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MAX6709KUB Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6709KUB Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 13 page resistors are not required when using the MAX6709/ MAX6714 because hysteresis is built into the device. MAX6709/MAX6714 hysteresis is typically 0.3% of the threshold voltage. Undervoltage Detection Circuit The open-drain outputs of the MAX6709/MAX6714 can be configured to detect an undervoltage condition. Figure 3 shows a configuration where an LED turns on when the comparator output is low, indicating an undervoltage condition. The MAX6709/MAX6714 can also be used in applica- tions such as system supervisory monitoring, multivolt- age level detection, and VCC bar graph monitoring (Figure 4). Window Detection A window detector circuit uses two auxiliary inputs in a configuration such as the one shown in Figure 5. External resistors R1–R4 set the two threshold voltages (VTH1 and VTH4) of the window detector circuit. Window width ( ∆VTH) is the difference between the threshold voltages (Figure 6). Adjustable Input The MAX6709 offers several monitor options with adjustable reset thresholds. The MAX6714 has three monitored inputs with adjustable thresholds. The thresh- old voltage at each adjustable IN_ (PFI_) input is typically 0.62V. To monitor a voltage >0.62V, connect a resistor- divider network to the circuit as shown in Figure 7. VINTH = 0.62V ✕ (R1 + R2) / R2 Low-Voltage, High-Accuracy Quad, Voltage Monitors in µMAX Package _______________________________________________________________________________________ 9 IN1 VCC GND IN2 IN3 IN4 PWRGD1 PWRGD2 PWRGD3 PWRGD4 5V MAX6709 V1 V2 V3 V4 Figure 3. Quad Undervoltage Detector with LED Indicators D3 D1 D2 D4 IN1 VCC GND IN2 IN3 IN4 PWRGD1 PWRGD2 PWRGD3 PWRGD4 VIN (5V) 5V MAX6709 Figure 4. VCC Bar Graph Monitoring IN1 VCC GND IN2 IN3 IN4 PWRGD1 PWRGD2 PWRGD3 PWRGD4 5V MAX6709 OUT INPUT R2 R4 R1 R3 VTH1 = (1 + )VREF R2 R1 VTH4 = (1 + )VREF R4 R3 VREF = 0.62V Figure 5. Window Detection PWRGD1 PWRGD4 OUT VTH1 VTH4 ∆VTH Figure 6. Output Response of Window Detector Circuit |
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