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TMAG5173-Q1: Is it possible to measure up to the 36xharmonic of a 50Hz system and create a spectrum visualization?

Johann Stocker
Prodigy 10 points
Part Number: TMAG5173-Q1
Other Parts Discussed in Thread: TMAG5170

Tool/software:

Hello! I'm seraching for a magnetic sensor with high analog bandwidth for measuring flux of ~15 ... 100mT(or less) @ up to ~8kHz and with SPI or I2C. I want to measure up to the 36xharmonics of a 50Hz system and create a spectrum visualization. It has to have a temperature rage of minimum -40°C ... +85°C and work at 3V3, 3V6 or 5V and is available on the market. Is this possible with TMAG5173-Q1 or should i use another sensor? Thank you!

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    TI__Genius 15770 points

    Johann,

    TMAG5170 is probably your best bet.  This device operates using SPI and supports VCC=2.3V-5.5V. TMAG5173-Q1 would work under most conditions you specified, but cannot operate with the 5V supply voltage.  TMAG5170 can be configured to sample a variety of combinations of X,Y,and Z axes.  Generally speaking, it may be configured so that the composite sample time for all axes sampled is t= 50us +25us*(n-1), where n is the total number of conversions needed.  For instance, if using the XZX pattern at 32x averaging, there would be n=3*32 conversions required, and the expected time for that sample would be about 2.4ms.  

    Averaging is generally done to improve SNR, but can be omitted if necessary, especially when the input magnetic field is much stronger than the input referred noise of the device.  In your case, at 8kHz sample rate, you need to be able to read out your measurements every 125us.  If sampling X,Y, and Z axes, the fastest rate is 100us for all three at 1x averaging and T_RATE = 1.

    Thanks,

    Scott