MSPM0L1306: ADC tolerance

Jerry Kuo

Part Number: MSPM0L1306

Tool/software:

Hi team,

My customer is developing M0L1306. They try to use ADC to detect thermistor. They ask if their VDD (3.3V) tolerance is 5%, how could they measure the accurate temperature ?

Thank you.

5 months ago

0 Diego Abad Sajamin 5 months ago

TI__Genius 14602 points

Hi Jerry,
This will depend of the thermistor you are using. I will read its datasheet to determine if the VDD tolerance could affect the readings from it. As in for the M0L1306, the only advice will depend on which VREF you use for your ADC. If you use VDD as reference, I'll recommend to review the formula that our ADC uses to convert the input signal into a digital value. If you use the internal VREF (1.4 or 2.5V,) this should not affect the readings (the same applies if you use a external VREF.)

Best Regards,

Diego Abad

0 Jerry Kuo 5 months ago in reply to Diego Abad Sajamin

TI__Expert 4320 points

Hi Diego,

Thanks for your valuable information. I will let customer to feedback if they need more information. Thank you.

0 Jerry Kuo 5 months ago in reply to Jerry Kuo

TI__Expert 4320 points

Hi Diego,

My customer refer to LP-MSPM0L1306, but they use different thermistor (NCU15WF104F60RC). Please check its spec. and customer want to make sure if 3.3V become 3.25V, how could they make sure if the ADC read correct value ?

0 Diego Abad Sajamin 5 months ago in reply to Jerry Kuo

TI__Genius 14602 points

Hi Jerry,
The MSPM0L1306 ADC will be able to read any reading from the thermistor. I recommend consulting Murata Electronics about this since they would know better how their thermistor will behave under a sudden change in value and any example circuit on properly setting the thermistor for readings.
Diego Abad

0 Jerry Kuo 5 months ago in reply to Diego Abad Sajamin

TI__Expert 4320 points

hi Diego,

Thanks for your suggestion. I will notify customer.

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MSPM0L1306: ADC tolerance