MSPM0G3106-Q1: asking the time base dependency of WWDT

Mat He

Prodigy 70 points

Part Number: MSPM0G3106-Q1
Other Parts Discussed in Thread: MSPM0G3519,

Tool/software:

Hello TI expert

I have couple of questions regarding the WWDT of M0G series,

In TRM chapter 30 "WWDT", it states :

-- the time base of WWDT is independent of the MCLK and CPUCLK

-- the LFCLK shall be synchronized to MCLK before sourcing the WWDT module

-- there have possibility the MCLK fails and lose synchronization with LFCLK

I guess MCLK acts the role of gate control, if MCLK failed then LFCLK can't pass through the sync module to drive the WWDT module.

so I want to know if the time base of WWDT can be considered as truly independent? if not, are there any other suitable MCU available?

On which condition the MCLK might fail and lose the synchronization, it's failure rate?

MSPM0 G-Series 80-MHz Microcontrollers Technical Reference Manual (Rev. B)

Thanks

7 months ago

0 Shailesh Thakurdesai 7 months ago

TI__Intellectual 1090 points

HI ! The MSPM0G3106-Q1 does have dependency on MCLK if you are sourcing it via HFXT. In case of Sys Osc, you should not have this failure. Also, as explained in the document, the MCLK monitor would still look for a valid sync signal and would reset if signal not received . Hope that clarifies. We do have a new MCU - MSPM0G3519 which has independent watchdog timer. MSPM0G351x Mixed-Signal Microcontrollers With CAN-FD Interface datasheet (Rev. A) . You can consider this MCU as well.