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A1140 Datasheet(PDF) 3 Page - Allegro MicroSystems

Part No. A1140
Description  Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1140 Datasheet(HTML) 3 Page - Allegro MicroSystems

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A1140-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140/41/42/43
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
VCC
Device powered on
3.5
24
V
Supply Current1
ICC(L)
B >BOP for A1140; B <BRP for A1141
2
5
mA
B >BOP for A1142; B <BRP for A1143
5
6.9
mA
ICC(H)
B >BOP for A1141, A1143
B <BRP for A1140, A1142
12
17
mA
Zener Clamp Supply Voltage
VZ(supply)
ICC = ICC(max) + 3 mA; TA = 25°C
28
40
V
Zener Clamp Supply Current2
IZ(supply)
VZ(supply) = 28 V
10
mA
Output Slew Rate3
di/dt
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
36
mA/µs
Chopping Frequency
fC
400
kHz
Power-On Time4
ton
After factory programming; with and without
bypass capacitor (CBYP = 0.01 µF)
––
25
µs
Power-On State5
POS
ton ≤ ton(max); VCC slew rate ≥ 25 mV/µs
HIGH
1Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
2The maximum value for IZ(supply) is equal to ICC(L)MAX + 3 mA.
3The value of di is the difference between 90% of ICC(H) and 10% of ICC(L), and the value of dt is time period between those two points. The value of di/dt
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in lower rates of change.
4The value of ton depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in longer ton.
5A V
CC slew rate less than 25 mV/µs affects device performance, both while powering-on and while running. For ton > ton(max), and BRP < B < BOP, POS
is undefined.
MAGNETIC CHARACTERISTICS* over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
BOP
ICC(H) → ICC(L) for A1140, A1142
ICC(L) → ICC(H) for A1141, A1143
50
85
115
G
Release Point
BRP
ICC(L) → ICC(H) for A1140, A1142
ICC(H) → ICC(L) for A1141, A1143
45
110
G
Hysteresis
BHYS
BHYS = BOP – BRP
515
30
G
*Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).


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