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 Sensing and Internet of Things 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 Sensing and Internet of Things 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 Sensing and Internet of Things 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. Sensing and Internet of Things 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) Sensing and Internet of Things 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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