MSP430F5418A: Reset Issue

Hello Deepak,

I highly suspect you are getting some kind of noise propagation through your DVCC rail or the changover is not happening quick enough so you get a dip in power. Either of these situations could cause a Frequency vs Voltage vs VCORE Level violation which can cause unspecified behavior, including resets, as the device is running out of spec in this situation. I would suggest probing the VCC pin of the MSP430 when this changeover happens to see what the voltage level is. Then coordinate the lowest voltage level seen with the VCORE level you are running and what frequency your device is running at to see if a violation occurs. the chart to reference here is Figure 5-1 in the datasheet. You can use the SVS and SVM on this part to either give you warning before the voltage dips too low, or to auto-reset the part before a violation occurs

Also, I did not do a full schematic review, but I did notice that your cap on the VCORE pin is too low. It needs to be 470nF (0.47uF). The low capacitance can cause some stability issues as well. 

as far as Xtal goes, a 20MHz xtal can definitely be used with this device on the XT2 pins or the XT1 pins when that module is in high Frequency mode. I suspect your increased resets are correlated with the above suggestion and potentially running the device faster with the faster base Xtal clock, thus the faster the speed the MCU is running the higher the threshold voltage is for a violation.

for the LEDs, the MSP430 will not be able to drive that many LEDs directly. You would need to use a FET of some sort with the MSP430 driving the gate voltage.

Hello Deepak,

The chart explain what the minimum voltage level, and minimum VCORE level needs to be for a given frequency. The same information is conveyed in the specification table above the figure at the start of section 5.3. the exact numbers are device specific, but let's take the example of 14MHz for this device. If you try to run the device at 14MHz, then you must keep the DVCC voltage above 2.2V and a VCORE level of 2 or higher. 8/12/20/25 are the boundary frequencies here and it is recommended if you want to use a specific boundary frequency (say 20MHz) then you want to use the minimal levels of one higher block (in this example if at 20MHz then keep voltage above 2.4V and at VCORE Level 3). The reason for this recommendation on the boundary frequency is that the DCO can vary slightly which means some variance above the requested frequency is possible.

For more understanding of the VCORE levels and how to change them, I highly recommend you perusing Section 2 of the User Guide. Examples of how to change VCORE level and frequency of the device can be found in our standard code examples located within TI Resource Explorer > Software -> MSP430Ware-> devices -> MSP430F5xxx_6xxx -> MSP430F5418A -> Peripheral Examples -> Register level. Look for an example that changes MCLK above 8 MHz.

TI Resource Explorer can be found within CCS or our cloud version is available at http://dev.ti.com/tirex/#/

Hello Deepak,

Glad to here the reset issue is fixed.

As far as your measurement issues, this is beyond the help I can give as this would be application specific. For energy measurement applications, we do provide the Energy Measurement Design Center ( www.ti.com/.../MSP-EM-DESIGN-CENTER ) that could help your customer, but this is focused towards our MSP430s that contains precision Delta Sigma ADCs rather than the 12-bit SAR that is in the MSP430F5418A.