The A3422xKA Hall-effect, direction-detection sensor is a new
generation of special-function integrated sensors that is capable of
sensing the direction of rotation of a ring magnet. This transducer
provides separate digital outputs that provide information on magnet
rotation speed, direction, and magnet pole count. This device elimi-
nates the major manufacturing hurdles encountered in fine-pitch
direction-detection applications, namely maintaining accurate mechani-
cal location between the two active Hall elements. Here, the two Hall
elements are photolithographically aligned to better than 1
m, as
contrasted with 100
m or worse mechanical location tolerance when
manufactured discretely. This highly sensitive, temperature-stable,
magnetic transducer is ideal for use in digital-encoder systems in the
harsh environments of automotive or industrial applications. The
A3422xKA is a high-sensitivity device optimized for use with high-
density magnets.
The A3422xKA monolithic integrated circuit contains two indepen-
dent Hall-effect latches whose digital outputs are internally coupled to
CMOS logic circuitry that decodes signal speed and direction. Ex-
tremely low-drift BiCMOS circuitry is used for the amplifiers to ensure
symmetry between the two latches so that signal quadrature can be
maintained. An on-chip voltage regulator allows the use of this device
from a 4.5 V to 18 V supply. The outputs are standard open-collector
outputs.
Two operating temperature ranges are provided; suffix `E' is for
the automotive and industrial temperature range of -40
C to +85
C,
suffix `L' is for the automotive and military temperature range of
-40
C to +150
C. The 5-pin `KA' SIP package provides a cost-
competitive solution to magnetic sensing in harsh environments.
FEATURES
s
Internal Direction-Decoding Circuitry
s
Two Matched Hall Latches On A Single Substrate
s
Superior Temperature Stability
s
4.5 V to 18 V Operation
Electrically Defined Power-On State
Under-Voltage Lockout
HALL-EFFECT,
DIRECTION-DETECTION SENSORS
Always order by complete part number: the prefix `A' + the basic four-
digit part number + a suffix to indicate operating temperature range + a
suffix to indicate package style, e.g., A3422EKA .
X
V
CC
1
4
3
2
5
Dwg. PH-015
SUPPLY
DIRECTION
GROUND
E1 OUTPUT
SPEED
LOGIC
X
E1
E2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
. . . . . . . . . . . . . 18 V
Magnetic Flux Density, B . . . . Unlimited
Output OFF Voltage, V
OUT
. . . . . . . . V
CC
Output Sink Current, I
OUT
. . . . . . . 30 mA
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range, T
A
Suffix `E' . . . . . . . . . -40C to +85C
Suffix `L' . . . . . . . . -40C to +150C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . -65C to +170C
3422
PRELIMINARY INFORMATION
(subject to change without notice)
Februaryt 21, 2003
Data Sheet
27650.1A*
3422
HALL-EFFECT,
DIRECTION-DETECTION
SENSOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
T
A
= -40
C
--
--
85
G
T
A
= +25
C
--29
75
G
T
A
= Maximum
----75
G
Release Point
3
B
RP
T
A
= -40
C
-85
---- G
T
A
= +25
C
-75
-17
--G
T
A
= Maximum
-75
---- G
Hysteresis
B
hys
T
A
= -40
C
10
--
--
G
T
A
= +25
C
10
46
--
G
T
A
= Maximum
10
---- G
Operate Differential
--B
OP1
- B
OP2
--
--
60
G
Release Differential
--B
RP1
- B
RP2
--
--
60
G
MAGNETIC CHARACTERISTICS over operating voltage range.
NOTES: 1. Magnetic flux density is measured at most sensitive area of device,
nominally located 0.0165" (0.42 mm) below the branded face of the package.
2. Typical Data is at V
CC
= 12 V and T
A
= +25
C and is for design information only.
3. As used here, negative flux densities are defined as less than zero (algebraic convention).
Typical Magnetic Characteristics
0
50
100
AMBIENT TEMPERATURE IN
C
-50
Dwg. GH-026-1
SWITCH POINTS IN GAUSS
0
10
OPERATE POINT
RELEASE POINT
150
-25
25
75
125
20
30
40
50
-50
-40
-30
-20
-10
V = 8 V
CC
0
25
50
75
100
AMBIENT TEMPERATURE IN
C
-50
Dwg. GH-051-1
125
-25
HYSTERESIS IN GAUSS
20
0
150
80
100
60
40
V = 8 V
CC
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