Standard Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switch
A1184
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.   Typ.   Max.   Units
Programmable Operate Point Range  B
OPrange
I
CC
= I
CC(H)
300
600    G
Initial Operate Point Range
B
OPinit
V
CC
= 12 V
262    300    G
Switchpoint Step Size
2
B
RES
V
CC
= 5 V, T
A
= 25癈
8
16
24
G
Number of Programming Bits
Switchpoint setting
5
Bit
Programming locking
1
Bit
Temperature Drift of B
OP
B
OP
?0    G
Hysteresis
B
HYS
B
HYS
= B
OP
B
RP
5
15
30
G
1
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).
2
The range of values specified for B
RES
is a maximum, derived from the cumulative programming bit errors.
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.   Typ.   Max.   Units
Supply Voltage
1
V
CC
Device powered on
3.5
24
V
Supply Current
2
I
CC(L)
B
RP
5
6.9    mA
I
CC(H)
B >B
OP
12
17    mA
Supply Zener Clamp Voltage    V
Z(supply)
I
CC
= I
CC(L)(max)
+ 3 mA; T
A
= 25癈
28
40
V
Supply Zener Clamp Current
3
I
Z(supply)
V
Z(supply)
= 28 V
9.9    mA
Reverse Supply Current
I
RCC
V
RCC
= 18 V
    1.6    mA
Output Slew Rate
4
di/dt
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
36
    mA/約
Chopping Frequency
f
C
200
kHz
Power-On Time
5
t
on
After factory trimming; with and without
bypass capacitor (C
BYP
= 0.01 糉)
25
約
Power-On State
6,7
POS   t
on
d t
on(max)
; V
CC
slew rate e 25 mV/約
    HIGH    
1
V
CC
represents the generated voltage between the VCC pin and the GND pin.
2
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).
3
I
ZSUPPLY(max)
= I
CCL(max)
+ 3 mA.
4
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5
Measured with and without bypass capacitor of 0.01 糉. Adding a larger bypass capacitor causes longer Power-On Time.
6
POS is defined as true only with a V
CC
slew rate of 25 mV / 約 or greater. Operation with a V
CC
slew rate less than 25 mV / 約 can permanently harm
device performance.
7
POS is undefined for t > t
on
or B
RP
< B < B
OP
.