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Part: A3421LKA-TL
Category:
Description: Hall-effect,direction-detection Sensor
Company: Allegro Micro Systems, Inc.
Datasheet: Download A3421LKA-TL datasheet File size : 116 kB
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Datasheet text preview:
3421 AND 3422
PRELIMINARY INFORMATION
(subject to change without notice)
September 6, 2000
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 mechanical 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.
Data Sheet 27650.1
E1
E2
X
X
LOGIC
VCC
1
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . 18 V Magnetic Flux Density, B . . . . Unlimited Output OFF Voltage, VOUT . . . . . . . .
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
D Re
aU is D ; AO A K R xK xP2 1 42 ED 342 et. 3U A she AN e eI h T y th ta T N b da O ced ter C la la IS p e
2 3 4 5
T C
DIRECTION
GROUND
E1 OUTPUT
SUPPLY
SPEED
Dwg. PH-015
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.
V CC
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 costcompetitive solution to linear magnetic sensing in harsh environments.
FEATURES
s s s s
se
Internal Direction-Decoding Circuitry Two Matched Hall Latches On A Single Substrate Superior Temperature Stability 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 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
FUNCTIONAL BLOCK DIAGRAM
1
SUPPLY
2
DIRECTION
UVLO
REG
LOGIC
POWER-ON LOGIC
3
GROUND
4
E1 OUTPUT
E2
X
E1
X
5
SPEED
Dwg. FH-018
TIMING DIAGRAM
CHANGE IN DIRECTION
td DIRECTION
Dwg. WH-012A
+B 0
BOP1 BRP1
-B +B 0 BRP2 -B BOP2
OUT E1
OUT E2 (INTERNAL)
SPEED (OUT E1 XOR OUT E2)
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1999 Allegro MicroSystems, Inc.
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits 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 VCC IOFF V OUT(SAT) POS V CC(UV) VCC(hys) t po tr tf td I CC Test Conditions Operating, TJ 4.5 V CL = 20 pF, RL = 820 CL = 20 pF, RL = 820 CL = 20 pF, RL = 820 VCC = 8 V, All outputs OFF Min. 4.5 -- -- OFF -- -- -- -- -- 0.5 5.0 Typ. -- <1.0 0.21 OFF 3.5 0.5 -- 200 200 1.0 9.0 Max. 18 10 0.50 OFF -- -- 50 -- -- 5.0 18 Units V µA V -- V V µs ns ns µs mA
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.
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
0.6
0.5
0.4
0.3
RJA = 164°C/W
0.2
0.1
0 25 50 75 100 125 TEMPERATURE IN ° C 150 175
Dwg. GH-069
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
MAGNETIC CHARACTERISTICS over operating voltage range.
A3421xKA Characteristic Operate Point Symbol B OP Test Conditions TA = -40°C TA = +25°C TA = Maximum Release Point3 B RP TA = -40°C TA = +25°C TA = Maximum Hysteresis B hys TA = -40°C TA = +25°C TA = Maximum Operate Differential Release Differential BOP1 - BOP2 BRP1 - BRP2 Min. 140 130 120 -300 -280 -260 280 260 240 -- -- Typ. 185 160 -- -190 -175 -- 375 335 -- -- -- Max. 300 280 260 -140 -130 -120 -- -- -- ±8 0 ±8 0 Min. -- -- -- -85 -75 -75 10 10 10 -- -- A3422xKA Typ. 29 29 -- -19 -18 -16 48 46 -- -- -- Max. 85 75 75 -- -- -- -- -- -- ±6 0 ±6 0 Units G G G G G G G G G G G
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).
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
TYPICAL A3421xKA CHARACTERISTICS
250 200 150 OPERATE POINT
400 V =8V CC 500
SWITCH POINTS IN GAUSS
50 0 -50 -100 -150 -200 -250 -50 -25 0 25 50 75 100 125 150 RELEASE POINT V =8V CC
HYSTERESIS IN GAUSS
100
300
200
100
0 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN ° C
AMBIENT TEMPERATURE IN ° C
Dwg. GH-026-2
Dwg. GH-051-2
TYPICAL A3422xKA CHARACTERISTICS
50 40 30 OPERATE POINT
100
80
V =8V CC
SWITCH POINTS IN GAUSS
HYSTERESIS IN GAUSS
20 10 0 -10 RELEASE POINT -20 -30 -40 -50 -50 -25 0 25 50 75 100 125 150 V =8V CC
60
40
20
0 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN ° C
AMBIENT TEMPERATURE IN ° C
Dwg. GH-026-1
Dwg. GH-051-1
Others parts begin by a3
A3-1 A3-2 A3-3 A3-4
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