Rainbow Electronics MAX6338 - Manual (Page 6)

MAX6338
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 V
CC 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
(V
TH1 and V TH4 ) of the window detector circuit. Window
width ( ∆V
TH ) is the difference between the threshold
voltages (Figure 5).
Quad Voltage Monitor in µMAX Package
6 _______________________________________________________________________________________
IN1
V CC
GND
IN2
IN3
IN4
OUT1
0.1 µF*
OUT2
OUT3
OUT4
+5V
*OPTIONAL
MAX6338
V1
V2
V3
V4
D3
D1
D2
D4
IN1
V CC
GND
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
V IN (+5V)
+5V
MAX6338
IN1
V
CC
GND
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
+5V
MAX6338HUB
OUT1
INPUT
R2
R4
R1
R3
V
TH1
= ( 1 + ) V
REF
R2
R1
V TH4 =
(
1 +
)
V REF
R4
R3
V
REF
= 1.23V
OUT1
OUT4
OUT
V TH1
V TH4
∆V
TH
Figure 2. Quad Undervoltage Detector with LED Indicators Figure 3. V CC Bar Graph Monitoring
Figure 4. Window Detection Figure 5. Output Response of Window Detector Circuit