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MLX92241LUA-AAA-007 Datasheet(PDF) 8 Page - Melexis Microelectronic Systems |
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MLX92241LUA-AAA-007 Datasheet(HTML) 8 Page - Melexis Microelectronic Systems |
8 / 11 page MLX92241LUA-AAA-007 2-Wire Hall Effect Switch 390109224107 Rev. 1 Page 8 of 11 March/12 8 Application Information 8.1 Typical Automotive Application Circuit C1 10nF VDD GND TEST RSENSE VCC Notes: 1. For proper operation, a 10nF bypass capacitor should be placed as close as possible to the VDD and ground(GND) pin. For complete emissions protection a C1 = 68nF is recommended. 2. The TEST pin is to be left open or connected to GND. MLX92241 ECU VHSENSE 100 8.2 Automotive and Harsh, Noisy Environments Application Circuit 8.3 Strobbing VDD application (used for reduced self-heating) C1 68nF VDD GND TEST RSENSE VCC MLX92241 ECU VHSENSE 100 Notes: 1. Given strobe timing is exemplary only. The output response is for sensor type MLX92221xxx-xLxS. 2. For proper operation, a 10nF to 100nF bypass capacitor should be placed as close as possible to the VDD and ground pin. t t VDD IDD IONtyp I OFFtyp 12V South Pole weak South or B = null ON phase OFF phase (1ms) (1s) Valid IDD state tON tON Valid IDD state C1 68nF VDD GND TEST RSENSE VCC MLX92241 ECU VHSENSE 100 Notes: 1. For proper operation , a 10nF to 100nF bypass capacitor should be placed as close as possible to the VDD and ground pin. 2. The device could tolerate negative voltage down to -24V, so if negative transients over supply line VPEAK< -29V are expected, usage of the diode D1 is recommended. Otherwise only RSENSEis sufficient . When selecting the resistor RSENSE, three points are important: - the resistor has to limit IDD/IDDREV to 50mA maximum - the resistor has to withstand the power dissipated in both over voltage conditions (VRSENSE 2/R SENSE) - the resulting device supply voltage V DD has to be higher than V DDmin (VDD = VCC – RSENSE.IDD) 3. The device could tolerate positive supply voltage up to +27V (until the maximum power dissipation is not exceeded), so if positive transients over supply line with VPEAK> 32V are expected, usage a zener diode DZ 1 is recommended. The RSENSE-DZ1 network should be sized to limit the voltage over the device below the maximum allowed. DZ1 (optional, see Note3) D1 (optional, see Note2) |
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