Dual Channel Hall Effect Direction Detection Sensor IC
A3423
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS valid at T
A
= –40°C to 150°C, T
J
≤ T
J
(max), through full operating air gap range, unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ. Max. Units
Electrical Characteristics
Supply Voltage V
CC
Operating, T
J
≤ 165°C 3.8 – 24 V
Output Leakage Current I
OFF
All outputs V
OUT
≤ V
CC
(max) – <1 10 μA
Undervoltage Lockout V
CC(UV)
– – 3.7 V
Undervoltage Hysteresis V
CC(hys)
Lockout (V
CC(UV)
) – Shutdown – 0.4 – V
Output Rise Time t
r
C
LOAD
= 20 pF, R
LOAD
= 1 kΩ – 200 – ns
Output Fall Time t
f
C
LOAD
= 20 pF, R
LOAD
= 1 kΩ – 300 – ns
Supply Current I
CC
3.4 8.2 14 mA
Low Output Voltage V
sat
All outputs; I
OUT
= 15 mA; B > B
OP(A)
, B > B
OP(B)
– 210 500 mV
Output Current Limit I
OM
All outputs 30 – 60 mA
Speed Output Delay* t
d
Delay between direction changing and speed
output transition
0.5 2.5 5 μs
Power-on Time t
ON
B > B
OP
+ 5 G – 2 5 μs
Transient Protection Characteristics
Supply Zener Voltage V
Z(sup)
I
CC
= 17 mA, T
A
= 25°C 30 – – V
Output Zener Voltage V
Z(out)
I
OUT
= 3 mA, T
A
= 25°C 30 – – V
Supply Zener Current I
Z(sup)
V
supply
= 30 V, T
A
= 25°C – – 17 mA
Output Zener Current I
Z(out)
V
OUT
= 30 V, T
A
= 25°C – – 3 mA
Reverse Battery Current I
RCC
V
RCC
= –28 V, T
A
= 25°C – – 15 mA
Magnetic Characteristics
Operate Point (Channel A and Channel B) B
OP
B
(A)
> B
OP(A)
, B
(B)
> B
OP(B)
–35 15 55 G
Release Point (Channel A and Channel B) B
RP
B
(A)
< B
OP(A)
, B
(B)
< B
OP(B)
–55 –15 35 G
Hysteresis (Channel A and Channel B) B
hys
B
OP
– B
RP
10 30 60 G
Operate Symmetry SYM
OP(AB)
B
OP(A)
– B
OP(B)
–50 – 50 G
Release Symmetry SYM
RP(AB)
B
RP(A)
– B
RP(B)
–50 – 50 G
* Valid only after the first speed (SPD pin) signal transition. First speed signal transition has no delay.
