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How to Use Adafruit bd25185 60106: Examples, Pinouts, and Specs

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Introduction

The Adafruit BQ25185 6106 is a highly efficient, compact, and versatile power management IC designed for battery charging and regulation. Manufactured by Adafruit, this component is ideal for applications requiring precise battery management, such as wearable devices, IoT gadgets, and portable electronics. It supports single-cell Li-Ion and Li-Polymer batteries and integrates multiple features, including a linear charger, a regulated output, and battery protection.

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Explore Projects Built with Adafruit bd25185 60106

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of lab: A project utilizing Adafruit bd25185 60106 in a practical application
Battery-Powered Smart Light with Proximity Sensor and OLED Display using Adafruit QT Py RP2040
This circuit is a portable, battery-powered system featuring an Adafruit QT Py RP2040 microcontroller that interfaces with an OLED display, a proximity sensor, an accelerometer, and an RGB LED strip. The system is powered by a lithium-ion battery with a step-up boost converter to provide 5V for the LED strip, and it includes a toggle switch for power control. The microcontroller communicates with the sensors and display via I2C.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of wearable final: A project utilizing Adafruit bd25185 60106 in a practical application
Battery-Powered Smart Sensor Hub with Adafruit QT Py RP2040
This circuit features an Adafruit QT Py RP2040 microcontroller interfaced with an APDS9960 proximity sensor, an MPU6050 accelerometer and gyroscope, and an OLED display via I2C communication. It also includes a buzzer controlled by the microcontroller and is powered by a 3.7V LiPo battery with a toggle switch for power control.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of iot task 2: A project utilizing Adafruit bd25185 60106 in a practical application
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This circuit features a Raspberry Pi 4B as the central processing unit, interfaced with an Adafruit ADS1115 16-bit I2C ADC for analog-to-digital conversion and a 0.96" OLED display for visual output. The ADC is connected to a current sensor for measuring electrical current, with the sensor's output connected to the ADC's AIN0 pin and the burden resistor connected to AIN1. The Raspberry Pi communicates with both the ADC and the OLED display over the I2C bus, using GPIO2 (SDA) and GPIO3 (SCL) for data exchange.
Cirkit Designer LogoOpen Project in Cirkit Designer
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ESP32-Based Smart Weather Station with LED Display and Multiple Sensors
This circuit is a multi-sensor data acquisition system using an ESP32 microcontroller. It integrates various sensors including a BH1750 light sensor, BMP280 pressure sensor, DS3231 RTC, and DS18B20 temperature sensor, and displays data on a series of MAX7219 8x8 LED matrices. The system is powered via USB and includes a green LED indicator.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Wearable electronics
  • Internet of Things (IoT) devices
  • Portable medical devices
  • Low-power consumer electronics
  • Battery-powered sensors

Technical Specifications

The Adafruit BQ25185 6106 offers a range of features tailored for efficient battery management. Below are the key technical details:

Key Technical Details

Parameter Value
Input Voltage Range 3.6V to 6.6V
Battery Charge Voltage Configurable up to 4.2V
Charge Current Programmable up to 500mA
Quiescent Current 700nA (typical)
Output Voltage (LDO Mode) 1.8V to 3.3V (configurable)
Battery Protection Overvoltage, undervoltage, and short-circuit
Package Type 12-pin DFN

Pin Configuration and Descriptions

The BQ25185 6106 features a 12-pin DFN package. Below is the pinout description:

Pin Number Pin Name Description
1 PMID Input/output for the power path
2 SYS System output voltage
3 BAT Battery connection
4 TS Temperature sense input
5 ISET Charge current programming
6 GND Ground
7 ILIM Input current limit programming
8 VIN Input power supply
9 CE Charge enable (active low)
10 STAT Charge status indicator
11 EN_LDO Enable pin for LDO output
12 LDO Low-dropout regulator output

Usage Instructions

The Adafruit BQ25185 6106 is straightforward to use in battery-powered circuits. Below are the steps and considerations for integrating it into your design.

How to Use the Component in a Circuit

  1. Power Input: Connect the VIN pin to a power source (3.6V to 6.6V). Ensure the input voltage is within the specified range.
  2. Battery Connection: Attach the positive terminal of the battery to the BAT pin and the negative terminal to GND.
  3. Charge Current Configuration: Use a resistor on the ISET pin to set the desired charge current. Refer to the datasheet for resistor values.
  4. System Output: Connect the SYS pin to the load that requires regulated power.
  5. LDO Output: If using the LDO, connect the EN_LDO pin to enable the output and configure the desired voltage.
  6. Temperature Monitoring: Attach a thermistor to the TS pin for battery temperature monitoring.
  7. Charge Enable: Use the CE pin to enable or disable charging. Pull it low to enable charging.

Important Considerations and Best Practices

  • Thermal Management: Ensure proper heat dissipation, especially when operating at high charge currents.
  • Battery Safety: Use a battery with built-in protection circuitry for added safety.
  • Input Voltage: Avoid exceeding the maximum input voltage of 6.6V to prevent damage.
  • Programming Resistors: Use precise resistors for ISET and ILIM to ensure accurate current settings.

Example: Using with Arduino UNO

The BQ25185 6106 can be interfaced with an Arduino UNO to monitor the charge status. Below is an example code snippet:

// Example code to monitor the charge status of the BQ25185 6106
// Connect the STAT pin of the BQ25185 to Arduino digital pin 2

const int statPin = 2; // STAT pin connected to digital pin 2

void setup() {
  pinMode(statPin, INPUT); // Set STAT pin as input
  Serial.begin(9600);      // Initialize serial communication
}

void loop() {
  int chargeStatus = digitalRead(statPin); // Read the STAT pin state

  if (chargeStatus == LOW) {
    // STAT pin LOW indicates charging is in progress
    Serial.println("Battery is charging...");
  } else {
    // STAT pin HIGH indicates charging is complete or not active
    Serial.println("Battery is not charging.");
  }

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

Troubleshooting and FAQs

Common Issues and Solutions

  1. Component Overheating

    • Cause: High charge current or insufficient heat dissipation.
    • Solution: Reduce the charge current or improve thermal management (e.g., add a heatsink).
  2. Battery Not Charging

    • Cause: Incorrect resistor values on ISET or ILIM pins, or CE pin not pulled low.
    • Solution: Verify resistor values and ensure the CE pin is properly configured.
  3. LDO Output Not Enabled

    • Cause: EN_LDO pin not connected or improperly configured.
    • Solution: Pull the EN_LDO pin high to enable the LDO output.
  4. Input Voltage Out of Range

    • Cause: VIN exceeds 6.6V or drops below 3.6V.
    • Solution: Use a regulated power supply within the specified range.

FAQs

Q: Can I use the BQ25185 6106 with a 3.3V input?
A: No, the minimum input voltage is 3.6V. Using a lower voltage may result in improper operation.

Q: How do I configure the charge termination current?
A: The charge termination current is set using the ISET pin. Refer to the datasheet for the appropriate resistor value.

Q: Is the BQ25185 6106 suitable for multi-cell batteries?
A: No, this component is designed for single-cell Li-Ion or Li-Polymer batteries only.

Q: Can I disable the charging function?
A: Yes, pull the CE pin high to disable charging.

By following this documentation, users can effectively integrate the Adafruit BQ25185 6106 into their projects and troubleshoot common issues.