BinKey

A1301/A1302 Hall Effect Sensors

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Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

A1301/A1302 Hall Effect Sensors

Continuous-time ratiometric linear Hall-effect sensor ICs optimized to accurately provide a voltage output that is proportional to an applied magnetic field.

Overview

The A1301 and A1302 are precision Hall-effect sensors designed for applications requiring accurate magnetic field measurement. These sensors provide a linear analog output voltage that is directly proportional to the strength of the applied magnetic field, making them ideal for position sensing, current sensing, and proximity detection applications.

Key Features

Linear Hall-Effect Technology

  • Continuous-time operation for real-time magnetic field monitoring
  • Ratiometric output proportional to supply voltage
  • Linear response to magnetic field strength
  • High sensitivity for detecting small magnetic field changes
  • Temperature stable operation across wide temperature range

Precision Performance

  • Low offset voltage for accurate zero-field detection
  • Low noise for stable measurements
  • High resolution magnetic field detection
  • Excellent linearity over operating range
  • Minimal temperature drift

Technical Specifications

Electrical Characteristics

  • Supply Voltage (VCC): 4.5V to 6.0V
  • Supply Current: 10mA typical
  • Output Voltage Range: 10% to 90% of VCC
  • Sensitivity: 2.5mV/G typical (A1301), 1.3mV/G typical (A1302)
  • Operating Temperature: -40°C to +85°C
  • Storage Temperature: -65°C to +150°C

Magnetic Specifications

  • Magnetic Range: ±1000 Gauss (A1301), ±2000 Gauss (A1302)
  • Linearity: ±1.5% of full scale
  • Hysteresis: ±5 Gauss maximum
  • Response Time: 3μs typical
  • Bandwidth: 22kHz typical

Package Information

  • Package Type: 3-pin SIP (Single In-line Package)
  • Pin Spacing: 0.1” (2.54mm)
  • Package Dimensions: 4.06mm × 3.05mm × 1.59mm
  • Lead Material: Tin-plated copper alloy
  • Body Material: Thermoplastic

Pinout Diagram

3-Pin SIP Package:

    ┌─────┐
VCC │  1  │
    │     │
OUT │  2  │
    │     │
GND │  3  │
    └─────┘

Pin Descriptions

PinSymbolDescription
1VCCPower supply input (4.5V to 6.0V)
2VOUTAnalog voltage output
3GNDGround connection

Connection Notes:

  • VCC: Connect to regulated 5V power supply
  • VOUT: Analog output voltage proportional to magnetic field
  • GND: Connect to system ground
  • Decoupling: Use 0.1μF ceramic capacitor between VCC and GND

Differences Between A1301 and A1302

A1301 Specifications

  • Sensitivity: 2.5mV/G typical
  • Magnetic Range: ±1000 Gauss
  • Applications: High-sensitivity applications, weak magnetic fields
  • Resolution: Higher resolution for small field changes

A1302 Specifications

  • Sensitivity: 1.3mV/G typical
  • Magnetic Range: ±2000 Gauss
  • Applications: Wider range applications, stronger magnetic fields
  • Dynamic Range: Larger magnetic field measurement range

Applications

Position Sensing

  • Linear Position Detection: Measure position of magnetic targets
  • Rotary Position Sensing: Detect angular position with rotating magnets
  • Proximity Detection: Non-contact distance measurement
  • Valve Position Monitoring: Hydraulic and pneumatic valve feedback

Current Sensing

  • DC Current Measurement: Using current-carrying conductors
  • AC Current Monitoring: With appropriate signal conditioning
  • Power Monitoring: Current feedback in power supplies
  • Motor Control: Current sensing for motor drive circuits

Automotive Applications

  • Throttle Position Sensing: Engine management systems
  • Gear Position Detection: Transmission control
  • Suspension Position: Active suspension systems
  • Steering Angle Sensing: Electronic stability control

Industrial Applications

  • Machine Position Feedback: CNC machines and robotics
  • Conveyor Speed Sensing: Material handling systems
  • Fluid Level Detection: With magnetic float systems
  • Safety Interlocks: Magnetic door and guard sensing

Circuit Design Considerations

Power Supply Design

  • Regulated Supply: Use stable 5V regulated power supply
  • Decoupling: Place 0.1μF ceramic capacitor close to sensor
  • Supply Filtering: Additional filtering may be needed in noisy environments
  • Ground Plane: Use solid ground plane for best performance

Output Signal Conditioning

  • ADC Interface: Connect output directly to microcontroller ADC
  • Signal Filtering: Low-pass filter for noise reduction if needed
  • Amplification: Op-amp amplifier for increased sensitivity
  • Offset Adjustment: Trim circuit for zero-field calibration

Magnetic Circuit Design

  • Magnet Selection: Choose appropriate magnet strength and type
  • Air Gap: Optimize distance between magnet and sensor
  • Magnetic Shielding: Shield from external magnetic fields
  • Temperature Effects: Consider magnet temperature coefficient

Programming Examples

Arduino Integration

// A1301/A1302 Hall Effect Sensor Reading
const int hallPin = A0;  // Analog input pin
const float vcc = 5.0;   // Supply voltage
const float sensitivity = 2.5; // mV/G for A1301 (use 1.3 for A1302)
 
void setup() {
  Serial.begin(9600);
}
 
void loop() {
  int rawValue = analogRead(hallPin);
  float voltage = (rawValue / 1023.0) * vcc;
  
  // Calculate magnetic field (assuming 2.5V = 0 Gauss)
  float magneticField = (voltage - 2.5) / (sensitivity / 1000.0);
  
  Serial.print("Voltage: ");
  Serial.print(voltage, 3);
  Serial.print("V, Magnetic Field: ");
  Serial.print(magneticField, 1);
  Serial.println(" Gauss");
  
  delay(100);
}

Calibration Procedure

  1. Zero Field Calibration: Measure output with no magnetic field present
  2. Known Field Calibration: Apply known magnetic field and measure output
  3. Calculate Sensitivity: Determine actual sensitivity from measurements
  4. Temperature Compensation: Account for temperature effects if needed

Installation and Mounting

Physical Mounting

  • PCB Mounting: Through-hole mounting on PCB
  • Mechanical Mounting: Secure mounting to prevent vibration
  • Orientation: Align sensitive axis with magnetic field direction
  • Protection: Protect from mechanical damage and contamination

Environmental Considerations

  • Temperature Range: Ensure operation within specified temperature range
  • Humidity: Protect from moisture and condensation
  • Vibration: Secure mounting to prevent mechanical stress
  • EMI: Shield from electromagnetic interference if necessary

Troubleshooting

Common Issues

  • No Output: Check power supply and connections
  • Incorrect Reading: Verify magnetic field orientation and strength
  • Noisy Output: Add filtering and check grounding
  • Temperature Drift: Implement temperature compensation

Performance Optimization

  • Calibration: Regular calibration for best accuracy
  • Filtering: Appropriate signal filtering for application
  • Shielding: Magnetic shielding from external fields
  • Layout: Proper PCB layout for minimal noise

Storage Information

  • Location: Cabinet 3, Bin 26
  • Quantity: 10 sensors (mix of A1301 and A1302)
  • Condition: New, unused components
  • Packaging: Anti-static packaging
  • Documentation: Datasheet and application notes available

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