LPC11Exx power down mode.

[lpcware]

Content originally posted in LPCWare by sicotc on Fri Jan 09 07:26:05 MST 2015
Hello,
I configured the LPC11E14 for working with IRC oscillator :

file system_LPC11Exx.c in CMSIS_CORE_LPC11Exx library :

#define CLOCK_SETUP           1
#define SYSOSCCTRL_Val        0x0              // Reset: 0x000
#define WDTOSCCTRL_Val        0x0              // Reset: 0x000
#define SYSPLLCTRL_Val        0x0              // Reset: 0x000
#define SYSPLLCLKSEL_Val      0x0              // Reset: 0x000
#define MAINCLKSEL_Val        0x0              // Reset: 0x000
#define SYSAHBCLKDIV_Val      0x1              // Reset: 0x001

(I used CMSIS_Configuration_Wizard software)
So the main clock is 12 MHz.
see clock_configuration.pdf for more details.

the main software for going to power down mode :

int main(void) {
SystemCoreClockUpdate();
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO);

LPC_IOCON->PIO0[1]=0 | (1<<7);
//put all port 0 pin in output except GPIO0_1 ISP pin with external pull up for ISP programmer
LPC_GPIO->DIR[0] = 0xFFFFFF & ~(1<<1);
//put all output LOW (no pin connected to load)
LPC_GPIO->PIN[0] = 0;

//put all port 1 pin in output
LPC_GPIO->DIR[1] = 0xFFFFFFFF; //(no pin connected to load for the test)
//put all output LOW
LPC_GPIO->PIN[1] = 0;

//UM10518 manual page 40
LPC_WWDT->MOD=0; //to be sure lock bit 5 in the WWDT MOD register is not set.
LPC_PMU->PCON  = (1<<11);//clear DPDFLAG if set
LPC_PMU->PCON |= (1<<8);//clear deep sleep flag
LPC_PMU->PCON = 2;//power down config
// power down configuration
LPC_SYSCTL->PDSLEEPCFG = ( 0x37 //  reserved bit
| (0x1FF << 7)// reserved bit : see http://docs.lpcware.com/lpc800um/RegisterMaps/syscon/r-PDSLEEPCFG.html
| SYSCTL_DEEPSLP_BOD_PD/* BOD power-down control in Deep-sleep mode, powered down */
| SYSCTL_DEEPSLP_WDTOSC_PD /* Watchdog oscillator power control in Deep-sleep, powered down */
);
// peripheral power down

LPC_SYSCTL->PDRUNCFG= (0xED00//  reserved bit
//| SYSCTL_POWERDOWN_IRCOUT_PD /* IRC oscillator output power down */
//| SYSCTL_POWERDOWN_IRC_PD    /* IRC oscillator not power-down */
//| SYSCTL_POWERDOWN_FLASH_PD  /* Flash not power down */
| SYSCTL_POWERDOWN_BOD_PD    /* BOD power down */
| SYSCTL_POWERDOWN_ADC_PD    /* ADC power down */
| SYSCTL_POWERDOWN_SYSOSC_PD /* System oscillator power down */
| SYSCTL_POWERDOWN_WDTOSC_PD /* Watchdog oscillator power down */
| SYSCTL_POWERDOWN_SYSPLL_PD /* System PLL power down */
);

LPC_SYSCTL->PDWAKECFG= ( 0xED00//  reserved bit
//| SYSCTL_SLPWAKE_IRCOUT_PD /* IRC oscillator output wake-up configuration */
//| SYSCTL_SLPWAKE_IRC_PD    /* IRC oscillator power-down wake-up configuration */
//| SYSCTL_SLPWAKE_FLASH_PD  /* Flash wake-up configuration */
| SYSCTL_SLPWAKE_BOD_PD    /* BOD wake-up configuration */
| SYSCTL_SLPWAKE_ADC_PD    /* ADC wake-up configuration */
| SYSCTL_SLPWAKE_SYSOSC_PD /* System oscillator wake-up configuration */
| SYSCTL_SLPWAKE_WDTOSC_PD /* Watchdog oscillator wake-up configuration */
| SYSCTL_SLPWAKE_SYSPLL_PD /* System PLL wake-up configuration */
);
// Enter sleep mode
SCB->SCR |= (1 << 2);//SLEEPDEEP = 1 in system control register
__WFI(); //will never wake up
while(1);
}

I removed all pin wakeup configuration in the code (it work fine).
I use an empty PCB with :
[list]
  [*]LPC11E14
  [*]ISP connector for programmation
  [*]external pull up for the reset.
  [*]external pull up for ISP pin
[/list]

When I am in low power mode, I measure 2,4 mA !!!!
I measure the same thing on 2 differents boards.

during the reset, the current decrease to around 1,3 mA.
The clock seems to work again in power down mode.
If I put an output pin state at 1 after __WFI() instruction, the output stay in 0 which prove __WFI() works.
what's wrong ?

Find attached the workspace for the test.
thanks for your Help.

SicotC

Original Attachment has been moved to: testLowPower.zip

[lpcware]

Content originally posted in LPCWare by sicotc on Mon Jan 12 05:44:11 MST 2015
I find the problem....

at the begin of main fonction, when I initialise IO with the following code :

        Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
LPC_IOCON->PIO0[1]=0 | (1<<7);
//put all port 0 pin in output except GPIO0_1 ISP pin with external pull up for ISP programmer
LPC_GPIO->DIR[0] = 0xFFFFFF & ~(1<<1);
//put all output LOW (no pin connected to load)
LPC_GPIO->PIN[0] = 0;
//put all port 1 pin in output
LPC_GPIO->DIR[1] = 0xFFFFFFFF; //(no pin connected to load for the test)
//put all output LOW
LPC_GPIO->PIN[1] = 0;

I have 2,4 mA.

I create the following fonction

const uint32_t ionum0[24]={
255,//1 | (1<<7),//reset function
0 | (1<<7),//PIO0_1
0 | (1<<7),//PIO0_2
0 | (1<<7),//PIO0_3
0 | (1<<8),//PIO0_4
0 | (1<<8),//PIO0_5
0 | (1<<7),//PIO0_6
0 | (1<<7),//PIO0_7
0 | (1<<7),//PIO0_8
0 | (1<<7),//PIO0_9
255, //1 | (1<<7),//PIO0_10 SWCLK function
1 | (1<<7),//PIO0_11
1 | (1<<7),//PIO0_12
1 | (1<<7),//PIO0_13
1 | (1<<7),//PIO0_14
255,//1 | (1<<7),//PIO0_15 SWDIO function
0 | (1<<7),//PIO0_16
0 | (1<<7),//PIO0_17
0 | (1<<7),//PIO0_18
0 | (1<<7),//PIO0_19
0 | (1<<7),//PIO0_20
0 | (1<<7),//PIO0_21
0 | (1<<7),//PIO0_22
0 | (1<<7),//PIO0_23
};

const uint32_t ionum1[32]={
0 | (1<<7),//PIO1_0
0 | (1<<7),//PIO1_1
0 | (1<<7),//PIO1_2
0 | (1<<7),//PIO1_3
0 | (1<<7),//PIO1_4
0 | (1<<7),//PIO1_5
0 | (1<<7),//PIO1_6
0 | (1<<7),//PIO1_7
0 | (1<<7),//PIO1_8
0 | (1<<7),//PIO1_9
0 | (1<<7),//PIO1_10
0 | (1<<7),//PIO1_11
0 | (1<<7),//PIO1_12
0 | (1<<7),//PIO1_13
0 | (1<<7),//PIO1_14
0 | (1<<7),//PIO1_15
0 | (1<<7),//PIO1_16
0 | (1<<7),//PIO1_17
0 | (1<<7),//PIO1_18
0 | (1<<7),//PIO1_19
0 | (1<<7),//PIO1_20
0 | (1<<7),//PIO1_21
0 | (1<<7),//PIO1_22
0 | (1<<7),//PIO1_23
0 | (1<<7),//PIO1_24
0 | (1<<7),//PIO1_25
0 | (1<<7),//PIO1_26
0 | (1<<7),//PIO1_27
0 | (1<<7),//PIO1_28
0 | (1<<7),//PIO1_29
0 | (1<<7),//PIO1_30
0 | (1<<7),//PIO1_31
};

void io_numInit(uint32_t port0, uint32_t port1)
{
uint32_t pin;

Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);

//put all port 0 pin in GPIO function except reset pin. All pin with pull-up disabled
for(pin=0;pin<24;pin++)
{
if(ionum0[pin]!=255) LPC_IOCON->PIO0[pin] = ionum0[pin];
}
//put all port 0 pin in output except GPIO0_17, GPIO0_23, GPIO0_1, GPIO0_0,
LPC_GPIO->DIR[0] = 0xFFFFFF & ~port0;

//put all output LOW
LPC_GPIO->PIN[0] = 0;

//put all port 1 pin in GPIO function, output LOW, All pin with pull-up disabled
for(pin=0;pin<32;pin++)
{
if(ionum1[pin]!=255) LPC_IOCON->PIO1[pin] = ionum1[pin];
}
LPC_GPIO->DIR[1] = 0xFFFFFFFF & ~port1;
//put all output LOW
LPC_GPIO->PIN[1] = 0;
}

and I change the main fonction initialisation with :

io_numInit((1<<1),0);//all in output, except ISP pin

I measure : 11,7 uA
and with the following code :

io_numInit((1<<1),0);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_IOCON);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_GPIO);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_PINT);

I measure 2,1uA ....

I will try to find which pin configuration make the default.

Regards

[lpcware]

Content originally posted in LPCWare by sicotc on Fri Jan 09 22:26:47 MST 2015
thanks for your reply,
I use my own board (see attached schematic). I connect the minimum components for the test. Nothing is connected to U6 during the measurement.
I tried on 2 boards with the same result.
Thanks for the application note I didn't find before. I will check my configuration once again according to the example.

Regards.

[lpcware]

Content originally posted in LPCWare by nerd herd on Fri Jan 09 08:49:26 MST 2015
Hi Sicotc,

What exactly is your test point when measuring to see the current consumption? Also, have you taken a look at the code in the low power mode Application Note we have for the LPC11Exx?

http://www.lpcware.com/content/nxpfile/an11612-lpc11u/e6x-low-power-modes-and-wake-up-times