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RV5VH3××
40
DOUT
RV5VH3××
Pull-up
Output Tr.
–
+
Vref
R1
R2
R3
Tr.1
3
8
V
DD
The Voltage Detector can operate by an input voltage to the VDD pin. The detector threshold and the reset voltage
are internally adjusted by trimmed resistors and the VD monitors VDD pin voltage.
The D
OUT is Nch-opendrain output and a pull up resistor is necessary.
Oepration Diagram
The output is pulled up to V
DD voltage
• Voltage Detector
A
B
Reset Voltage
Detector Threshold
GND
GND
Output Voltage
1 2 3 4 5
Hysteresis Range
+VDET
–V
DET
Step Step 1 Step 2 Step 3 Step 4 Step 5
Comparator(+) Pin
Input Voltage
A B B B A
Comparator Output
H L L L H
Tr. 1 OFF ON ON ON OFF
Output Tr.
OFF ON
Indefinite
ON OFF
Step 1. Output Voltage is equal to Pull-up Voltage
Step 2. When Input voltage(V
DD) reaches to the state of VREF≥VDD×(R2+R3)/(R1+R2+R3) at point A, the output of the comparator is reversed, so that the
output voltage becomes to GND.
Step 3. Output Voltage becomes indefinite when Power Source Voltage (V
DD) is smaller than Minimum Operating Voltage. When the output is pulIed up,
Output becomes pull-up voltage and GND.
Step 4. Output Voltage becomes to GND.
Step 5. When Input voltage(V
DD) reaches to the state of VREF≤VDD×R2/(R1+R2) at point B, the output of the comparator is reversed, so that the output voltage
becomes to pull-up voltage.
A :
R2+R3
×
VDD
R1+R2+R3
B :
R2
×
V
DD
R1+R2+R3