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Brownout Protection MSP430G2XXX, MSP430F5XXX

Ali Fares
Prodigy 110 points
Other Parts Discussed in Thread: MSP430F135, MSP430G2101, MSP430F5308

 

When I used the MSP430F135 (older device) I had problems where if the pwr supply voltage did not go to zero when shut down and if there was some capacitance still charged to about .5V, on the next turn, based on timing,  the MSP430 would malfunction. To fix this, I put an Under Voltage Lockout device on the reset pin, such that if the voltage was less than 1.8V, it would hold the MCU in reset.

 

Nowadays, I see Brownout protection on IC’s like on the MSP430G2101 and the MSP430F5308. Will this brownout feature guarantee that the MCU will not malfunction when weird things go on with the power supply rails?. If I can trust the brownout feature, I can remove the UVL IC’s I am using and save money. Please advise.

  • 0
    Guru 227245 points

    Wehad similar problems with the 1232 and the 149 which went with the 1611 (with brownout detection).
    This 'Lazarus effect' was driving us crazy until we added an UVL device too (which in turn was blocking the programmer as it was holding the RST pin low because teh MSP didn't trigger the integrated watchdog)
    So basically, yes, you can dump the UVL ICs. However, the range in which the BOR applies is perhaps below the minimum operating voltage. The 5438 lists it to be 1.55V max, which doesn't say much to when the BOR will happen for sure. But in addition, there is a programmable voltage supervisor on many devices which can be adjusted to a tighter fit. I had to use it since we used the 1611 with 8MHz, requiring >3.3V, so the brownout with <1.75V was too late. However, the brownout detection was always good for a safe power cycle.

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