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AS5245HQFT Datasheet(PDF) 11 Page - ams AG |
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AS5245HQFT Datasheet(HTML) 11 Page - ams AG |
11 / 32 page www.austriamicrosystems.com/AS5245 Revision 1.5 10 - 31 AS5245 Data Sheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS5245 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 around the center of the device and deliver a voltage representation of the magnetic field at the surface of the IC. Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5245 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 to provide digital information at the outputs MagINCn and MagDECn that indicate movements of the used magnet towards or away from the device’s surface. A small low cost diametrically magnetized (two-pole) standard magnet provides the angular position information (see Figure 16). The AS5245 senses the orientation of the magnetic field and calculates a 12-bit binary code. This code can be accessed via. a Synchronous Serial Interface (SSI). In addition, an absolute angular representation is given by a Pulse Width Modulated signal at pin 12 (PWM). This PWM signal output also allows the generation of a direct proportional analog voltage, by using an external Low-Pass-Filter. The AS5245 is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique and Hall sensor conditioning circuitry. Figure 4. Typical Arrangement of AS5245 and Magnet 8.1 Mode_Index Pin The Mode_Index pin activates or deactivates an internal filter that is used to reduce the analog output noise. Activating the filter (Mode pin = LOW or open) provides a reduced output noise of 0.03º rms. At the same time, the output delay is increased to 384µs. This mode is recommended for high precision, low speed applications. Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96µs and provides an output noise of 0.06º rms. This mode is recommended for higher speed applications. Setting up the Mode pin affects the following parameters: Note: A change of the Mode during operation is not allowed. The setup must be constant during power up and during operation. Table 6. Slow and Fast Mode Parameters Parameter Slow Mode (mode=low or open) Fast Mode (mode=high, VDD=5V) Sampling rate 2.61 kHz (384 µs) 10.42 kHz (96µs) Transition noise (1 sigma) ≤ 0.03º rms ≤ 0.06º rms Output delay 384µs 96µs Maximum speed @ 4096 samples/rev 38 rpm 153 rpm Maximum speed @ 1024 samples/rev 153 rpm 610 rpm Maximum speed @ 256 samples/rev 610 rpm 2441 rpm Maximum speed @ 64 samples/rev 2441 rpm 9766 rpm |
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