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7Semi INA219 Triple-Channel DC Current Monitoring Sensor Breakout

7Semi INA219 Triple-Channel DC Current Monitoring Sensor Breakout

₹525.00Price
🔍 Overview
The module is based on the INA219 current/power monitor IC, a high-side current and power monitoring IC.
  • Measures:
    • Current (A)
    • Bus Voltage (V)
    • Power (W)
  • “Triple-channel” breakout means:
    • Three independent INA219 circuits on one board
    • Each channel monitors a separate load
👉 Designed for precise DC power monitoring in multi-channel systems.
⚙️ Working Principle
1. 🔌 Shunt Resistor Method (Current Measurement)
  • A precision low-value shunt resistor is placed in series with the load
  • Current flow creates a small voltage drop (shunt voltage)
Based on Ohm’s Law:
I=VshuntRshuntI = \frac{V_{shunt}}{R_{shunt}}I=Rshunt​Vshunt​​
👉 The INA219 measures this tiny voltage very accurately.
2. 📈 High-Side Measurement
  • Sensor is placed on the positive supply line (high side)
  • Allows:
    • Accurate measurement without disturbing ground reference
    • Detection of load faults
3. 🔄 Internal ADC & Processing
  • Built-in 12-bit ADC converts analog signals into digital values
  • Calculates:
    • Current
    • Bus voltage
    • Power (internally computed)
📊 Measurement Capabilities
Current
  • Typical range: up to ±3.2 A (depends on shunt resistor)
  • Resolution: up to 0.1 mA (configurable)
Voltage
  • Bus voltage range: 0V to 26V
Power
  • Calculated internally:
    P=V×IP = V \times IP=V×I
👉 No external computation required.
⚡ Electrical Characteristics
  • Supply voltage: 3V to 5.5V
  • Low current consumption
  • Operates with standard logic levels
🔗 Communication Interface
  • Interface: I²C (digital communication)
  • Default address: 0x40 (configurable via pins)
👉 In triple-channel boards:
  • Each INA219 must have different I²C address
🧠 Internal Features
✔ Programmable Gain Amplifier (PGA)
  • Amplifies small shunt voltages
  • Supports multiple ranges:
    • ±40 mV to ±320 mV
✔ Calibration Register
  • Allows scaling based on:
    • Shunt resistor value
    • Desired measurement range
✔ Built-in Power Calculation
  • Automatically computes power values
  • Reduces microcontroller load
✔ Bidirectional Measurement
  • Can measure:
    • Charging current
    • Discharging current
🔄 Triple-Channel Architecture
The breakout includes:
  • 3 × INA219 ICs
  • 3 × shunt resistors
  • Shared I²C bus
👉 Each channel:
  • Works independently
  • Can monitor separate loads simultaneously
🔧 Measurement Flow
  • Current flows through shunt resistor
  • Voltage drop is measured
  • ADC converts signal
  • Calibration applied
  • Outputs:
    • Current
    • Voltage
    • Power
🌡️ Performance Characteristics
  • High accuracy due to:
    • Precision amplifier
    • Digital calibration
  • Good stability across temperature
  • Suitable for low-current measurement
⚠️ Limitations
  • Maximum current limited by:
    • Shunt resistor rating
  • Not suitable for:
    • Very high current (>10A without external modification)
  • Accuracy depends on:
    • Proper calibration
    • PCB layout
🧩 Breakout Board Role (7Semi)
The breakout board:
  • Integrates:
    • Three INA219 ICs
    • Shunt resistors
  • Provides:
    • Easy I²C access
    • Multi-channel current monitoring
👉 Simplifies multi-load power analysis systems.
🏁 Summary
The 7Semi INA219 Triple-Channel Breakout is a multi-channel high-side current monitoring solution that:
  • Uses shunt-based measurement with precision ADC
  • Monitors current, voltage, and power simultaneously
  • Supports three independent channels
  • Provides digital output via I²C
  • Offers programmable gain and calibration
  • Is optimized for accurate DC power monitoring in embedded systems
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