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Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
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 speci ed
Characteristic
Symbol
Test Conditions
Min.   Typ.   Max.   Units
Programmable Operate Point Range  B
OPrange
I
CC
 = I
CC(H)
  for A1180 and A1182
I
CC
 = I
CC(L)
  for A1181 and A1183
60

200    G
Initial Operate Point Range
B
OPinit
V
CC
 = 12 V

33
60
G
Switchpoint Step Size
2
B
RES
V
CC
 = 5 V, T
A
 = 25癈
4
8
12
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  eld (or a weaker north polarity  eld, if present).
2
The range of values speci ed for B
RES
 is a maximum, derived from the cumulative programming bit errors.
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise speci ed
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 A1180; B
RP
 for A1181
2

5
mA
B >B
OP
 for A1182; B
RP
 for A1183
5

6.9    mA
I
CC(H)
B >B
OP
 for A1181, A1183
B
RP
 for A1180, A1182
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    I
Z(supply)
V
Z(supply)
 = 28 V


I
CC(L)(max)
+ 3 mA
mA
Reverse Supply Current
I
RCC
 V
RCC
 = 18 V

    1.6    mA
Output Slew Rate
3
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
4
t
on
After factory trimming; with and without
bypass capacitor (C
BYP
 = 0.01 糉)


25
約
Power-On State
5,6
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  eld (or a weaker north polarity  eld, if present).
3
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
 
4
Measured with and without bypass capacitor of 0.01 糉. Adding a larger bypass capacitor causes longer Power-On Time.
5
POS is de ned 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.
6
POS is unde ned for t > t
on
 or B
RP
 < B < B
OP
 .
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