ATS651LSH_05 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity

ATS651LSH
Two-Wire Self-Calibrating Differential
Speed and Direction Sensor with Vibration Immunity
Package SH
1234
1. VCC
2. TESTA pin, Channel A
3. TESTB pin, Channel B
4. GND
ABSOLUTE MAXIMUM RATINGS
Supply Voltage*, V_CC......................................... 28 V
Reverse-Supply Voltage, V_RCC ........................ –18 V
Reverse-Output Voltage, V_ROUT...................... –0.5 V
Temperatures
OperatingAmbient, T_A................. –40ºC to 150ºC
Junction, T_J(MAX) .......................................165ºC
Storage, T_S ................................. –65ºC to 170ºC
*Refer to Power Derating section
651LSH-DS, Rev. 3
The ATS651LSH is a mechatronics component with an integrated Hall-effect
sensor and magnet, providing an easy-to-use solution for speed and direction sens-
ing applications. The solid thermoset molded plastic package contains a samarium
cobalt magnet and a Hall-effect IC optimized to the magnetic circuit. This sensor
module has been designed specifically for high reliability in the harsh automo-
tive environment. The IC employs patented algorithms for the special operational
requirements of transmission applications.
This two-wire device communicates the speed and direction of a ferrous target
via a pulse width modulation (PWM) output protocol. The innovative dual differ-
ential detector scheme uses three Hall elements and two separate signal processing
channels. This provides greater reliability than conventional designs. Because only
one of the channels controls switching, the same edge of each tooth is used for
determining output signals, in both forward and reverse target rotation, with direc-
tion information available on the first magnetic edge after a direction change.
The ATS651LSH is particularly adept at handling vibration without sacrific-
ing maximum air gap capability or creating an erroneous “direction” pulse. Even
the higher angular vibration caused by engine cranking is completely rejected by
the device. The advanced vibration detection algorithms systematically calibrate
the sensor on the true rotation signals from the first three and a half teeth, not on
vibration, thus always guaranteeing an accurate signal in running mode.
Patented running mode algorithms also protect against air gap changes, whether
or not the target is in motion. Advanced signal processing and innovative algo-
rithms make the ATS651LSH an ideal solution for a wide range of speed and
direction sensing needs.
The device package is lead (Pb) free, with 100% matte tin plated leadframe.
Features and Benefits
• Rotational direction detection
• Fully optimized digital differential gear-tooth sensor
• Single-chip sensing IC for high reliability
• Small mechanical size (8 mm diameter × 5.5 mm vertical, flat-to-flat)
• Internal current regulator for 2-wire operation
• Automatic Gain Control (AGC) and reference adjust circuit
• 3-bit factory trimmed for tight pulse width accuracy
• True zero-speed operation
• Wide operating voltage range
• Undervoltage lockout
• Defined power-on state
• ESD and reverse polarity protection
Use the following complete part numbers when ordering:
Part Number
Packing*
ATS651LSHTN-T
13-in. reel, 800 pieces/reel
*Contact Allegro for additional packing options.
Some restrictions may apply to certain types of sales.
Contact Allegro for details.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com