Ricoh R3111x Series Radar Detector User Manual


 
R3111x
25
Voltage level Indicator Circuit (lighted when the power runs out)
(Nch Open Drain Output)
R3111xxxxA
Series
V
DD
GND
OUT
V
DD
Detector Threshold Adjustable Circuit
(Nch Open Drain Output)
R3111xxxxA
Series
GND
V
DD
Rb
V
DD
C
Ra
OUT
+
Adjusted Detector Threshold
=(VDET)×(Ra+Rb)/Rb
Hysteresis Voltage
=(VHYS)×(Ra+Rb)/Rb
) If the value of Ra is set excessively large, voltage
drop may occur caused by the supply current of IC
itself, and detector threshold may vary.
Window Comparator Circuit
(Nch Open Drain Output)
R3111xxxxA
Series
V
DD
GND
OUT
V
DD
R3111xxxxA
Series
V
DD
GND
OUT
V
DET
1
WC_OUT
V
DET
2
V
DD
V
DET
1
GND
WC_OUT
V
DET
2
GND
Over-charge Preventing Circuit
R3111xxxxC
Series
V
DD
GND
OUT
R4R2
R1
R3
Light
Solar Battery
D1
Load