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TPS3422: TPS3422 with tactile switch to power ON the system, without using microcontroller

TapasXplore
Expert 1280 points
Part Number: TPS3422

Hello,


I am planning to use tactile switch to turn ON and turn OFF a circuit. I am planning to use TPS3422 to power ON and OFF the system. Can TPS3420 be used without micro-controller. After reading the datasheet, we can see there is one pin RST(invert) which is directly connected to reset of the controller. In my application microcontroller is not being used.

Regards,
Tapas

  • 0
    TI__Genius 12630 points
    Tapas,

    The TPS3422 can connect to pretty much anything including microcontrollers to read the output or LEDs see if the output is high or low or to switches or to other devices to disable them. The only requirement is there needs to be a pull-up resistor at the RST pin because the output topology is open-drain. You do not need to use a microcontroller.

    Does this answer your question? If you need additional support please let me know. Thank you!

    -Michael
  • 0 in reply to Michael_DeSando
    Expert 1280 points

    Hi Michael,

    Our application require following kind of setup, in which push button should turn ON-OFF a circuit by enabling dc-dc converter. (Pic shown below). Is it possible to do it using TPS3422 or TI has some specific IC for this kind of application.  

                                                                                                                   Fig.1

  • 0 in reply to TapasXplore
    TI__Genius 12630 points
    Tapas,

    That is perfect! My question is what timing are you trying to achieve? Do you want the push-button to disable the DC/DC converter right away when button is pressed? Or do you want push-button to disable DC/DC converter after a long button press like 7 seconds long?

    When the button is pressed, do you want the DC/DC converter to stay off as long as the button is pushed down? Or do you want the DC/DC converter to stay off for a fixed amount of time?

    The answers to these questions will determine if you need to switch the device you chose. As it is right now, when you push the button (either right away or after 7.5 seconds since both options are available for TPS3422), the output will go low for a fixed 400 ms. This means if the "Enable" of the DC/DC is normally high during operation, then the push button will cause the DC/DC to turn off for 400ms when the button is pressed.

    -Michael