The TPS3702 combines two comparators with a precision reference voltage and a trimmed resistor divider. Only a single external input is monitored by the two comparators because the resistor divider is internal to the device. This configuration optimizes device accuracy because all resistor tolerances are accounted for in the accuracy and performance specifications. Both comparators also include built-in hysteresis that provides some noise immunity and maintains stable operation.

The SENSE input can vary from ground to 6.5V (7.0V, absolute maximum), regardless of the device supply voltage used. Although not required in most cases, for noisy applications good analog design practice is to place a 1nF to 10nF bypass capacitor at the SENSE input to reduce sensitivity to transient voltages on the monitored signal.

For the undervoltage detector, the undervoltage output is driven to logic low when the SENSE voltage drops below the undervoltage falling threshold, V_IT–(UV). When the voltage exceeds the undervoltage rising threshold, V_IT+(UV) (which is V_IT-(UV) + V_HYS), the undervoltage output goes to a high-impedance state; see Figure 5-1.

For the overvoltage detector, the overvoltage output is driven to logic low when the voltage at SENSE exceeds the overvoltage rising threshold, V_IT+(OV). When the voltage drops below the overvoltage falling threshold, V_IT–(OV) (which is V_IT+(OV) – V_HYS), the overvoltage output goes to a high-impedance state; see Figure 5-1. Together, these two comparators form a window voltage detector function as described in the Section 7.1.1 section. Also see the Section 10.1.2 section.