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Pulse detection circuit

Other Parts Discussed in Thread: SN74AUP1G14

In one of my applications, I am looking for to convert a 25Hz 30% duty cycle 3.3V signal to logic high (or low) , the pin generating this pulses is otherwise High and generate pulses on a condition.

I am not able to find any specific IC /logic to do the same.

to be more precise I am using this Toshiba Magnetic sensor IC TCS40DLR which generates this pulse, I am keeping the Vout pin pulled up 

  • Hi Abhishek,

    I'm a little confused by your question. Are you wanting to take that 3.3V pulse and translate it up or down? Or are you wanting to know if we have a part similar to the TCS40DLR?
  • Hi Dylan,

    I am using the part  TCS40DLR and  can not change this part at this moment. I want to take the 3.3V pulse generated by Vout of this IC and translate it to a low signal with some interface circuit

    The circuit can be described as below:

    The Vcc is supplied as 3.3V, the Vout pin is pulled up by a 10k resistor , Vout is also  decoupled by a 0.47uF capacitor as recommended in the datasheet. This IC generates 3.3V pulses (25 Hz to 90 Hz) when it senses the magnetic field. I want to simplify the output generated from pulses to logic zero ( when not sensing it already gives a logic high due to pull up)

  • Hi Abhishek,

    To take a pulse at 3.3 V and turn it into a logic low, I would recommend an inverter. Since you have a big RC component the signal has to pass through, I would use this device SN74AUP1G14. It has a schmitt-trigger input which helps with slow edges, and it also operates at 3.3 V. Thanks.