Original WCS2702 Hall Effect based Linear Current Sensor (0-2.0A)

🔹 Original WCS2702 Hall Effect Linear Current Sensor (0–2A) – Technical Information
 
🔹 Overview
The WCS2702 is a Hall-effect based linear current sensor designed for precise AC and DC current measurement up to ±2A.
Provides analog voltage output proportional to current
Offers electrical isolation between input current path and output signal
Suitable for low-current, high-precision applications
👉 It belongs to the Winson WCS series of current sensors
🔹 Working Principle
Current flows through an internal conductor (low resistance path)
Generates a magnetic field
Integrated Hall sensor detects magnetic field
Internal circuitry converts it into proportional analog voltage
👉 Output voltage ∝ input current
🔹 Measurement Characteristics
Current Range:
DC: ±0 to 2A
AC: up to ~1.4A RMS
Sensitivity:
1 mV per mA (or 1 V per 1A)
Zero Current Output:
~Vcc / 2 (≈2.5V at 5V supply)
👉 Allows bidirectional current measurement
🔹 Electrical Characteristics
Supply Voltage: 3.0V – 12V
Operating Current: ~3–6 mA
Internal Conductor Resistance: ~98 mΩ
👉 Low resistance → reduced power loss
🔹 Output Characteristics
Type: Analog voltage output
Ratiometric Output: Scales with supply voltage
Bandwidth: ~10 kHz
👉 Suitable for dynamic current measurements
🔹 Isolation & Safety
Provides galvanic isolation (~1000V) between:
Current path
Signal output
👉 Eliminates need for opto-isolators
🔹 Performance Characteristics
Low noise analog signal path
Low temperature drift
Nearly zero magnetic hysteresis
👉 Ensures stable and repeatable measurements
🔹 Internal Structure
Linear Hall-effect sensor IC
Temperature compensation circuit
Low-resistance current conductor
Signal conditioning and amplification stage
🔹 Functional Behavior
Measures both AC and DC current
Outputs linear analog voltage
Output increases/decreases based on:
Current magnitude
Current direction
🔹 Key Technical Features
±2A current measurement range
High sensitivity (1 mV/mA)
Electrical isolation (1000V)
Low conductor resistance (98 mΩ)
Wide supply voltage range
Analog linear output
Low power consumption
10 kHz bandwidth
🔹 Advantages
High accuracy for low-current sensing
No shunt resistor → no insertion loss issues
Electrically isolated measurement
Simple analog interface
🔹 Limitations
Limited to low current (2A max)
Analog output requires:
ADC for microcontroller use
Sensitive to external magnetic interference
Needs proper filtering for noise-sensitive applications
🔹 Applications
Battery monitoring systems
Low-current load measurement
Power management systems
Motor control (small motors)
Overcurrent detection circuits
Embedded electronics systems
🔹 Technical Summary
The WCS2702 is a precision low-current Hall-effect sensor that:
Provides isolated, linear analog current measurement
Works with both AC and DC signals
Is optimized for low-current, high-accuracy applications
👉 Best suited when you need:
Electrical isolation + analog simplicity
Accurate measurement below 2A range