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FS1015 supply voltage 3.3V allowed?

KKohlhof

is digital bit-calibration changed, when operated only at 3.3 V?

  • +1

    Hello,

    Thanks for reaching out Renesas Engineering Community.

    Could you please specify the exact orderable part number of the sensor you are using?

    In case of FS1015, please let me inform you that this in an EOL product and we do not recommend it for new designs.

    www.renesas.com/.../fs1015-air-velocity-sensor-module

    I would suggest to you to use the FS3000 which is our active air velocity sensor module.

    https://www.renesas.com/en/products/sensor-products/flow-sensors/fs3000-air-velocity-sensor-module?gad_source=1

    Also in case you are supplying the sensor with 3.3 V I would suggest to you to supply 5 V to the sensor, since this value is the recommended one as mentioned in the datasheet:

     And back to your question now if my understanding is correct. Your question is that in case  3.3V are supplied to the sensor VDD , if the values here showing the association between the analog output volts and velocity will be different? Is that correct?

    Regards,

    IK_Renesas

  • 0

    Thanks for your fast feedback. I know FS3000 is the follow-up product, designed for VDD=3.3 V.

    But I still have mounted the "old" FS1015-1015 in my windchannel-experiment in my university-lab and tested it runnnig at only VDD=3.3 V to avoid I2C-level-shifter:
    I measured the analog output signal, that is LOWER (0.45....2.x  V) - I guess because it might come direct from an internal opamp wheatstone-bridge,operated than also only at 3.3 V.

    Yes,my question was:

    After internal ADC signal conversion: is the digital signal output (409....3686 bits) still unchanged for the range 0...7.23 m/s, even if one applies only VDD=3.3 V, because the ADC's reference voltage might be unchanged? Or, is that calibration no longer valid, if one deviates from VDD=5 V? The I would have to change over to FS3000-1015.

    Thanks for your engagement.

  • 0 in reply to KKohlhof

    Hello again,

    Sorry but the sensor won't work and operate if you supply 3.3V as VDD.

    If it is a requirement of  your system and you do not have any pin with 5V voltage select to use the FS3000 which works with 3.3V.

    Best Regards,

    Irini