Hi all,
I have a simple question, sometimes we have to return to the basics.
I designed a simple RC circuit for Reset. The MSP430 is assumed to drive the reset signal as shown in figure below.
I'm trying to qualify this signal, as follows the measurement I got using O-scope.
Based on the figure Above, I got :
1- so I'm understanding what element affects the discharge rate.
2- The RC time constant is approximately 10usec >> means that when the reset signal drived low (MSP GPIO output pin), the loop contains a RC circuit with C=100nF and R=100 Ohm.
The loop: GND >> [Diode with Resistor R] >> Capacitor >> GND
3- so for now I assume that100 Ohm resitor is considered as the dynamic resistor of the Diode. Iam I correct ?
or there is other thing to take in consideration.
A document studding the internal architecture of the MSP430 will be useful.
4- In other test, I changed the MSP430 by another MCU (ARM), The result was different in term of Time constant (I got 6uF).
Not a big difference, but I'm trying to understand :-)
Thanks.