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MLX90277EGOSR1-2 Datasheet(PDF) 9 Page - Melexis Microelectronic Systems |
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MLX90277EGOSR1-2 Datasheet(HTML) 9 Page - Melexis Microelectronic Systems |
9 / 21 page MLX90277 Dual Programmable Linear Hall Effect Sensor 3901090277 Page 9 of 21 Data Sheet Rev 004 Nov/06 The MLX90277 sensors also have an additional stage, Fine Gain, for fine tuning the Sensitivity. The stage (parameter FG) follows the RG and provides a 10 bit adjustment. The small signal gain of the FG is within 1.0 and 2.5. The RG and FG parameters are adjusted in the application to calibrate the sensitivity (gain) and output slope transfer characteristic of the device. The function for the fine gain is given in the following equation: 1023 * 6 . 0 1 1 FG Gain Fine − = Note. The one bit parameter INVERT is used to fix the “sign” of the sensitivity. A value of 0 makes the gain positive and the output voltage increases in response to a South magnetic field. A value of 1 makes the gain negative and the output voltage decrease in response to a South magnetic field. Refer to section 10.5, Sensitivity Polarity for more information on INVERT. 10.4 Sensitivity Range Selection Each unit is characterized over temperature during final test to optimize its performance and accuracy. To achieve the best possible Sensitivity Temperature Compensation, TempCo., each unit is optimized for use within a specific Sensitivity range. This is represented in the ordering information by the option code. There are four available ranges, option codes 0, 1, 2 and 3. The option code corresponds with the two MSB of the RG parameter. Each device is tested to meet the TempCo specification in the Sensitivity range determined by the RG parameter (RG = 0…3, RG = 4…7, RG = 8...11 or RG = 12…15), regardless of the FG parameter. The Sensitivity range is selected independently for Sensor A and Sensor B. Melexis may limit the available combinations. Option Code Rough Gain Sensitivity Range (mV/mT) Typical Magnetic Field Range (mT, BMAX - BMIN) 0 0-3 (00 xx) 2.6 < S < 15 333 < B < 800 1 4-7 (01 xx) 10 < S < 35 156 < B < 333 2 8-11 (10 xx) 18 < S < 90 62 < B < 156 3 12-15 (11 xx) 50 < S < 210 6 < B < 62 Table 9: Optimized Sensitivity Range The next figures show the typical Sensitivity versus the FG and RG parameters. The gray areas are representative of the chip to chip dispersion (i.e.: for the same RG and FG parameters, the Sensitivity can vary from chip to chip). There is large overlap between the different ranges for use of one range for applications with large magnetic and/or mechanical dispersions. The Sensitivity graphs and tables can be used to select the right device type for the application. If one is unsure of the application’s magnetic design and the desired Sensitivity range Melexis recommends option code 2. |
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