ATS642LSH Datasheet, PDF (1/16 Pages) Allegro MicroSystems – Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration

ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
Package SH, 4-pin Module
1234
1. VCC
2. No connection
3. Test pin (float or tie to GND)
4. GND
The ATS642LSH is an optimized Hall effect sensing integrated circuit and magnet
combination that provides a user-friendly solution for true zero-speed digital
gear-tooth sensing in two-wire applications. The sensor consists of a single-shot
molded plastic package that includes a samarium cobalt magnet, a pole piece,
and a Hall effect IC that has been optimized to the magnetic circuit. This small
package, with optimized two-wire leadframe, can be easily assembled and used in
conjunction with a wide variety of gear shapes and sizes.
The integrated circuit incorporates a dual element Hall effect sensor and signal
processing that switches in response to differential magnetic signals created
by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to
reduce magnet and system offsets, to calibrate the gain for air gap independent
switchpoints, and to achieve true zero-speed operation. Signal optimization occurs
at power-up through the combination of offset and gain adjust and is maintained
throughout the operating time with the use of a running mode calibration. The run-
ning mode calibration allows immunity to environmental effects such as microos-
cillations of the target or sudden air gap changes.
The regulated current output is configured for two wire applications and the
sensor is ideally suited for obtaining speed and duty cycle information in ABS
(antilock braking systems). The 1.5 mm Hall element spacing is optimized for fine
pitch gear-tooth-based configurations. The package is lead (Pb) free, with 100%
matte tin leadframe plating.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V_CC .......................................... 28 V
Reverse-Supply Voltage, V_RCC ........................ –18 V
Operating Temperature
Ambient, T_A,............................... –40ºC to 150ºC
Maximum Junction, T_J(max)........................165ºC
Storage Temperature, T_S .................. –65ºC to 170ºC
Features and Benefits
• Running mode calibration for continu-
ous optimization
• Single chip IC for high reliability
• Internal current regulator for 2-wire
operation
• Small mechanical size (8 mm
diameter x 5.5 mm depth)
• Precise duty cycle signal over
operating temperature range
• Large operating air gaps
• Automatic Gain Control (AGC) for air
gap independent switchpoints
• Automatic Offset Adjustment (AOA)
for signal processing optimization
• True zero-speed operation
• Undervoltage lockout
• Wide operating voltage range
ATS642LSH-DS
Use the following complete part numbers when ordering:
Part Number
ATS642LSHTN-I1-T
I_CC Typical
6.0 Low to 14.0 High mA
ATS642LSHTN-I2-T
7.0 Low to 14.0 High mA
*Contact Allegro for additional packing options.
Packing*
Tape and reel,
13-inch reel
800 pieces/reel
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com