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Part: A3422EKA-TL
Category:
Description: Hall-effect, Direction-detection Sensor
Company: Allegro Micro Systems, Inc.
Datasheet: Download A3422EKA-TL datasheet File size : 116 kB
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Datasheet text preview:
3422
PRELIMINARY INFORMATION
(subject to change without notice)
Februaryt 21, 2003
HALL-EFFECT, DIRECTION-DETECTION SENSORS
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 eliminates 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. 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 highdensity magnets. The A3422xKA monolithic integrated circuit contains 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 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 costcompetitive solution to magnetic sensing in harsh environments.
Data Sheet 27650.1A*
E1
E2
X
X
LOGIC
VCC
1
2
3
4
5
DIRECTION
GROUND
E1 OUTPUT
SUPPLY
Dwg. PH-015
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . 18 V Magnetic Flux Density, B . . . . Unlimited Output OFF Voltage, VOUT . . . . . . . . V CC 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
SPEED
FEATURES
s s s s
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: the prefix `A' + the basic fourdigit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3422EKA .
3422 HALL-EFFECT, DIRECTION-DETECTION SENSOR
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)
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2001, 2003 Allegro MicroSystems, Inc.
3422 HALL-EFFECT, DIRECTION-DETECTION SENSOR
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
www.allegromicro.com
3
3422 HALL-EFFECT, DIRECTION-DETECTION SENSOR
MAGNETIC CHARACTERISTICS over operating voltage range.
Limits 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. -- -- -- -85 -75 -75 10 10 10 -- -- Typ. -- 29 -- -- -17 -- -- 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 0.0165" (0.42 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).
Typical Magnetic 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
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3422 HALL-EFFECT, DIRECTION-DETECTION SENSOR
Typical Electrical Characteristics
300
10
250
I OUT = 20 mA
V =8V CC 9.0
SATURATION VOLTAGE IN mV
200
SUPPLY CURRENT IN mA
ALL OUTPUTS ON
150
8.0
100
ALL OUTPUTS OFF 7.0
50
0 -50 -25 0 25 50 75 100 125 150
6.0 -50 -25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE IN ° C
Dwg. GH-029-2
AMBIENT TEMPERATURE IN ° C
Dwg. GH-053-1
13
12
T = 25°C A
11
SUPPLY CURRENT IN mA
10 ALL OUTPUTS ON 9.0
8.0 ALL OUTPUTS OFF 7.0
6.0
5.0 2.0 6.0 10 14 18
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058-3
www.allegromicro.com
5
Others parts begin by a3
A3-1 A3-2 A3-3 A3-4
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