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AS5035TR Datasheet(PDF) 10 Page - ams AG |
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AS5035TR Datasheet(HTML) 10 Page - ams AG |
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10 / 17 page  AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER Revision 1.5 www.austriamicrosystems.com Page 10 of 17 10.4 Output Delays Due to the sampling rate of 10kHz, there will be a delay of up to 100µs between the time that the sample is taken until it is converted and available as angular data. A rotating magnet will therefore cause an angular error caused by the output delay. This error increases linearly with speed: 4 6 − ∗ = E rpm e sampling At low speeds this error is small (e.g. <= 0.06° at 100 rpm). At speeds over 586 rpm, the error approaches 1LSB (0.35°). The maximum error caused by the sampling rate of the ADCs is 0/+100µs. It has a peak of 1LSB = 0.35° at 586 rpm. At higher speeds this error is reduced again due to interpolation and the output delay remains at 200µs as the DSP requires two sampling periods (2x100µs) to synthesize and redistribute any missing pulses. 10.5 Temperature 10.5.1 Magnetic Temperature Coefficient One of the major benefits of the AS5035 compared to linear Hall sensors is that it is much less sensitive to temperature. While linear Hall sensors require a compensation of the magnet’s temperature coefficients, the AS5035 automatically compensates for the varying magnetic field strength over temperature. The magnet’s temperature drift does not need to be considered, as the AS5035 operates with magnetic field strengths from ±45…±75mT. Example: A NdFeB magnet has a field strength of 75mT @ –40°C and a temperature coefficient of -0.12% per Kelvin. The temperature change is from –40° to +125° = 165K. The magnetic field change is: 165 x -0.12% = -19.8%, which corresponds to 75mT at –40°C and 60mT at 125°C . The AS5035 can compensate for this temperature related field strength change automatically, no user adjustment is required. 10.5.2 Accuracy over Temperature The influence of temperature in the absolute accuracy is very low. While the accuracy is ≤ ±0.5° at room temperature, it may increase to ≤±0.9° due to increasing noise at high temperatures. 10.5.3 Timing Tolerance over Temperature The internal RC oscillator is factory trimmed to ±5%. Over temperature, this tolerance may increase to ±10%. Generally, the timing tolerance has no influence in the accuracy or resolution of the system, as it is used mainly for internal clock generation. 11 Failure Diagnostics The AS5035 also offers several diagnostic and failure detection features: 11.1 Magnetic Field Strength Diagnosis Pins #1 (MagINCn) and #2 (MagDECn) are open-drain outputs and will both be turned on (= low with external pull-up resistor) when the magnetic field is out of range. If only one of the outputs is low, the magnet is either moving towards the chip (MagINCn) or away from the chip (MagDECn). 11.2 Power Supply Failure Detection 11.2.1 MagINCn and MagDECn Pins: These are open drain outputs and require external pull- up resistors. In normal operation, these pins are high ohmic and the outputs are high (see Table 2). In a failure case, either when the magnetic field is out of range or the power supply is missing, these outputs will become low. To ensure adequate low levels in case of a broken power supply to the AS5035, the pull-up resistors (>10k Ω) must be connected to the positive supply at pin 16 (VDD5V). 11.2.2 Incremental Outputs: In normal operation, pins A(#3), B(#4) and Index (#6) will never be high at the same time, as Index is only high when A=B=low. However, after a power-on-reset, if VDD is powered up or restarts after a power supply interruption, all three outputs will remain in high state until pin CSn is pulled low (see 5.4.2 ). If CSn is already tied to VSS during power-up, the incremental outputs will all be high until the internal offset compensation is finished (within tPwrUp). Another way to detect a power supply loss is by connecting pull-up resistors to the A,B and Index pins at the receiving side (µC, control unit, etc..). If the negative power line to the sensor is interrupted, all three outputs will be pulled high by the external pull-up resistors. This unique state again indicates a failure as it does not occur in normal operation. |
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