LP-EM-CC1354P10: Capacitive touch power consumption

Part Number: LP-EM-CC1354P10
Other Parts Discussed in Thread: BOOSTXL-ULPSENSE

Tool/software:

Hello,

I'm looking at the example for the capacitive touch of CC1354, in the "Ultra-Low Power Sensing Applications With CC13x2/CC26x2" Documentation it's mentioned 8.1uA without touch and 128uA with touch,

I've tried this case with the example in the Sensor Controller Studio and implement it very simply in a empty pro jet with CCS Theia :

/*
 * Copyright (c) 2015-2019, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== empty.c ========
 */
/* For usleep() */
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>


/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/apps/LED.h>
#include "ti_drivers_config.h"
#include "C:\Users\ValentinKUNTI\Documents\Texas Instruments\Sensor Controller Studio\examples\cap_touch_ulpsense\source\scif.h"

// SCIF driver callbacks
void scCtrlReadyCallback(void) {
    // Empty callback for task control interface ready
}

void scTaskAlertCallback(void) {
    // Handle alert interrupt from Sensor Controller
    scifClearAlertIntSource();
    scifAckAlertEvents();
}

void *mainThread(void *arg0) {
    // Array to store touch detection state for each pin
    uint16_t touchState[SCIF_CAPACITIVE_TOUCH_PIN_COUNT] = {0};
    LED_Handle led0Handle = LED_open(CONFIG_LED_0, NULL);
    
    // Initialize drivers
    GPIO_init();
    
    // Initialize SCIF
    scifOsalInit();
    scifOsalRegisterCtrlReadyCallback(scCtrlReadyCallback);
    scifOsalRegisterTaskAlertCallback(scTaskAlertCallback);
    scifInit(&scifDriverSetup);
    
    // Configure capacitive touch parameters
    scifTaskData.capacitiveTouch.cfg.isrcCurrent = 0x0011;     // Set current for touch sensing
    scifTaskData.capacitiveTouch.cfg.maxSmplPeriod = 100;      // Maximum sampling period
    scifTaskData.capacitiveTouch.cfg.minSmplPeriod = 30;       // Minimum sampling period
    
    // Reset task structures (except configuration)
    scifResetTaskStructs(1 << SCIF_CAPACITIVE_TOUCH_TASK_ID, 
                        (1 << SCIF_STRUCT_INPUT) | (1 << SCIF_STRUCT_OUTPUT));
    
    // Start the Capacitive Touch task
    if (scifWaitOnNbl(20000) != SCIF_SUCCESS) {
        // Handle timeout error
        return NULL;
    }
    
    if (scifStartTasksNbl(1 << SCIF_CAPACITIVE_TOUCH_TASK_ID) != SCIF_SUCCESS) {
        // Handle start error
        return NULL;
    }
    
    // Main loop
    while (1) {
        // Check for available output data
        while (scifGetTaskIoStructAvailCount(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT) > 0) {
            // Get pointer to output structure
            SCIF_CAPACITIVE_TOUCH_OUTPUT_T* output = scifGetTaskStruct(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT);
            
            // Read touch detection state
            for (int i = 0; i < SCIF_CAPACITIVE_TOUCH_PIN_COUNT; i++) {
                touchState[i] = output->pTouchDet[i];
            }
            
            // Return the buffer to the Sensor Controller
            scifHandoffTaskStruct(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT);
        }
        
        // Toggle LED based on touch state of first pin
        if (touchState[0]) {
            LED_toggle(led0Handle);
        }
        
        // Small delay
        sleep(1);
    }
    
    return NULL;
}

I use the XDS110, with the MSP CapTIvate MCUS board for capacitive testing, unfortunately I can't achieve the 8 or 120 uA power efficiency :



Am I missing something for the configuration ?

Best regards,

Valentin Künti