ATS660LSB データシートの表示（PDF） - Allegro MicroSystems
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ATS660LSB Datasheet PDF : 16 Pages
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ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
APPLICATIONS INFORMATION — Continued
Operation from a regulated power supply. These
devices require minimal protection circuitry during
operation from a low-voltage regulated line. The on-chip
voltage regulator provides immunity to power supply
variations between 4.5 V and 26.5 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 processor input.
Operation from an unregulated power supply. In
automotive applications, where the device receives its
power from an unregulated supply such as the battery, full
protection is generally required so that the device can
withstand the many supply-side transients. Specifications
for such transients vary between car manufacturers, and
protection-circuit design should be optimized for each
application.
In the circuit shown, a standard protection circuit is
constructed using discrete components. The Zener diode
is used to provide over-voltage protection against load
dumps greater than about 40 V; for load dumps less than
about 40 V, the internal Zener is sufficient. The series
resistor (R ) provides current limiting and with the capaci-
tor (C ) no1ise filtering. The Zener diode and current-
limitin1g resistor should be sized for power dissipation
requirements. The series diode protects the external Zener
diode against reverse battery and provides protection
against transients greater than -24 V; it must be rated to
withstand the most negative transient. In many transmis-
sion applications there is already a Zener diode in the
TCU, and the diode and external Zener are not necessary.
SUPPLY
RL
OUTPUT
C2
100 pF
20 Ω
R1
C1
0.1 µF
1
2
3
4
Vcc
+
X
X-
Dwg. EH-008-7
Operation from regulated supply
SUPPLY
RL
R1
OUTPUT
C2
100 pF
C1
1
2
3
4
Vcc
+
X
X-
Dwg. EH-008-6
Operation from unregulated supply
115 Northeast Cutoff, Box 15036
10
Worcester, Massachusetts 01615-0036 (508) 853-5000
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