i always add a reset button in my projects since usually my program dont run correct when the power first enabled unless i press it.
so does anyone know a simple circuit to do reset(provide high volt to reset pin) when the power first enabled and then provide 0 volt after short time?
There are many of these circuits on the market, but I would suggest to you the DS1232 from MAXIM/DALLAS (free samples available). It provides H and L active resets and allows you still to use external reset button.
INfo on this chip you can find here: **broken link removed**
so does anyone know a simple circuit to do reset, provide high volt to reset pin when the power first enabled and then provide 0 volt after short time?
Hi
Plz tell to me What you machine(8051,avr,pic,....)
but I think that your power supplay is not good and have large time constant.
you can use one cap one diode and one resistor:
Hi
Plz tell to me What you machine(8051,avr,pic,....)
but I think that your power supplay is not good and have large time constant.
you can use one cap one diode and one resistor:
I think mr. wolfheart wants the other way around, i mean the RST pin is active HIGH and normally LOW for normal operation. To do this, simply reverse it, Vcc becomes gnd, and gnd becomes vcc, except for the diode.
CMIIW
You should put a capacitor between VCC and RESET nodes, and a resistor between RESET and GND nodes. The cap & res' value can be various, depends on the reset timing which specified in the controller's datasheet.
Please, no more RC reset circuits in this world! They misfire too easily.
Instead, use an inexpensive power-up reset chip, like the ones mentioned above.