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TMCS1100

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SBOS820 – SEPTEMBER 2019

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Feature Description (continued)

9.3.3.1 Temperature Stability

System calibration at room temperature is a common practice for many applications. This initial calibration results

in a very accurate measurement under the conditions at which calibration was performed because individual

components of the total error are eliminated. As the ambient temperature changes as a result of device self-

heating or environmental conditions, any drift in critical system parameters will reintroduce these errors into the

system performance. For many systems, this drift in performance across temperature is the primary contributor

to performance degradation at the system level. These variations in component parametric performance must be

accounted for in total system error calculations. The TMCS1100 includes a proprietary temperature

compensation technique, and results in best in industry parametric drift across the full temperature range. A zero-

drift signal chain architecture and Hall sensor temperature stabilization methods enable stable sensitivity and

minimize offset errors across temperature, and drastically improves system-level performance across the

required operating conditions.

Figure 3 shows the offset error across the full device ambient temperature range. Figure 4 shows the typical

sensitivity. There are no other external components introducing errors sources; therefore, the high intrinsic

accuracy and stability over temperature directly translates to system-level performance. As a result of this high

precision, even a system with no calibration can reach < 1% of total error current-sensing capability.

Figure 3. Offset Error Drift Across Temperature

Figure 4. Sensitivity Drift Across Temperature