The AS5600 is a contactless magnetic rotary position sensor manufactured by C. It is designed to provide high-resolution angle measurements by detecting the position of a rotating magnet. This sensor is ideal for applications requiring precise angular position detection without physical contact, ensuring durability and reliability.
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Automotive: Steering angle and throttle position detection
Industrial automation: Rotary encoders and motor control
Consumer electronics: Joysticks and knobs
Medical devices: Position tracking in diagnostic equipment
Technical Specifications
The AS5600 offers a range of features that make it versatile and easy to integrate into various systems. Below are its key technical specifications:
Parameter
Value
Supply Voltage (VDD)
3.0V to 3.6V
Supply Current
6.5 mA (typical)
Output Interfaces
Analog (PWM) and I²C
Resolution
12-bit (4096 positions per revolution)
Operating Temperature Range
-40°C to +125°C
Magnetic Field Strength
20 mT to 80 mT
Maximum Rotational Speed
30,000 RPM
Pin Configuration and Descriptions
The AS5600 is typically available in an 8-pin SOIC package. Below is the pinout and description:
Pin Number
Pin Name
Description
1
VDD
Power supply input (3.0V to 3.6V)
2
OUT
Analog output (PWM signal or voltage proportional to angle)
3
GND
Ground connection
4
SDA
I²C data line
5
SCL
I²C clock line
6
DIR
Direction input (sets clockwise or counterclockwise rotation)
7
MODE
Mode selection (configures output as analog or PWM)
8
NC
Not connected (leave floating or connect to GND for stability)
Usage Instructions
The AS5600 is straightforward to use in a circuit, whether for analog or digital applications. Below are the steps and considerations for integrating the sensor:
Connecting the AS5600
Power Supply: Connect the VDD pin to a 3.3V power source and the GND pin to ground.
Output Mode: Use the MODE pin to select the desired output:
Connect MODE to GND for analog output.
Connect MODE to VDD for PWM output.
Direction Control: Use the DIR pin to set the rotation direction:
Connect DIR to GND for clockwise rotation.
Connect DIR to VDD for counterclockwise rotation.
I²C Communication: If using I²C, connect the SDA and SCL pins to the corresponding lines on your microcontroller. Pull-up resistors (typically 4.7kΩ) are required on both lines.
Example: Using AS5600 with Arduino UNO
The AS5600 can be easily interfaced with an Arduino UNO via I²C. Below is an example code snippet to read the angle:
#include <Wire.h>
// AS5600 I2C address
#define AS5600_ADDR 0x36
// Register addresses for angle data
#define AS5600_RAW_ANGLE_HIGH 0x0C
#define AS5600_RAW_ANGLE_LOW 0x0D
void setup() {
Wire.begin(); // Initialize I2C communication
Serial.begin(9600); // Start serial communication for debugging
}
void loop() {
uint16_t rawAngle = readRawAngle(); // Read the raw angle value
float angle = (rawAngle * 360.0) / 4096.0; // Convert to degrees (12-bit resolution)
Serial.print("Angle: ");
Serial.print(angle);
Serial.println(" degrees");
delay(500); // Wait for 500ms before the next reading
}
// Function to read the raw angle from AS5600
uint16_t readRawAngle() {
Wire.beginTransmission(AS5600_ADDR); // Start communication with AS5600
Wire.write(AS5600_RAW_ANGLE_HIGH); // Request high byte of raw angle
Wire.endTransmission(false); // Send repeated start condition
Wire.requestFrom(AS5600_ADDR, 2); // Request 2 bytes (high and low)
uint8_t highByte = Wire.read(); // Read high byte
uint8_t lowByte = Wire.read(); // Read low byte
return (highByte << 8) | lowByte; // Combine high and low bytes
}
Important Considerations
Magnet Selection: Use a diametrically magnetized magnet with a field strength between 20 mT and 80 mT for optimal performance.
Placement: Ensure the magnet is centered and positioned 0.5mm to 3mm above the sensor for accurate readings.
Noise Filtering: Use decoupling capacitors (e.g., 100nF) near the VDD pin to reduce noise.
I²C Pull-Up Resistors: Ensure proper pull-up resistors are used on the SDA and SCL lines for reliable communication.
Troubleshooting and FAQs
Common Issues and Solutions
No Output Signal
Cause: Incorrect power supply or loose connections.
Solution: Verify that VDD is connected to a 3.3V source and all connections are secure.
Inaccurate Angle Measurements
Cause: Magnet misalignment or incorrect placement.
Solution: Ensure the magnet is centered and within the recommended distance from the sensor.
I²C Communication Failure
Cause: Missing pull-up resistors or incorrect I²C address.
Solution: Add 4.7kΩ pull-up resistors to SDA and SCL lines and confirm the AS5600 address (default: 0x36).
Output Signal is Noisy
Cause: Power supply noise or insufficient decoupling.
Solution: Add a 100nF capacitor near the VDD pin to filter noise.
FAQs
Q: Can the AS5600 measure angles beyond 360°?
A: No, the AS5600 measures angles within a single 360° rotation. For multiple rotations, additional logic is required to track revolutions.
Q: What happens if the magnetic field strength is too low or too high?
A: The AS5600 may produce inaccurate readings or fail to detect the magnet. Ensure the field strength is within the 20 mT to 80 mT range.
Q: Can I use the AS5600 with a 5V microcontroller?
A: Yes, but you must use a level shifter for the I²C lines or ensure the microcontroller's I²C pins are 3.3V tolerant.
Q: Is the AS5600 suitable for high-speed applications?
A: Yes, the AS5600 supports rotational speeds up to 30,000 RPM, making it suitable for high-speed applications.
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