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ATS640JSB Datasheet(PDF) 9 Page - Allegro MicroSystems |
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ATS640JSB Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 16 page ATS660LSB TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR www.allegromicro.com 9 DEVICE DESCRIPTION — Continued Power-on state operation. The device is guaranteed to power on (power up) in the off state (high output voltage) regardless of the presence or absence of a gear tooth. Under-voltage lockout. If the supply voltage falls below the minimum operating voltage (V CC(UV)), the device output will turn off (high output voltage) and stay off irrespective of the state of the magnetic field. This prevents false signals caused by under-voltage conditions from propagating through to the output of the sensor. Output. The output of the subassembly is a short-circuit- protected open-collector stage capable of sinking 20 mA. An external pull-up (resistor) to a supply voltage of not more than 26.5 V must be supplied. Dwg. AH-006-1 1 2 3 4 APPLICATIONS INFORMATION Dwg. AH-007 1 2 3 4 Output polarity. The output of the device will switch from off to on as the leading edge of the target passes the subassembly in the direction indicated (pin 4 to pin 1), which means that the output voltage will be low when the unit is facing a tooth. If rotation is in the opposite direc- tion (pin 1 to pin 4), the output of the device will switch from on to off as the leading edge of the target passes the subassembly, which means that the output voltage will be high when the unit is facing a tooth. Power supply protection. The device contains an on- chip regulator and can operate over a wide supply voltage range. For devices that need to operate from an unregu- lated power supply, transient protection should be added externally. For applications using a regulated line, EMI/ RFI protection is still required. Incorrect protection can result in unexplained pulses on the output line, providing inaccurate sensing information to the user. EMI protection circuitry can easily be added to a PC board for use with this device. Provisions have been made for easy mounting of this board on the back of the unit. PC board installation parallel to the device axis is also pos- sible. |
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