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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 m, as contrasted with 100 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 -40C to +85C, suffix `L-' is for the automotive and military temperature range of -40C to +150C. The 5-pin `KA' SIP package provides a cost-competitive solution to linear magnetic sensing in harsh environments.
Data Sheet 27650.1
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 . . . . . . . . VCC Output Sink Current, IOUT . . . . . . . 30 mA Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . 500 mW Operating Temperature Range, TA Suffix `EKA' . . . . . . . -40C to +85C Suffix `LKA' . . . . . . -40C to +150C Storage Temperature Range, TS . . . . . . . . . . . . . . . -65C to +170C
SPEED
FEATURES
I I I I
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
OUTE1
OUTE2 (INTERNAL)
SPEED (OUTE1 XOR OUT E2)
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 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 VOUT(SAT) POS VCC(UV) VCC(hys) tpo tr tf td ICC Test Conditions Operating, TJ < 165C1 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 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 A V -- V V s ns ns s 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 = +25C and is for design information only.
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
0.6
0.5
0.4
0.3
RJA = 164C/W
0.2
0.1
0 25 50 75 100 125 TEMPERATURE IN C 150 175
Dwg. GH-069
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3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
MAGNETIC CHARACTERISTICS over operating voltage range.
A3421xKA Characteristic Operate Point Symbol BOP Test Conditions TA = -40C TA = +25C TA = Maximum Release Point3 BRP TA = -40C TA = +25C TA = Maximum Hysteresis Bhys TA = -40C TA = +25C 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 -- -- -- 80 80 Min. -- -- -- -85 -75 -75 10 10 10 -- -- A3422xKA Typ. 29 29 -- -19 -18 -16 48 46 -- -- -- Max. 85 75 75 -- -- -- -- -- -- 60 60 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 = +25C 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
Dwg. GH-026-2
AMBIENT TEMPERATURE IN C
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
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3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
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 = 25C 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
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
FUNCTIONAL DESCRIPTION
The integrated circuit contains an internal voltage regulator 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 quadrature 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 ) 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 relationship n/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 permitted. 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, DIRECTION will always be updated before SPEED and is updated at every transition of E1 OUTPUT and E2 OUTPUT (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).
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3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
APPLICATIONS INFORMATION
Operation with Fine-Pitch Ring Magnets. For targets with a circular pitch of less than 4 mm, a performance improvement can be observed by rotating the front face of the sensor subassembly (see below). This sensor rotation decreases the effective sensor-to-sensor spacing, provided that the Hall elements are not rotated beyond the width of the target. Applications. It is strongly recommended that an external 0.01 F bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the internal logic. The simplest form of magnet that will operate these devices is a ring magnet. Other methods of operation, such as linear magnets, are possible. Extensive applications information on magnets and Hall-effect sensors is also available in the "Hsall-Effect IC Applications Guide" which can be found in the latest issue of the Allegro MicroSystems Electronic Data Book, AMS-702 or Application Note 27701, or at
www.allegromicro.com
0.059" 1.50 mm
TARGET FACE WIDTH, F >1.50 SIN (mm) >0.059 SIN (inch)
1.50 COS (mm) 0.059 COS (inch)
Rotated sensor for fine-pitch ring magnets
3
A
1 2
A
1 2 3 4 5
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
4 5
Dwg. MH-024
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted.
Qualification Test Temperature Humidity Bias Life Bias Life (Surge Operating Life) Autoclave, Unbiased High-Temperature (Bake) Storage Life Temperature Cycle ESD, Human Body Model Test Method and Test Conditions JESD22-A101, TA = 85C, RH = 85% JESD22-A108, TA = 150C, TJ = 165C JESD22-A108, TA = 175C, TJ = 190C JESD22-A102, TA = 121C, 15 psig JESD22-A103, TA = 170C JESD22-A104 CDF-AEC-Q100-002 Test Length 1000 hrs 1000 hrs 1000 hrs 96 hrs 1000 hrs 1000 cycles Pre/Post Reading Samples Per Lot 77 77 77 77 77 77 3 per test -55C to +150C Test to failure All leads > 8 kV Comments Device biased for minimum power
SENSOR LOCATIONS
(0.005" [0.13 mm] die placement)
ACTIVE AREA DEPTH 0.014" 0.37 mm NOM
0.059" 1.50 mm
0.096" 2.44 mm
0.072" 1.83 mm E1 E2
A
BRANDED SURFACE 1 2 3 4 5
Dwg. MH-007-1
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3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
PACKAGE DESIGNATOR 'KA' Dimensions in Inches
(controlling dimensions)
0.252 0.247
Dimensions in Millimeters
(for reference only)
6.40 6.27
0.063 0.059
1.60 1.50
0.181 0.176 45 0.018
4.60 4.47 45 0.46
0.083
MAX
1
2
3
4
5
2.11
MAX
1
2
3
4
5
0.600 0.560
0.0173 0.0138
15.24 14.23
0.44 0.35
SEE NOTE
SEE NOTE
0.0189 0.0142
0.050
BSC
Dwg. MH-010H in
0.48 0.36
1.27
BSC
Dwg. MH-010H mm
SURFACE-MOUNT LEAD FORM (add `-TL' to part number)
0.095
0.005
2.41
0.13
0.002
MAX
0.051
MAX
0.004 0-8
MAX
0.020
MIN FLAT
Dwg. MH-015 in
0.10
MAX
0-8 0.51
MIN FLAT
Dwg. MH-015 mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor's option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
HALL-EFFECT SENSORS
Partial Part Number 3503 3507 3508 3515 3516 3517 3518 3060 3422 3059 3056 3058 3421 3054 3209 3210 3421 3422 3425 Avail. Oper. Characteristics at TA = +25C Temp. BOP max BRP min Bhys typ Features Notes RATIOMETRIC, LINEAR HALL-EFFECT SENSORS S typ. 1.3 mV/G E/L typ. 2.5 mV/G S typ. 2.5 mV/G E/L typ. 5.0 mV/G chopper stabilized E/L typ. 2.5 mV/G chopper stabilized L/S typ. 5.0 mV/G chopper stabilized L/S typ. 2.5 mV/G chopper stabilized GEARTOOTH/RING MAGNET (DUAL ELEMENT) HALL-EFFECT SENSORS in order of BOP K/S E/L K/S E/L E/L E/L K/S E E E/L E/L L +35 +75 +100 +150 +250 +280 -35 -75 -100 -150 -250 -280 30 46 130 50 200 335 ac coupled direction detection ac coupled zero-speed zero-speed direction detection 4
SPECIAL-PURPOSE HALL-EFFECT SENSORS +300 +5.0 50 unipolar switch, multiplexed 60 5.0 7.7 400 W, chopper stabilized 60 5.0 7.7 25 W, chopper stabilized +280 -280 335 direction detection +85 -85 46 direction detection +24 -24 19 dual, chopper stabilized
1
Operating Temperature Ranges: S = -20C to +85C, E = -40C to +85C, J = -40C to +115C, K = -40C to +125C, L = -40C to +150C Notes 1. Protected. 4. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition.
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3421 AND 3422 HALL-EFFECT, DIRECTION-DETECTION SENSORS
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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