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3
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1185 and A1186
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature ranges, 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 >B
OP
for A1185; B <B
RP
for A1186
5
–
6.9
mA
I
CC(H)
B >B
OP
for A1186; B <B
RP
for A1185
12
–
17
mA
Supply Zener Clamp Voltage
V
ZSupply
I
CC
= I
CC(L)(Max)
+ 3 mA; T
A
= 25°C
28
–
40
V
Supply Zener Clamp Current
3
I
ZSupply
V
Supply
= 28 V
–
–
9.9
mA
Reverse Supply Current
I
RCC
V
RCC
= –18 V
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
–
–
1.6
mA
Output Slew Rate
4
di/dt
–
36
–
mA/
μ
s
Chopping Frequency
f
C
–
200
–
kHz
Power-On Time
5
t
on
After factory trimming; with and without
bypass capacitor (C
BYP
= 0.01
μ
F)
t
on
≤
t
on(max)
;
V
CC
slew rate > 25 mV/
μ
s
–
–
25
μ
s
Power-On State
6,7
POS
–
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
μ
F. 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 /
μ
s or greater. Operation with a V
CC
slew rate less than 25 mV /
μ
s can permanently harm
device performance.
7
POS is undefined for t > t
on
or B
RP
< B < B
OP
.
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Programmable Operate Point Range
B
OPrange
I
CC
= I
CC(L)
for A1185
I
CC
= I
CC(H)
for A1186
V
CC
= 12 V
10
–
60
G
Initial Operate Point Range
B
OPinit
–
–10
10
G
Switchpoint Step Size
2
B
RES
V
CC
= 5 V, T
A
= 25°C
2
4
6
G
Number of Programming Bits
–
Switchpoint setting
–
5
–
Bit
Programming locking
–
1
–
Bit
Temperature Drift of B
OP
Δ
B
OP
–
–
±20
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.