12F675 Sleep problem.. Standby current 80uA??

[LuisF]

Hi All!
I have tried to sleep to the PIC12F675, because my application needs it
but the current is 80uA and not 1nA like it says the data sheet.
This is the program that i use.
Where is the error?
That I forget to turn off?

Thanks for any help.

#include <12F675.h>
#device adc=8
#use delay(clock=4000000)
#fuses INTRC_IO,NOWDT,NOPUT,NOBROWNOUT,NOPROTECT,NOMCLR,NOCPD

void main()
{

setup_adc_ports(0);
setup_adc(ADC_OFF);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

OUTPUT_HIGH(PIN_A0);
DELAY_MS(500);
OUTPUT_LOW(PIN_A0);

WHILE(TRUE){
SLEEP();
}

}


For PIC 16F628 and PIC16F84 working fine and these are the programs.

#include <16F628.h>
#use delay(clock=4000000)
#fuses INTRC_IO, NOPROTECT,NOWDT,NOPUT,NOLVP,NOBROWNOUT,NOPROTECT,NOMCLR,NOCPD
void main()
{
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

OUTPUT_HIGH(PIN_A1);
DELAY_MS(1000);
OUTPUT_LOW(PIN_A1);
WHILE(TRUE){
SLEEP();
}
}


#include <16F84A.h>
#use delay(clock=4000000)
#fuses XT,NOWDT,NOPROTECT

void main()
{
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);

output_high(pin_A1);
delay_ms(1000);
output_low(pin_A1);

while(True){
sleep();
}
}

[Ttelmah]

[Guest]

[Felix Althaus]

Hi

I see two possible points for current reduction:

1) why do you use RTCC_INTERNAL? Use EXTERNAL and pull the T0CK pin low, so you don't have any changes in the tmr0 register

2) as default, all pins are inputs and there can be any voltage on open pins, causing them to draw "very much" current. Try to set all pins as outputs and set them low.


Perhaps this helps...

mfg
Felix