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E_Blue
Joined: 13 Apr 2011
Posts: 417
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| Can't get PIC16F18326 in Low Power mode |
 Posted: Mon Jul 10, 2017 3:27 pm |
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I making a program to test current consumption in low power of a PIC16F18326.
So I put a 32768KHz crystal as main external oscillator and nothing more.
| Code: | #include <16F18326.h>
#FUSES PROTECT,NOWDT,LP,NOBROWNOUT,NOLVP,NOFCMEN,NOMCLR,NOPUT,LPBOR,BORV27
#use fast_io (ALL)
#byte PMD0 = getenv("SFR:PMD0")
#byte PMD1 = getenv("SFR:PMD1")
#byte PMD2 = getenv("SFR:PMD2")
#byte PMD3 = getenv("SFR:PMD3")
#byte PMD4 = getenv("SFR:PMD4")
#byte PMD5 = getenv("SFR:PMD5")
void main(void)
{
set_tris_a(0b00000000);
set_tris_c(0b00000000);
setup_timer_0(T0_INTERNAL|T0_DIV_32);
clear_interrupt(INT_TIMER0);
PMD0=0b01111111;
PMD1=0b11111110;//Habilito Timer0
PMD2=0b11111111;
PMD3=0b11111111;
PMD4=0b11111111;
PMD5=0b11111111;
output_toggle(PIN_C1);
enable_interrupts(INT_TIMER0);
set_timer1(0);
while(1)
{
output_toggle(PIN_C2);
while(!interrupt_active(INT_TIMER0))//500mSec. interrupt
{
delay_cycles(1);
}
clear_interrupt(INT_TIMER0);
}
} |
And I'm getting not less than 42µA@3.8V if I put the internal LDO in low power mode.
I'm new on this microcontroller.
I check OSCCONx, WPUx and so to disable them.
This microcontroller has so many registers that probably I'm forgetting something.
Could you provide some suggestions?
_________________
Electric Blue |
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temtronic
Joined: 01 Jul 2010
Posts: 9226
Location: Greensville,Ontario
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| Posted: Mon Jul 10, 2017 3:57 pm |
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While I don't use that PIC a general comment to obtain 'low power' you must turn off EVERY peripheral that can be attached (accessed) to EVERY I/O pin. Obvious ones are ADC, comparators,UARTs, etc. Then of course, each pin should be set low or high never ever left 'floating'.
You should read Microchip's app notes about low power modes, I'm sure there are several but the one from 20 years ago still applies today !
Jay |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jul 10, 2017 6:20 pm |
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One problem is that the datasheet for the 1618326 is very preliminary.
They don't even have a section for the LP oscillator. They don't list
power consumption specs for 5.0v, so there is no way to extrapolate
to the 3.8v Vdd that you're using.
Also, 3.8v is somewhat of an oddball voltage in terms of low power usage.
Microchip in terms of their specs, really believes that low power is for 3.0v
and below.
If you look at the 16F1847 datasheet in the Electrical section, you can
see it's a much more fully spec'ed out PIC:
http://ww1.microchip.com/downloads/en/DeviceDoc/40001453E.pdf
Look at this table on page 350:
| Quote: | | TABLE 30-2: SUPPLY CURRENT (IDD) |
If we look at data D010A which is for the "F" version, we can extrapolate
about 28 ua @ 3.8v. That's not terribly different from what you're getting. |
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E_Blue
Joined: 13 Apr 2011
Posts: 417
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| Posted: Tue Jul 11, 2017 12:28 pm |
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I will change to PIC16F1826, seems to have a couple of years in the market.
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Electric Blue |
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