High Power Consumption in Sleep Mode

[ngeronikolos]

Hello boys and girls,


I use for a first time sleep mode with my 16F627 pic after searching and reading to the forum.
I manage to send my pic to sleep mode and I can wake it up with interrupt on portb.0.


My problem is the big Consumption in sleep mode.It is about 370uA

That is my code:

@ DEVICE  PIC16F627, XT_OSC 
@ DEVICE pic16F627, WDT_OFF 
@ DEVICE pic16F627, PWRT_ON
@ DEVICE pic16F627, MCLR_OFF
@ DEVICE pic16F627, BOD_OFF 
@ DEVICE pic16F627, LVP_OFF 
@ DEVICE pic16F627, CPD_OFF 
@ DEVICE pic16F627, PROTECT_OFF
DEFINE  OSC 4
DEFINE NO_CLRWDT 1
                                                                                                                                                                                                                                                               
CMCON = 7  'Turn off comparators
VRCON=%01101100 'VRCON bit7 is OFF for no current drain
OPTION_REG.7 = 0 ' 1=DISABLE INTERNAL PULLUPS,0=ENABLE 

LED VAR PORTA.2

INTCON=%00010000 ' Interrupt Control Register
' 7=0 - GIE - Global Interrupt Enable
' 6=0 - PEIE - Peripheral Interrupt Enable
' 5=0 - TOIE - TMR0 Overflow Interrupt Enable
' 4=1 - INTE - RB0/INT Enable
' 3=1 - RBIE - PORTB change interrupt Enable
' 2=0 - TOIF - TMR0 Overflow Flag
' 1-0 - INTF - RB0/Ext Interrupt Flag
' 0=0 - RBIF - PORTB Interrupt Flag

OPTION_REG.6=1 ' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger

CYCLE:

INTCON.1=0 ' Reset RB0 Flag
INTCON.0=0 ' Reset PORTB change Flag

'
' Sleep
' -----
LOW LED

@ SLEEP
@ nop
@ nop
@ nop

Pause 100 ' Needed for system Wake-Up

HIGH LED 
    PAUSE 5000
    LOW LED
GOTO CYCLE

END

My hardwarev is simply a resistor from porta.2 with a Led to GND and XTL with 2capasitors.NOTHING MORE

Please advice
Nikos

[Archangel]

Hi Nikos,
Check this thread out, same problem, different chip.
http://www.picbasic.co.uk/forum/showthread.php?p=75528

[Archangel]

Hi Nikos,
using this code:

;@ DEVICE  PIC16F648A, INTRC_OSC_NOCLOCKOUT 
;@ DEVICE pic16F648A, WDT_OFF 
;@ DEVICE pic16F648A, PWRT_ON
;@ DEVICE pic16F648A, MCLR_OFF
;@ DEVICE pic16F648A, BOD_OFF 
;@ DEVICE pic16F648A, LVP_OFF 
;@ DEVICE pic16F648A, CPD_OFF 
;@ DEVICE pic16F648A, PROTECT_OFF
@ __CONFIG _INTOSC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _LVP_OFF & _BODEN_OFF & _BOREN_OFF
DEFINE  OSC 4
DEFINE NO_CLRWDT 1
PORTA=0
TrisA = 255
trisb = %00000001 'RB0 as  input                                                                                                                                                                                                                                                               
CMCON = 7        ' Turn off comparators
'VRCON = %01101100  ' VRCON bit7 is OFF for no current drain
OPTION_REG.7 = 1 ' 1=DISABLE INTERNAL PULLUPS,0=ENABLE 
OPTION_REG.6 = 1 ' 1=RB0 Rising-Edge Trigger, 0=Falling-Edge Trigger

LED VAR PORTA.2

INTCON = %11010000 ' Interrupt Control Register
                 ' 7=0 - GIE - Global Interrupt Enable
                 ' 6=0 - PEIE - Peripheral Interrupt Enable
                 ' 5=0 - TOIE - TMR0 Overflow Interrupt Enable
                 ' 4=1 - INTE - RB0/INT Enable
                 ' 3=1 - RBIE - PORTB change interrupt Enable
                 ' 2=0 - TOIF - TMR0 Overflow Flag
                 ' 1-0 - INTF - RB0/Ext Interrupt Flag
                 ' 0=0 - RBIF - PORTB Interrupt Flag


on interrupt goto cycle2
CYCLE:
LOW LED
'pause 500

@  SLEEP
;@ nop
;@ nop
;@ nop

disable


cycle2:
HIGH LED 
    PAUSE 500
    LOW LED
    PAUSE 500
INTCON = %11010000  

enable
GOTO CYCLE
end

Which is a derivitive of your code, I fought with the interrupt a bit.
By setting port a as all inputs the sleep current dropped from 3.71 ma to 0.12 ma
The 16F648A was as close a chip to yours as I have.

[ngeronikolos]

Thanks Joe for your code...

I have just test it with the same results.
The Consumption is still 0.37 ma or 370uA.

I do not understand what is wrong.The setup is the minimal it ca be...

[ngeronikolos]

I find it.....
Now it sleeps with the minimum current...just 0.1 ma or 100uA.

The pin MCLR was flatting and I add the 4.7k to Vcc.

Many Many thanks joe for your code.


Regards
Nikos

[Archangel]

I find it.....
Now it sleeps with the minimum current...just 0.1 ma or 100uA.

The pin MCLR was flatting and I add the 4.7k to Vcc.

Many Many thanks joe for your code.


Regards
Nikos

You are welcome. I had turned MCLRE off in my config.