A1242 ALLEGRO [Allegro MicroSystems], A1242 Datasheet - Page 3

• Manufacturer Part Number: A1242
• Description: Two-Wire Chopper-Stabilized Hall Effect Latch
• Manufacturer: ALLEGRO [Allegro MicroSystems]

1
limits.
2
3
4
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.
5
6
7
magnetic fields. This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative
strength of the field is indicated by the absolute value of B, and the sign indicates the polarity of the field (for example, a –100 G field and
a 100 G field have equivalent strength, but opposite polarity).
A1242-DS
ELECTRICAL CHARACTERISTICS
Electrical Characteristics
Supply Voltage
Supply Current
Output Slew Rate
Chopping Frequency
Power-On Time
Power-On State
Supply Zener Clamp Voltage
Supply Zener Current
Reverse Battery Current
Magnetic Characteristics
Operate Point
Release Point
Hysteresis
Typical values are at T
The value of dI is the difference between 90% of I
Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
V
For t > t
Maximum current limit is equal to the maximum I
Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for south-polarity
CC
represents the generated voltage between the V
PO(max)
Characteristic
2 3
5
, and B
4
6
RP
A
7
= 25°C and V
< B < B
Two-Wire Chopper-Stabilized Hall Effect Latch
OP
, POS is undefined.
EMC (Electromagnetic Compatibility) PERFORMANCE
V
Symbol
I
CC
Z(supply)
Z(supply)
I
I
B
POS
CC(H)
dI/dt
I
V
CC(L)
B
B
t
RCC
f
PO
HYS
CC
OP
RP
C
= 12 V. Performance may vary for individual units, within the specified maximum and minimum
over full operating voltage and temperature ranges, unless otherwise specified
DEVICE QUALIFICATION PROGRAM
Operating, T
-I1, B < B
-I2, B < B
-I1 and -I2, B > B
R
V
t
I
V
V
South pole adjacent to branded face of device
North pole adjacent to branded face of device
B
CCL(max)
CC(H)
PO
CC
CC
S
RCC
OP
S
Contact Allegro for information.
Contact Allegro for information.
= 28 V
= 100 Ω, C
< t
= 20 mA; T
> V
– B
CC
= –18 V
PO(max)
and 10% of I
CC(MIN)
RP
pin and the GND pin.
RP
RP
+ 3 mA.
J
A1242
, dV
< 165°C
S
A
= 20 pF, no bypass capacitor
= 25°C
CC
OP
Test Conditions
/ dt > 25 mV / μs
CC(L)
, and the value of dt is time period between those two points.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Min.
–80
3.5
12
28
40
5
2
–
–
–
–
–
–
5
Typ.
I
CC(H)
200
–32
36
32
64
–
–
–
–
–
–
–
–
1
Max.
110
6.9
2.5
24
17
25
20
80
–5
5
–
–
–
–
mA/μs
Units
kHz
mA
mA
mA
mA
mA
μs
V
V
G
G
G
–
3