MSP430FR5969: Current measurement

sadasivam arumugam

Part Number: MSP430FR5969
Other Parts Discussed in Thread: MSP430FR5739

Hi Sir,

I am working on MSP430FR5969 Launchpad for getting current consumption of LPM state. When I used the example code(msp430fr59xx_lpm4-5_02.c) and made a current measurement, I am getting I=3.41 mA.(LPM4.5).

Expected is,

And, you have mentioned in other query that, it may happen due to other modules be open there.

Now in my code i am refering only to GPIO and Clock modules. But, it is taking more current. So, kindly give the steps for exact current measurement. After getting clear idea on current, then I can able to make it for all modules with referring to example codes. Kindly do the needful. Thanks.

And my current measurement setup-

over 6 years ago

0 Johnson He over 6 years ago

TI__Mastermind 30406 points

Hi sadasivam,

I am testing and analyzing, I will reply you later.

Best Regards

Johnson

0 Johnson He over 6 years ago

TI__Mastermind 30406 points

Hi sadasivam,

You should disconnect J6 during the test, and the current consumed by the LED 1 when measuring the current of about 3.5ma. It is not consumed by LPM4.5.

And you also can measuring the current though our tools of EneryTrace. In order to ensure the accuracy of the measurement results, please disconnect all connections of J13 when using this tool, except GND and V+, like this :

Best Regards

Johnson

0 sadasivam arumugam over 6 years ago in reply to Johnson He

Intellectual 940 points

Hi Sir,

Thank you for your reply. I am working on it. Now I am getting 0.1 uA(max. 0.4 uA for SVS including) from the set up you have mentioned. And will try all examples and get cleared on current measurement.

0 sadasivam arumugam over 6 years ago in reply to Johnson He

Intellectual 940 points

Hi Sir,

Now I am trying to interface USCI_A0 and USCI_A1 for SPI communication for my custom board. For that, I have configured as SPI in selection registers. And I am waking at when I press button interrupt.

But for entering into LPM4.5, in posts "msp430fr5739: LPM4.5 Issue with SPI", if we use peripherals, all has to reset.

My question in this regard is, before entering into LPM4.5, after RESET the SPI function and whether we have to configure it as GPIO pins or not. And can you please suggest me what are the steps needed to go before LPM4.5. And is BIC = GIE is needed.

And after LPM4.5 exit, I expected to wake in Pin ISR. But, if I check with (if(SYSRSTIV == SYSRSTIV_LPM5WU): condition, the loop enters during the unknown time. Question is: Whether we want to check like this or we can check as specified in Userguide: PMMLPM5IFG check. is there a sample code for verifying my issue.

0 Johnson He over 6 years ago in reply to sadasivam arumugam

TI__Mastermind 30406 points

Hi sadasivam,

I am sorry to reply you so late.

You can refer to the user's guide for entering and exiting the LPM4.5 mode. As shown in the figure below,

Attach reference code:

http://dev.ti.com/tirex/explore/node?node=AEvNk7PABcHF-blXtGUaqA__IOGqZri__LATEST

http://dev.ti.com/tirex/explore/node?node=ANvWtA-nx2O3wEpZfkZVOw__IOGqZri__LATEST

Best Regards

Johnson

0 sadasivam arumugam over 6 years ago in reply to Johnson He

Intellectual 940 points

Hi Sir,

Sorry, I could not get it. I want to know if I am using SPI, Timer, RTC, GPIO functionality, how to set the pins before going into LPM4.5.

I suspect of declaring those pins as GPIO/ disable their functionality is enough though. Thanks for the repy.

0 Johnson He over 6 years ago in reply to sadasivam arumugam

TI__Mastermind 30406 points

Hi sadasivam,

In order to reduce the current consumption in PLM4.5 mode, all pins need to be set as output pins before entering 4.5 mode, and SPI, RTC and other functions can be configured after waking up from LPM4.5 mode.

If I/O is configured as a SPI or other function before entering LPM4.5, it may cause leakage current due to connection with an external circuit, resulting in large power consumption in LPM4.5 mode.

Best Regards

Johnson

0 sadasivam arumugam over 6 years ago in reply to Johnson He

Intellectual 940 points

Hi Sir,

Thank you for your reply. I will test accordingly and give you the result.

0 Johnson He over 6 years ago in reply to sadasivam arumugam

TI__Mastermind 30406 points

Hi sadasivam,

This post has been around for a long time, and the problem (Current measurement) has been solved. In order to make it easier for other community members to view, I set this post to close. If you have other questions, you can create a new post to discussion,in order for us to see this kind of issue that you discussed earlier, you can attach this post link when you create a new post, we will further support you. Of course, you can also privately discuss me by letter.

thank you~

Best Regards

Johnson

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

MSP430FR5969: Current measurement