MSP430FR5043: Question Regarding "Meter Constant" Parameter in Ultrasonic Sensing Design Center

Part Number: MSP430FR5043

Tool/software:

Dear TI Engineers

I have a question regarding the "Meter Constant" parameter that can be configured in the Ultrasonic Sensing Design Center.

According to the documentation, the valid range for this parameter is:
Range: 0 to 22,742,000
However, I tried setting a value greater than 22,742,000, and the Design Center accepted the input without any error. After pressing "Generate Headers", I checked the generated USS_userConfig.h file and found that the value I entered was correctly reflected in:
#define USS_VOLUME_SCALE_FACTOR <entered_value>

Moreover, the instantaneous flow rate calculated by the MSP430 seems to be reasonable and not erroneous.

Could you please clarify:

・What happens internally when a value greater than 22,742,000 is set?
・Is there any limitation or risk in using values beyond the documented range?
・Is the USS_VOLUME_SCALE_FACTOR directly derived from the Meter Constant, and is it safe to rely on this behavior?

Thank you very much for your support.

Best regards,

**Attention** This is a public forum