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Unexpected Brown out reset in dsPIC33

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prodigyaj

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dspic33 reset

I am running a dsPIC33FJ32MC304 at 79-80MHz using the internal oscillator with PLL.

The controller is driving a pair of brushed DC motors under PID control through some motor-driving circuitry. Occasionally, after the motors have reached their setpoint, the systems resets. I used the following code to turn on LEDs depending on the particular reset.

Code:
if(RCONbits.POR == 1)
   {
       _LATB4 = 0;                   //LED 1 cathode to RB4
       RCONbits.POR = 0;
   }
if(RCONbits.BOR == 1)
   {
       _LATB9 = 0;                   //LED 2 cathode to RB9
       RCONbits.BOR = 0;
   }
DELAY_MS(2000);                    //Delay for 2 seconds
LATB = 0xFFFF;                       //Turn off all LEDs



When I switch the system on for the first time, both LEDs glow, in accordance with the datasheet. However, whenever the system resets automatically, LED 2 glows which indicates a brown out reset.

I think the resaon for the reset is that the VDDCORE capacitor has a value of 1uF which is the minimum specified in the datasheet. Also, it is located around 2 cm away from the pins of the controller.

I am considering replacing the 1uF capacitor with a 10uF one, which I hope will give me more reliable performance. Is there anything else that I should really really look out for?[/code]
 

dspic 33f brown

can someone gimme the possible reasons for brown out resetting ? !!
 
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