EK-TM4C1294XL hibernation current

#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include "inc/hw_gpio.h"
#include "inc/hw_hibernate.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_sysctl.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/hibernate.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/systick.h"
#include "drivers/pinout.h"


int
main(void)
{
    uint32_t ui32SysClock;

    //
    // Run from the PLL at 120 MHz.
    //
    ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                           SYSCTL_OSC_MAIN |
                                           SYSCTL_USE_PLL |
                                           SYSCTL_CFG_VCO_480), 120000000);

    //
    // Configure the device pins.
    //
    PinoutSet(false, false);

    //
    // Enable the hibernate module.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_HIBERNATE);

    //
    // Configure Hibernate module clock.
    //
    HibernateEnableExpClk(ui32SysClock);

    //
    // Enable RTC mode.
    //
    HibernateRTCEnable();

    //
    // Configure the hibernate module counter to 24-hour calendar mode.
    //
    HibernateCounterMode(HIBERNATE_COUNTER_24HR);

    //
    // Configure GPIOs used as Hibernate wake source.
    // PK7 is configured as a wake source.
    //
    GPIOPinTypeGPIOInput(GPIO_PORTK_BASE, GPIO_PIN_7);
    GPIOPadConfigSet(GPIO_PORTK_BASE, GPIO_PIN_7, GPIO_STRENGTH_2MA, (GPIO_PIN_TYPE_WAKE_LOW | GPIO_PIN_TYPE_STD_WPU));

    while (GPIOPinRead(GPIO_PORTK_BASE, GPIO_PIN_7) == 0)
        ;

    //
    // Enable processor interrupts.
    //
    IntMasterEnable();

    //
    // Read and clear any status bits that might have been set since
    // last clearing them.
    //
    HibernateIntClear(HibernateIntStatus(0));

    //
    // Configure Hibernate wake sources.
    //
    HibernateWakeSet(HIBERNATE_WAKE_GPIO | HIBERNATE_WAKE_RESET);

    //
    // Request Hibernation.
    //
    HibernateRequest();

    //
    // Wait for a while for hibernate to activate.  It should never get
    // past this point.
    //
    SysCtlDelay(100);

    //
    // Wait here.
    //
    while(1)
    {
    }
}

Hello Benson,

The EK-TM4C1294XL is a evaluation platform. So current numbers may not be representative of the application. Note that the additional current may be due to Ethernet PHY + Magnetics. If you are using VDD3ON mode then it is required to have a separate LDO to attain the same currents as the specification.

If it is VDD3OFF Mode then we need to debug why the current is higher.

Regards
Amit