7Semi 5A Analog INA169 DC Current Sensor Breakout
🔌 7Semi 5A Analog INA169 DC Current Sensor Breakout — Technical Information
🔍 Overview
The module is based on the INA169 current shunt monitor IC, an analog current sensing device designed to measure DC current.
Measures:
Current up to ~5A (depends on shunt resistor)
Output:
Analog voltage proportional to current
Type:
High-side current sensing
👉 Suitable for power monitoring and load current measurement.
⚙️ Working Principle
⚡ Shunt Resistor Current Sensing
1. 🔩 Current Flow Through Shunt
A low-value precision resistor (shunt) is placed in series with load
Current flowing → small voltage drop across resistor
2. 📐 Ohm’s Law Relationship
V=I×RV = I \times RV=I×R
VVV = voltage across shunt
III = current
RRR = shunt resistance
3. 🔍 Voltage Monitoring
The INA169 IC measures this small voltage difference
4. 📡 Current-to-Voltage Conversion
Internal circuitry converts measured voltage → output current
External resistor converts it into output voltage
👉 Final output voltage is proportional to load current.
📊 Measurement Characteristics
Current range: up to ~5A (module dependent)
Measurement type: DC current
Output: analog voltage proportional to current
Output Relationship
Vout=Iload×KV_{out} = I_{load} \times KVout=Iload×K
KKK depends on:
Shunt resistor
Load resistor
⚡ Electrical Characteristics
Supply voltage: 2.7V to 60V (wide range capability of IC)
Low quiescent current
High-side sensing capability
🔗 Output Interface
Analog Output
Provides continuous voltage signal
Requires:
ADC (Analog-to-Digital Converter)
Signal Behavior
Output increases linearly with current
No digital communication required
🧠 Internal Features
✔ High-Side Current Sensing
Measures current on:
Positive supply line
Does not disturb ground reference
✔ Wide Common-Mode Voltage Range
Can measure current in systems with:
High supply voltage
✔ Low Offset Voltage
Improves measurement accuracy
✔ Simple External Components
Requires only:
Shunt resistor
Output resistor
🔄 Operating Behavior
✔ Real-Time Monitoring
Continuous analog output
Suitable for:
Instant current tracking
✔ Linear Response
Output directly proportional to current
✔ Fast Response Time
Suitable for dynamic load changes
🌡️ Environmental Characteristics
Stable over:
Temperature variations
Suitable for:
Industrial and embedded applications
⚠️ Limitations
Requires calibration for precise measurements
Accuracy depends on:
Shunt resistor tolerance
Analog output:
Susceptible to noise
Limited to:
DC current only
🔌 Typical Pin Configuration
VCC → Power supply
GND → Ground
IN+ / IN− → Across shunt resistor (high-side)
OUT → Analog voltage output
🧩 Functional Role
The module acts as a:
Current measurement sensor
Power monitoring component
Analog sensing interface for embedded systems
🏁 Summary
The 7Semi INA169 5A Breakout is a simple and effective analog current sensing solution that:
Uses shunt resistor + current monitor IC
Measures DC current up to ~5A
Provides linear analog voltage output
Supports high-side current sensing
Is ideal for power monitoring and embedded electronics systems
