ICL8211 Datasheet, PDF (11/14 Pages) Intersil Corporation – Programmable Voltage Detectors

ICL8211, ICL8212
V+
R₃
1
8
R₂
2
7
3
6
4
5
R₁
V_O
Low trip voltage
V_TR1 = ^{(R1 + R2) x 1.15 + 0.1V}
R₁
High trip voltage
volts
V_TR2 =
(R₁ + R₂ + R₃)
R₁
x 1.15V
FIGURE 27A.
V+
R_Q
1
8
R_S
2
7
3
6
4 FIG 7
5
R_P
V_O
R₂
150kΩ
R₃
(NOTE 1)
1
8
2 ICL8211 7
3
6
4
5
LED
LAMP
NOTE 1. R₃ OPTIONAL
FIGURE 28. LOW VOLTAGE BATTERY INDICATOR
R₃
S₁
1
2
R₂
3
4
R₁
8
7
R_L
6
5
V+
OUTPUT
Low trip voltage
V_TR1 =
R_QR_S
(R_Q + R_S)
+ R_P
1
x
x 1.15V
R_P
High trip voltage
V_TR2 =
(R_P + R_Q)
R_P
x 1.15V
FIGURE 27B.
FIGURE 29A.
OFF
B
OFF
ON
ON
ON
OFF
V_TR1
V_TR2
SUPPLY VOLTAGE
FIGURE 27C.
FIGURE 27. TWO ATERNATIVE VOLTAGE DETECTION
CIRCUITS EMPLOYING HYSTERESIS TO
PROVIDE PAIRS OF WELL DEFINED TRIP
VOLTAGES
ON
A
OFF
V_TR1
V_NOM
V_TR2
SUPPLY VOLTAGE
FIGURE 29B.
FIGURE 29. NON-VOLATILE LOW VOLTAGE INDICATOR
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