http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf





Allegro MicroSystems
Allegro MicroSystems

ATS645LSH Datasheet Preview

ATS645LSH Datasheet

True Zero Speed Miniature Gear Tooth Sensor

No Preview Available !

ATS645LSH pdf
www.DataSheet4U.com
ATS645LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor
Features and Benefits
• Fully optimized differential digital gear tooth sensor
• Single chip IC for high reliability
• Internal current regulator for 2-wire operation
• Small mechanical size (8 mm diameter x 5.5 mm depth)
• Air gap independent switchpoints
• Digital output representing gear profile
• Precise duty cycle signal over operating temperature
range
• Large operating air gaps
• Automatic Gain Control (AGC)
Continued on the next page…
Packages: 4 pin SIP (suffix SH)
Description
The components in speed sensing applications continue to
diminish in size to meet spatial constraints and weight reduction
requirements. As the geometries of gears become smaller, this
can compromise the capabilities of a gear speed sensor. The
ATS645 Hall-element-to-Hall-element spacing of only 1.5 mm
makes this device uniquely capable of accommodating very
fine-pitch gears. In addition, theATS645 signal peak-detecting
algorithm supports consistent switching at relatively large air
gaps, where the peak-to-peak amplitude is small.These features
make the ATS645 the ideal solution to detect the speed of fine-
pitch targets such as those found in ABS (antilock braking)
systems.
The ATS645 combines a Hall-effect sensing integrated circuit
and magnet to provide a manufacturer-friendly solution for true
zero-speed digital gear-tooth sensing in two-wire applications.
The device consists of a single-shot molded plastic package
that includes a samarium cobalt magnet, a pole piece, and a
Hall-effect integrated circuit 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.
Not to scale
Continued on the next page…
Functional Block Diagram
Hall
Amplifier
Automatic Offset
Control
AOA DAC
Tracking
DAC
Peak Hold
Gain
AGC DAC
Internal Regulator
Test Signals
VCC
GND
Test
ATS645-DS, Rev. 3



Allegro MicroSystems
Allegro MicroSystems

ATS645LSH Datasheet Preview

ATS645LSH Datasheet

True Zero Speed Miniature Gear Tooth Sensor

No Preview Available !

ATS645LSH pdf
ATS645LSH
True Zero Speed Miniature Differential Peak-
Detecting Gear Tooth Sensor
Features and Benefits (continued)
• Automatic Offset Adjustment (AOA)
• True zero-speed operation
• Undervoltage lockout
• Wide operating voltage range
• Defined power-on state
Description (continued)
The integrated circuit incorporates a dual-element Hall effect sensor
as well as signal processing that switches the output state in response
to changes in the magnetic gradients created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit to eliminate
magnet and system offsets and to achieve true zero speed operation
(U.S. Patent 5,917,320). A-D and D-A converters are used to adjust
the device gain at power-on and to allow switching independent of
the breadth of the air gap.
The regulated current output is configured for two wire applications,
requiring one less wire for operation than do switches with the more
traditional open-collector output.The package is available in a lead
(Pb) free version, with 100% matte tin leadframe plating.
Part Number
Pb-free1
ATS645LSHTN-I1-T
Yes
Packing2
Tape and Reel 13-in. 800 pcs./reel
ICC Typical
6.0 Low to 14.0 High mA
ATS645LSHTN-I2-T
Yes
Tape and Reel 13-in. 800 pcs./reel
7.0 Low to 14.0 High mA
1Pb-based variants are being phased out of the product line.
a. Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale
of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because
obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST
TIME BUY ORDERS: April 27, 2007. These variants include: ATS645LSHTN-I1.
b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This
classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be
purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.
Status change: May 1, 2006. These variants include: ATS645LSHTN-I2.
2Contact Allegro for additional packing options.
3Some restrictions may apply to certain types of sales. Contact Allegro for details.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse-Supply Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Pin-out Diagram
1234
Symbol
VCC
VRCC
TA
TJ(max)
Tstg
Range L
Notes
Terminal List
Name
VCC
Description
Connects power supply to chip
NC No connection
TEST
For Allegro use, oat or tie to GND
GND
Ground terminal
Rating
28
–18
–40 to 150
165
–65 to 170
Units
V
ºC
ºC
ºC
Number
1
2
3
4
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number ATS645LSH
Description True Zero Speed Miniature Gear Tooth Sensor
Maker Allegro MicroSystems
Total Page 14 Pages
PDF Download
ATS645LSH pdf
Download PDF File
[partsNo] view html
View PDF for Mobile






Related Datasheet

1 ATS645LSH True Zero Speed Miniature Gear Tooth Sensor Allegro MicroSystems
Allegro MicroSystems
ATS645LSH pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components