Honeywell | VG481V1 Back Biased Hall Sensor Integrated Circuit | Datasheet | Honeywell VG481V1 Back Biased Hall Sensor Integrated Circuit Datasheet

Honeywell VG481V1 Back Biased Hall Sensor Integrated Circuit Datasheet
VG481V1
Back Biased Hall-effect Speed Sensor Integrated Circuit (IC)
DESCRIPTION
VALUE TO CUSTOMERS
The VG481V1 contains a dual peak
• Uses a dual peak detecting circuit
detecting circuit that is coupled with a
derived from the stored peak and
Hall-effect element to detect the speed
valley values. This provides zero speed
of a ferrous gear tooth target wheel. A
capability and more accurately tracks
biasing magnet provides a changing
targets that exhibit run-out and other
magnetic field as the target wheel
variations.
moves past the senor IC. The sensor IC
functions in reference to peak and slot
magnetic levels. The sensor IC output is
in either a high state or a low state, which
• AEC-Q100 qualified and often suitable
for automotive applications.
• Provides higher accuracy.
corresponds to the target tooth/slot
POTENTIAL APPLICATIONS
FEATURES
features. The VG481V1 IC consists of a
• Transportation: Transmission speed
• Back-biased speed sensor IC
voltage regulator, clock/oscillator, Hallelement, amplifier, internal peak/valley
sensing
• General speed sensing
• Zero-speed capable
• Low cost and easy to use
track and hold circuits, comparator, and
• 4 V to 24 V supply voltage range
open collector output stage. The sensor
• -40°C to 150°C operating temperature
IC is protected from abnormal operation
range
at low voltage by a power-on rest circuit.
• Open collector output rated for 20 mA
The output circuitry contains short
• Output short circuit protection
circuit protection. The voltage regulator
• Reverse voltage protected
contains reverse connection protection.
• Qualified to AEC-Q100 (Grade 0)
The slicing level is derived from the
stored peak and valley values. A start-up
algorithm holds the output state until
PORTFOLIO
the slicing level has reached a stable
The Honeywell VG481V1
position. The VG481V1 is zero speed
Speed Sensor IC joins the following
capable after initial startup as long as
related products: VM721V1, VM721D1,
power is applied. The VG481V1 IC is
VF401, VF526DT. To view the entire
offered in flat TO-92-style package with
product portfolio, click here.
straight leads in bulk packaging which
allows for a compact PC board layout.
DIFFERENTIATION
Provides lesser operate point variation.
BACK-BIASED HALL-EFFECT SPEED SENSOR INTEGRATED CIRCUIT ICS
VG481V1
TABLE 1. ELECTRICAL SPECIFICATIONS (AT 4.0 V ≤ VS ≤ 24 V, -40°C ≤ TA ≤ 150°C, UNLESS OTHERWISE SPECIFIED)
CHARACTERISTIC
CONDITION
MIN.
TYP.
MAX.
UNIT
Supply voltage
Pin 2 referenced to Pin 1
4
14
24
V
Reverse supply voltage
current < 10 mA
—
—
-26
V
Supply current
Vsupply = 24 V, with “ON” state
—
—
10
mA
Startup time
Vsupply = 4 V
—
—
10
ms
Output short circuit
short load
—
10
—
µs
Output leakage current
Vsupply = 24 V, with “OFF” state
—
—
10
µA
Output current (sinking)
continuous operation (recommended)
—
—
5
mA
Output saturation voltage
sinking 20 mA
—
—
360
mV
Switching frequency:
rise time
fall time
VCC = 12 V, R L=2 kOhm; C L = 20 pF
VCC = 12 V, R L=2 kOhm; C L = 20 pF
—
—
—
—
10
1
µs
µs
1
ms
Power up ramp time1
0 V to 4 V, power up in high state
1
If the power up ramp time from 0 V to 4 V is greater than 1 ms, proper IC functionality cannot be guaranteed.
TABLE 2. MAGNETIC SPECIFICATIONS
CHARACTERISTIC
CONDITION
MIN.
TYP.
MAX.
UNIT
Back bias range
South pole facing back of package
500
—
4000
Gauss
Peak magnetic field
for linear operation
—
—
4500
Gauss
Switching differential
25°C
—
5
—
Gauss
Minimum signal lockout
peak to valley difference
—
38.5
—
Gauss
Magnetic signal
continuous operation (recommended)
75
—
—
Gauss
Output signal frequency
—
0
27.5
10000
Hz
Die placement tolerance
X and Y
-0.07
—
0.07
mm
MIN.
TYP.
MAX.
UNIT
8
—
—
kV
MIN.
TYP.
MAX.
UNIT
TABLE 3. ENVIRONMENTAL SPECIFICATIONS
CHARACTERISTIC
CONDITION
ESD (HBM)
JEDEC JS-001
TABLE 4. ABSOLUTE MAXIMUM RATINGS
CHARACTERISTIC
CONDITION
Operating temperature
ambient
-40
—
150
°C
Storage temperature
ambient, unbiased
-55
—
150
°C
Soldering temperature
applied for <10 s
—
—
265
°C
Output current (sinking)
open collector
—
—
20
mA
Forward supply voltage
dc voltage for 1 hour
—
—
26
V
Reverse supply voltage
dc voltage for 1 hour
-26
—
—
V
NOTICE
Absolute maximum ratings are the extreme limits the device will momentarily withstand
without damage to the device. Electrical and mechanical characteristics are not guaranteed
if the rated voltage and/or currents are exceeded, nor will the device necessarily operate at
absolute maximum ratings.
2
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CAUTION
ELECTROSTATIC
SENSITIVE
DEVICES
DO NOT OPEN OR HANDLE
EXCEPT AT A
STATIC FREE WORKSTATION
ESD SENSITIVITY:
CLASS 3
BACK-BIASED HALL-EFFECT SPEED SENSOR INTEGRATED CIRCUIT ICS
VG481V1
TYPICAL OPERATION
Figure 1 shows the circuit’s high
level block diagram. During normal
operation, peak maximum and valley
minimum values, proportional to the
magnetic signal, are tracked and held.
The average of these two values is
used to produce a slicing level that
is compared to the input signal to
produce the output transitions.
Upon transition from output low to
high state, the valley minimum value
is preloaded in the positive direction,
an amount equal to the difference of
the previous peak and valley divided
by four. Likewise, upon transition from
output high to low state, the peak
maximum is preloaded in the negative
direction in an amount equal to the
difference of the previous peak and
valley divided by four (see Figure 2).
The preload values are calculated from
the peak and valley counter register
values. This preload function allows the
sensor to track targets with run-out and
other variations.
FIGURE 1. HIGH LEVEL CIRCUIT BLOCK DIAGRAM
Voltage
regulator
Clock
Control logic
Power on reset
Minimum signal lockout
peak/valley reset/preload
Dual
Hall-effect
elements
Comparator
Amplifier
Internal
peak
track and
hold
Output
control
Short
circuit
protected
output
Internal
valley
track and
hold
FIGURE 2. HIGH LEVEL OPERATION
Input (Gauss)
2800
Magnetic signal
2600
2400
2200
Time
Internal (mV)
1.6
Amplifier output
1.5
Peak
1.4
Valley
Slice
1.3
Logic Level Output (mV)
Time
Output
1
0.5
0
Time
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3
BACK-BIASED HALL-EFFECT SPEED SENSOR INTEGRATED CIRCUIT ICS
VG481V1
INTERNAL TRACK AND HOLD
Whenever the input is higher than
The internal valley track and hold circuit
OPERATION (See Figures 3, 4)
the peak hold value, the comparator
works identically, except in the opposite
The input voltage is constantly
triggers the counter to increment.
direction. The peak hold and valley hold
compared to the voltage held at
This continues until the input value no
outputs are averaged to produce the
the output of the peak hold circuit.
longer exceeds the peak hold value.
slicing level.
FIGURE 3. INTERNAL PEAK TRACK AND HOLD BLOCK DIAGRAM
In
Comparator
Peak
hold
circuit
Up
counter
Out
FIGURE 4. INTERNAL PEAK SAMPLE AND HOLD OPERATION
Peak hold output/
comparator inInput voltage/
comparator in+
Time
Comparator output/
counter clock
Time
Counter output/
peak hold input
Time
4
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BACK-BIASED HALL-EFFECT SPEED SENSOR INTEGRATED CIRCUIT ICS
VG481V1
POWER ON RESET
MINIMUM SIGNAL LOCKOUT
STARTUP SEQUENCE
At power up, and any time the supply
Sensor IC output is enabled when the
Sensor IC startup consists of three
voltage drops below a level that allows
peak-to-valley difference is greater than
stages:
reliable operation, the sensor IC ceases
38.5 Gauss typical. When the peak-to-
1. Power on reset circuit release: This
operation and will not provide an output
valley difference degrades to less than
occurs once sufficient stable operating
until the supply voltage rises to a proper
27.5 Gauss typical, the sensor IC output
voltage is applied.
level. The output will be high until the
is disabled.
2. Internal peak and valley track and hold
circuits begin to fully track the input
power on reset releases, and it will
signal: This is typically less than 1 ms.
remain high until the first valid high-to-
3. Minimum signal lockout release:
low transition.
This occurs when the peak-to-valley
FIGURE 5. MINIMUM CIRCUIT FOR OPERATION
difference is greater than 38.5 Gauss.
Second level sensor
Controller interface
Vsupply
V+
sensor IC output will switch normally.
Rpullup
Cbypass
220 nF min.
IC
Output
After the three startup stages, the
FIGURE 7. PACKAGE DIMENSIONS
(FOR REFERENCE ONLY: MM/[IN])
Vout
4,06
1,57
Ground
0,76
2,50
0,46
Sensor IC
3,00
FIGURE 6. TYPICAL OUTPUT SIGNAL RELATIVE TO MECHANICAL TARGET
1,52
3X 0,56 Max.
Mechanical
target
15,5 - 14,4
Magnetic
signal
Sensor
output
3X 0,38
3X 0,38
2X 1,27
Note: Ensure the minimum hole
size in the PCB is 0,68 mm [0.027]
dia. based on the IPC 2222 Level B
standard.
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5
BACK-BIASED HALL-EFFECT SPEED SENSOR INTEGRATED CIRCUIT ICS
VG481V1
SENSOR IC MOUNTING
The recommended sensor IC mounting
position is in front of a gear wheel (see
Figure 8). The south pole of the back
bias magnet must face the back of the
FIGURE 8. SENSOR IC MOUNTING
Gear wheel
(ferrous)
Observe the following precautions
when using magnetometers in
Gear slot
general:
Gear tooth
sensor IC package. The sensing distance
Sensor IC
face
is measured between the sensor IC
front and the tip of the gear tooth. The
sensor IC senses ferrous targets. The
sensor IC contains a single Hall element
NOTICE
S
Back bias
magnet
N
• The presence of ferrous materials,
such as nickel iron, steel and
cobalt near the sensor will create
disturbances in the earth’s magnetic
field that will distort x, y, z axis
measurements. Non-ferrous materials
and a symmetrical magnet such that
such as copper brass, gold, aluminum,
the sensor IC can be rotated on its axis
some stainless steel, silver, tin silicon,
with no performance degradation. The
and any nonmetallic material will not
input voltage is constantly compared
distort the field measurements.
to the voltage held at the output of the
• The presence of the earth’s magnetic
peak hold circuit. Whenever the input
filed must be taken into account
is higher than the peak hold value, the
when measuring the x, y, z fields and it
comparator triggers the counter to
varies considerably in different parts
increment. This continues until the input
of the world. Differences in the earth’s
value no longer exceeds the peak hold
magnetic filed are quite dramatic
value.
between North America, South
America, and the equator.
• Typical targets are the 120 mm to
300 mm in diameter. The tooth shapes
vary (square, triangular, windows).
The teeth are of similar size, equally
spaced, and with no signature
features. The sensing distance
depends on the tooth/slot spacing
and frequency due to eddy current
effects.
TABLE 5. ORDER GUIDE
Catalog Listing
VG481V1
6
Description
Back-biased Hall-effect speed sensor, flat TO-92-style package, straight standard
leads, bulk packaging (1000 units/bag)
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ADDITIONAL MATERIALS
WARRANTY/REMEDY
The following associated literature is
available at sensing.honeywell.com:
Honeywell warrants goods of its
manufacture as being free of defective
materials and faulty workmanship
during the applicable warranty period.
Honeywell’s standard product warranty
applies unless agreed to otherwise by
Honeywell in writing; please refer to
your order acknowledgment or consult
your local sales office for specific
warranty details. If warranted goods
are returned to Honeywell during the
period of coverage, Honeywell will
repair or replace, at its option, without
charge those items that Honeywell,
in its sole discretion, finds defective.
The foregoing is buyer’s sole remedy
and is in lieu of all other warranties,
expressed or implied, including those
of merchantability and fitness for a
particular purpose. In no event shall
Honeywell be liable for consequential,
special, or indirect damages.
• Product range guide
• Magnetic Sensor IC Line Card
• Magnetic Sensor IC Selection Chart
• Product Installation instructions
While Honeywell may provide
application assistance personally,
through our literature and the
Honeywell web site, it is buyer’s
sole responsibility to determine
the suitability of the product in the
application.
FOR MORE INFORMATION
Specifications may change without
notice. The information we supply is
believed to be accurate and reliable
as of this writing. However, Honeywell
assumes no responsibility for its use.
Honeywell Sensing and Internet of
Things services its customers through a
worldwide network of sales offices and
distributors. For application assistance,
current specifications, pricing or the
nearest Authorized Distributor, visit
sensing.honeywell.com or call:
Asia Pacific
+65 6355-2828
Europe +44 1698 481481
USA/Canada
+1-800-537-6945
Honeywell Sensing and Internet of
Things
9680 Old Bailes Road
Fort Mill, SC 29707
www. honeywell.com
005992-2-EN | 2 | 06/19
© 2019 Honeywell International Inc. All rights reserved.
m WARNING
PERSONAL INJURY
DO NOT USE these products as safety
or emergency stop devices or in any
other application where failure of the
product could result in personal injury.
Failure to comply with these
instructions could result in death or
serious injury.
m WARNING
MISUSE OF
DOCUMENTATION
•
•
The information presented in this
product sheet is for reference
only. Do not use this document as
a product installation guide.
Complete installation, operation,
and maintenance information
is provided in the instructions
supplied with each product.
Failure to comply with these
instructions could result in death or
serious injury.
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