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PDF ATS616LSG Data sheet ( Hoja de datos )
| Número de pieza | ATS616LSG | |
| Descripción | Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor | |
| Fabricantes | Allegro MicroSystems | |
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ATS616LSG
www.datasheet4u.com
Dynamic Self-Calibrating Peak-Detecting Differential
Hall Effect Gear Tooth Sensor
Package SG, 4-pin SIP
1234
1. VCC
2. VOUT
3. Test Pin (Tie to GND)
4. GND
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.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ..................................... 26.5 V*
Reverse-Supply Voltage, VRCC ........................ –18 V
Output Off Voltage, VOUTOFF ............................ 24 V
Continuous Output Current, IOUT ...................25 mA
Reverse-Output Current, IROUT.......................50 mA
Operating Temperature
Ambient, TA, Range L................ –40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS .................. –65ºC to 170ºC
*See Power Derating section.
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:
Part Number
Package
Packing*
ATS616LSGTN-T
4-pin plastic SIP
13-in. reel, 800 pieces/reel
*Contact Allegro for additional packaging and handling options.
ATS616LSG-DS, Rev. 1
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
1 page  
ATS616LSG
Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor
www.datasheet4u.com
Characteristic Data
Supply Current (Off) versus Supply Voltage
Supply Current (On) versus Supply Voltage
9
8
7
6 TA (°C)
5 –40
4 25
3 85
2 150
1
0
0 5 10 15 20 25 30
VCC (V)
9
8
7
6 TA (°C)
5 –40
4 25
3 85
2 150
1
0
0 5 10 15 20 25 30
VCC (V)
Supply Current (Off) versus Ambient Temperature
Supply Current (On) versus Ambient Temperature
9
8
7
6
5
4
3
2
1
0
–50 0
VCC (V)
3.5
5.0
12
24
50 100 150 200
TA (°C)
Output Voltage (On) versus Ambient Temperature
350
300
250
200
150
100
50
0
–50
0
ISINK(mA)
20
50 100 150 200
TA (°C)
Continued on the next page.
ATS616LSG-DS, Rev. 1
9
8
7
6
5
4
3
2
1
0
–50 0
VCC (V)
3.5
5.0
12
24
50 100 150 200
TA (°C)
Output Leakage Current versus Ambient Temperature
1.2
1.0
0.8
VOUT (V)
0.6 10
0.4
0.2
0
–50 0
50 100 150 200
TA (°C)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
ATS616LSG
Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor
Peak Detecting vs. AC-Coupled Filters. High-pass filtering
(normal ac coupling) is a commonly used technique for eliminat-
ing circuit offsets. However, ac coupling has errors at power-on
wwbwec.daautsaeshteheet4fuil.tceormcircuit needs to hold the circuit zero value
even though the circuit may power-on over a large signal. Such
filtering techniques can only perform properly after the filter
has been allowed to settle, which typically takes longer than 1s.
Also, high-pass filter solutions cannot easily track rapidly chang-
ing baselines, such as those caused by eccentricities. (The term
baseline refers to a 0 G differential field, where each Hall-effect
element is subject to the same magnetic field strength; see figure
3.) In contrast, peak detecting designs switch at the change in
slope of the differential signal, and so are baseline-independent
both at power-on and while running.
Peak Detecting vs. Zero-Crossing Reference. The usual dif-
ferential zero-crossing sensors are susceptible to false switching
due to off-center and tilted installations that result in a shift of
the baseline that changes with air gap. The track-and-hold peak
detection technique ignores baseline shifts versus air gaps and
provides increased immunity to false switching. In addition,
using track-and-hold peak detection techniques, increased air
gap capabilities can be expected because peak detection utilizes
the entire peak-to-peak signal range, as compared to zero-cross-
ing detectors, which switch at half the peak-to-peak signal.
Power-On Operation. The device powers-on in the Off state
(output voltage high), irrespective of the magnetic field condi-
tion. The power-up time of the circuit is no greater than 500 μs.
The circuit is then ready to accurately detect the first target edge
that results in a high-to-low transition of the device output.
Undervoltage Lockout (UVLO). When the supply voltage, VCC ,
is below the minimum operating voltage, VCC(UV) , the device is
off and stays off, irrespective of the state of the magnetic field.
This prevents false signals, which may be caused by undervolt-
age conditions (especially during power-up), from appearing at
the output.
Output. The device output is an open-collector stage capable of
sinking up to 20 mA. An external pull-up (resistor) must be sup-
plied to a supply voltage of not more than 24 V.
Output Polarity. The output of the unit will switch from low to
high as the leading edge of a tooth passes the branded face of the
sensor in the direction indicated in figure 6. This means that in
such a configuration, the output voltage will be high when the
sensor is facing a tooth. If the target rotation is in the oppo-
site direction relative to the sensor, the output polarity will be
opposite as well, with the unit switching from low to high as the
leading edge passes the unit.
Rotating Target
Branded Face
of Sensor
14
Figure 6. This left-to-right (pin 1 to pin 4) direction of target rotation
results in a high output signal when a tooth of the target gear is nearest
the branded face of the sensor. A right-to-left (pin 4 to pin 1) rotation
inverts the output signal polarity.
Target
Mechanical Profile
Target
Magnetic Profile
B+
BIN
Signature Tooth
Sensor Output
Switch State
On Off On Off On Off On Off On
Off
On Off On Off On Off
Sensor Output
Electrical Profile
Target Motion from
Pin 1 to Pin 4
Sensor Output
Electrical Profile
Target Motion from
Pin 4 to Pin 1
V+
VOUT
V+
VOUT
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
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ATS616LSG.PDF ] | |
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