I am wondering what is the purpose of an IC such as the MC34064. Is it just to ensure a reset of microcontrollers upon power up or are there other reasons? I used to make a simple transistor switching circuit (with RC) for resetting microcontrollers in the old days. I am asking because the name of this IC is "undervoltage sensing" and not "reset IC" or something similar.
Electronic – purpose of an Undervoltage Sensing Circuit
sensingundervoltage
Related Solutions
According to your description, something like this should work:
The TLV3012 has the reference voltage built-in, so that's 1 6-pin IC, 1 FET, and 2 resistors. Not sure if you consider that "simple". :)
Similar:
Using a pMOS to switch a load is summarized here.
You could probably use a Zener as the reference for the comparator, too, or maybe rig something up to drive the MOSFET from the Zener more directly, but I don't know how precise that would be.
An electrical machine will draw what current is required to satisfy the load (P =Tw)
For light load a reduction in terminal voltage will not really affect the output shaft performance.
However... With increased load and reduced voltage the rotor velocity will drop while the shaft load torque is opposed.
At some point the electrical machine will stall or fail to breakout if at rest
Best Answer
I guess you are trying to understand why you need an IC to do what a simple transistor could do "in the old days", which is pulling a reset pin low (or high), right? If that's the case, a couple of reasons are:
The trigger point can be precisely set, as the IC has its internal bandgap reference voltage. With a simple transistor, it's harder to trigger at a very specific value reliably.
You can set a specific time for the reset pin to stay low when it's triggered (which is harder to do with simple transistors). Many ICs have strict requirements with minimum reset assertion time.
This type of ICs usually operates down to low voltages (in this case 1V) guaranteeing that it will work reliably for large voltage drops on the power rail.
The fact that they label it as UV sense instead of IC reset doesn't really matter as they clearly describe the purpose that this IC has been designed for, which is to reset a microprocessor.