|HALL-EFFECT GEAR-TOOTH SENSORS -AC COUPLED
Gesamt 8 Seiten
3059 AND 3060
HALL-EFFECT GEAR-TOOTH SENSORS
12 34 5
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ............................. 24 V
Reverse Battery Voltage, VRCC .......... -30 V
Magnetic Flux Density, B ............ Unlimited
Output OFF Voltage, VOUT .................... 24 V
Output Current, IOUT ......................... 25 mA
Package Power Dissipation,
PD ............................................ 500 mW
Operating Temperature Range, TA
Prefix ‘UGN’ ................. -20°C to +85°C
Prefix ‘UGS’ ............... -40°C to +125°C
Storage Temperature Range,
TS ............................... -65°C to +150°C
The UGN/UGS3059KA and UGN/UGS3060KA ac-coupled Hall-
effect 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 electromag-
netic 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 regu-
lator, two quadratic Hall-effect sensing elements, temperature com-
pensating 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.
The two devices provide a choice of operating temperature
ranges. Both devices are packaged in a 5-pin plastic SIP.
s Senses Motion of Ferrous
s Large Effective Air Gap
Targets Such as Gears
s 4.5 V to 24 V Operation
s Wide Operating Temperature Range s Output Compatible With
s Operation to 30 kHz
All Logic Families
s Resistant to RFI, EMI
s Reverse Battery Protection
s Resistant to Physical Stress
Always order by complete part number, e.g., UGS3060KA .
3059 AND 3060
Low-Frequency Operation. Low-frequency opera-
tion 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
CAPACITANCE IN µF
Capacitor Characteristics. The major requirement
for the external capacitor is its ability to operate in a
bipolar (non-polarized) mode. Another important require-
ment is the low leakage current of the capacitor (equiva-
lent 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
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 de-
pends 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 mate-
rial 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 sys-
tems 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 configu-
ration, and the target.
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 BOP
of 15 G and a BRP of -15 G is used, the maximum allow-
able 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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
|Gesamt 8 Seiten
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