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PDF ATS651LSH Data sheet ( Hoja de datos )
| Número de pieza | ATS651LSH | |
| Descripción | Two-Wire Self-Calibrating Differential Speed and Direction Sensor | |
| Fabricantes | Allegro MicroSystems | |
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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*, VCC......................................... 28 V
Reverse-Supply Voltage, VRCC ........................ –18 V
Reverse-Output Voltage, VROUT...................... –0.5 V
Temperatures
OperatingAmbient, TA................. –40ºC to 150ºC
Junction, TJ(MAX) .......................................165ºC
Storage, TS ................................. –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
vibrationw,wtwh.DuatsaSahelewt4Ua.cyoms 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 (508) 853-5000
www.allegromicro.com
1 page  
ATS651LSH
Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity
Device Characteristics Tables (Continued)
Protocol Pulse Characteristics Valid for –40°C ≤ TA ≤ 150°C (TJ ≤ 165°C), unless otherwise noted
Characteristics
Symbol
Test Conditions
Min. Typ. Max. Units
Minimum Low-State Duration*
tLD Falling edge to subsequent rising edge.
10 –
– μs
Pulse Width Forward Rotation
tW(fwd)
38 45 52 μs
Pulse Width Reverse Rotation
tW(rev)
76 90 104 μs
Protocol Pulse Width Tolerance
EPPW
Reference Target
–15 – 15 %
*Maximum Operating Frequency may be increased if the application controller can resolve Minimum Low-State Duration levels down to the specified
value.
651LSH-DS, Rev. 3
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
ATS651LSH
Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity
Power Derating
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
×PD = VIN IIN
(1)
ΔT = PD × RθJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 5 V, ICC = 14 mA, and RθJA = 126 °C/W, then:
PD = VCC × ICC = 12 V × 4.0 mA = 70.0 mW
ΔT = PD × RθJA = 70.0 mW × 126 °C/W = 8.8°C
TJ = TA + ΔT = 25°C + 8.8°C = 23.8°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RθJA and TA.
Example: Reliability for VCC at TA=150°C, package SH, using
the PCB with least exposed copper.
Observe the worst-case ratings for the device, specifically:
RθJA= 126°C/W, TJ(max) = 165°C, VCC(max) = 28V, and
ICC(max) = 16.8 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
ΔTmax = TJ(max) – TA = 165 °C – 150 °C = 15 °C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 126 °C/W = 119 mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 119 mW ÷ 16.8 mA = 7.1 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
This value applies only to the voltage drop across the
ATS651LSH chip. If a protective series diode or resistor is used,
the effective maximum supply voltage is increased.
For example, when a standard diode with a 0.7 V drop is used:
VS(max) = 7.1 V + 0.7 V = 7.8 V
651LSH-DS, Rev. 3
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ATS651LSH.PDF ] | |
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