Under Voltage and Over Voltage Monitor for 5V

Rajkumar Sharma
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SKU: EL124986
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This project is built using MC33161 IC, which is a universal voltage monitor intended to be used in a wide variety of voltage sensing applications. The project offers an economical solution for positive and negative voltage detection. The circuit consists of two comparator channels each with hysteresis, a unique Mode Select Input for channel programming, a pinned out 2.54 V reference, and two open collector outputs installed with LED for visual alert for under-voltage and over-voltage situations. The project is configured for a 5V supply by default. It provides a visual indication when supply is lower the 5V and over 5V. Yellow LED indicates undervoltage and Red LED indicates overvoltage. Trimmer potentiometers PR1 and PR2 were provided to adjust the Undervoltage and Overvoltage range. Both inputs can be used as independent or combined (Single Input)

Note: The board is configured to detect Undervoltage and Overvoltage for 5V Supply, however, it provides the user with multiple choices and extensive flexibility for different applications circuits and configurations. It may be used in many combinations for various options, refer to the datasheet of the chip for various options, following components R7, R9, R10, Jumper J2, Buzzer BZ1-BZ2 provided to implement various circuits.

Connections

D1 Power LED – Green
D2 Under Voltage Alert LED – Yellow
D3 Over Voltage Alert LED – RED
CN2 Pin1 VCC, Pin2 Output 1, Pin 3 Output 2, Pin 4 GND
Jumper J1 Single or Independent Input Selection (Dual)
CN1: Pin 1 = VCC, Pin 2 = Optional, Pin 3= Input 1, Pin 4 = GND, Pin 5 = Input 2, Pin 6 = GND
PR1 Trimmer Potentiometer – Under Voltage Range Adjust
PR2 Trimmer Potentiometer – Over Voltage Range Adjust

Testing the Circuit

Close Jumper J1, Connect the 5V DC power supply to CN1 Pin1 +VC and Pin6 GND. Set the Adjustable power supply to 4.5V DC and connect it to Pin 3 or Pin5 of the CN1 Connector. Turn the PR1 trimmer potentiometer carefully so the Yellow LED glows, now set the adjustable power supply to output 5.5V and turn the trimmer potentiometer PR2 such Red LED D3 should glow. Now, the project is configured and ready to be used. It is set to detect and indicate undervoltage of 4.5V and Over voltage of 5.5V. Connector CN2 can help for microcontroller interface, Output 1 and Output 2 Normally goes High or low when under/over voltage conditions are detected.

Features

Power Supply 5V DC (Range 5 to 12V DC)
Yellow LED for Under Voltage detection
Configured for 5V Detection
Red LED for Overvoltage Detection
Provides Visual Alerts when Under-Over Voltage is Detected at input 1 and Input 2
Output 1 and Output 2 for Micro-Controller Interface
LEDs can be Replaced with Audible Buzzer (Low Current Buzzer 10mA maximum)
4 X 2.5 MM Mounting Holes
PCB Dimensions 53.66 x 24.92mm

Schematic

Parts List

NO.	QNTY.	REF.	DESC.	MANUFACTURER	SUPPLIER	PART NO
1	8	BZ1,J2,BZ2,R3,R5,R7,R9,R10	DNP			DO NOT INSTALL
2	1	CN1	6 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5319-ND
3	1	CN2	4 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5317-ND
4	1	C1	0.1uF/50V SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
5	1	C2	10uF/16V SMD SIZE 1210 CERAMIC OR TANTLUM	MANUFACTURER	DIGIKEY
6	1	D1	3MM LED GREEN	AMERICAN OCTO	DIGIKEY	2460-L314GT-ND
7	1	D2	3MM LED YELLOW	AMERICAN OCTO	DIGIKEY	2460-L314YD-ND
8	1	D3	3MM LED RED	AMERICAN OCTO	DIGIKEY	2460-L314HD-ND
9	1	J1	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
10	2	PR1,PR2	5K TRIMMER POTENTIOMETER	BOURNS	DIGIKEY	3362H-502LF-ND
11	3	R1,R2,R4	470E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
12	2	R6,R8	10K 1% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
13	1	U1	MC33161 DIP8 or MSOP8	ONSEMI	DIGIKEY	MC33161DMR2GOSCT-ND
14	1	J1/SHUNT	SHUNT	SULLINS CONCT	DIGIKEY	S9001-ND