Honeywell VG481V1 Back Biased Hall Sensor Integrated Circuit Installation guide

Honeywell VG481V1 Back Biased Hall Sensor Integrated Circuit Installation guide

Installation Instructions for the

Back-Bias Hall-effect Speed Sensor

:

VG481V1

32346701

Issue A

GENERAL INFORMATION

The VG481V1 contains a dual peak detecting circuit that is coupled with a Hall-effect element to detect the speed of a ferrous gear tooth target wheel. A biasing magnet provides a changing magnetic field as the target wheel 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 corresponds to the target tooth/slot features.

CAUTION

ELECTROSTATIC DISCHARGE DAMAGE

Ensure proper ESD precautions are followed when handling this product.

Failure to comply with these instructions may result in product damage.

CAUTION

ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN OR HANDLE EXCEPT AT A STATIC FREE WORKSTATION ESD SENSITIVITY: CLASS 3

SOLDERING AND ASSEMBLY

CAUTION

IMPROPER SOLDERING

• Ensure leads are adequately supported during any forming/shearing operation so that they are not stressed inside the plastic case.

• Limit exposure to high temperatures.

Failure to comply with these instructions may result in product damage

Wave solder at 250°C to 260°C [482°F to 500°F] for a maximum of three seconds. Burrs are allowed only if full lead length will pass through a 0,68 mm [0.027 in] dia. hole.

CLEANING

CAUTION

IMPROPER CLEANING

Do not use pressure wash. High-pressure stream could force contaminants into the package.

Failure to comply with these instructions may result in product damage.

Use agitated rinse to clean the sensor.

Table 1. Electrical Specifications (At 4.0 V ≤ V S ≤ 24 V, -40°C ≤ T A ≤ 150°C, unless otherwise specified) Characteristic Condition Min.

Typ.

Supply voltage Pin 2 referenced to Pin 1 4 14 Reverse supply voltage Supply current Startup time Output short circuit current < 10 mA V supply = 24 V, with “ON” state V supply = 4 V short load — — — — — — — 10 Output leakage current Output current (sinking) V supply = 24 V, with “OFF” state continuous operation (recommended) — — Output saturation voltage Switching frequency: rise time fall time sinking 20 mA V CC = 12 V, R L =2 kOhm; C L = 20 pF V CC = 12 V, R L =2 kOhm; C L = 20 pF — — — — — — Power up ramp time 1 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.

Max.

24 -26 10 10 — 10 5 360 10 1 1

Unit

V V mA ms µ s µ A mA mV µ s µ s ms

Sensing and Internet of Things

VG481V1

Back-Biased Hall-effect Speed Sensor IC

Issue A

32346701

Table 2. Magnetic Specifications Characteristic Condition

Back bias range South pole facing back of package Peak magnetic field Switching differential for linear operation 25°C Minimum signal lockout Magnetic signal Output signal frequency Die placement tolerance peak to valley difference continuous operation (recommended) — X and Y

Table 3. Environmental Specifications Characteristic Condition

ESD (HBM) JEDEC JS-001

Min.

500 — — — 75 0 -0.07

Min.

8

Typ.

— — 5 38.5

— 27.5

Typ.

Max.

4000 4500 — — — 10000 0.07

Max.

Unit

Gauss Gauss Gauss Gauss Gauss Hz mm

Unit

kV

Table 4. Absolute Maximum Ratings Characteristic Condition

Operating temperature ambient Storage temperature Soldering temperature ambient, unbiased applied for <10 s Output current (sinking) Forward supply voltage Reverse supply voltage open collector dc voltage for 1 hour dc voltage for 1 hour

Min.

-40 [-40] -55 [-67] — — — -26

Typ.

— — — — — —

Max.

150 [302] 150 [302]] 265 [509] 20 26 —

Unit

°C [°F] °C [°F] °C [°F] mA V 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.

Figure 1. Sensor IC Mounting

Gear wheel (ferrous)

SENSOR IC MOUNTING

The recommended sensor IC mounting position is in front of a gear wheel (see Figure 1). The south pole of the back bias magnet must face the back of the sensor IC package. The sensing distance 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 and a symmetrical magnet such that the sensor IC can be rotated on its axis with no performance degradation. The input voltage is constantly compared to the voltage held at the output of the peak hold circuit. Whenever the input is higher than the peak hold value, the comparator triggers the counter to increment. This continues until the input value no longer exceeds the peak hold value.

Gear slot Gear tooth

S N

Sensor IC face Back bias magnet

2

Sensing and Internet of Things

VG481V1

Back-Biased Hall-effect Speed Sensor IC

NOTICE

Observe the following precautions when using magnetometers in general: • 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 such as copper brass, gold, aluminum, some stainless steel, silver, tin silicon, and any nonmetallic material will not distort the field measurements.

• The presence of the earth’s magnetic filed must be taken into account when measuring the x, y, z fields and it varies considerably in different parts of the world. Differences in the earth’s magnetic filed are quite dramatic 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.

Issue A

32346701

TYPICAL OPERATION

Figure 2 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 mini mum 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 3).

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 2. High Level Circuit Block Diagram Voltage regulator Clock Control logic Power on reset Minimum signal lockout peak/valley reset/preload Dual Hall-effect elements Amplifier Internal peak track and hold Comparator Output control Short circuit protected output Internal valley track and hold

Sensing and Internet of Things

3

VG481V1

Back-Biased Hall-effect Speed Sensor IC

Figure 3. High Level Operation

2800 2600 2400 2200

Time

1.6

1.5

1.4

1.3

Time

1 0.5

0

Time

Issue A

32346701

Magnetic signal Amplifier output Peak Valley Slice Output

INTERNAL TRACK AND HOLD OPERATION (See Figures 4, 5)

The input voltage is constantly compared to the voltage held at the output of the peak hold circuit. Whenever the input is higher than the peak hold value, the comparator triggers the counter to increment. This continues until the input value no longer exceeds the peak hold value.

Figure 4. Internal Peak Track and Hold Block Diagram

The internal valley track and hold circuit works identically, except in the opposite direction. The peak hold and valley hold outputs are averaged to produce the slicing level.

In Comparator Up counter Peak hold circuit Out

4

Sensing and Internet of Things

VG481V1

Back-Biased Hall-effect Speed Sensor IC

Figure 5. Internal Peak Sample and Hold Operation

Issue A

32346701

Time

Comparator output/ counter clock

Time

Counter output/ peak hold input

Time POWER ON RESET

At power up, and any time the supply voltage drops below a level that allows reliable operation, the sensor IC ceases operation and will not provide an output until the supply voltage rises to a proper level. The output will be high until the power on reset releases, and it will remain high until the first valid high-to-low transition.

STARTUP SEQUENCE

Sensor IC startup consists of three stages: 1.

Power on reset circuit release:

This occurs once sufficient stable operating voltage is applied.

2.

Internal peak and valley track and hold circuits begin to fully track the input signal:

This is typically less than 1 ms.

3.

Minimum signal lockout release:

This occurs when the peak to-valley difference is greater than 38.5 Gauss.

MINIMUM SIGNAL LOCKOUT

Sensor IC output is enabled when the peak-to-valley difference is greater than 38.5 Gauss typical. When the peak-to-valley difference degrades to less than 27.5 Gauss typical, the sensor IC output is disabled.

After the three startup stages, the sensor IC output will switch normally.

Sensing and Internet of Things

5

VG481V1

Back-Biased Hall-effect Speed Sensor IC

Figure 6. Minimum Circuit for Operation

Issue A

32346701

Figure 7. Typical Output Signal Relative to Mechanical Target

C bypass 220 nF min.

Second level sensor

V supply

IC

Output Ground

Controller interface

V+ R pullup V out

Mechanical target Magnetic signal Sensor output Figure 8. Package Dimensions (For reference only: mm/[in])

4,06 1,57 0,76 2,50 Sensor IC 1,52 3X 0,56 Max.

0,46 3,00 Note: Ensure the minimum hole size in the PCB is 0,68 mm [0.027] dia. based on the IPC 2222 Level B standard.

15,5 - 14,4 3X 0,38

6

Sensing and Internet of Things 2X 1,27 3X 0,38

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.

Warranty/Remedy

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 acknowledgement 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.

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.

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.

For more information

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 Europe USA/Canada +65 6355-2828 +44 (0) 1698 481481 +1-800-537-6945

Honeywell Sensing and Internet of Things

9680 Old Bailes Road Fort Mill, SC 29707 www. honeywell.com

32346701-A-EN | A | 06/19 © 2019 Honeywell International Inc.

Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement