MSP430Fr2033: Dynamic Switching ADC reference between internal ref(1.5v) and VCC(3.3v)

SHRAVAN BOMMU

Part Number: MSP430FR2033

I have a application like some adc channels i have read with ref voltage of VCC (ADCSREF_0) and some Adc channels i have to read with ref of internal 1.5v (ADCSREF_1).

there will be a any issue if we change dynamically reference voltage very frequently(once in 100 msec).

over 8 years ago

0 Cameron LaFollette over 8 years ago

TI__Genius 14875 points

Hi Shravan,
The user guide states that the Internal Reerence has a settling time of <30 uS, so you should be good, provided the reference has settled by the time you read.

0 SHRAVAN BOMMU over 8 years ago in reply to Cameron LaFollette

Intellectual 350 points

its working fine now i am enabling ADC interrupt in <30Us. in user guide stated <30 usec but worst case how much we have to consideration for settling time.

0 Cameron LaFollette over 8 years ago in reply to SHRAVAN BOMMU

TI__Genius 14875 points

Shravan,
That should be the worst case, since it is showing as always being under 30uS settling time.

0 Cameron LaFollette over 8 years ago in reply to Cameron LaFollette

TI__Genius 14875 points

Shravan,
I'm closing this. Please let me know if you need additional help.

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MSP430Fr2033: Dynamic Switching ADC reference between internal ref(1.5v) and VCC(3.3v)