CCS/MSP430G2553: CCS/MSP430G2553 high power consumption

Josip Zidar

Part Number: MSP430G2553

Tool/software: Code Composer Studio

Good day everyone,

I currently have TI LaunchPad kit with MSP430G2553 microcontroller. I want to have ultra low power consumption in Low Power Mode (since my power supply will be battery).
So far I have terminated I/O pins, and entered LPM4 as described online. But I am still having around 70 uA of current consumption. I was hoping to get to 0.1 uA as stated in datasheet of microcontroller.

My code is below, I have searched and tried some solutions, but none did work or made no difference. The code is made to light up LED for few seconds, and then to go to low power mode.

#include <msp430.h>				

/**
 * blink.c
 */
void main(void)
{
    WDTCTL = WDTPW | WDTHOLD;		// stop watchdog timer

    P1DIR = 0xFF;
    P1OUT = 0x00;
    P2DIR = 0xFF;
    P2OUT = 0x00;
    P3DIR = 0xFF;
    P3OUT = 0x00;


    P1OUT |= BIT0; // ON
    __delay_cycles(3000000);
    P1OUT &= ~BIT0; // OFF


    _low_power_mode_4();
}

If anyone maybe knows how to reduce power consumption even further, it would be really helpful

over 4 years ago

0 Leonardo Estevez over 4 years ago

TI__Genius 12615 points

Hi Josip,

When you measure the current consumption, are you disconnecting all jumpers on the board the USB interface and powering the chip directly from an external power supply?

BR,
Leo

0 Josip Zidar over 4 years ago in reply to Leonardo Estevez

Prodigy 20 points

I have removed jumpers marked with blue, and connected 3.3 V and ampermeter to the pins marked with green.

I have also removed jumpers at P1.0, P2.3, P2.1, P2.5 and P1.6 but they had no impact on current consumption.

I measured ~70 uA @ 3.3 V, and ~40 uA @ 1.8 V.

0 Leonardo Estevez over 4 years ago in reply to Josip Zidar

TI__Genius 12615 points

Hi Josip,

If you run your program before disconnecting the jumpers, CCS may inhibit you from going into the lowest sleep mode. (you should flash your program and then reset the board once you've pulled the jumpers) I would recommend that you start with a code example that puts the board into LPM4 such as:

https://dev.ti.com/tirex/explore/node?compilers=ccs&node=AMP2HfYeQ6-Dxeww.U4SCw__IOGqZri__LATEST&resourceClasses=example&search=G2553

BR,
Leo

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CCS/MSP430G2553: CCS/MSP430G2553 high power consumption