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Technical sales support for product selection... Low Power Consumption - Watchdog IC

Aldo DiVirgilio
Prodigy 40 points
Other Parts Discussed in Thread: LMC567

 I believe I'm seeking a Watchdog IC that will monitor an A/C input and when certain voltage threshold is received (500mV, 1V?) the IC will provide line power (DC) voltage to the rest of my circuit via the circuit's power rail.   Any help or point in the right direction would be greatly appreciated! :)

  • 0
    Prodigy 5 points
    Hello Aldo, I have a few questions to better route your inquiry.

    1. monitor an A/C input and when certain voltage threshold is received (500mV, 1V?)
    -what voltage? 24VAC, 240VAC?
    -is there a supply source for this opamp to work from?

    2. the IC will provide line power (DC) voltage to the rest of my circuit via the circuit's power rail
    -is this just a switch to an existing DC voltage?
    -is the IC expected to create this DC voltage
    -what voltage, current, power is involved?

    Any other details would be helpful.

    Thank you.
  • 0 in reply to Ed Walker
    Prodigy 40 points

    Thank you for your response... please see my annotations below:

    Design:   This circuit is seeking to "listen" for a specific frequency via a microphone, and when the frequency is detected, turn an output pin on HIGH... I'm using a LM567 IC, however, this IC uses too much current to effectively run on battery full time.   Therefore, I'm seeking another IC that will provide power to the LM567 ONLY when sound is being picked up by the microphone.   The power rail will be powered by either 2 AA batteries or a lithium battery.   The microphone generates a sine wave of +/-200mV - +/- 500mV at the DB / amplitude expected (when viewed via an oscilloscope)... and would be input to the IC i'm seeking.

    1. monitor an A/C input and when certain voltage threshold is received (500mV, 1V?)
    -what voltage? 24VAC, 240VAC?.... (Very low voltage... the source is an Electret microphone for which my circuit uses the LM567 to drive an output HIGH when a certain frequency is picked up on the microphone)
    -is there a supply source for this opamp to work from?

    2. the IC will provide line power (DC) voltage to the rest of my circuit via the circuit's power rail
    -is this just a switch to an existing DC voltage? Yes, I'm still designing  the power aspect of the circuit, but I believe I will be in the 2.2 to 5V range on the power rail.
    -is the IC expected to create this DC voltage (No, its a switch that should be actuated when voltage is detected on the input (programmable would be best)
    -what voltage, current, power is involved?  (TTl levels, using an oscilloscope, microphone generates sine wave of approx +/-200mV - +/- 500mV at the DB / amplitude expected. 

    Any other details would be helpful.

  • 0 in reply to Aldo DiVirgilio
    Prodigy 5 points

    Aldo, 
    Have you seen the LMC567? Low Power Tone Decoder

    Supply current is 500uA typical at 5V, 300uA at 2V.
    LM567 current is 7mA typical at 5V, LM567 will not work below 4.75V

    LMC567 is 2V to 9V supply range.
    LM567 is 4.75 to 9V.

    Have you considered using an MSP430 micro controller?

    A Robust Glass-Breakage Detector Reference Design - TIDM-GBD-ROBUST - TI Tool Folder
    50uA average current during monitor.

    A Simple Glass-Breakage Detector Reference Design - TIDM-GBD-SIMPLE - TI Tool Folder
    50uA average current during monitor.

    The sound algorithm is modifiable for your needs.
    The uC could do many other functions.

  • 0 in reply to Ed Walker
    Prodigy 60 points

    My email address is .(deleted).com. I once bought the control device and sensor set more than 1 month ago. But I never get my order. Can you help me to check it?

    Thanks

    Li