JAJSU58 July 2024 TMCS1133-Q1
PRODUCTION DATA
Offset error is the deviation from the ideal output with zero input current and most often limits measurement accuracy at low input current levels. Offset error can be referred to the output as offset voltage error or referred to the input as offset current error. When divided by device sensitivity, S, output voltage offset error VOE is input referred as input current offset error IOS (see Equation 4). Offset error referred to the input (RTI) allows for more direct comparisons or offset error with input current. Regardless of whether offset error is referred to the input as current offset error IOS, or to the output as voltage offset error VOE, offset error is a single error source and must only be included once in either input-referred or output-referred error calculations.
As shown in Figure 7-1, the output voltage offset error VOE of the TMCS1133-Q1 is the difference between the zero current output voltage VOUT,0A and the zero current output reference voltage VREF (see Equation 5).
The output offset error VOE includes magnetic offset error in the Hall sensor, offset voltage error in the signal chain, and offset error in the internal zero current output reference voltage VREF.
Offset drift is the change in the offset as a function of temperature T. Output offset drift is reported in µV/°C. To calculate offset error at any given temperature, multiply the offset drift by the change in temperature and add that value to the offset error at 25°C (see Equation 6).
where