Hello everyone,
First post here, forum looks good !
Ok so the context:
I am trying to find the simplest way to reset an NRF52 MCU using a DS3231 RTC after a deep sleep period (very low energy application).
So far I managed to do just that with a simple N channel MOSFET between the alarm pin of the RTC and the enable pin of the MCU. But this method is no longer acceptable since suddenly cutting the power supply of the MCU causes various software problems (huge surprise right ?).
So now I'm trying to use a more classic approach: the MCU sets up an RTC alarm, goes to sleep, then some time later, the RTC triggers an MCU reset (RST pin), the MCU wakes up, and so on.
The alarm pin goes from high to low when triggered and the opposite when the alarm is cleared by the MCU. The MCU resets on a rising edge of the RST pin. It is deactivated when RST is at a low level. The voltage supply is 3.3V and the solution must have low energy needs.
I've tested the 555 IC which everyone knows for this application, it's "kind of" working but it's not 3.3V compatible, and the output logic is the opposite of what I need (goes high on rising edge input).
I need something like an LTC6993-3 from Analog:
This would be perfect if it wasn't only available in a SOT23 package. I am capable of hand soldering SOT23 but it's far from optimal since I'd have to do something like 20 of them...
Do you guys know of any equivalent IC available in DIP ? Or any alternate solution (it must not include too much components).
Thanks and have a good day
First post here, forum looks good !
Ok so the context:
I am trying to find the simplest way to reset an NRF52 MCU using a DS3231 RTC after a deep sleep period (very low energy application).
So far I managed to do just that with a simple N channel MOSFET between the alarm pin of the RTC and the enable pin of the MCU. But this method is no longer acceptable since suddenly cutting the power supply of the MCU causes various software problems (huge surprise right ?).
So now I'm trying to use a more classic approach: the MCU sets up an RTC alarm, goes to sleep, then some time later, the RTC triggers an MCU reset (RST pin), the MCU wakes up, and so on.
The alarm pin goes from high to low when triggered and the opposite when the alarm is cleared by the MCU. The MCU resets on a rising edge of the RST pin. It is deactivated when RST is at a low level. The voltage supply is 3.3V and the solution must have low energy needs.
I've tested the 555 IC which everyone knows for this application, it's "kind of" working but it's not 3.3V compatible, and the output logic is the opposite of what I need (goes high on rising edge input).
I need something like an LTC6993-3 from Analog:
This would be perfect if it wasn't only available in a SOT23 package. I am capable of hand soldering SOT23 but it's far from optimal since I'd have to do something like 20 of them...
Do you guys know of any equivalent IC available in DIP ? Or any alternate solution (it must not include too much components).
Thanks and have a good day