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MSP430I2021: Can this (MSP430I2021) be used instead of ADS1232?

Boopathi Nagarajan
Prodigy 20 points
Part Number: MSP430I2021
Other Parts Discussed in Thread: ADS1232

Hello Team,

I'm planning to use ADS1232 for one of the resistance bridge application (Strain gauge based load cell); and I saw the specifications of MSP430I2021 as well. Both ADS1232 and MSP430I2021 are having 24bit sigma-delta ADC. 

Hence, Can I use MSP430I2021 instead of ADS1232? May I understand the merits / demerits of both the products? 

What would be your suggestion for this load cell application? 

Thank you,

Boopathi N

  • 0
    TI__Mastermind 49692 points

    Hello,

    Resolution

    Both are considered 24-bit SD ADCs but the ADS1232 will have a higher effective number of bits (ENOB) than the integrated SD ADC in the MSP430i2021. The ENOB is basically the number of noise free bits. This depends on the GAIN selected but you can compare their performance by comparing the specs given in the datasheets. For the MSP430i2021, a SINAD value is provided rather than ENOB but you can easily convert from SINAD to ENOB using the following equation.

    ENOB = (SINAD – 1.76)/6.02 dB

    Gain

    Also, the ADS1232 supports GAIN up to 128 whereas the MSP430i2021 only goes up to 16.

    Differential input voltage (Vdiff) range

    The ADS1232 supports Vdiff up to +/-2.5V, and the MSP430i2021 supports up to +/-0.9V.

    Sampling frequency (or data rate)

    However, the ADS1232 only supports two sampling frequencies: 10 samples per second (SPS) or 80SPS. The MSP430i2021 supports sampling frequencies from 4kHz (or SPS) up to 32kHz.

    Configurability

    The ADS1232 is a fixed-function device whereas the MSP430i2021 is a microcontroller that may not match the analog performance specs of the ADS1232 but offers much more flexibility and configurability that the ADS1232 doesn't offer.

    Based on your project requirements, one of these devices should work well for you. I hope this comparison helps your decision!

    Regards,

    James

  • 0 in reply to James Evans
    Prodigy 20 points

    Hello James,

    Thank you for the information provided. I think, I need to proceed with ADS1232 as the measurement accuracy is more critical.

    Thank you.

    Regards,

    Boopathi N

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