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Customer used non-ADC part in ADC design...

Other Parts Discussed in Thread: MSP430F4491

Hi Folks,

 

One of my customers accidentally ordered the MSP430F4491 instead of the 'F449, and built 10,000 boards. It only uses the ADC to monitor battery voltage, and they think they can get away without that. If possible, they don't want to change the firmware because they don't want to qualify or maintain a new version.

 

How is the ADC in the 'F4491 disabled? Will the interrupts and IFG bit still work, or is the software likely to get stuck waiting for the IFG? Will the ADC return  a particular value, or a random number?

Surprisingly, about 30% of the boards are passing the production wraparound test. Is this because TI just marks an 'F449 as an F4491 when they need them? Or are 'F449 parts made into 'F4491's if the ADC fails testing, and random behavior can occur? Or a 2:1 mix of those options? (or my production test is faulty)... When I was at TI, it was my understanding that the MSP430 (at least in that family) was tested 100% good, and then fuses were blown to disable memory or modules to make cheaper parts. Is that no longer the case?

 

thanks,

Mike.

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