LP-MSPM0L1306: how to set COMP to standby0 for power saving?

Sydney,

Do you mean that I cannot set power policy to standby0 when using comp +DAC?

if I select ULP mode, the evm power consumption is still 2.4mA.

from datasheet, it can achieve 0.8uA. How can I achieve it without setting power policy?

BR,

frank

Hello Frank,

Yes you can set DL_SYSCTL_setPowerPolicySTANDBY0() but I would actually recommend setting STANDBY1. The following is from the MSPM0L driver library:

"In STANDBY1, only TIMG0 and TIMG1 receive ULPCLK/LFCLK. The RTC continues to receive RTCCLK. A TIMG0/1 interrupt, RTC interrupt, or ADC trigger in STANDBY1 always triggers an asynchronous fast clock request to wake the system. Other PD0 peripherals (such as UART, I2C, GPIO, and COMP) can also wake the system upon an external event through an asynchronous fast clock request, but they are not actively clocked in STANDBY1."

As far as not using power policy to achieve this have you tried using the "Ultra-low-power general-purpose with output filter" COMP profile?

Regards,

Sydney

Sydney,

As I mention in last reply, if I use COMP ULP mode, the power consumption is still 2mA. If I remove all jumps and R2 from evm, the power consumption is still 0.99mA.

If I use COMP ULP mode + Standby0, the interrupt has issue which is my question for this ticket.

I cannot use STANDBY1 for this project because I need interrupt. 

So, do you have example to achieve  lowest power consumption with COMP + DAC.

BR,

frank

Hello Frank,

I will test this and get back to you by tomorrow end of day. Thank you for your patience.

Regards,

Sydney

Hello Frank,

After looking into this issue I was unable to find a low pulse after changing the low power mode to STANDBY0 using that file. There should be no required STANDBY configurations for the COMP to work correctly. Which production version of the MSPM0L1306 are you using as this may contribute to your issue. 

Regards,

Sydney

Sydney,

I use PG2 LP-MSPM0L1306 evm (rev A).

can you share the sysconfig and main code w/o issue?

BR,

frank

Hello Frank,

Just to compare situations are you using CCS, if so what version? Also, attached is what I used to test this problem. Please let me know if the issue continues to give a low pulse.

Regards,

Sydney

comp_hs_dac_vref_external.zip

Sydney,

I use your files. I can still see the issue.

Do you set PA27 to low?

BR,

frank

Hello Frank,

No I do not set PA27 to low, I leave everything as the example has it other than switching the low power policy to standby0. This may be a device issue, I am continuing to run tests and PA27 is a little noisy but it never drops below 3.3V.

Regards,

Sydney

Sydney,

from the code, set PA27 to low then PA0 would become high.

You should be able to see the issue when set PA27 to low.

BR,

frank

Hello Frank, 

As to replicate your code exactly will you send me your SysConfig and .c file so I can test what you are running?

Regards,

Sydney

Sydney,

I use your .c and sysconfig file. I can see the issue by put PA27 to low. you can see PA0 is low but have high pulse.

BR,

frank