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AS5043ASST Datasheet(PDF) 27 Page - ams AG

Part # AS5043ASST
Description  Programmable 360 Magnetic Angle Encoder with Absolute SSI and Analog Outputs
Download  36 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5043ASST Datasheet(HTML) 27 Page - ams AG

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AS5043
Data Sheet – Angular Output Tolerances
www.austriamicrosystems.com
Revision 1.80
27 – 36
18.7 Temperature
18.7.1 Magnetic Temperature Coefficient
One of the major benefits of the AS5043 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 AS5043 automatically
compensates for the varying magnetic field strength over temperature. The magnet’s temperature drift does not need to
be considered, as the AS5043 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 AS5043 can compensate for this temperature related field strength change automatically, no user adjustment is
required.
18.7.2 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.
18.7.3 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.


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