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3235 DUAL-OUTPUT HALL-EFFECT SWITCH
3235
DUAL-OUTPUT HALL-EFFECT SWITCH
Type UGN3235K Hall-effect sensors are bipolar integrated circuits designed for commutation of brushless dc motors, and other rotary encoding applications using multi-pole ring magnets. The device features two outputs which are independently activated by magnetic fields of opposite polarity. Each sensor IC includes a Hall voltage generator, two Schmitt triggers, a voltage regulator, output transistors, and on-board reverse polarity protection. The regulator enables these devices to operate from voltages ranging between 4.5 V and 24 V. On-chip compensation circuitry stabilizes the switch points over temperature. Each open-collector output is independently operated by the proper amount and polarity of incident magnetic flux. Output 1 responds only to the positive flux from the south pole of a magnet, Output 2 to the negative flux from the north pole of a magnet. When the sensor experiences the field of a south magnetic pole greater than the maximum operate point of Output 1, that output switches to the LOW state and Output 2 is unaffected. When the incident flux falls below the minimum release point for Output 1, that output returns to the HIGH state and Output 2 remains unchanged. Output 2 independently responds in the same manner to the negative flux from the north magnetic pole of a magnet. Figure 1 shows a zone in the region of 0 G, tH, where both outputs are in the HIGH or OFF state. This constitutes a delay that is independent of rate of change of the incident magnetic field and ensures that both outputs are never ON simultaneously. This is an essential feature for driving brushless dc motors with a minimum of reactive transient currents. The UGN3235K is supplied in a four-pin plastic single in-line package (SIP).
Data Sheet 27633A*
V CC
X
1
2
3
4
OUTPUT1
OUTPUT2
Dwg. PH-007
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C
Power Supply, VCC . . . . . . . . . . . . . . . . 25 V Reverse Battery Voltage, VRCC . . . . . -30 V Magnetic Flux Density, B . . . . . . Unlimited Output OFF Voltage, VOUT . . . . . . . . . . 25 V Output ON Current, IOUT . . . . . . . . . . 50 mA Operating Temperature Range, TA . . . . . . . . . . . . . . . . -20C to + 85C Storage Temperature Range TS . . . . . . . . . . . . . . . . -65C to +150C
GROUND
SUPPLY
FEATURES
s Reliable and Rugged Magnetic Sensing Switch s Two Outputs Independently Switched by North and South Poles s Independent Actuation of Outputs Minimizes Inductive-Load Reactive Transient s Built-in Hysteresis Minimizes Interference from Stray Fields s Operates from 4.5 V to 24 V s Outputs Compatible with All Logic Levels s On-Board Reverse Polarity Protection s Open-Collector, Active-Low Outputs
Always order by complete part number: UGN3235K .
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
FUNCTIONAL BLOCK DIAGRAM
1
VCC
2
OUTPUT 1
REG.
X
3 4
OUTPUT 2 GROUND
Dwg. FH-003A
ELECTRICAL CHARACTERISTICS at TA = +25C (unless otherwise noted).
Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf VCC = 24 V, IOUT = 20 mA VOUT = 24 V, VCC = 24 V VCC = 24 V, Output Open VCC = 14 V, RL = 820 , C L = 20 pF VCC = 14 V, R L = 820 , CL = 20 pF Test Conditions Min. 4.5 -- -- -- -- -- Typ. -- 160 -- 6.0 0.04 0.18 Max. 24 400 1.0 8.0 0.4 0.4 Units V mV A mA s s
MAGNETIC CHARACTERISTICS at VCC = 4.5 V to 24 V
Characteristic Operate Point, BOP Test Conditions TA = +25C TA = -20C to +85C Release Point, BRP TA = +25C TA = -20C to +85C Hysteresis, Bhys TA = +25C TA = -20C to +85C Output Q1 Q2 Q1 Q2 Q1 Q2 Q1 Q2 Q1 & Q2 Q1 & Q2 Min. 50 -175 35 -200 25 -160 15 -190 15 15 Max. 175 -50 200 -35 160 -25 190 -15 100 110 Units G G G G G G G G G G
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1989, 1995 Allegro MicroSystems, Inc.
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
SWITCH POINTS vs. TEMPERATURE
150
TRANSFER CHARACTERISTICS
100
BOPS BRPS
SWITCH POINT IN GAUSS
25 V MAX
V OUT(OFF) B OP2 B OP1
50
0
-50
BRPN BOPN
-100
BRP2 BRP1 VOUT(SAT)
OUTPUT VOLTAGE
0
-150 -50
-25
0
25
50
75
100
125
150
-B
0
+B
AMBIENT TEMPERATURE IN C
Dwg. GH-027-1
MAGNETIC FLUX
Dwg. GH-043A
APPLICATIONS
Figure 1 illustrates a method of sensing the presence of either a north or south magnetic pole. Because the UGN3235K is an open-collector device, it is possible to directly connect (wired OR) the two outputs. This causes the output to go LOW when either a north pole or south pole of sufficient magnitude is sensed. The device connected in this manner suits many applications, ranging from doubling the resolution of a ring-magnet encoder, to zero-crossing detection.
VCC 4.5 V to 24 V
+B (SOUTH) B OP1
MAGNETIC FLUX
BRP1
0
B OP2 -B (NORTH)
B RP2
Q1
OUTPUTS
ON Q2 OFF
X
VCC
20 mA
DEAD TIME
OFF
DEAD TIME
ON
1
ON
OFF
2
Dwg. WH-009-1
SIGNAL OUTPUT
3
4
FIGURE 2 ZERO-CROSSING DETECTION
Dwg. EH-010
FIGURE 1 BIPOLAR DETECTOR
Figure 2 shows that there is a "dead time" approximately centered around 0 G. Thus, by sensing the HIGH portion of the UGN3235K wired-OR output, the zerocrossing can be detected.
Figure 3 shows that the UGN3235K makes it possible to implement a very efficient brushless dc motor control using a minimum number of components. Referring again to Figure 1, the dead time (where both drivers are OFF) allows the motor coil field to decay sufficiently. This avoids both excessive reactive voltages and the magnetic drag resulting from the motor coils working in opposition to each other.
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
0.1 F
VCC 1 k
VCC 5 V to 24 V
X
1 k
1
2N4356
2
4
2N4356
3
Dwg. EH-009
FIGURE 3 MOTOR DRIVER
SENSOR LOCATION
(0.005" [0.13mm] die placement)
ACTIVE AREA DEPTH 0.015" 0.38 mm NOM
280
GUIDE TO INSTALLATION
0.106" 2.70 mm
TEMPERATURE IN C
260
0.058" 1.47 mm
240
220
A
BRANDED SURFACE 1 2 3 4
200
Dwg. MH-001-1B
0
5
10
15
20
Dwg. GA-001
TIME IN SECONDS
All Hall effect integrated circuits are susceptible to mechanical stress effects. Caution should be exercised to minimize the application of stress to the leads or the epoxy package. Use of epoxy glue is recommended. Other types may deform the epoxy package. To prevent permanent damage to the Hall cell, heat-sink the leads during hand soldering. Recommended maximum conditions for wave soldering are shown in the graph above.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
Dimensions in Inches (controlling dimensions)
0.208 0.203
Dimensions in Millimeters (for reference only)
5.28 5.16
45
0.063 0.059
45
1.60 1.50
0.138 0.133 45 0.085
MAX
3.51 3.38 45 2.16
MAX
1
2
3
4
0.033
1
2
3
4
0.84
0.600 0.560
0.015
15.24 14.23
0.38
SEE NOTE
SEE NOTE
0.016
0.050
BSC
Dwg. MH-009C in
0.41
1.27
BSC
Dwg. MH-009C 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.
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 design of its products. Components made under military approvals will be in accordance with the approval requirements. 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 which may result from its use.
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3235 DUAL-OUTPUT HALL-EFFECT SWITCH
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3235 DUAL-OUTPUT HALL-EFFECT SWITCH
HALL-EFFECT SENSORS SELECTION GUIDE
Partial Part Number 3046 3054 3056 3058 3059 3060 3121 3122 3123 3132 3133 3134 3141 3142 3143 3144 3161 3175 3177 3185 3187 3188 3189 3195 3197 3235 3275 3421 3422 3503 3515 3516 3517 3518 3625 3626 5140 Avail. Oper. Temp. E/L K/S E/L E/L K/S K/S E/L E/L E/L K/L/S K/L/S E/L E/L E/L E/L E/L E S S E/L E/L E/L E/L E/L L S S E/L E/L S E/L E/L L/S L/S S S E Operate Limits Over Temp. BOP max BRP min Bhys min +200 -200 +300 +5 +225 -225 +300 -300 +100 -100 +35 -35 +500 +80 +430 +120 +470 +160 +95 -95 +75 -75 +50 -40 +175 +10 +245 +60 +355 +150 +450 +25 +160 +30 +180 -180 +150 -150 +300 -300 +175 -175 +200 -200 +250 -250 +200 -200 +200 -200 +200 +15 -200 -15 +250 -250 +300 -300 +85 -85 Typ. 1.3 mV/G Typ. 5.0 mV/G Typ. 2.5 mV/G Typ. 5.0 mV/G Typ. 2.5 mV/G +150 -150 +150 -150 +240 +25 15 5.0 15 150 20 10 60 70 70 30 30 10 20 30 30 20 5.0 80 50 280 100 160 100 110 110 15 15 100 240 10 - - - - - 200* 200* 20 Function Notes Gear-Tooth Sensor Unipolar Multiplex 1 Gear-Tooth Sensor Gear-Tooth Sensor AC Gear-Tooth Sensor AC Gear-Tooth Sensor Unipolar Switch Unipolar Switch Unipolar Switch Bipolar Switch Bipolar Switch Bipolar Switch Unipolar Switch Unipolar Switch Unipolar Switch Unipolar Switch 2-Wire Unipolar Switch Bipolar Latch Bipolar Latch Bipolar Latch Bipolar Latch Bipolar Latch Bipolar Latch Bipolar Latch 2, 3 Bipolar Latch 3 Unipolar Switch 4 Unipolar Switch Bipolar Latch 5 Direction Detection Direction Detection Linear Sensor Chopper-Stabilized Linear Sensor Chopper-Stabilized Linear Sensor Chopper-Stabilized Linear Sensor Chopper-Stabilized Linear Sensor 900 mA Bipolar Latch 3, 5, 6 400 mA Bipolar Latch 3, 5, 6 300 mA Unipolar Switch 3, 6
Operating Temperature Ranges: C = 0C to +70C, S = -20C to +85C, E = -40C to +85C, K = -40C to +125C, L = -40C to +150C Notes 1. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition. 2. Active pull down. 3. Protected. 4. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc motor control. 5. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control. 6. Power driver output. * Typical. Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal for reliable operation over operating temperature range.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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