How to Use LI-ION CHARGER WITH PROTECTION: Examples, Pinouts, and Specs

The LI-ION CHARGER WITH PROTECTION (Manufacturer: SOLDERED, Part ID: 333014) is a compact and efficient device designed to safely charge lithium-ion batteries. It incorporates advanced protection mechanisms to prevent overcharging, overheating, and short circuits, ensuring the longevity and safety of the battery. This component is ideal for applications requiring reliable and safe battery charging, such as portable electronics, IoT devices, and DIY projects.

• Charging single-cell lithium-ion or lithium-polymer batteries.
• Battery-powered devices like wearables, drones, and handheld gadgets.
• DIY electronics projects requiring safe and efficient battery management.
• Integration into IoT devices for uninterrupted power supply.

• Input Voltage Range: 4.5V to 6V (via micro-USB or solder pads)
• Charging Current: 1A (default, adjustable with external resistor)
• Battery Compatibility: Single-cell lithium-ion or lithium-polymer batteries (3.7V nominal, 4.2V fully charged)
• Protection Features:
  • Overcharge protection
  • Over-discharge protection
  • Short-circuit protection
  • Overcurrent protection
• LED Indicators:
  • Red LED: Charging in progress
  • Green LED: Charging complete
• Operating Temperature: -10°C to 60°C
• Dimensions: 25mm x 19mm x 5mm

The LI-ION CHARGER WITH PROTECTION has the following pin configuration:

1. Power Input: Connect a 5V power source to the VCC pin. This can be done via the micro-USB port or solder pads.
2. Battery Connection: Connect the positive terminal of the lithium-ion battery to the BAT+ pin and the negative terminal to the BAT- pin.
3. Charging Current Adjustment (Optional): To modify the default charging current (1A), connect an external resistor to the PROG pin. Refer to the datasheet for resistor values corresponding to desired current levels.
4. LED Indicators: Monitor the charging status using the onboard LEDs:
   • Red LED: Charging in progress.
   • Green LED: Charging complete.

• Ensure the input voltage does not exceed 6V to avoid damaging the charger.
• Use only single-cell lithium-ion or lithium-polymer batteries with a nominal voltage of 3.7V.
• Avoid shorting the BAT+ and BAT- pins, as this may damage the battery or charger.
• Place the charger in a well-ventilated area to prevent overheating during operation.
• If integrating with an Arduino UNO or other microcontrollers, ensure proper isolation between the charger and the microcontroller's power supply.

If you want to monitor the charging status using an Arduino UNO, you can connect the LED pins to digital input pins and use the following code:

// Define pins for the charger LEDs
const int redLED = 2;  // Connect the red LED pin to Arduino digital pin 2
const int greenLED = 3; // Connect the green LED pin to Arduino digital pin 3

void setup() {
  pinMode(redLED, INPUT);  // Set red LED pin as input
  pinMode(greenLED, INPUT); // Set green LED pin as input
  Serial.begin(9600); // Initialize serial communication for debugging
}

void loop() {
  // Read the status of the LEDs
  bool isCharging = digitalRead(redLED);  // Red LED indicates charging
  bool isCharged = digitalRead(greenLED); // Green LED indicates charging complete

  // Print the charging status to the Serial Monitor
  if (isCharging) {
    Serial.println("Battery is charging...");
  } else if (isCharged) {
    Serial.println("Battery is fully charged!");
  } else {
    Serial.println("No charging activity detected.");
  }

  delay(1000); // Wait for 1 second before checking again
}

1. The charger does not power on.

   • Solution: Verify that the input voltage is within the specified range (4.5V to 6V). Check the connections to the VCC and GND pins.

2. The battery is not charging.

   • Solution: Ensure the battery is properly connected to the BAT+ and BAT- pins. Check the battery's voltage to confirm it is not below the minimum threshold (typically 2.5V).

3. The charger overheats during operation.

   • Solution: Ensure adequate ventilation around the charger. If the charging current is too high, reduce it by adjusting the resistor on the PROG pin.

4. The LEDs are not functioning.

   • Solution: Check the LED connections and ensure the charger is receiving power. If the LEDs are damaged, consider replacing them.

Q1: Can I use this charger for multi-cell batteries?
A1: No, this charger is designed specifically for single-cell lithium-ion or lithium-polymer batteries.

Q2: How do I adjust the charging current?
A2: Connect an external resistor to the PROG pin. Refer to the datasheet for the resistor value corresponding to your desired current.

Q3: Is it safe to leave the battery connected after it is fully charged?
A3: Yes, the charger includes overcharge protection, so it is safe to leave the battery connected.

Q4: Can I power the charger with a solar panel?
A4: Yes, as long as the solar panel provides a stable voltage within the 4.5V to 6V range.

This documentation provides a comprehensive guide to using the LI-ION CHARGER WITH PROTECTION (SOLDERED, Part ID: 333014). For further assistance, refer to the manufacturer's datasheet or contact technical support.