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參數(shù)資料
| 型號： | 3421 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | HALL-EFFECT, DIRECTION-DETECTION SENSORS |
| 中文描述： | 霍爾效應，方向檢測傳感器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 160K |
| 代理商： | 3421 |
The A3421xKA and A3422xKA Hall-effect, direction-detection
sensors are a new generation of special-function integrated sensors that
are capable of sensing the direction of rotation of a ring magnet. These
transducers provide separate digital outputs that provide information on
magnet rotation speed, direction, and magnet pole count. These devices
eliminate 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
μ
m, as
contrasted with 100
μ
m or worse mechanical location tolerance when
manufactured discretely. These highly sensitive, temperature-stable,
magnetic transducers are ideal for use in digital-encoder systems in the
harsh environments of automotive or industrial applications. The
A3421xKA is a high-hysteresis device designed for low-resolution
pulse counting while the A3422xKA is a high-sensitivity device
optimized for use with high-density magnets.
The A3421xKA and A3422xKA monolithic integrated circuits
contain two independent Hall-effect latches whose digital outputs are
internally coupled to CMOS logic circuitry that decodes signal speed
and direction. Extremely 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 these devices from a 4.5 V to 18 V supply. Both devices have
standard open-collector outputs; the logic operation of both devices is
the same.
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-com-
petitive solution to linear magnetic sensing in harsh environments.
FEATURES
I
Internal Direction-Decoding Circuitry
I
Two Matched Hall Latches On A Single Substrate
I
Superior Temperature Stability
I
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, e.g.,
A3421EKA
.
X
VCC
1
4
3
2
5
Dwg. PH-015
S
D
G
E
S
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 ‘EKA’. . . . . . .
-40C to +85C
Suffix ‘LKA’. . . . . .
-40C to +150C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-65C to +170C
3421
AND
3422
PRELIMINARY INFORMATION
(subject to change without notice)
September 6, 2000
D
2
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