參數(shù)資料
型號(hào)： R3111Q271B
廠商： Ricoh Co., Ltd.
英文描述： LOW VOLTAGE DETECTOR
中文描述： 低電壓檢測(cè)
文件頁(yè)數(shù)： 14/44頁(yè)
文件大?。?/td> 1170K
代理商： R3111Q271B
R3111x
OPERATION
Operation of R3111xxxxA
14
Vref
Ra
Rb
Rc
V
DD
OUT
GND
Tr.1
Nch
Comparator
OUT pin should be pulled-up to
V
DD
or an external voltage level.
Block Diagram (R3111xxxxA)
1
3
5
A
B
t
PLH
2
4
GND
GND
V
DDL
-
V
DET
+V
DET
Detector Threshold
Supply Voltage
(V
DD
)
Released Voltage
Minimum Operating Voltage
Pull-up Voltage
Detector Threshold
Hysteresis
Output Voltage
(V
OUT
)
Step
1
2
3
4
5
Comparator (
+
)
Pin Input Voltage
I
II
II
II
I
Comparator Output
H
L
Indefinite
L
H
Tr.1
OFF ON Indefinite ON OFF
Output Tr.
Nch
OFF ON Indefinite ON OFF
×
V
DD
Ra
+
Rb
+
Rc
I
Rb
+
Rc
II
×
V
DD
Rb
Ra
+
Rb
Operation Diagram
Explanation of operation
Output
Delay Time
Step 1. The output voltage is equal to the pull-up voltage.
Step 2. At Point “A”, Vref
>
=
V
DD
×
(Rb
+
Rc)/(Ra
+
Rb
+
Rc) is true, as a result, the output of comparator is reversed
from "H" to "L", therefore the output voltage becomes the GND level. The voltage level of Point A means
a detector threshold voltage (
V
DET
).
Step 3. When the supply voltage is lower than the minimum operating voltage, the operation of the output
transistor becomes indefinite. The output voltage is equal to the pull-up voltage.
Step 4. The output Voltage is equal to the GND level.
Step 5. At Point “B”, Vref
<
=
V
DD
×
Rb/(Ra
+
Rb) is true, as a result, the output of comparator is reversed from "L" to
"H", then the output voltage is equal to the pull-up voltage. The voltage level of Point B means a released
voltage (
+
V
DET
).
) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.
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