motors browning out PIC

[Charles Linquis]

That is why the approach I have suggested (Schottky diode and capacitor) works. The motors can pull the power supply to zero volts for a very short time, and the PIC keeps on running due to the energy stored in the capacitor.

I had an application where the power supply dropped to under 0.5V for 10 milliseconds. After I added the diode and the caps, the circuit worked perfectly.

[sayzer]

Hi Mike,

In that case, use these settings if you can and remove MCLR resistor;
and if you can, use internal OSC.

@ DEVICE PIC16F628A, INTRC_OSC
@ DEVICE PIC16F628A, MCLR_OFF
@ DEVICE PIC16F628A, WDT_OFF
@ DEVICE PIC16F628A, PROTECT_OFF
@ DEVICE PIC16F628A, BOD_OFF
@ DEVICE PIC16F628A, CPD_OFF

and, as Charles said, use a cap.


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