motors browning out PIC

[mbw123]

Sorry for the late response.

What is BOD?

I don't need the MCLR, so I can probably turn it off. Won't the power be drawn from the PIC and restart it anyway? I mean, if there is no power to the PIC when the motors turn on, will it restart? Or the motors will not draw all the current?

Thank you very much for the responses.

-Mike

[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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