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MLX90215EVA Datasheet(PDF) 4 Page - Melexis Microelectronic Systems |
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MLX90215EVA Datasheet(HTML) 4 Page - Melexis Microelectronic Systems |
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4 / 10 page  3901090215 Page 4 9/09/03 Rev 007 MLX90215 Precision Programmable Linear Hall Effect Sensor Programming the Temperature Compensation The MLX90215 has a 5-bit (32 step) programmable adjustment that changes it’s sensitivity drift over a given temperature range. By adjusting the TC code the sensitivity can be programmed to increase as temperature increases to counteract the decrease in magnetic flux most magnets display over temperature. For example a SmCo (Samarium Cobalt) magnet has a temperature coefficient of approximately -300 ppm/ oC. The MLX90215 can be programmed with a TC of 300 ppm/ oC to counteract the TC of the magnet and greatly improve linearity in the application over temperature. Table 3 (left) illustrates the way the TC code affects the sensitivity temperature drift. Also note in Table 3, the overlap in TC codes. The numbers in the table represent typical results and are for reference only. For accurate results the TC code must be determined experimentally. This TC code map applies to MLX90215’s with a first line brand showing “215DB” Special Note The MLX90215 programmed with a zero TC code (default) has a typical TC value between the range of – 300 to –600 ppm/ oC. This means sensitivity will decrease slightly as temperature increases. The slightly negative initial TC value allows the MLX90215 to be accurately programmed up to 0 TC. Almost all magnets have a naturally negative TC code. The natural TC of a magnet added with the initial negative TC value of the MLX90215 could degrade linearity over a large temperature span. Using a TC code of 6, 7, or 8 will give the MLX90215 a slightly positive TC code. Previous revisions of the MLX90215 with second line brand of “15AXX” or “15DXX” should refer to factory for TC code maps. Diagnostic Characteristics TC Code Min Typical Max Units 0 -700 -550 -350 ppm/oC 1 -625 -450 -275 ppm/oC 2 -525 -375 -175 ppm/oC 3 -450 -300 -100 ppm/oC 4 -350 -200 -25 ppm/oC 5 -275 -125 50 ppm/oC 6 -200 -50 125 ppm/oC 7 -100 25 225 ppm/oC 8 125 275 425 ppm/oC 9 225 350 525 ppm/oC 10 300 425 600 ppm/oC 11 375 525 700 ppm/oC 12 450 600 775 ppm/oC 13 525 675 850 ppm/oC 14 600 775 950 ppm/oC 15 675 850 1025 ppm/oC 16 975 1300 1550 ppm/oC 17 1025 1375 1650 ppm/oC 18 1125 1470 1750 ppm/oC 19 1200 1550 1825 ppm/oC 20 1275 1650 1950 ppm/oC 21 1325 1725 2025 ppm/oC 22 1425 1800 2125 ppm/oC 23 1475 1900 2200 ppm/oC 24 1500 2000 2425 ppm/oC 25 1550 2100 2525 ppm/oC 26 1600 2200 2625 ppm/oC 27 1675 2275 2700 ppm/oC 28 1750 2375 2825 ppm/oC 29 1825 2450 2925 ppm/oC 30 1900 2550 3025 ppm/oC 31 1950 2650 3125 ppm/oC Table 3 - Temperature Compensation Condition Output Level VOUT Shorted to VDD VOUT = VDD VOUT Shorted to VSS VOUT = VSS VOUT open with pull up load VOUT = VDD VOUT open with pull down load VOUT = VSS VSS open with pull up load VOUT = VDD VSS open with pull down load > 10 K Ohms VOUT = VDD or 94% VDD VDD open with pull up load > 4.7 K Ohms VOUT = VSS or 3% VDD VDD open with pull down load VOUT = VSS Temperature Compensation Temperature compensation (TC) is defined as the change in sensitivity over temperature. Expressed in (Parts Per Million per Degree Celcius) ppm/ oC. SensT1 = Sensitivity measured at Temperature 1 (T1) SensT2 = Sensitivity measured at Temperature 2 (T2) Sens25 = Initial Sensitivity measured at 25 oC C ppm T T Sens Sens Sens TC o T T 6 25 2 1 10 2 1 1 ∗ − ∗ − = |
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