TMCS1100 datasheet(16/50 Pages) TI1

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PSRR

PSRR * (V

(%)

100% *

· u '

OS,25 C

OS,drift

, T

/ S

OUT,0A

REF

TMCS1100

SBOS820A – SEPTEMBER 2019 – REVISED JUNE 2020

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Accuracy Parameters (continued)

The output voltage offset error of the TMCS1100 is the error in the zero current output voltage from the VREF

pin voltage as in Equation 3.

where

•

VOUT,0A is the device output voltage with zero input current.

(3)

The offset error includes the magnetic offset of the Hall sensor and any offset voltage errors of the signal chain.

The input referred (RTI) offset error is the output voltage offset error divided by the sensitivity of the device,

shown in Equation 4. Refer the offset error to the input of the device to allow for easier total error calculations

and direct comparison to input current levels. No matter how the calculations are done, the error sources

quantified by VOE and IOS are the same, and should only be included once for error calculations.

(4)

Offset error drift is the change in the input-referred offset error per degree Celsius change in ambient

temperature. This parameter is reported in µA/°C. To convert offset drift to an absolute offset for a given change

in temperature, multiply the drift by the change in temperature and convert to percentage, as in Equation 5.

where

•

IOS,drift is the specified input-referred device offset drift.

•

ΔT is the temperature range from 25°C.

(5)

8.1.3 Nonlinearity Error

Nonlinearity is the deviation of the output voltage from a linear relationship to the input current. Nonlinearity

voltage, as shown in Figure 25, is the maximum voltage deviation from the best-fit line based on measured

parameters, calculated by Equation 6.

VNL = VOUT,MEAS – (IMEAS × Sfit + VOUT,0A)

where

•

VOUT,MEAS is the voltage output at maximum deviation from best fit.

•

IMEAS is the input current at maximum deviation from best fit.

•

Sfit is the best-fit sensitivity of the device.

•

VOUT,0A is the device zero current output voltage.

(6)

Nonlinearity error (eNL) for the TMCS1100 is the nonlinearity voltage specified as a percentage of the full-scale

output range (VFS), as shown in Equation 7.

(7)

8.1.4 Power Supply Rejection Ratio

Power supply rejection ratio (PSRR) is the change in device offset due to variation of supply voltage from the

nominal 5 V. The error contribution at the input current of interest can be calculated by Equation 8.

where

•

VS is the operational supply voltage.

•

S is the device senstivity.

(8)

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