A1140 Allegro MicroSystems, A1140 Datasheet - Page 3

• Manufacturer Part Number: A1140
• Description: Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches
• Manufacturer: Allegro MicroSystems

A1140-DS
ELECTRICAL CHARACTERISTICS
Supply Voltage
Supply Current
Zener Clamp Supply Voltage
Zener Clamp Supply Current
Output Slew Rate
Chopping Frequency
Power-On Time
Power-On State
1
polarity; therefore greater B values indicate a stronger south polarity fi eld (or a weaker north polarity fi eld, if present).
2
3
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in lower rates of change.
4
5 A V
is undefi ned.
MAGNETIC CHARACTERISTICS*
Operate Point
Release Point
Hysteresis
*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 fi eld (or a weaker north polarity fi eld, if present).
Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
The maximum value for I
The value of di is the difference between 90% of I
The value of t
CC
slew rate less than 25 mV/µs affects device performance, both while powering-on and while running. For t
Characteristic
Characteristic
on
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
1
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in longer t
4
5
3
Z(supply)
2
is equal to I
V
Symbol
Symbol
I
Z(supply)
I
Z(supply)
I
POS
B
CC(H)
di/dt
V
CC(L)
B
B
t
f
HYS
on
CC
over the operating voltage and temperature range, unless otherwise specifi ed
OP
C
RP
CC(L)MAX
over the operating voltage and temperature range, unless otherwise specifi ed
CC(H)
Device powered on
B >B
B >B
B >B
B <B
I
V
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
After factory programming; with and without
bypass capacitor (C
t
I
I
I
I
B
+ 3 mA.
CC
on
CC(H)
CC(L)
CC(L)
CC(H)
Z(supply)
HYS
and 10% of I
≤ t
= I
A1140/41/42/43
OP
OP
OP
RP
= B
on(max)
→ I
→ I
→ I
→ I
CC(max)
for A1140; B <B
for A1142; B <B
for A1141, A1143
for A1140, A1142
= 28 V
OP
CC(H)
CC(H)
CC(L)
CC(L)
;
– B
V
CC(L)
+ 3 mA; T
Test Conditions
Test Conditions
CC
for A1140, A1142
for A1141, A1143
for A1140, A1142
for A1141, A1143
RP
slew rate ≥ 25 mV/µs
, and the value of dt is time period between those two points. The value of di/dt
BYP
A
RP
RP
= 0.01 µF)
= 25°C
for A1141
for A1143
Min.
Min.
3.5
12
28
50
45
2
5
–
–
–
–
–
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
on
> t
HIGH
on(max)
Typ.
Typ.
400
36
85
15
–
–
–
–
–
–
–
–
on
, and B
.
Max.
Max.
115
110
6.9
RP
24
17
40
10
25
30
5
–
–
–
< B < B
mA/µs
Units
Units
OP
kHz
mA
mA
mA
mA
µs
G
G
G
V
V
–
, POS
3