The following calibration methods can be used to address gain errors in the DRV8376. Room temperature calibration measures the gain error of the DRV8376 current-sense amplifiers at a single temperature, typically 25°C, and applies a fixed correction factor to adjust the measured gain to the nominal value, but this approach fails to account for temperature-induced drift, resulting in errors at -40°C and +125°C. Multitemperature calibration collects gain error measurements at multiple temperatures, such as -40°C, 25°C, and 125°C, to fit a linear model y = mx+c to the gain error data, correcting the measured gain by normalizing gain error to the nominal gain, achieving near-zero errors across the temperature range. Software-based compensation scheme to store pre-calibrated parameters (slope ( m ), intercept ( c )) in firmware, applying real-time corrections to the measured gain using the formula.

The method fits the gain error data to the linear model:

1. E(T): Gain error (%).
2. m : Slope (%/°C).
3. c : Intercept (%)

The method assumes the measured gain is:

Calibration corrects the gain to the nominal value:

The corrected gain error is:

Figure 3-3 shows the calibrated gain error of DRV8376 at 24V and 48V supplies using the previous methods.

Figure 3-3 Calibrated Gain Error