ATS616 Allegro MicroSystems, Inc., ATS616 Datasheet

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ATS616

Manufacturer Part Number
ATS616
Description
Dynamic Self-calibrating Peak-detecting Differential Hall Effect Gear Tooth Sensor
Manufacturer
Allegro MicroSystems, Inc.
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATS616LSGTN-T
Manufacturer:
Allegro
Quantity:
1 800
Part Number:
ATS616LSGTN-T
Manufacturer:
PANASONIC
Quantity:
15
ATS616LSG-DS, Rev. 1
Supply Voltage, V
Reverse-Supply Voltage, V
Output Off Voltage, V
Continuous Output Current, I
Reverse-Output Current, I
Operating Temperature
Storage Temperature, T
*See Power Derating section.
Ambient, T
Maximum Junction, T
AB SO LUTE MAX I MUM RAT INGS
1. VCC
2. VOUT
3. Test Pin (Tie to GND)
4. GND
Package SG, 4-pin SIP
A
, Range L................ –40ºC to 150ºC
CC
1
..................................... 26.5 V*
OUTOFF
2 3
S
.................. –65ºC to 170ºC
4
J(max)
ROUT
RCC
OUT
............................ 24 V
........................ –18 V
.......................50 mA
........................165ºC
Dynamic Self-Calibrating Peak-Detecting Differential
...................25 mA
ATS616LSG
The ATS616 gear-tooth sensor is a peak-detecting device that uses automatic gain
control and an integrated capacitor to provide extremely accurate gear edge detec-
tion down to low operating speeds. Each sensor module consists of a high-tem-
perature plastic shell that holds together a samarium-cobalt magnet, a pole piece,
and a differential open-collector Hall IC that has been optimized to the magnetic
circuit. This small package can be easily assembled and used in conjunction with a
wide variety of gear shapes and sizes.
The gear-sensing technology used for this sensor module is Hall-effect based. The
sensor incorporates a dual-element Hall IC that switches in response to differential
magnetic signals created by ferrous targets. The sophisticated processing circuitry
contains an A-to-D converter that self-calibrates (normalizes) the internal gain
of the device to minimize the effect of air-gap variations. The patented peak-
detecting filter circuit eliminates magnet and system offsets and has the ability to
discriminate relatively fast changes such as those caused by tilt, gear wobble, and
eccentricities. This easy-to-integrate solution provides first-tooth detection and
stable operation to extremely low rpm. The ATS616 can be used as a replacement
for the ATS612LSB, eliminating the external peak-holding capacitor needed by
the ATS612LSB.
The ATS616 is ideal for use in systems that gather speed, position, and timing
information using gear-tooth-based configurations. This device is particularly
suited to those applications that require extremely accurate duty cycle control or
accurate edge-detection, such as automotive camshaft sensing.
TheATS616 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte
tin plated leadframe.
Features and Benefits
• Self-calibrating for tight timing accuracy
• First-tooth detection
• Immunity to air gap variation and system offsets
• Eliminates effects of signature tooth offsets
• Integrated capacitor provides analog peak and valley information
• Extremely low timing-accuracy drift with temperature changes
• Large air gap capability
• Small, integrated package
• Optimized magnetic circuit
• Undervoltage lockout (UVLO)
• Wide operating voltage range
Use the following complete part numbers when ordering:
*Contact Allegro for additional packaging and handling options.
ATS616LSGTN-T
Part Number
Hall Effect Gear Tooth Sensor
4-pin plastic SIP
Package
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
13-in. reel, 800 pieces/reel
Packing*

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ATS616 Summary of contents

Page 1

... This device is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge-detection, such as automotive camshaft sensing. TheATS616 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte tin plated leadframe. Features and Benefits • ...

Page 2

... Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor VCC Voltage Regulator Hall Amp Hall Amp ATS616LSG-DS, Rev. 1 ATS616LSG Functional Block Diagram UVLO Tooth and Valley Comparator Gain Track and Hold Reference Generator Track and Hold GND (Recommended) Power-On Logic VOUT ...

Page 3

... Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section the probe capacitance of the oscilloscope used to make the measurement (millitesla), exactly. 5 Non-uniform magnetic profiles may require additional edges before calibration is complete. ATS616LSG-DS, Rev. 1 ATS616LSG Symbol Test Condition V Operating, T < 165° ...

Page 4

... Valley width, t > • Valley depth, h > • Tooth thickness, F ≥ • Target material must be low carbon steel ATS616LSG-DS, Rev. 1 ATS616LSG Reference Target (Gear) Information Test Conditions Typ. Outside diameter of target 120 Breadth of tooth, with respect 6 ...

Page 5

... T (°C) A Output Voltage (On) versus Ambient Temperature 350 300 250 200 150 100 50 0 – 100 T (°C) A Continued on the next page. ATS616LSG-DS, Rev. 1 ATS616LSG Characteristic Data (° – 150 ...

Page 6

... Sequential Tooth Falling Edge 1000 rpm 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 0.5 1.0 1.5 2.0 AG (mm) Relative Timing Accuracy versus Air Gap Signature Tooth Falling Edge 1000 rpm 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0 0.5 1.0 1.5 2.0 AG (mm) ATS616LSG-DS, Rev. 1 ATS616LSG Characteristic Data (continued) Relative Timing Accuracy versus Air Gap 1.5 1.0 T (°C) A 0.5 – -0.5 125 150 -1.0 -1.5 2.5 3.0 0 Relative Timing Accuracy versus Air Gap 1.5 1.0 T (°C) A 0.5 – ...

Page 7

... T (°C) A Relative Timing Accuracy versus Ambient Temperature Sequential Tooth Rising Edge 0.5 mm 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 – 100 T (°C) A ATS616LSG-DS, Rev. 1 ATS616LSG Characteristic Data (continued) Relative Timing Accuracy versus Ambient Temperature 1.5 1.0 rpm 0.5 10 100 0.0 500 1000 -0.5 1500 2000 -1.0 -1.5 150 200 –50 Relative Timing Accuracy versus Ambient Temperature 1 ...

Page 8

... Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional information is available on the Allegro Web site. ATS616LSG-DS, Rev. 1 ATS616LSG Symbol Test Conditions* Single-sided PCB with copper limited to solder pads R Two-sided PCB with copper limited to solder pads and 3 ...

Page 9

... The peak detection concept also allows extremely low speed operation for small value filter capacitors. The ATS616 also includes self-calibration circuitry that is engaged at power on. The signal amplitude is measured, and then the device gain is normalized. In this manner switchpoint drift versus air gap is minimized, and excellent timing accuracy can be achieved ...

Page 10

... Superior Performance. gear-tooth sensor module has several advantages over conven- tional Hall-effect gear-tooth sensors. The signal-processing techniques used in the ATS616 solve the catastrophic issues that affect the functionality of conventional digital gear-tooth sen- sors, such as the following: • Temperature drift. Changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry ...

Page 11

... OUT Target Motion from Pin 4 to Pin 1 Figure 7. The magnetic profile reflects the geometry of the target, allowing the device to present an accurate digital output response. ATS616LSG-DS, Rev. 1 ATS616LSG High-pass filtering is below the minimum operating voltage, V off and stays off, irrespective of the state of the magnetic field. ...

Page 12

... R A θJA V CC(max) This value applies only to the voltage drop across the ATS616 chip protective series diode or resistor is used, the effec- tive maximum supply voltage is increased. For example, when a standard diode with a 0.7 V drop is used: , represents the maximum allow- D(max) ...

Page 13

... Temperature excursions 225°C for 2 minutes or less are permitted. b Industry accepted soldering techniques are acceptable for this package as long as the indicated maximum temperature is not exceeded. Additional soldering information is available on the Allegro Web site. ATS616LSG-DS, Rev. 1 ATS616LSG Characterization Only Test Name* ...

Page 14

... The in for ma tion in clud ed herein is believed rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. Copyright © 2005 Allegro MicroSystems, Inc. ATS616LSG-DS, Rev. 1 ATS616LSG Package SG Module ...

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