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#1
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Wanted: RF Reciever IC with "Sleep" ability
I'm in Automated Home technologies - I need to install a reciever unit (RF -
FCC approved freq.) which will "lay low" and not tax the snot out of batteries. For example: Your RC cars which you purchase from WalMart - use a chip that quickly eats the batteries up. Cell Phones are polling the stations constantly and tax the batteries up., I need an IC that will LAY LOW / SLEEP - perhaps look every 1 second for a signal and STARTUP at that point. My unit is a simple 4.5V DC operated motor that I wish to trigger RIGHT/LEFT perhaps only once / month! My unit is to be installed and the batteries would be a major pain to replace - would destroy sales of unit. Cell phones (I would think) should seek this kind of technology - that is, only "peek" once in a while for the data and sleep the remainder of the time. But perhaps, Cell Phones have much more "to do" than my simple application. I am simply "opening and closing" a small door with a small DC motor. But my issue is that all the RF Reciever IC's I've investigated are BUZY BUZY - They eat up a pair of 'AA' batteries in 1 Month with conservative circuitry - that unaccacceptable for my applicaction. If anyone knows of an RF Reciever IC that has this "sleep" ability built in - it would be RADICALLY appreciated !!!!! What about simple pager units??? Are they "charge me charge me charge me"??? Why aren''t the engineers considering the "look occasionally for data/signal" condition instead of constantly looking at the freq: which they are triggered at? Best Regards to all Walt |
#2
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Investigate Microchip
http://www.microchip.com/stellent/id...PAGE&nodeId=74 about 3/4 the way down the page Paul |
#3
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I recently went through one IC with a "Sleep mode" which required an
EXTERNAL PULSE to trigger the sleep mode on/off. The *BIG* question is: How does "Stand By" become triggered off and on? - External pulse or through the reciever signal? If through the reciever signal - all is WAY GOOD , YES. If through some external pulse - then the "Stand By" mode becomes "senseless" in my mind because one could simply kill the VCC at that point. Do you know/understand how the "Stand by" mode is triggered off? From the description of Pin 28 in the PDF manual it states: Bias circuitry provides bandgap biasing and circuit shutdown capabilities. The ENRX (Pin 28) modes are summarized in Table 2-1. The ENRX pin is a CMOS compatible input and is internally pulled down to Vss. TABLE 2-1: BIAS CIRCUITRY CONTROL ENRX(1) Description 0 Standby mode 1 Receiver enabled Note 1: ENRX has internal pull-down to Vss It "appears" (I hope I'm wrong) that an external bias must be applied to Pin 28 to take the IC out of "Sleep mode". In which case - I fail to see its purpose. I need the IC to be "awaken" via an RF pulse or "trigger freq". Investigate Microchip http://www.microchip.com/stellent/id...PAGE&nodeId=74 about 3/4 the way down the page Paul |
#4
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Or - I could put a 555 timer on pin 28 and have it On every 1 second -
Hmmm...may work ey? "loedown" wrote in message ... Investigate Microchip http://www.microchip.com/stellent/id...PAGE&nodeId=74 about 3/4 the way down the page Paul |
#5
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NO - The timer eats too much Power and exhausts the batteries again.
"jack" wrote in message ... Or - I could put a 555 timer on pin 28 and have it On every 1 second - Hmmm...may work ey? "loedown" wrote in message ... Investigate Microchip http://www.microchip.com/stellent/id...PAGE&nodeId=74 about 3/4 the way down the page Paul |
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