1. Overview

The AS5047P is a magnetic encoder designed for applications requiring precise angular position measurement. It combines a high-resolution magnetic sensor with a CORDIC processor and features a programmable interface. It's designed to be robust, potentially suitable for demanding environments. It has both volatile (RAM) and non-volatile (OTP - One-Time Programmable) registers for configuration and data storage.

2. Key Features

️· High Resolution: Provides precise angular position information.
️· Magnetic Sensing: Uses a magnetic sensor, potentially offering robustness against environmental factors (dust, dirt, etc.) compared to optical encoders.
️· CORDIC Processor: Enables efficient computation of trigonometric functions (needed for angular calculations).
️· Dynamic Angle Error Compensation (DAEC): Minimizes errors caused by magnetic offset and other factors. Can be disabled via a register.
️· Programmable Interface: Offers flexibility in configuration and adaptation to different applications.
️· PWM Output: Supports PWM output for easy integration with motor control systems.
️· Non-Volatile Memory (OTP): Allows for storing zero position (initial angle) and custom settings, preserving these even after power loss.
️· Error Detection & Reporting: Provides registers for error status reporting (parity errors, framing errors, invalid commands).
️· Diagnostic Features: Includes diagnostics for magnetic field strength, CORDIC overflow, and offset compensation status.

3. Registers (Summary)


A. Volatile Registers (RAM - Lost on Power Loss)

️· NOP (0x0000): No Operation.
️· ERRFL (0x0001): Error Flag Register. Cleared by reading. Reports parity errors, invalid command errors, and framing errors.
️· PROG (0x0003): Programming Register. Used for OTP programming cycles, verification, and refreshing.
️· DIAAGC (0x3FFC): Diagnostic and Automatic Gain Control Register. Reports magnetic field strength, CORDIC overflow, offset compensation status, and AGC values.
️· MAG (0x3FFD): CORDIC Magnitude Register. Provides CORDIC magnitude information.
️· ANGLEUNC (0x3FFE): Measured Angle Without DAEC.
️· ANGLECOM (0x3FFF): Measured Angle With DAEC.

B. Non-Volatile Registers (OTP - One-Time Programmable)

️· ZPOSM (0x0016): Zero Position MSB.
️· ZPOSL (0x0017): Zero Position LSB. Contains bits for error enabling.
️· SETTINGS1 (0x0018): Custom Setting Register 1. Controls DAEC enable/disable, rotation direction, PWM output selection, resolution selection.
️· SETTINGS2 (0x0019): Custom Setting Register 2. Controls number of pole pairs, hysteresis, and resolution of ABI.
️· RED (0x001A): Redundancy Register. Used for recovery after failed OTP programming.

4. Key Considerations & Important Settings

️· OTP Programming: The OTP memory can only be programmed *once*. Careful planning and testing are required before programming.
️· DAEC (Dynamic Angle Error Compensation): Decide whether to enable or disable DAEC based on the application's needs. Disabling it can be beneficial in some situations but may increase error.
️· PWM Output: Configure the PWM output based on the application's motor control requirements.
️· Rotation Direction: Setting correct rotation direction for correct data.
️· Error Handling: Implement appropriate error handling routines based on the error flags reported in the ERRFL register.
️· ABI Resolution: Set desired resolution based on needed accuracy.