In PWM mode, each ESM monitors the high-pulse and low-pulse duration times its PWM inputs signal as follows:

• After a falling edge, the ESM starts monitoring the low-pulse time-duration. If the input signal remains low after exceeding the maximum low-pulse time-threshold (t_{LOW_MAX_TH}), the ESM detects a bad event and the low-pulse duration counter reinitializes. Each time the signal further exceeds the maximum threshold, the ESM detects a bad event. On the next rising edge on the input signal, the ESM starts the high-pulse time-duration monitoring
• After a rising edge, the ESM starts monitoring the high-pulse time-duration. If the input signal remains high after exceeding the maximum high-pulse time-threshold (t_{HIGH_MAX_TH}), the ESM detects a bad event and the high-pulse duration counter reinitializes. Each time the signal further exceeds the maximum threshold, the ESM detects a bad event. On the next falling edge on the input signal, the ESM starts the low-pulse time-duration monitoring.

In addition, each ESM detects a bad-event in PWM mode if one of the events that follow occurs on the deglitched signal of the related input pin nERR_MCU or nERR_SoC:

• A high-pulse time-duration which is longer than the maximum high-pulse time-threshold (t_{HIGH_MAX_TH}) that is configured in corresponding register bits ESM_MCU_HMAX[7:0] or ESM_SOC_HMAX[7:0].
• A high-pulse time-duration which is shorter than the minimum high-pulse time-threshold (t_{HIGH_MIN_TH}) that is configured in corresponding register bits ESM_MCU_HMIN[7:0] or ESM_SOC_HMIN[7:0].
• A low-pulse time-duration which is longer than the maximum low-pulse time-threshold (t_{LOW_MAX_TH}) that is configured in corresponding register bits ESM_MCU_LMAX[7:0] or ESM_SOC_LMAX[7:0].
• A low-pulse time-duration which is less than the minimum low-pulse time-threshold (t_{LOW_MIN_TH}) that is configured in register corresponding register bits ESM_MCU_LMIN[7:0] or ESM_SOC_LMIN[7:0].

Each ESM detects a good-event in PWM mode if one of the events that follow occurs on the deglitched signal of the related input pin nERR_MCU or nERR_SoC:

• A low-pulse time-duration within the minimum and maximum low-pulse time-thresholds is followed by a high-pulse time-duration within the minimum and maximum high-pulse time-thresholds, or
• A high-pulse duration within the minimum and maximum high-pulse time-thresholds is followed by a low-pulse duration within the minimum and maximum low-pulse time-thresholds

Register bits ESM_MCU_HMAX[7:0] and ESM_SOC_HMAX[7:0] set the maximum high-pulse time-threshold (t_{HIGH_MAX_TH}) for the related ESM. Use Equation 14 and Equation 15 to calculate the worst-case values for the t_{HIGH_MAX_TH}:

, in which x stands for either MCU or SoC.

ESM_MCU_HMIN[7:0] and ESM_SOC_HMIN[7:0] set the minimum high-pulse time-threshold (t_{HIGH_MIN_TH}) for the related ESM. Use Equation 16 and Equation 17 to calculate the worst-case values for the t_{HIGH_MIN_TH}:

, in which x stands for either MCU or SoC.

ESM_MCU_LMAX[7:0] and ESM_SOC_LMAX[7:0] set the maximum low-pulse time-threshold (t_{LOW_MAX_TH}) for the related ESM. Use Equation 18 and Equation 19 to calculate the worst-case values for the t_{LOW_MAX_TH}:

, in which x stands for either MCUor SoC.

ESM_MCU_LMIN[7:0] and ESM_SOC_LMIN[7:0] set the minimum low-pulse time-threshold (t_{LOW_MIN_TH}) for the related ESM. Use Equation 20 and Equation 21 to calculate the worst-case values for the t_{LOW_MIN_TH}:

, in which x stands for either MCU or SoC.

Please note that when setting up the minimum and the maximum low/high-pulse time-thresholds need to be configured such that clock tolerances from the TPS6594-Q1 and from the processor are incorporated. Equation 22, Equation 23, Equation 24, and Equation 25 are a guideline on how to incorporate these clock-tolerances:

, in which x stands for either MCU or SoC.