I want to use a Cypress POSC4 product to do an amp sense without a sense resistor.
Using the on board op amp to amplify the volt drop and the ADC to measure the voltage.
The sense is to prevent the load from over current
+12v - PnP Mosfet(RDSon .0024 ohm) - Brushed DC Motor (2 ohm) - ground
Mosfet is used a switch 12v off and 0v on
I will ignore the Start up current until the motor has time to spin up with load then measure the voltage drop across the either the motor or the mosfet.
The motor runs until it loads to 3 amps and then the motor is turned off
The motor is pushing a ram when the ram contacts and immovable object the motor amps goes up
The motor is rated to 5.5 amps for 15 seconds before it gets hot enough to damage it
The sense circuit will be through a 10k resistor with enough (capacitance to ground) to absorb back emf to clean up the signal
Is there any reason this approach won’t work?