LAUNCHXL-CC1312R1: how to reduce power consumption on ADC

Muhammad Juan Pradana

Tool/software:

Hi everyone,

I tried to implement adc in my project. When I didn't add adc in .syscfg file, the power consumption is only about 1.28 uA.

But when I added adc to the .syscfg file, the power consumption became around 61.9uA.

I haven't even done anything about the adc library in my program, but why is the adc already consuming power? How to optimize the power consumption, I want the adc to be active only when I need it in the program. This ADC will later be used to measure the voltage entering the DIO23 pin.

Regards,
Juan

10 months ago

0 ZC 10 months ago

TI__Genius 17875 points

Hi Juan,

Have you reviewed the SDK examples adcsinglechannel and adcbufcontinuous ? They provide a starting point for using the ADC library. Additionally you could consider utilising the Sensor Controller.

adcsinglechannel : https://dev.ti.com/tirex/explore/node?node=A__ACP8n-eEUUnynk7pLMwchA__com.ti.SIMPLELINK_CC13XX_CC26XX_SDK__BSEc4rl__LATEST
adcbufcontinuous : https://dev.ti.com/tirex/explore/node?node=A__AAdkeKY8QzdbU5Mot3.2NA__com.ti.SIMPLELINK_CC13XX_CC26XX_SDK__BSEc4rl__LATEST
SimpleLink Academy training for the Sensor Controller basics: https://dev.ti.com/tirex/explore/node?node=A__AddniPdrlDWP1siaPICBSw__com.ti.SIMPLELINK_ACADEMY_CC13XX_CC26XX_SDK__AfkT0vQ__LATEST

You may also find the replies by Marie H and Arthur R useful in the following thread: https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1287039/cc1312r-power-consumption-regarding-thread-on-cc1312

Regards,

Zack

0 Muhammad Juan Pradana 10 months ago in reply to ZC

Prodigy 40 points

Hi Zack,

First problem resolved after i did this config:

But, why the power consumption becomes around 50uA when I connect DIO23 to the voltage I want to measure. while when I don't connect DIO23, the power consumption is only around 2uA. even though I have closed the ADC in my program.

Sleep consumption while i don't connect voltage to DIO23:

Sleep consumption while i connect voltage to DIO23:

void *mainThread(void *arg0)
{
    ADC_Handle adc;
    ADC_Params params;
    int_fast16_t res;

    ADC_Params_init(&params);

    /* 1 second delay */
    uint32_t time = 10;

    /* Call driver init functions */
    GPIO_init();
    NVS_init();
    ADC_init();

    Display_init();

    display = Display_open(Display_Type_UART, NULL);
    Display_printf(display, 0, 0, "Starting the acdsinglechannel example\n");
    Display_close(display);
    // I2C_init();
    // SPI_init();
    // Watchdog_init();

    /* Configure the LED pin */
    GPIO_setConfig(CONFIG_LED_0_GPIO, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Turn on user LED */
    GPIO_write(CONFIG_LED_0_GPIO, CONFIG_GPIO_LED_ON);

    while (1)
    {
        adc = ADC_open(CONFIG_ADC_0, &params);
        display = Display_open(Display_Type_UART, NULL);
        if (adc == NULL)
        {
            Display_printf(display, 0, 0, "Error initializing CONFIG_ADC_0\n");
            while (1) {}
        }

        res = ADC_convert(adc, &adcValue0);
        if (res == ADC_STATUS_SUCCESS)
        {
           adcValue0MicroVolt = (COMPENSATION_FACTOR * ADC_convertRawToMicroVolts(adc, adcValue0)) / 1000;
           Display_printf(display, 0, 0, "CONFIG_ADC_0 raw result: %d\n", adcValue0);
           Display_printf(display, 0, 0, "CONFIG_ADC_0 convert result: %d uV\n", adcValue0MicroVolt);
        }
        else
        {
           Display_printf(display, 0, 0, "CONFIG_ADC_0 convert failed\n");
        }

        Display_close(display);
        ADC_close(adc);

        GPIO_toggle(CONFIG_LED_0_GPIO);
        sleep(time);
    }
}

Regards,
Juan

+1 Muhammad Juan Pradana 10 months ago in reply to ZC

Prodigy 40 points

Hi Zack,

I already solved my use case.

1. set pull down while not used

2. enable pinmux while i want to use the pin and disable pinmux while i don't want to use (before sleep) on my program

#include <ti/devices/cc13x2_cc26x2/driverlib/ioc.h>

IOCPortConfigureSet(IOID_23, IOC_PORT_GPIO, IOC_INPUT_ENABLE);

IOCPortConfigureSet(IOID_23, IOC_PORT_GPIO, IOC_INPUT_DISABLE);

Thank you.

Regards,

Juan

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LAUNCHXL-CC1312R1: how to reduce power consumption on ADC