Datasheet UGN3235K Datasheet (Allegro)

3235

DUAL-OUTPUT
HALL-EFFECT SWITCH

X

V

CC

1

SUPPLY

Pinning is shown viewed from branded side.

32

1

OUTPUT

4

2

OUTPUT

Dwg. PH-007

GROUND

Data Sheet

27633A*

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.

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

A

Power Supply, VCC. . . . . . . . . . . . . . . . 25 V

Reverse Battery Voltage, V

Magnetic Flux Density, B . . . . . . Unlimited

Output OFF Voltage, V
Output ON Current, I
Operating Temperature Range,

TA. . . . . . . . . . . . . . . . -20°C to + 85°C

Storage Temperature Range

TS. . . . . . . . . . . . . . . . -65°C to +150°C

OUT

OUT

. . . . . -30 V

RCC

. . . . . . . . . . 25 V

. . . . . . . . . . 50 mA

The UGN3235K is supplied in a four-pin plastic single in-line
package (SIP).

FEATURES

■ Reliable and Rugged Magnetic Sensing Switch

■ Two Outputs Independently Switched by North and South Poles

■ Independent Actuation of Outputs Minimizes Inductive-Load

Reactive Transient

■ Built-in Hysteresis Minimizes Interference from Stray Fields

■ Operates from 4.5 V to 24 V

■ Outputs Compatible with All Logic Levels

■ On-Board Reverse Polarity Protection

■ Open-Collector, Active-Low Outputs

Always order by complete part number: UGN3235K .

3235

3

1

2

4

DUAL-OUTPUT
HALL-EFFECT SWITCH

V

CC

REG.

FUNCTIONAL BLOCK DIAGRAM

OUTPUT

1

X

ELECTRICAL CHARACTERISTICS at T

= +25°C (unless otherwise noted).

A

OUTPUT

GROUND

Dwg. FH-003A

2

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V
Output Saturation Voltage V

OUT(SAT)

Output Leakage Current I
Supply Current I
Output Rise Time t
Output Fall Time t

CC

OFF

CC

VCC = 24 V, I
V

= 24 V, VCC = 24 V — — 1.0 µA

OUT

= 20 mA — 160 400 mV

OUT

VCC = 24 V, Output Open — 6.0 8.0 mA

r

f

VCC = 14 V, RL = 820 Ω, CL = 20 pF — 0.04 0.4 µs
VCC = 14 V, RL = 820 Ω, CL = 20 pF — 0.18 0.4 µs

4.5 — 24 V

MAGNETIC CHARACTERISTICS at VCC = 4.5 V to 24 V

Characteristic Test Conditions Output Min. Max. Units

Operate Point, B

OP

TA = +25°C Q1 50 175 G

Q2 -175 -50 G

T

= -20°C to +85°C Q1 35 200 G

A

Q2 -200 -35 G

Release Point, B

RP

TA = +25°C Q1 25 160 G

Q2 -160 -25 G

T

= -20°C to +85°C Q1 15 190 G

A

Q2 -190 -15 G

Hysteresis, B

hys

TA = +25°C Q1 & Q2 15 100 G

= -20°C to +85°C Q1 & Q2 15 110 G

T

A

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

W
Copyright © 1989, 1995 Allegro MicroSystems, Inc.

3235

OUTPUT VOLTAGE

DUAL-OUTPUT
HALL-EFFECT SWITCH

SWITCH POINTS vs. TEMPERATURE

150

B

100

50

0

-50

SWITCH POINT IN GAUSS

-100

-150

-25 25 75 125

-50

0 50 100

AMBIENT TEMPERATURE IN °C

OPS

B

RPS

B

RPN

B

OPN

150

Dwg. GH-027-1

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.

V

CC

4.5 V to 24 V

CC

X

V

143

2

20 mA

SIGNAL
OUTPUT

TRANSFER CHARACTERISTICS

V

OUT(OFF)

25 V
MAX

0

-B

+B (SOUTH)

B

OP1

0

MAGNETIC FLUX

–B (NORTH)

Q1

Q2

OUTPUTS

B

OP2

B

RP2

0

MAGNETIC FLUX

B

RP1

B

RP2

OFF

ON

ON

OFF

B

OP2

DEAD

TIME

FIGURE 2

ZERO-CROSSING DETECTION

B

OP1

B

RP1

V

OUT(SAT)

+B

Dwg. GH-043A

DEAD

TIME

ON

OFF

Dwg. WH-009-1

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.

Dwg. EH-010

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

A

DUAL-OUTPUT
HALL-EFFECT SWITCH

0.1 µF 5 V to 24 V

X

V

CC

CC

V

1

2

1 kΩ

1 kΩ

2N4356

SENSOR LOCATION

(±0.005” [0.13mm] die placement)

ACTIVE AREA DEPTH

0.015"

0.38 mm
NOM

0.106"

2.70 mm

0.058"

1.47 mm

3

4

FIGURE 3

MOTOR DRIVER

280

260

240

220

TEMPERATURE IN °C

2N4356

Dwg. EH-009

GUIDE TO INSTALLATION

200

BRANDED
SURFACE

1 432

Dwg. MH-001-1B

0

515

TIME IN SECONDS

10 20

Dwg. GA-001

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 [phone]

3235

DUAL-OUTPUT
HALL-EFFECT SWITCH

Dimensions in Inches

(controlling dimensions)

0.208

0.203

45°

0.138

0.133

0.085

1234

MAX

0.600

0.560

0.063

0.059

0.033

0.015

45°

Dimensions in Millimeters

(for reference only)

5.28

5.16

45°

3.51

3.38

2.16

1234

MAX

15.24

14.23

1.60

1.50

45°

0.84

0.38

SEE NOTE

0.016

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.

0.050

BSC

Dwg. MH-009C in

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.

SEE NOTE

0.41

1.27

BSC

Dwg. MH-009C mm

3235

DUAL-OUTPUT
HALL-EFFECT SWITCH

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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

3235

DUAL-OUTPUT
HALL-EFFECT SWITCH

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3235

DUAL-OUTPUT
HALL-EFFECT SWITCH

HALL-EFFECT SENSORS SELECTION GUIDE

Partial Part Avail. Oper. ␣ Operate Limits Over Temp.␣
Number Temp. B

3046 E/L [phone] Gear-Tooth Sensor
3054 K/S +300 +5 5.0 Unipolar Multiplex 1
3056 E/L [phone] Gear-Tooth Sensor
3058 E/L [phone] Gear-Tooth Sensor
3059 K/S [phone] AC Gear-Tooth Sensor
3060 K/S +35 -35 10 AC Gear-Tooth Sensor
3121 E/L +500 +80 60 Unipolar Switch
3122 E/L +430 +120 70 Unipolar Switch
3123 E/L +470 +160 70 Unipolar Switch
3132 K/L/S +95 -95 30 Bipolar Switch
3133 K/L/S +75 -75 30 Bipolar Switch
3134 E/L +50 -40 10 Bipolar Switch
3141 E/L +175 +10 20 Unipolar Switch
3142 E/L +245 +60 30 Unipolar Switch
3143 E/L +355 +150 30 Unipolar Switch
3144 E/L +450 +25 20 Unipolar Switch
3161 E +160 +30 5.0 2-Wire Unipolar Switch
3175 S [phone] Bipolar Latch
3177 S [phone] Bipolar Latch
3185 E/L [phone] Bipolar Latch
3187 E/L [phone] Bipolar Latch
3188 E/L [phone] Bipolar Latch
3189 E/L [phone] Bipolar Latch
3195 E/L [phone] Bipolar Latch 2, 3
3197 L [phone] Bipolar Latch 3
3235 S +200 +15 15 Unipolar Switch 4

3275 S [phone] Bipolar Latch 5
3421 E/L [phone] Direction Detection
3422 E/L +85 -85 10 Direction Detection
3503 S Typ. 1.3 mV/G – Linear Sensor
3515 E/L Typ. 5.0 mV/G – Chopper-Stabilized Linear Sensor
3516 E/L Typ. 2.5 mV/G – Chopper-Stabilized Linear Sensor
3517 L/S Typ. 5.0 mV/G – Chopper-Stabilized Linear Sensor
3518 L/S Typ. 2.5 mV/G – Chopper-Stabilized Linear Sensor
3625 S [phone]* 900 mA Bipolar Latch 3, 5, 6
3626 S [phone]* 400 mA Bipolar Latch 3, 5, 6
5140 E +240 +25 20 300 mA Unipolar Switch 3, 6

Operating Temperature Ranges:

C = 0°C to +70°C, S = -20°C to +85°C, E = -40°C to +85°C, K = -40°C to +125°C, L = -40°C to +150°C

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.

max B

OP

-200 -15 15 Unipolar Switch

RP

min B

min Function† Notes

hys

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]