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TIDUEB2A July 2022 – July 2022

2.2.20 Input Comparators

Two comparators are included to monitor VIN_FLT and PS_ID. These signals can be used to provide interrupt generation for the MCU when a specific type of adapter has been inserted or if an input adapter voltage threshold has been met. The TLV7031 nano-power, low-voltage comparator is used to provide a small footprint and low power draw while waiting for input events. Because these devices are powered by the battery when no input adapter is present, the ultra-low quiescent current of 315 nA is a key design feature.

Figure 2-9 Input Capacitor Schematic

The voltage setting and hysteresis for these comparators can be calculated and adjusted according to
Equation 7.

V_{T H} = V_{C C} \times \frac{R 100}{R 97 | | R 101 + R 100}

V_{T L} = V_{C C} \times \frac{R 100 | | R 101}{R 97 + R 100 | | R 101}

V_{T H} = 3.3 V \times \frac{82.5 k Ω}{100 k Ω | | 3.57 M Ω + 82.5 k Ω} = 1.51 V

Equation 7.

V_{T L} = 3.3 V \times \frac{82.5 k Ω | | 3.57 M Ω}{100 k Ω + 82.5 k Ω | | 3.57 M Ω} = 1.47 V