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PDF ATS612JSB Data sheet ( Hoja de datos )
| Número de pieza | ATS612JSB | |
| Descripción | DYNAMIC/ SELF-CALIBRATING/ PEAK-DETECTING/ DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR | |
| Fabricantes | Allegro MicroSystems | |
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ATS612JSB
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
ATS612JSBDIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR
PRELIMINARY INFORMATION
(subject to change without notice)
November 20, 1998
1
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Capacitor
Pin 4 = Ground
Dwg. AH-006
ABSOLUTE MAXIMUM RATINGS
over operating temperature range
Supply Voltage, VCC ............................... 24 V*
Reverse Supply Voltage, VRCC .............. -16 V
Output OFF Voltage, VOUT ....................... 24 V
Continuous Output Current,
IOUT ............................ Internally Limited
Reverse Output Current, IROUT ............ 50 mA
Package Power Dissipation,
PD .......................................... See Graph
Operating Temperature Range,
TA ................................. -40°C to +115°C*
Storage Temperature, TS .................. +170°C
* Operation at increased supply voltages with
external circuitry is described in Applications
Information. Devices for operation at increased
temperatures are available on special order.
DYNAMIC, SELF-CALIBRATING,
PEAK-DETECTING, DIFFERENTIAL
HALL-EFFECT GEAR-TOOTH SENSOR
The ATS612JSB dynamically-coupled gear tooth sensor is a peak
detecting device that uses gain control to provide extremely accurate
gear edge detection down to low operating speeds. Each sensor
subassembly consists of a high-temperature plastic shell that holds
together a samarium-cobalt magnet, a pole piece, and a dynamically-
coupled 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 subassembly 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 a self-calibrat-
ing 5-bit A/D converter that 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 yet provides stable operation to extremely
low RPMs.
These sensor systems are ideal for use in gathering speed, posi-
tion, and timing information using gear-tooth-based configurations. The
ATS612JSB is particularly suited to those applications that require
extremely accurate duty cycle control or accurate edge detection similar
to crank shaft applications. The lower vibration sensitivity also makes
this device extremely useful for transmission speed sensing.
ATS612JSB: Large- or small-tooth gear-position sensing —
crank angle, transmission speed, cam angle.
continued next page…
Always order by complete part number: ATS612JSB .
1 page  
ATS612JSB
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR
TYPICAL ELECTRICAL CHARACTERISTICS
14
12
11
10
9.0
8.0
7.0
6.0
4.0
-40
OUTPUT ON
OUTPUT OFF
VCC = 8 V
0 40 80 120
AMBIENT TEMPERATURE IN °C
160 200
Dwg. GH-014-2
13
12
11
OUTPUT ON
10
9.0
8.0 OUTPUT OFF
7.0
6.0
5.0
2.0
TA = 25°C
6.0 10 14
SUPPLY VOLTAGE IN VOLTS
18
Dwg. GH-058-1
275
250 IOUT = 20 mA
225
200
175
150
-40
0 40 80 120
AMBIENT TEMPERATURE IN °C
160 200
Dwg. GH-013-2
5 Page 
ATS612JSB
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To
become qualified, except for the destructive ESD tests, no failures are permitted.
Qualification Test
Test Method and
Test Conditions
Test Length
Samples
Per Lot
Comments
Temperature Humidity JESD22-A101,
Bias Life
TA = 85°C, RH = 85%
1000 hrs
77 Device biased for
minimum power
Bias Life
(Surge Operating Life)
JESD22-A108,
TA = 150°C, TJ = 165°C
JESD22-A108,
TA = 175°C, TJ = 190°C
1000 hrs
168 hrs
77
77
Autoclave, Unbiased JESD22-A102,
TA = 121°C, 15 psig
96 hrs
77
High-Temperature
(Bake) Storage Life
Temperature Cycle
JESD22-A103,
TA = 170°C
JESD22-A104
1000 hrs
1000 cycles
77
77
-55°C to +150°C
ESD,
Human Body Model
CDF-AEC-Q100-002
Pre/Post
Reading
3 per
test
Test to failure
Pin 3 > 1.5 kV
All other pins > 3 kV
GEAR/TARGET SYSTEM EVALUATION*
An analog map of the magnetic signal can be
obtained by measuring the voltage at pin 3 (the capacitor
pin) while the device is running. The peak and valley hold
voltage will represent the peak-to-peak value of the signal.
More accurate measurements can be taken by connecting
an extremely small capacitor (0.05 µF) from pin 3 to
ground. After the device is powered up and has switched
at least 64 times, a 1 kΩ bleed-off resistor should be
installed in parallel with the capacitor without powering
down the device. If the gear is then rotated at an ex-
tremely low speed, an analog representation of the gain-
adjusted signal can be measured at pin 3. Note that the
device should be re-powered at each air gap and the
above procedure repeated for accurate measurements. In
both cases, the analog signal may be compared to the
typical hysteresis of the device and device performance
can be estimated.
* In application, the terms “gear” and “target” are often
interchanged. However, “gear” is preferred when motion
is transferred.
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ATS612JSB.PDF ] | |
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