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DIRECTION-DETECTION SENSORS. 3422 Datasheet

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DIRECTION-DETECTION SENSORS. 3422 Datasheet






3422 SENSORS. Datasheet pdf. Equivalent




3422 SENSORS. Datasheet pdf. Equivalent





Part

3422

Description

DIRECTION-DETECTION SENSORS



Feature


3422 PRELIMINARY INFORMATION (subject to change without notice) Februaryt 21, 2003 HALL-EFFECT, DIRECTION-DETECTION SENSORS The A3422xKA Hall-effect, direc tion-detection sensor is a new generati on of special-function integrated senso rs that is capable of sensing the direc tion of rotation of a ring magnet. This transducer provides separate digital o utputs that provid.
Manufacture

Allegro MicroSystems

Datasheet
Download 3422 Datasheet


Allegro MicroSystems 3422

3422; e information on magnet rotation speed, direction, and magnet pole count. This device eliminates the major manufacturi ng hurdles encountered in fine-pitch di rection-detection applications, namely maintaining accurate mechanical locatio n between the two active Hall elements. Here, the two Hall elements are photol ithographically aligned to better than 1 µm, as contraste.


Allegro MicroSystems 3422

d with 100 µm or worse mechanical locat ion tolerance when manufactured discret ely. This highly sensitive, temperature -stable, magnetic transducer is ideal f or use in digital-encoder systems in th e harsh environments of automotive or i ndustrial applications. The A3422xKA is a high-sensitivity device optimized fo r use with highdensity magnets. The A34 22xKA monolithic in.


Allegro MicroSystems 3422

tegrated circuit contains two indepenwww .DataSheet4U.com dent Hall-effect latch es whose digital outputs are internally coupled to CMOS logic circuitry that d ecodes signal speed and direction. Extr emely low-drift BiCMOS circuitry is use d for the amplifiers to ensure symmetry between the two latches so that signal quadrature can be maintained. An on-ch ip voltage regulat.

Part

3422

Description

DIRECTION-DETECTION SENSORS



Feature


3422 PRELIMINARY INFORMATION (subject to change without notice) Februaryt 21, 2003 HALL-EFFECT, DIRECTION-DETECTION SENSORS The A3422xKA Hall-effect, direc tion-detection sensor is a new generati on of special-function integrated senso rs that is capable of sensing the direc tion of rotation of a ring magnet. This transducer provides separate digital o utputs that provid.
Manufacture

Allegro MicroSystems

Datasheet
Download 3422 Datasheet




 3422
3422
PRELIMINARY INFORMATION
HALL-EFFECT,
(subject to change without notice) DIRECTION-DETECTION SENSORS
Februaryt 21, 2003
E1 E2
XX
LOGIC
VCC
12 34 5
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 µm, as
contrasted with 100 µm 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.
Dwg. PH-015
Pinning is shown viewed from branded side.
The A3422xKA monolithic integrated circuit contains two indepen-
denwtwHw.DaatlalS-heeeft4fUe.ccomt 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.
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 ‘E–’ . . . . . . . . . -40˚C to +85˚C
Suffix ‘L–’ . . . . . . . . -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-
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
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 .




 3422
3422
HALL-EFFECT,
DIRECTION-DETECTION
SENSOR
FUNCTIONAL BLOCK DIAGRAM
1 SUPPLY
UVLO
REG
POWER-ON
LOGIC
2 DIRECTION
3 GROUND
4 E1 OUTPUT
X
E1
E2
X
5 SPEED
+B
0
-B
+B BOP2
0
-B
OUT E1
OUT E2
(INTERNAL)
SPEED
(OUTE1 XOR OUT E2)
DIRECTION
Dwg. WH-012A
2
TIMING DIAGRAM
BOP1
BRP1
BRP2
Dwg. FH-018
td
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2001, 2003 Allegro MicroSystems, Inc.




 3422
3422
HALL-EFFECT,
DIRECTION-DETECTION
SENSOR
ELECTRICAL CHARACTERISTICS over operating temperature range.
Characteristic
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Power-On State
Under-Voltage Lockout
Under-Voltage Hysteresis
Power-On Time
Output Rise Time
Output Fall Time
Direction Change Delay
Supply Current
Symbol Test Conditions
VCC
IOFF
VOUT(SAT)
POS
VCC(UV)
VCC(hys)
tpo
tr
tf
td
Operating, TJ < 165°C1
VOUT = VCC = 18 V
IOUT = 20 mA
VCC = 0 5 V,
BRP1 < B < BOP1, BRP2 < B < BOP2
IOUT = 20 mA, VCC = 0 5 V
Lockout (VCC(UV)) - Shutdown
VCC > 4.5 V
CL = 20 pF, RL = 820
CL = 20 pF, RL = 820
CL = 20 pF, RL = 820
ICC VCC = 8 V, All outputs OFF
Min.
4.5
OFF
0.5
5.0
Limits
Typ. Max.
— 18
<1.0 10
0.21 0.50
OFF OFF
3.5 —
0.5 —
— 50
200 —
200 —
1.0 5.0
9.0 18
NOTES:1. Maximum supply voltage must be adjusted for power dissipation and ambient temperature.
2. Typical Data is at VCC = 12 V and TA = +25°C and is for design information only.
Units
V
µA
V
V
V
µs
ns
ns
µs
mA
0.6
0.5
0.4
0.3
RθJA = 164°C/W
0.2
0.1
0
25 50
75 100 125 150 175
TEMPERATURE IN °C
Dwg. GH-069
www.allegromicro.com
3






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