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AS5043TR Datasheet(PDF) 3 Page - ams AG |
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AS5043TR Datasheet(HTML) 3 Page - ams AG |
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3 / 26 page  AS5043 Programmable 360° Magnetic Angle Encoder Revision 1.4, 04-Apr-06 www.austriamicrosystems.com Page 3 of 26 Access to this pin allows various OPAMP configurations. Pin 12 Vout is the analog output pin. The analog output is a DC voltage, ratiometric to VDD5V (3.0 – 5.5V) or an external voltage source and proportional to the angle. 6 Functional Description The AS5043 is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing the magnetic field distribution across the surface of the chip. The integrated Hall elements are placed in a circle around the center of the device and deliver a voltage representation of the magnetic field perpendicular to the surface of the IC. Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5043 provides accurate high-resolution absolute angular position information. For this purpose a Coordinate Rotation Digital Computer (CORDIC) calculates the angle and the magnitude of the Hall array signals. The DSP is also used indicate movements of the magnet towards or away from the chip and to indicate, when the magnetic field is outside of the recommended range (status bits = MagInc, MagDec; hardware pin = MagRngn). A small low cost diametrically magnetized (two-pole) standard magnet, centered over the chip, is used as the input device. The AS5043 senses the orientation of the magnetic field and calculates a 10-bit binary code. This code can be accessed via a Synchronous Serial Interface (SSI). In addition, the absolute angular representation is converted to an analog signal, ratiometric to the supply voltage. The analog output can be configured in many ways, such as 360°/180°/90° or 45° angular range, external or internal DAC reference voltage, 0-100%*VDD or 10- 90% *VDD analog output range, external or internal amplifier gain setting. The various output modes as well as a user programmable zero position can be programmed in an OTP register. As long as no programming voltage is applied to pin PROG, the new setting may be overwritten at any time and will be reset to default when power is cycled. To make the setting permanent, the OTP register must be programmed by applying a programming voltage. The AS5043 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential measurement technique and Hall sensor conditioning circuitry. It is also tolerant to airgap and temperature variations due to Sin-/Cos- signal evaluation. Sin Cos Ang Mag MagRNGn Mode DO CLK FB Vout Prog_DI CSn + - 10 DACout DACref Figure 3: AS5043 block diagram |
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