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부품번호 3421 기능
기능 HALL-EFFECT/ DIRECTION-DETECTION SENSORS
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3421 데이터시트, 핀배열, 회로
3421 AND
3422
PRELIMINARY INFORMATION
(subject to change without notice)
September 6, 2000
E1 E2
XX
LOGIC
VCC
12 34 5
HALL-EFFECT,
DIRECTION-DETECTION SENSORS
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 µm, as
contrasted with 100 µm 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.
Dwg. PH-015
Pinning is shown viewed from branded side.
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.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . 18 V
Magnetic Flux Density, B . . . . Unlimited
Output OFF Voltage, VOUT . . . . . . . . VCC
Output Sink Current, IOUT . . . . . . . 30 mA
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range, TA
Suffix ‘EKA’ . . . . . . . -40˚C to +85˚C
Suffix ‘LKA’ . . . . . . -40˚C to +150˚C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65˚C to +170˚C
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
Always order by complete part number, e.g., A3421EKA .




3421 pdf, 반도체, 판매, 대치품
3421 AND 3422
HALL-EFFECT,
DIRECTION-DETECTION
SENSORS
MAGNETIC CHARACTERISTICS over operating voltage range.
A3421xKA
Characteristic
Symbol Test Conditions Min. Typ. Max.
A3422xKA
Min. Typ. Max.
Operate Point
BOP TA = -40°C
140 185 300
29
85
TA = +25°C
130 160 280
29
75
TA = Maximum
120
260
75
Release Point3
BRP TA = -40°C
-300 -190 -140 -85
-19
TA = +25°C
-280 -175 -130 -75
-18
TA = Maximum -260 — -120 -75 -16
Hysteresis
Bhys
TA = -40°C
280 375
10
48
TA = +25°C
260 335
10
46
TA = Maximum
240
10
Operate Differential
BOP1 - BOP2
— — ±80 — — ±60
Release Differential
BRP1 - BRP2
— — ±80 — — ±60
NOTES:1. Magnetic flux density is measured at most sensitive area of device,
nominally located 0.014” (0.37 mm) below the branded face of the package.
2. Typical Data is at VCC = 12 V and TA = +25°C and is for design information only.
3. As used here, negative flux densities are defined as less than zero (algebraic convention).
Units
G
G
G
G
G
G
G
G
G
G
G
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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3421 전자부품, 판매, 대치품
3421 AND 3422
HALL-EFFECT,
DIRECTION-DETECTION
SENSORS
FUNCTIONAL DESCRIPTION
The integrated circuit contains an internal voltage regula-
tor that powers the Hall sensors and both the analog and
digital circuitry. This regulator allows operation over a
wide supply voltage range and provides some immunity to
supply noise. The device also contains CMOS logic
circuitry that decodes the direction of rotation of the ring
magnet.
Quadrature/Direction Detection. Internal logic
circuitry provides outputs representing speed and direction
of the magnetic field across the face of the package. For
the direction signal to be appropriately updated, a quadra-
ture relationship must be maintained between the ring
magnet pole width*, the sensor-to-sensor spacing, and, to a
lesser extent, the magnetic switch points. For optimal
design, the sensor should be actuated with a ring magnet
pole width* two times the sensor-to-sensor spacing. This
will produce a sinusoidal magnetic field whose period
(denoted as Τ) is then four times the sensor-to-sensor
spacing. A quadrature relationship can also be maintained
for a ring magnet that has a period that satisfies the rela-
tionship nΤ/4 = 1.5 mm, where n is any odd integer.
Therefore, ring magnets with pole-pair spacings equal to 6
mm (n = 1), 2 mm (n = 3), 1.2 mm (n = 5), etc. are permit-
ted.
The response of the device to the magnetic field
produced by a rotating ring magnet is shown on page 2.
Note the phase shift between the two integrated sensors.
Outputs. The device provides three saturated outputs:
DIRECTION, E1 OUTPUT, and SPEED. DIRECTION
provides the direction output of the sensor and is defined
as OFF (high) for the direction E1 to E2 and ON (low) for
the direction E2 to E1. SPEED provides an XOR’d output
of the two sensors. Because of internal delays, DIREC-
TION will always be updated before SPEED and is
updated at every transition of E1 OUTPUT and E2 OUT-
PUT (internal) allowing the use of up-down counters
without the loss of pulses.
Power-On State. At power on, the logic circutry is reset
to provide an OFF (high) at DIRECTION and an OFF
(high) for E1 and E2 (internal) for magnetic fields less
than BOP. This eliminates ambiguity when the device is
powered up and either sensor detects a field between BOP
and BRP. If either sensor is subjected to a field greater than
BOP, the internal logic will set accordingly.
* “Pole” refers to a single pole (North or South) unless
stated as “pole pair” (North and South).
www.allegromicro.com

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