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MLX90365EDC-ABB Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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MLX90365EDC-ABB Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 35 page MLX90365 Triaxis® Position Sensor IC MLX90365 Page 6 of 35 Datasheet Rev. 5.7 Jan. 22, 16 5. Absolute Maximum Ratings Parameter Value Supply Voltage, VDD (overvoltage) + 24 V Reverse Voltage Protection − 12 V (breakdown at -14 V) Positive Output Voltage + 18 V (breakdown at 24 V) Output Current (IOUT) + 30 mA (in breakdown) Reverse Output Voltage − 0.3 V Reverse Output Current − 50 mA (in breakdown) Operating Ambient Temperature Range, TA − 40°C … + 150°C Storage Temperature Range, TS − 40°C … + 150°C Magnetic Flux Density ± 1 T Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. 6. Description As described on the block diagram the three vector components of the magnetic flux density (BX, BY and BZ) applied to the IC are sensed through the sensor front-end. The respective Hall signals (VX, VY and VZ) are generated at the Hall plates and amplified. The analog signal processing is based on a fully differential analog chain featuring the classic offset cancellation technique (Hall plate 2-Phases spinning and chopper-stabilized amplifier). The conditioned analog signals are converted through an ADC (15 bits) and provided to a DSP block for further processing. The DSP stage is based on a 16 bit RISC micro-controller whose primary function is the extraction of the position from two (out of three) raw signals (after so-called front-end compensation steps) through the following function: ( ) 2 1 , V k V ⋅ ∠ = α where alpha is the magnetic angle ∠(B1, B2), V1 = VX or VY or VZ , V2 = VX or VY or VZ and k is a programmable factor to match the amplitude of V1 and k V2. The DSP functionality is governed by the micro-code (firmware − F/W) of the micro-controller which is stored into the ROM (mask programmable). In addition to the magnetic angle extraction, the F/W controls the whole analog chain, the output transfer characteristic, the output protocol, the programming/calibration and also the self-diagnostic modes. The magnetic angular information is intrinsically self-compensated vs. flux density variations. This feature allows therefore an improved thermal accuracy vs position sensor based on conventional linear Hall sensors. In addition to the improved thermal accuracy, the realized position sensor features excellent linearity performances taking into account typical manufacturing tolerances (e.g. relative placement between the Hall IC and the magnet). |
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