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HAL825UT-K Datasheet(PDF) 9 Page - Micronas |
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HAL825UT-K Datasheet(HTML) 9 Page - Micronas |
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9 / 32 page  DATA SHEET HAL82x Micronas Feb. 3, 2009; DSH000143_003EN 9 Filter The FILTER bit is bit number 4 of the MODE register; it defines the −3 dB frequency of the digital low pass fil- ter. Bit Time The BITTIME bit is bit number 5 of the MODE register; It defines the protocol bit time for the communication between the sensor and the programmer board. Output Format The OUTPUTMODE bits are the bits number 6 to 7 of the MODE register; They define the different output modes. In Analog Output mode, the sensor provides an ratio- metric 12-bit analog output voltage between 0 V and 5V. In Multiplex Analog Output mode, the sensor transmits the LSN and MSN of the output value separately. This enables the sensor to transmit a 14-bit signal. In exter- nal trigger mode the ECU can switch the output of the sensor between LSN and MSN by changing current flow direction through sensor output. In case the out- put is pulled up by a 10 k Ω resistor the sensor sends the MSN. If the output is pulled down the sensor will send the LSN. Maximum refresh rate is about 500 Hz (2 ms). Three pins are sufficient. Note: Please contact Micronas for further information about Multiplex Analog Output Mode. In Burn-In Mode, the signal path of the sensors DSP is stimulated internally without applied magnetic field. In this mode, the sensor provides a “saw tooth” shape output signal. Shape and frequency of the saw tooth signal depends on the programming of the sensor. This mode can be used for Burn-In test in the custom- ers production line. TC Register The temperature dependence of the magnetic sensitiv- ity can be adapted to different magnetic materials in order to compensate for the change of the magnetic strength with temperature. The adaption is done by programming the TC (Temperature Coefficient) and the TCSQ registers (Quadratic Temperature Coeffi- cient). Thereby, the slope and the curvature of the tem- perature dependence of the magnetic sensitivity can be matched to the magnet and the sensor assembly. As a result, the output voltage characteristic can be fixed over the full temperature range. The sensor can compensate for linear temperature coefficients ranging from about −3100 ppm/K up to 1000 ppm/K and qua- dratic coefficients from about −7 ppm/K² to 2 ppm/K². The full TC range is separated in the following four ranges: TC (5 bit) and TCSQ (3 bit) have to be selected individu- ally within each of the four ranges. For example: 0 ppm/k requires TC-Range = 1, TC = 15 and TCSQ = 1. −3 dB Frequency FILTER 500 Hz 0 1kHz 1 Bit Time BITTIME 1:64 (Typ. 1.75 ms) 1 1:128 (Typ. 3.5 ms) 0 Output Format OUTPUTMODE Analog Output (12 bit) 0 Internal Burn-In Mode 2 Multiplex Analog Output (external trigger) − TC-Range [ppm/k] GROUP −3100 to −1800 0 −1750 to −550 2 −500 to +450 (default value) 1 +450 to +1000 3 |
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