ATS660LSB View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'ATS660LSB' PDF : 16 Pages View PDF
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
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 (VCC(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.
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.
1
2
3
4
APPLICATIONS INFORMATION
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.
4
3
2
1
www.allegromicro.com
Dwg. AH-006-1
Dwg. AH-007
9
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