Datasheet 3059, 3060 Datasheet (ALLEGRO)

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3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

X X

V

CC

1 432 5

FILTER

OUTPUT

SUPPLY

Pinning is shown viewed from branded side.

GROUND

FILTER

Dwg. PH-011

3059

AND

3060

HALL-EFFECT GEAR-TOOTH SENSORS

—AC COUPLED

The UGN/UGS3059KA and UGN/UGS3060KA ac-coupled Hall­effect gear-tooth sensors are monolithic integrated circuits that switch
in response to changing differential magnetic fields created by moving
ferrous targets. These devices are ideal for use in non-zero-speed,
gear-tooth-based speed, position, and timing applications such as in
anti-lock braking systems, transmissions, and crankshafts.

Both devices, when coupled with a back-biasing magnet, can be
configured to turn ON or OFF with the leading or trailing edge of a
gear-tooth or slot. Changes in fields on the magnet face caused by a
moving ferrous mass are sensed by two integrated Hall transducers
and are differentially amplified by on-chip electronics. This differential
sensing design provides immunity to radial vibration within the devices’
operating air gaps. Steady-state magnet and system offsets are
eliminated using an on-chip differential band-pass filter. This filter also
provides relative immunity to interference from RF and electromag­netic sources. The on-chip temperature compensation and Schmitt
trigger circuitry minimizes shifts in effective working air gaps and
switch points over temperature, allowing operation to low frequencies
over a wide range of air gaps and temperatures.

Each Hall-effect digital Integrated circuit includes a voltage regu­lator, two quadratic Hall-effect sensing elements, temperature com­pensating circuitry, a low-level amplifier, band-pass filter, Schmitt
trigger, and an open-collector output driver. The on-board regulator
permits operation with supply voltages of 4.5 to 24 volts. The output
stage can easily switch 20 mA over the full frequency response range
of the sensor and is compatible with bipolar and MOS logic circuits.

Data Sheet

27612.20*

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

A

Supply Voltage, VCC............................. 24 V

Reverse Battery Voltage, V

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

Output OFF Voltage, V
Output Current, I
Package Power Dissipation,

P

............................................ 500 mW

D

Operating Temperature Range, T

Prefix ‘UGN’................. -20°C to +85°C

Prefix ‘UGS’ ............... -40

Storage Temperature Range,

T

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

S

OUT

......................... 25 mA

OUT

.......... -30 V

RCC

.................... 24 V

A

°C to +125°C

The two devices provide a choice of operating temperature
ranges. Both devices are packaged in a 5-pin plastic SIP.

FEATURES

■ Senses Motion of Ferrous
Targets Such as Gears

■ Wide Operating Temperature Range

■ Operation to 30 kHz

■ Resistant to RFI, EMI

Always order by complete part number, e.g., UGS3060KA .

■ Large Effective Air Gap

■ 4.5 V to 24 V Operation

■ Output Compatible With

All Logic Families

■ Reverse Battery Protection

■ Resistant to Physical Stress

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

1

SUPPLY

FUNCTIONAL BLOCK DIAGRAM

REG

OUTPUT

2

+

-

3

X X

4

FILTER

5

FILTER

GROUND

Dwg. FH-008

ELECTRICAL CHARACTERISTICS over operating temperature range.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V
Output Saturation Voltage V
Output Leakage Current I
Supply Current I
High-Frequency Cutoff f
Output Rise time t
Output Fall time t

OUT(SAT)

CC

OFF

CC

coh

r

f

Operating 4.5 — 24 V
I

= 20 mA, B > B

OUT

V

= 24 V, B < B

OUT

VCC = 18 V, B < B

-3 dB 30 — — kHz
V

= 12 V, RL = 820 Ω — 0.04 0.2 µs

OUT

V

= 12 V, RL = 820 Ω — 0.18 0.3 µs

OUT

OP

RP

RP

— 130 400 mV
——10µA
—1120mA

MAGNETIC CHARACTERISTICS over operating temperature and supply voltage ranges

Part Numbers*

3059 3060

Characteristic Test Conditions Min. Typ. Max. Min. Typ. Max. Units

Operate Point, B
Release Point, B
Hysteresis, B

NOTES: * Complete part number includes a prefix to identify operating temperature range (UGN or UGS) and the package suffix KA.

Magnetic switch points are specified as the difference in magnetic fields at the two Hall elements.
As used here, negative flux densities are defined as less than zero (algebraic convention).
Typical values are at TA = 25°C and VCC = 12 V.

OP
RP

hys

Output switches OFF to ON 10 65 100 5.0 15 35 G
Output switches ON to OFF -100 -65 -10 -35 -15 -5.0 G
BOP - B

RP

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

— 130 — — 30 — G

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

TYPICAL OPERATING CHARACTERISTICS

SWITCH POINTS

100

50

0

-50

DIFFERENTIAL FLUX DENSITY IN GAUSS

-100

-50

-25 25 75 125

0 50 100

AMBIENT TEMPERATURE IN °C

3059
OPERATE POINT
3060

3060
RELEASE POINT
3059

OUTPUT SATURATION VOLTAGE

V = 8 V

CC

Dwg. GH-056

150

20

10

0

-10

DIFFERENTIAL FLUX DENSITY IN GAUSS

-20
0

UGN/UGS3060KA

I = 20 mA

OUT

T = +25°C

A

510152025

SUPPLY VOLTAGE IN VOLTS

OPERATE POINT

RELEASE POINT

Dwg. GH-057

300

I = 20 mA

OUT

V = 12 V

CC

200

100

SATURATION VOLTAGE IN mV

0

-50

0 25 50 75 100

AMBIENT TEMPERATURE IN °C

150-25 125

Dwg. GH-029-1

200

I = 20 mA

OUT

T = +25°C

A

150

100

SATURATION VOLTAGE IN mV

50

0

510152025

SUPPLY VOLTAGE IN VOLTS

Dwg. GH-055

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

TYPICAL OPERATING CHARACTERISTICS

SUPPLY CURRENT

20

15

10

SUPPLY CURRENT IN mA

5

0

-50

0 255075100

AMBIENT TEMPERATURE IN °C

B ≤ B

13

T = +25°C

A

V = 18 V

CC

RP

125-25

150

Dwg. GH-028-1

12

11

10

SUPPLY CURRENT IN mA

9

8

0

510152025

SUPPLY VOLTAGE IN VOLTS

B < B

RP

Dwg. GH-031-1

APPLICATIONS INFORMATION

A gear-tooth sensing system consists of the sensor
IC, a back-biasing magnet, and a target. The system
requirements are usually specified in terms of the effective
working air gap between the package and the target (gear
teeth), the number of switching events per rotation of the
target, temperature and speed ranges, minimum pulse
duration or duty cycle, and switch point accuracy. Careful
choice of the sensor IC, magnet material and shape,
target material and shape, and assembly techniques
enables large working air gaps and high switch-point
accuracy over the system operating temperature range.

Naming Conventions. With a south pole in front of
the branded surface of the sensor or a north pole behind
the sensor, the field at the sensor is defined as positive.

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

As used here, negative flux densities are defined as less
than zero (algebraic convention), e.g., -100 G is less than

-50 G.
Magnet Biasing. In order to sense moving non-

magnetized ferrous targets, these devices must be back­biased by mounting the unbranded side on a small
permanent magnet. Either magnetic pole (north or south)
can be used.

The devices can also be used without a back-biasing

magnet. In this configuration, the sensor can be used to
detect a rotating ring magnet such as those found in
brushless dc motors or in speed sensing applications.
Here, the sensor detects the magnetic field gradient
created by the magnetic poles.

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

Figure 1

TYPICAL TRANSFER

CHARACTERISTIC

24 V
MAX

OUTPUT VOLTAGE IN VOLTS

B

RP

V

OUT(SAT)

0+B

Figure 2

LEADING
EDGE

GEAR

E2 E1

NORTH

SOUTH

B & B

E1 E2

0

-B

DIFFERENTIAL FLUX DENSITY, BE1 – B

4300 G

Sensor Operation. These sensor ICs each contain

two integrated Hall transducers (E1 and E2) that are used
to sense a magnetic field differential across the face of the

B

OP

IC (see Sensor Location drawing). Referring to Figure 1,
the trigger switches the output ON (output LOW) when
B

E1

- B

E2 < BOP

and switches the output OFF (output

HIGH) when BE1 - BE2 < BRP. The difference between B

OP

and BRP is the hysteresis of the device.

Figure 2 relates the output state of a back-biased
sensor IC, with switching characteristics shown in Figure
1, to the target gear profile and position. Assume a north
pole back-bias configuration (equivalent to a south pole at
the face of the device). The motion of the gear produces
a phase-shifted field at E1 and E2 (Figure 2(a)); internal
conditioning circuitry subtracts the fields at the two

E2

Dwg. GH-034

elements (Figure 2(b)); this differential field is band-pass
filtered to remove dc offset components and then fed into
a Schmitt trigger; the Schmitt trigger switches the output
transistor at the thresholds BOP and BRP. As shown
(Figure 2(c)), the IC output is LOW whenever sensor E1

TRAILING
EDGE

sees a (ferrous) gear tooth and sensor E2 faces air. The
output is HIGH when sensor E1 sees air and sensor E2
sees the ferrous target.

DIRECTION
OF ROTATION

AC-Coupled Operation. Steady-state magnet and
system offsets are eliminated using an on-chip differential
band-pass filter. The lower frequency cut-off of this
patented filter is set using an external capacitor the value
of which can range from 0.01 µF to 10 µF. The high­frequency cut-off of this filter is set at 30 kHz by an

(a)

internal integrated capacitor.

B – B

E1 E2

The differential structure of this filter enables the IC to

4130 G

150 G

B

OP

0 G

B

RP

-150 G

V

OUT

V

OUT(SAT)

OUTPUT DUTY CYCLE ≈ 50%

(b)

(c)

Dwg. WH-003-1

reject single-ended noise on the ground or supply line
and, hence, makes it resistant to radio-frequency and
electromagnetic interference typically seen in hostile
remote sensing environments. This filter configuration
also increases system tolerance to capacitor degradation
at high temperatures, allowing the use of an inexpensive
external ceramic capacitor.

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

Low-Frequency Operation. Low-frequency opera­tion of the sensor is set by the value of an external
capacitor. Figure 3 provides the low-frequency cut-off (-3
dB point) of the filter as a function of capacitance value.
This information should be used with care. The graph
assumes a perfect sinusoidal magnetic signal input.
In reality, when used with gear teeth, the teeth create
transitions in the magnetic field that have a much higher
frequency content than the basic rotational speed of the
target. This allows the device to sense speeds much
lower than those indicated by the graph for a given
capacitor value.

Figure 3

1 k

100

10

1.0

LOW-FREQUENCY CUTOFF IN Hz

codes Z5S, Y5S, X5S, or X7S (depending on operating
temperature range) or better are recommended. The
commonly available Z5U temperature code should not be
used in this application.

Magnet Selection. The UGx3059KA or UGx3060KA
can be used with a wide variety of commercially available
permanent magnets. The selection of the magnet de­pends on the operational and environmental requirements
of the sensing system. For systems that require high
accuracy and large working air gaps or
an extended temperature range, the usual magnet mate­rial of choice is rare-earth samarium cobalt (SmCo). This
magnet material has a high energy product and can
operate over an extended temperature range. For sys­tems that require low-cost solutions for an extended
temperature range, AlNiCo 8 can be used. Due to its
relatively low energy product, smaller operational air gaps
can be expected. Neodymium iron boron (NeFeB) can be
used over moderate temperature ranges when large
working air gaps are required. Of these three magnet
materials, AlNiCo 8 is the least expensive by volume and
SmCo is the most expensive.

System Issues. Optimal performance of a gear-tooth
sensing system strongly depends on four factors: the IC
magnetic parameters, the magnet, the pole piece configu­ration, and the target.

0.1

0.01

0.1 1.0 10

CAPACITANCE IN µF

Dwg. GH-025

Capacitor Characteristics. The major requirement
for the external capacitor is its ability to operate in a
bipolar (non-polarized) mode. Another important require­ment is the low leakage current of the capacitor (equiva­lent parallel resistance should be greater than 500kΩ). To
maintain proper operation with frequency, capacitor
values should be held to within ±30% over the operating
temperature range. Available non polarized capacitors
include ceramic, polyester, and some tantalum types. For
low-cost operation, ceramic capacitors with temperature

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

Sensor Specifications. Shown in Figure 4 are
graphs of the differential field as a function of air gap.
A 48-tooth, 2.5” (63.5 mm) diameter, uniform target similar
to that used in ABS applications is used. The samarium
cobalt magnet is 0.32” diameter by 0.20” long
(8.13 x 5.08 mm). The maximum functioning air gap with
this typical gear/magnet combination can be determined
using the graphs and specifications for the sensor IC.

In this case, if a UGx3060KA sensor with a typical B

OP

of 15 G and a BRP of -15 G is used, the maximum allow­able air gap would be approximately 0.120”. If the worst
case switch points of ±35 G for the UGx3060KA are used,
the maximum air gap is approximately 0.105”.

All system issues should be translated back to such a
profile to aid the prediction of system performance.

3059

A

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

Figure 4

DIFFERENTIAL FLUX DENSITY

2000

1500

1000

500

0

-500

-1000

-1500

DIFFERENTIAL FLUX DENSITY IN GAUSS

-2000
0

0.025 0.050 0.100 0.125

AIRGAP FROM PACKAGE FACE IN INCHES

0.075

Dwg. GH-035

Ferrous Targets. The best ferrous targets are made
of cold-rolled low-carbon steel. Sintered-metal targets are
also usable, but care must be taken to ensure uniform
material composition and density.

The teeth or slots of the target should be cut with a
slight angle so as to minimize the abruptness of transition
from metal to air as the target passes by the sensor.
Sharp transitions will result in magnetic overshoots that
can result in false triggering.

Gear teeth larger than 0.10” (2.54 mm) wide and at
least 0.10” (2.54 mm) deep provide reasonable working
air gaps and adequate change in magnetic field for
reliable switching. Generally, larger teeth and slots allow
a larger air gap. A gear tooth width approximating the
spacing between sensors (0.088” or 2.24 mm) requires
special care in the sytem design and assembly tech­niques.

200

150

100

50

0

-50

-100

-150

DIFFERENTIAL FLUX DENSITY IN GAUSS

-200

0.070

0.080 0.090 0.110 0.120

AIRGAP FROM PACKAGE FACE IN INCHES

Figure 5

SENSOR LOCATIONS

(±0.005” [0.13 mm] die placement)

ACTIVE AREA DEPTH

0.014"

0.37 mm
NOM

BRANDED
SURFACE

2.20 mm

E1 E2

12 4 53

0.087"

0.100

0.083"

2.10 mm

Dwg. GH-036

0.075"

1.91 mm

Dwg. MH-007D

3059

AND

3060

HALL-EFFECT
GEAR-TOOTH SENSORS
—AC COUPLED

SEE NOTE

Dimensions in Inches

(controlling dimensions)

0.252

0.247

0.181

0.176

0.083

13452

MAX

0.600

0.560

0.016

0.050

BSC

0.063

0.059

45°

0.018

0.015

Dwg. MH-010G in

SEE NOTE

Dimensions in Millimeters

(for reference only)

6.40

6.27

4.60

4.47

2.11

13452

MAX

15.24

14.23

0.41

1.27

BSC

1.60

1.50

45°

0.46

0.38

Dwg. MH-010G mm

Surface-Mount Lead Form (Suffix -TL)

0.095

±0.005

0.002

MAX

0°–8°

0.004

MAX

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.

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.

0.020

MIN

FLAT

Dwg. MH-015 in

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

2.41

±0.13

0.051

MAX

0°–8°

0.10

MAX

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.