ATS611 View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'ATS611' PDF : 16 Pages View PDF
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSORS
APPLICATIONS INFORMATION — Continued
Signal Duty Cycle. For repetitive target structures,
precise duty cycle is maintained over the operating air gap
and temperature range due to an extremely good symme-
try in the magnetic switch points of the device. For
nonrepetitive target structures, there will be a small but
measureable change in pulse width versus air gap.
Output Polarity. The output of the device will switch from
HIGH to LOW as the leading edge of the target passes
the module in the direction indicated below (pin 4 to pin
1), which means that the output will be LOW when the unit
is facing a tooth. If rotation is in the opposite direction
(pin 1 to pin 4), the output of the device will switch from
LOW to HIGH as the leading edge of the target passes
the module, which means that the output will be HIGH
when the unit is facing a tooth.
1
2
3
4
Dwg. AH-006-1
4
3
2
1
Dwg. AH-007
Operation From a Regulated Power Supply. These
devices require minimal protection circuitry during opera-
tion from a low-voltage regulated line. The on-chip
voltage regulator provides immunity to power supply
variations between 3.5 V and 16 V. However, even while
operating from a regulated line, some supply and output
filtering is required to provide immunity to coupled and
injected noise on the supply line. A basic RC low-pass
circuit (R1C1) on the supply line and an optional output
capacitor (C2) is recommended for operation in noisy
environments. Because the device has an open-collector
output, an output pull-up resistor (RL) must be included
either at the sensor output (pin 2) or by the signal proces-
sor input.
SUPPLY
RL
OUTPUT
C2
100 pF
Power Supply Protection. The sensor contains an on-
chip voltage regulator and can operate over a wide supply
voltage range. For devices that need to operate from an
unregulated power supply, transient and double-battery
protection should be added externally. For applications
using a regulated supply, external EMI/RFI protection is
often required. Insufficient protection can result in unex-
plained pulses on the output line, providing inaccurate
sensing information to the user.
The filter capacitor and EMI protection circuitry can
easily be added to a PC board for use with these devices.
Provisions have been made for simple mounting of a
board on the back of the unit.
20 Ω
R1
C1
0.033 µF
0.22 µF
C3
1
2
3
4
Vcc
+
X
X-
Dwg. EH-008-1A
continued next page…
115 Northeast Cutoff, Box 15036
12
Worcester, Massachusetts 01615-0036 (508) 853-5000
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