How to Use Power MUX Click: Examples, Pinouts, and Specs

Power MUX Click is a power management module designed to facilitate the selection and seamless switching of multiple power sources to a single output. This component ensures efficient power distribution in electronic circuits, making it ideal for applications requiring redundancy or prioritization of power sources. It is commonly used in battery-powered devices, uninterruptible power supplies (UPS), and systems requiring automatic power source selection.

• Battery backup systems
• Redundant power supply systems
• Portable electronics with multiple power inputs
• IoT devices requiring uninterrupted power
• Power source prioritization in embedded systems

The Power MUX Click module is built to handle a wide range of power management tasks. Below are its key technical details:

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: Matches the selected input voltage
• Maximum Output Current: 3A (continuous)
• Switching Mechanism: Automatic or manual source selection
• Control Interface: GPIO or I2C (depending on configuration)
• Operating Temperature: -40°C to +85°C
• PCB Dimensions: 28.6mm x 25.4mm

The Power MUX Click module features a standard 8-pin interface. Below is the pinout description:

The Power MUX Click module is straightforward to use in a circuit. Follow the steps below to integrate it into your design:

1. Connect Power Sources:
   • Connect the primary power source to the VIN1 pin.
   • Connect the secondary power source to the VIN2 pin.
2. Connect Output:
   • Connect the load to the VOUT pin.
3. Ground Connection:
   • Ensure all components share a common ground by connecting to the GND pin.
4. Source Selection:
   • Use the SEL pin to select the desired power source:
     • Set SEL HIGH to select VIN1.
     • Set SEL LOW to select VIN2.
5. Enable Output:
   • Set the EN pin HIGH to enable the output voltage.

• Ensure the input voltage does not exceed the specified range (2.7V to 5.5V).
• Do not exceed the maximum output current of 3A to avoid damage.
• Use decoupling capacitors near the input and output pins to reduce noise.
• If using the I2C interface, ensure proper pull-up resistors are connected to the SDA and SCL lines.

Below is an example of how to use the Power MUX Click module with an Arduino UNO to switch between two power sources:

// Define pin connections for Power MUX Click
#define SEL_PIN 7  // Pin connected to SEL (source selection)
#define EN_PIN 8   // Pin connected to EN (enable output)

void setup() {
  // Initialize pins as outputs
  pinMode(SEL_PIN, OUTPUT);
  pinMode(EN_PIN, OUTPUT);

  // Enable the Power MUX Click output
  digitalWrite(EN_PIN, HIGH);

  // Select the primary power source (VIN1)
  digitalWrite(SEL_PIN, HIGH);
}

void loop() {
  // Example: Toggle between power sources every 5 seconds
  digitalWrite(SEL_PIN, LOW);  // Switch to secondary power source (VIN2)
  delay(5000);                 // Wait for 5 seconds
  digitalWrite(SEL_PIN, HIGH); // Switch back to primary power source (VIN1)
  delay(5000);                 // Wait for 5 seconds
}

1. No Output Voltage:

   • Ensure the EN pin is set HIGH to enable the output.
   • Verify that at least one power source is connected and within the specified voltage range.

2. Output Voltage Fluctuations:

   • Check for loose connections or insufficient decoupling capacitors.
   • Ensure the load does not exceed the maximum output current of 3A.

3. Module Overheating:

   • Verify that the input voltage and current are within the specified limits.
   • Ensure proper ventilation and heat dissipation around the module.

4. I2C Communication Issues:

   • Confirm that pull-up resistors are connected to the SDA and SCL lines.
   • Check the I2C address and ensure it matches the configuration in your code.

Q1: Can I use the Power MUX Click with only one power source?
A1: Yes, you can connect a single power source to either VIN1 or VIN2. Ensure the SEL pin is set accordingly.

Q2: What happens if both power sources are active?
A2: The module will select the source based on the SEL pin state. If SEL is HIGH, VIN1 is selected; if LOW, VIN2 is selected.

Q3: Is the switching between power sources seamless?
A3: Yes, the module is designed for seamless switching, minimizing disruptions to the output voltage.

Q4: Can I control the module using a microcontroller?
A4: Absolutely! The SEL and EN pins can be controlled via GPIO, and the I2C interface allows for advanced control and monitoring.