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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

Hi,

I have a design based on a CY8C3865LTI-014.

I noticed that in reality the sleep current was much too high than anticipated (more than 25µA higher).

The steps I took to debug this were:

- remove all components but the PSOC and the surrounding caps from the PCB

- build a fresh project without components, and only this code:

```

int main(void)

{

    CyGlobalIntEnable; /* Enable global interrupts. */

   

    // set 32kHz crystal to operate in low power mode when in sleep

    CyXTAL_32KHZ_SetPowerMode(1);

   

    //start WDT

    CyWdtStart(CYWDT_1024_TICKS,CYWDT_LPMODE_DISABLED);

   

    /* Place your initialization/startup code here (e.g. MyInst_Start()) */

    CyPmSaveClocks();

    for(;;)

    {

        /* Place your application code here. */

        // clear wdt

        CyWdtClear();

       

        // sleep 1 s

       

        CyPmSleep(PM_SLEEP_TIME_ONE_PPS,PM_SLEEP_SRC_NONE);

        CyPmReadStatus(CY_PM_ONEPPS_INT);

       

    }

    CyPmRestoreClocks();

}

```

As one can see, after initialisation, the PSOC goes in sleep mode forever.

When measuring the current, I still measure ~28µA, which is much more than the specified 1µA in the datasheet.

What could be the cause of this high sleep current?

I attached the project for you reference.

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