MAX6338 データシートの表示（PDF） - Maxim Integrated
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MAX6338 Datasheet PDF : 8 Pages
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Quad Voltage Monitor in µMAX Package
+5V
VCC
V1 IN1
V2 IN2
MAX6338
V3 IN3
V4 IN4
OUT1
OUT2
OUT3
OUT4
GND
0.1µF*
+5V
VCC
D1
VIN (+5V)
IN1
OUT1
IN2 MAX6338 OUT2
D2
D3
IN3
OUT3
D4
IN4
OUT4
GND
*OPTIONAL
Figure 2. Quad Undervoltage Detector with LED Indicators
Figure 3. VCC Bar Graph Monitoring
( ) VTH1 =
1
+
R2
R1
VREF
VREF = 1.23V R2
R1
INPUT
R4
R3
( ) VTH4 =
1 + R4
R3
VREF
+5V
VCC
IN1
OUT1
IN2 MAX6338HUB OUT2
IN3
OUT3
IN4
OUT4
GND
OUT1
OUT1
VTH1
OUT4
VTH4
OUT
∆VTH
Figure 4. Window Detection
Figure 5. Output Response of Window Detector Circuit
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).
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