18, 2011 Author Share Posted December 18, 2011 What Is DCO? Pretty good time to start reading [tipdf]SLAU144[/tipdf]. Thanks, That is a lot of reading but I now know what DCO is. Quote Link to post Share on other sites
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