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.

[Colin55]

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

I added & _BODEN_OFF to __CONFIG and reduced the current from 120uA to 5uA

[AvionicsMaster1]

Just looking at your code and decided to ask a question or two.

Why do you set the same configs twice? I think either will accomplish the task but they may be contradictory also.

Why are some configs spelled differently from one to the other? PWRT/PWRTE, INTRC_OSC_NOCLOCKOUT/INTOSC_OSC_NOCLKOUT and MCLR/MCLRE are the ones I see as different.

[HenrikOlsson]

Hi,

Just looking at your code and decided to ask a question or two

Which code is that exactly? I'm sort of guessing here so if I'm referring to the wrong one please disregard this.

Why do you set the same configs twice?

The only code in this thread, which could be interpreted as if that's happening is in the third post, by Archangel, but he's not setting the same config twice. One set is commented out:

;@ 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

Why are some configs spelled differently from one to the other? PWRT/PWRTE, INTRC_OSC_NOCLOCKOUT/INTOSC_OSC_NOCLKOUT and MCLR/MCLRE are the ones I see as different.

My guess is that one set (the ones that are commented out) is/was targeting the now obsolete PM-assembler which came bundled with PBP while the other is for Microchips MPASM assembler.

/Henrik.

[AvionicsMaster1]

My bad. I sincerely apologize for any confusion I might have generated. In the future I'll cut and paste the code to which what I refer to eliminate any obfuscation.

Sorry for using your time but thanks for a possible explanation and pointing out my error.