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MAX6338PUB Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6338PUB Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page output toggles in one direction or the other. These resistors are not required when using the MAX6338 because hysteresis is built into the device. MAX6338 hysteresis is typically 0.3%. Undervoltage Detection Circuit The open-drain outputs of the MAX6338 can be config- ured to detect an undervoltage condition. Figure 2 shows a configuration where a low at a comparator out- put indicates an undervoltage condition, which in turn causes an LED to light. The MAX6338 can also be used in applications such as system supervisory monitoring, multivoltage level detection, and VCC bar graph monitoring (Figure 3). Window Detection A window detector circuit uses two auxiliary inputs in a configuration such as the one shown in Figure 4. 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 5). Quad Voltage Monitor in µMAX Package 6 _______________________________________________________________________________________ IN1 VCC GND IN2 IN3 IN4 OUT1 0.1 µF* OUT2 OUT3 OUT4 +5V *OPTIONAL MAX6338 V1 V2 V3 V4 D3 D1 D2 D4 IN1 VCC GND IN2 IN3 IN4 OUT1 OUT2 OUT3 OUT4 VIN (+5V) +5V MAX6338 IN1 VCC GND IN2 IN3 IN4 OUT1 OUT2 OUT3 OUT4 +5V MAX6338HUB OUT1 INPUT R2 R4 R1 R3 VTH1 = (1 + )VREF R2 R1 VTH4 = (1 + )VREF R4 R3 VREF = 1.23V OUT1 OUT4 OUT VTH1 VTH4 ∆VTH Figure 2. Quad Undervoltage Detector with LED Indicators Figure 3. VCC Bar Graph Monitoring Figure 4. Window Detection Figure 5. Output Response of Window Detector Circuit |
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