Smart devices ensures inadvertent short reset push-button closures do not cause resets
RS Components now stocks the STMicroelectronics SR2HARU, a smart reset
devices which provide a useful feature that ensures inadvertent short reset
push-button closures do not cause system resets. This is done by
implementing extended Smart Reset input delay time (tSRC) and combined
push-button inputs, which together ensures a safe reset and eliminates the
need for a specific dedicated reset button. This reset configuration
provides versatility and allows the application to distinguish between a
software generated interrupt and a hard system reset.
When the input pushbutton are connected to microcontroller interrupt
inputs, and are closed for a short time, the processor can only be
interrupted. If the system still does not respond properly, continuing to
keep the push-button closed for the extended setup time tSRC causes a hard
reset of the processor through the reset output.